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[CVE-2017-12883]Buffer over-read in S_grok_bslash_N · Issue #16025 · Perl/perl5 · GitHub
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href=\"https://rt-archive.perl.org/perl5/Ticket/Display.html?id=131598\" rel=\"nofollow\"\u003ert.perl.org#131598\u003c/a\u003e (status was 'resolved')\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eSearchable as RT131598$\u003c/p\u003e","bodyVersion":"b146a167e3b9242b154cebaee44b67c4241d316402f5158419773028006feacf","createdAt":"2017-06-18T15:53:27Z","__isReactable":"Issue","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"viewerCanUpdateMetadata":false,"viewerCanComment":false,"viewerCanAssign":false,"viewerCanLabel":false,"__isIssueOrPullRequest":"Issue","projectItemsNext":{"edges":[],"pageInfo":{"endCursor":null,"hasNextPage":false}},"viewerCanSetMilestone":false,"isPinned":false,"viewerCanDelete":false,"viewerCanTransfer":false,"viewerCanConvertToDiscussion":false,"viewerCanLock":false,"viewerCanType":false,"frontTimelineItems":{"pageInfo":{"hasNextPage":true,"endCursor":"Y3Vyc29yOnYyOpPPAAABXdP0sRgAqTU0NDA4OTcyMg=="},"totalCount":31,"edges":[{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":544089705,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"p5pRT","id":"MDQ6VXNlcjUxNzk4MDE4"},"id":"MDU6SXNzdWU1MDkzOTE2NTE=","number":16025,"locked":false,"databaseId":509391651},"author":{"__typename":"User","login":"p5pRT","avatarUrl":"https://avatars.githubusercontent.com/u/51798018?u=c0c9dec90db4d6102e88553f891e56b4bb45370e\u0026v=4","id":"MDQ6VXNlcjUxNzk4MDE4"},"id":"MDEyOklzc3VlQ29tbWVudDU0NDA4OTcwNQ==","body":"### From @jwilk\n\nConsider the following program\u0026#8203;:\n\nm'\\\\N\\{U\\+\\.\\}';\n\\_\\_END\\_\\_\n\nWhen you run it under valgrind\\, you get\u0026#8203;:\n\n\u0026nbsp; Invalid read of size 2\n\u0026nbsp; at 0x402E020\u0026#8203;: memcpy \\(in /usr/lib/valgrind/vgpreload\\_memcheck\\-x86\\-linux\\.so\\)\n\u0026nbsp; by 0x815243E\u0026#8203;: Perl\\_sv\\_vcatpvfn\\_flags \\(sv\\.c\u0026#8203;:13067\\)\n\u0026nbsp; by 0x814D860\u0026#8203;: Perl\\_sv\\_vsetpvfn \\(sv\\.c\u0026#8203;:10953\\)\n\u0026nbsp; by 0x810985B\u0026#8203;: Perl\\_vmess \\(util\\.c\u0026#8203;:1485\\)\n\u0026nbsp; by 0x8109E4C\u0026#8203;: Perl\\_vcroak \\(util\\.c\u0026#8203;:1714\\)\n\u0026nbsp; by 0x8109EE5\u0026#8203;: Perl\\_croak \\(util\\.c\u0026#8203;:1761\\)\n\u0026nbsp; by 0x80E8FFF\u0026#8203;: S\\_grok\\_bslash\\_N \\(regcomp\\.c\u0026#8203;:12168\\)\n\u0026nbsp; by 0x80EB5B8\u0026#8203;: S\\_regatom \\(regcomp\\.c\u0026#8203;:12880\\)\n\u0026nbsp; by 0x80E6A9D\u0026#8203;: S\\_regpiece \\(regcomp\\.c\u0026#8203;:11669\\)\n\u0026nbsp; by 0x80E6872\u0026#8203;: S\\_regbranch \\(regcomp\\.c\u0026#8203;:11594\\)\n\u0026nbsp; by 0x80E58D4\u0026#8203;: S\\_reg \\(regcomp\\.c\u0026#8203;:11332\\)\n\u0026nbsp; by 0x80D7CCD\u0026#8203;: Perl\\_re\\_op\\_compile \\(regcomp\\.c\u0026#8203;:7101\\)\n\u0026nbsp; Address 0x4288d1e is 6 bytes after a block of size 120 free'd\n\u0026nbsp; at 0x402A3A8\u0026#8203;: free \\(in /usr/lib/valgrind/vgpreload\\_memcheck\\-x86\\-linux\\.so\\)\n\u0026nbsp; by 0x810837B\u0026#8203;: Perl\\_safesysfree \\(util\\.c\u0026#8203;:388\\)\n\u0026nbsp; by 0x816F501\u0026#8203;: Perl\\_leave\\_scope \\(scope\\.c\u0026#8203;:929\\)\n\u0026nbsp; by 0x816DA76\u0026#8203;: Perl\\_pop\\_scope \\(scope\\.c\u0026#8203;:124\\)\n\u0026nbsp; by 0x809BF63\u0026#8203;: S\\_sublex\\_done \\(toke\\.c\u0026#8203;:2569\\)\n\u0026nbsp; by 0x80A1E24\u0026#8203;: Perl\\_yylex \\(toke\\.c\u0026#8203;:4918\\)\n\u0026nbsp; by 0x80BE6A1\u0026#8203;: Perl\\_yyparse \\(perly\\.c\u0026#8203;:340\\)\n\u0026nbsp; by 0x8086637\u0026#8203;: S\\_parse\\_body \\(perl\\.c\u0026#8203;:2377\\)\n\u0026nbsp; by 0x808578B\u0026#8203;: perl\\_parse \\(perl\\.c\u0026#8203;:1692\\)\n\u0026nbsp; by 0x8061751\u0026#8203;: main \\(perlmain\\.c\u0026#8203;:121\\)\n\nThe above was tested on v5\\.26\\.0 built for i686\\-linux\\.\n\nThe exact symptoms seem to vary with Perl version\\. For example\\, when I run it \non Debian perl v5\\.24\\.1 on i386 \\(without valgrind this time\\)\\, I get the \nfollowing warning on stderr\u0026#8203;:\n\n\u0026nbsp; Invalid hexadecimal number in \\\\N\\{U\\+\\.\\.\\.\\} in regex; marked by \\\u003c\\-\\- HERE in m/ \\\u003c\\-\\- HERE \\\u003cbinary garbage\u003e\n\nwhere binary garbage looks like a large chunk of the program memory\\, including \nvalues of environment variables\\. :\\(\n\n\\-\\- \nJakub Wilk","bodyHTML":"\u003ch3 dir=\"auto\"\u003eFrom \u003ca class=\"user-mention notranslate\" data-hovercard-type=\"user\" data-hovercard-url=\"/users/jwilk/hovercard\" data-octo-click=\"hovercard-link-click\" data-octo-dimensions=\"link_type:self\" href=\"https://github.com/jwilk\"\u003e@jwilk\u003c/a\u003e\u003c/h3\u003e\n\u003cp dir=\"auto\"\u003eConsider the following program:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003em'\\N{U+.}';\u003cbr\u003e\n__END__\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWhen you run it under valgrind, you get:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e Invalid read of size 2\u003cbr\u003e\n at 0x402E020: memcpy (in /usr/lib/valgrind/vgpreload_memcheck-x86-linux.so)\u003cbr\u003e\n by 0x815243E: Perl_sv_vcatpvfn_flags (sv.c:13067)\u003cbr\u003e\n by 0x814D860: Perl_sv_vsetpvfn (sv.c:10953)\u003cbr\u003e\n by 0x810985B: Perl_vmess (util.c:1485)\u003cbr\u003e\n by 0x8109E4C: Perl_vcroak (util.c:1714)\u003cbr\u003e\n by 0x8109EE5: Perl_croak (util.c:1761)\u003cbr\u003e\n by 0x80E8FFF: S_grok_bslash_N (regcomp.c:12168)\u003cbr\u003e\n by 0x80EB5B8: S_regatom (regcomp.c:12880)\u003cbr\u003e\n by 0x80E6A9D: S_regpiece (regcomp.c:11669)\u003cbr\u003e\n by 0x80E6872: S_regbranch (regcomp.c:11594)\u003cbr\u003e\n by 0x80E58D4: S_reg (regcomp.c:11332)\u003cbr\u003e\n by 0x80D7CCD: Perl_re_op_compile (regcomp.c:7101)\u003cbr\u003e\n Address 0x4288d1e is 6 bytes after a block of size 120 free'd\u003cbr\u003e\n at 0x402A3A8: free (in /usr/lib/valgrind/vgpreload_memcheck-x86-linux.so)\u003cbr\u003e\n by 0x810837B: Perl_safesysfree (util.c:388)\u003cbr\u003e\n by 0x816F501: Perl_leave_scope (scope.c:929)\u003cbr\u003e\n by 0x816DA76: Perl_pop_scope (scope.c:124)\u003cbr\u003e\n by 0x809BF63: S_sublex_done (toke.c:2569)\u003cbr\u003e\n by 0x80A1E24: Perl_yylex (toke.c:4918)\u003cbr\u003e\n by 0x80BE6A1: Perl_yyparse (perly.c:340)\u003cbr\u003e\n by 0x8086637: S_parse_body (perl.c:2377)\u003cbr\u003e\n by 0x808578B: perl_parse (perl.c:1692)\u003cbr\u003e\n by 0x8061751: main (perlmain.c:121)\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe above was tested on v5.26.0 built for i686-linux.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe exact symptoms seem to vary with Perl version. For example, when I run it\u003cbr\u003e\non Debian perl v5.24.1 on i386 (without valgrind this time), I get the\u003cbr\u003e\nfollowing warning on stderr:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e Invalid hexadecimal number in \\N{U+...} in regex; marked by \u0026lt;-- HERE in m/ \u0026lt;-- HERE \u0026lt;binary garbage\u0026gt;\u003c/p\u003e\n\u003cp dir=\"auto\"\u003ewhere binary garbage looks like a large chunk of the program memory, including\u003cbr\u003e\nvalues of environment variables. :(\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e--\u003cbr\u003e\nJakub Wilk\u003c/p\u003e","bodyVersion":"1ff3c3bc6ea26f9327df0f72797f41d777f1985a227231501734608f4eb796a8","viewerCanUpdate":false,"url":"https://github.com/Perl/perl5/issues/16025#issuecomment-544089705","createdAt":"2017-06-18T15:53:27Z","authorAssociation":"NONE","viewerCanDelete":false,"viewerCanMinimize":false,"viewerCanReport":false,"viewerCanReportToMaintainer":false,"viewerCanBlockFromOrg":false,"viewerCanUnblockFromOrg":false,"isHidden":false,"minimizedReason":null,"showSpammyBadge":false,"createdViaEmail":false,"authorToRepoOwnerSponsorship":null,"repository":{"id":"MDEwOlJlcG9zaXRvcnk4MTgzNTcw","name":"perl5","owner":{"__typename":"Organization","id":"MDEyOk9yZ2FuaXphdGlvbjM1ODU0MTE=","login":"Perl","url":"https://github.com/Perl"},"isPrivate":false,"slashCommandsEnabled":false,"nameWithOwner":"Perl/perl5","databaseId":8183570},"__isComment":"IssueComment","viewerCanReadUserContentEdits":true,"lastEditedAt":null,"lastUserContentEdit":null,"__isReactable":"IssueComment","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"__isNode":"IssueComment"},"cursor":"Y3Vyc29yOnYyOpPPAAABXLvorNgAqTU0NDA4OTcwNQ=="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":544089706,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"p5pRT","id":"MDQ6VXNlcjUxNzk4MDE4"},"id":"MDU6SXNzdWU1MDkzOTE2NTE=","number":16025,"locked":false,"databaseId":509391651},"author":{"__typename":"User","login":"p5pRT","avatarUrl":"https://avatars.githubusercontent.com/u/51798018?u=c0c9dec90db4d6102e88553f891e56b4bb45370e\u0026v=4","id":"MDQ6VXNlcjUxNzk4MDE4"},"id":"MDEyOklzc3VlQ29tbWVudDU0NDA4OTcwNg==","body":"### From @hvds\n\nOn Sun\\, 18 Jun 2017 08\u0026#8203;:53\u0026#8203;:27 \\-0700\\, jwilk@\u0026#8203;jwilk\\.net wrote\u0026#8203;:\n\u003e Consider the following program\u0026#8203;:\n\u003e \n\u003e m'\\\\N\\{U\\+\\.\\}';\n\u003e \\_\\_END\\_\\_\n\u003e \n\u003e When you run it under valgrind\\, you get\u0026#8203;:\n\u003e \n\u003e Invalid read of size 2\n\\[\\.\\.\\.\\]\n\nI tried a few builds of perl \\- both blead and 5\\.26\\.0 \\- to reproduce this\\, without success\\. Please could you supply the output of 'perl \\-V' for the build with which you found this?\n\nFor future reports\\, it would be helpful if you could use 'perlbug'\\, which would include that sort of information automatically\\.\n\nCheers\\,\n\nHugo","bodyHTML":"\u003ch3 dir=\"auto\"\u003eFrom \u003ca class=\"user-mention notranslate\" data-hovercard-type=\"user\" data-hovercard-url=\"/users/hvds/hovercard\" data-octo-click=\"hovercard-link-click\" data-octo-dimensions=\"link_type:self\" href=\"https://github.com/hvds\"\u003e@hvds\u003c/a\u003e\u003c/h3\u003e\n\u003cp dir=\"auto\"\u003eOn Sun, 18 Jun 2017 08:53:27 -0700, jwilk@jwilk.net wrote:\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eConsider the following program:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003em'\\N{U+.}';\u003cbr\u003e\n__END__\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWhen you run it under valgrind, you get:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eInvalid read of size 2\u003cbr\u003e\n[...]\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eI tried a few builds of perl - both blead and 5.26.0 - to reproduce this, without success. Please could you supply the output of 'perl -V' for the build with which you found this?\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eFor future reports, it would be helpful if you could use 'perlbug', which would include that sort of information automatically.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eCheers,\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eHugo\u003c/p\u003e","bodyVersion":"a192b0d14a61beac5c762c0619a7609b2bf4ecfabce168ad4c1bc41ba3d0747d","viewerCanUpdate":false,"url":"https://github.com/Perl/perl5/issues/16025#issuecomment-544089706","createdAt":"2017-06-19T20:19:50Z","authorAssociation":"NONE","viewerCanDelete":false,"viewerCanMinimize":false,"viewerCanReport":false,"viewerCanReportToMaintainer":false,"viewerCanBlockFromOrg":false,"viewerCanUnblockFromOrg":false,"isHidden":false,"minimizedReason":null,"showSpammyBadge":false,"createdViaEmail":false,"authorToRepoOwnerSponsorship":null,"repository":{"id":"MDEwOlJlcG9zaXRvcnk4MTgzNTcw","name":"perl5","owner":{"__typename":"Organization","id":"MDEyOk9yZ2FuaXphdGlvbjM1ODU0MTE=","login":"Perl","url":"https://github.com/Perl"},"isPrivate":false,"slashCommandsEnabled":false,"nameWithOwner":"Perl/perl5","databaseId":8183570},"__isComment":"IssueComment","viewerCanReadUserContentEdits":true,"lastEditedAt":null,"lastUserContentEdit":null,"__isReactable":"IssueComment","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"__isNode":"IssueComment"},"cursor":"Y3Vyc29yOnYyOpPPAAABXMIC6nAAqTU0NDA4OTcwNg=="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":544089707,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"p5pRT","id":"MDQ6VXNlcjUxNzk4MDE4"},"id":"MDU6SXNzdWU1MDkzOTE2NTE=","number":16025,"locked":false,"databaseId":509391651},"author":{"__typename":"User","login":"p5pRT","avatarUrl":"https://avatars.githubusercontent.com/u/51798018?u=c0c9dec90db4d6102e88553f891e56b4bb45370e\u0026v=4","id":"MDQ6VXNlcjUxNzk4MDE4"},"id":"MDEyOklzc3VlQ29tbWVudDU0NDA4OTcwNw==","body":"The RT System itself - Status changed from 'new' to 'open'\n\n","bodyHTML":"\u003cp dir=\"auto\"\u003eThe RT System itself - Status changed from 'new' to 'open'\u003c/p\u003e","bodyVersion":"a8486952cad8274318179591829766a71e55450ce1f389d2f35ba2f01b9f4b94","viewerCanUpdate":false,"url":"https://github.com/Perl/perl5/issues/16025#issuecomment-544089707","createdAt":"2017-06-19T20:19:50Z","authorAssociation":"NONE","viewerCanDelete":false,"viewerCanMinimize":false,"viewerCanReport":false,"viewerCanReportToMaintainer":false,"viewerCanBlockFromOrg":false,"viewerCanUnblockFromOrg":false,"isHidden":false,"minimizedReason":null,"showSpammyBadge":false,"createdViaEmail":false,"authorToRepoOwnerSponsorship":null,"repository":{"id":"MDEwOlJlcG9zaXRvcnk4MTgzNTcw","name":"perl5","owner":{"__typename":"Organization","id":"MDEyOk9yZ2FuaXphdGlvbjM1ODU0MTE=","login":"Perl","url":"https://github.com/Perl"},"isPrivate":false,"slashCommandsEnabled":false,"nameWithOwner":"Perl/perl5","databaseId":8183570},"__isComment":"IssueComment","viewerCanReadUserContentEdits":true,"lastEditedAt":null,"lastUserContentEdit":null,"__isReactable":"IssueComment","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"__isNode":"IssueComment"},"cursor":"Y3Vyc29yOnYyOpPPAAABXMIC6nAAqTU0NDA4OTcwNw=="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":544089708,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"p5pRT","id":"MDQ6VXNlcjUxNzk4MDE4"},"id":"MDU6SXNzdWU1MDkzOTE2NTE=","number":16025,"locked":false,"databaseId":509391651},"author":{"__typename":"User","login":"p5pRT","avatarUrl":"https://avatars.githubusercontent.com/u/51798018?u=c0c9dec90db4d6102e88553f891e56b4bb45370e\u0026v=4","id":"MDQ6VXNlcjUxNzk4MDE4"},"id":"MDEyOklzc3VlQ29tbWVudDU0NDA4OTcwOA==","body":"### From @khwilliamson\n\nOn 06/18/2017 09\u0026#8203;:53 AM\\, Jakub Wilk \\(via RT\\) wrote\u0026#8203;:\n\u003e \\# New Ticket Created by Jakub Wilk\n\u003e \\# Please include the string\u0026#8203;: \\[perl \\#131598\\]\n\u003e \\# in the subject line of all future correspondence about this issue\\.\n\u003e \\# \\\u003cURL\u0026#8203;: https://rt-archive.perl.org/perl5/Ticket/Display.html?id=131598 \u003e\n\u003e \n\u003e \n\u003e Consider the following program\u0026#8203;:\n\u003e \n\u003e m'\\\\N\\{U\\+\\.\\}';\n\u003e \\_\\_END\\_\\_\n\u003e \n\u003e When you run it under valgrind\\, you get\u0026#8203;:\n\u003e \n\u003e Invalid read of size 2\n\u003e at 0x402E020\u0026#8203;: memcpy \\(in /usr/lib/valgrind/vgpreload\\_memcheck\\-x86\\-linux\\.so\\)\n\u003e by 0x815243E\u0026#8203;: Perl\\_sv\\_vcatpvfn\\_flags \\(sv\\.c\u0026#8203;:13067\\)\n\u003e by 0x814D860\u0026#8203;: Perl\\_sv\\_vsetpvfn \\(sv\\.c\u0026#8203;:10953\\)\n\u003e by 0x810985B\u0026#8203;: Perl\\_vmess \\(util\\.c\u0026#8203;:1485\\)\n\u003e by 0x8109E4C\u0026#8203;: Perl\\_vcroak \\(util\\.c\u0026#8203;:1714\\)\n\u003e by 0x8109EE5\u0026#8203;: Perl\\_croak \\(util\\.c\u0026#8203;:1761\\)\n\u003e by 0x80E8FFF\u0026#8203;: S\\_grok\\_bslash\\_N \\(regcomp\\.c\u0026#8203;:12168\\)\n\u003e by 0x80EB5B8\u0026#8203;: S\\_regatom \\(regcomp\\.c\u0026#8203;:12880\\)\n\u003e by 0x80E6A9D\u0026#8203;: S\\_regpiece \\(regcomp\\.c\u0026#8203;:11669\\)\n\u003e by 0x80E6872\u0026#8203;: S\\_regbranch \\(regcomp\\.c\u0026#8203;:11594\\)\n\u003e by 0x80E58D4\u0026#8203;: S\\_reg \\(regcomp\\.c\u0026#8203;:11332\\)\n\u003e by 0x80D7CCD\u0026#8203;: Perl\\_re\\_op\\_compile \\(regcomp\\.c\u0026#8203;:7101\\)\n\u003e Address 0x4288d1e is 6 bytes after a block of size 120 free'd\n\u003e at 0x402A3A8\u0026#8203;: free \\(in /usr/lib/valgrind/vgpreload\\_memcheck\\-x86\\-linux\\.so\\)\n\u003e by 0x810837B\u0026#8203;: Perl\\_safesysfree \\(util\\.c\u0026#8203;:388\\)\n\u003e by 0x816F501\u0026#8203;: Perl\\_leave\\_scope \\(scope\\.c\u0026#8203;:929\\)\n\u003e by 0x816DA76\u0026#8203;: Perl\\_pop\\_scope \\(scope\\.c\u0026#8203;:124\\)\n\u003e by 0x809BF63\u0026#8203;: S\\_sublex\\_done \\(toke\\.c\u0026#8203;:2569\\)\n\u003e by 0x80A1E24\u0026#8203;: Perl\\_yylex \\(toke\\.c\u0026#8203;:4918\\)\n\u003e by 0x80BE6A1\u0026#8203;: Perl\\_yyparse \\(perly\\.c\u0026#8203;:340\\)\n\u003e by 0x8086637\u0026#8203;: S\\_parse\\_body \\(perl\\.c\u0026#8203;:2377\\)\n\u003e by 0x808578B\u0026#8203;: perl\\_parse \\(perl\\.c\u0026#8203;:1692\\)\n\u003e by 0x8061751\u0026#8203;: main \\(perlmain\\.c\u0026#8203;:121\\)\n\u003e \n\u003e The above was tested on v5\\.26\\.0 built for i686\\-linux\\.\n\u003e \n\u003e The exact symptoms seem to vary with Perl version\\. For example\\, when I run it\n\u003e on Debian perl v5\\.24\\.1 on i386 \\(without valgrind this time\\)\\, I get the\n\u003e following warning on stderr\u0026#8203;:\n\u003e \n\u003e Invalid hexadecimal number in \\\\N\\{U\\+\\.\\.\\.\\} in regex; marked by \\\u003c\\-\\- HERE in m/ \\\u003c\\-\\- HERE \\\u003cbinary garbage\u003e\n\u003e \n\u003e where binary garbage looks like a large chunk of the program memory\\, including\n\u003e values of environment variables\\. :\\(\n\u003e \n\nI single stepped through this in blead\\. On a DEBUGGING build\\, instead \nan assertion fails\u0026#8203;:\n\n==15879== Process terminating with default action of signal 6 \\(SIGABRT\\)\n==15879== at 0x5B5A77F\u0026#8203;: raise \\(raise\\.c\u0026#8203;:58\\)\n==15879== by 0x5B5C379\u0026#8203;: abort \\(abort\\.c\u0026#8203;:89\\)\n==15879== by 0x5B52B46\u0026#8203;: \\_\\_assert\\_fail\\_base \\(assert\\.c\u0026#8203;:92\\)\n==15879== by 0x5B52BF1\u0026#8203;: \\_\\_assert\\_fail \\(assert\\.c\u0026#8203;:101\\)\n==15879== by 0x37E8AE\u0026#8203;: Perl\\_sv\\_vcatpvfn\\_flags \\(sv\\.c\u0026#8203;:12485\\)\n==15879== by 0x37A431\u0026#8203;: Perl\\_sv\\_vsetpvfn \\(sv\\.c\u0026#8203;:10961\\)\n==15879== by 0x2B3BEC\u0026#8203;: Perl\\_vmess \\(util\\.c\u0026#8203;:1487\\)\n==15879== by 0x2B50C9\u0026#8203;: Perl\\_vcroak \\(util\\.c\u0026#8203;:1716\\)\n==15879== by 0x2B54CA\u0026#8203;: Perl\\_croak \\(util\\.c\u0026#8203;:1763\\)\n==15879== by 0x26D817\u0026#8203;: S\\_grok\\_bslash\\_N \\(regcomp\\.c\u0026#8203;:12168\\)\n==15879== by 0x271CA3\u0026#8203;: S\\_regatom \\(regcomp\\.c\u0026#8203;:12932\\)\n==15879== by 0x2694D5\u0026#8203;: S\\_regpiece \\(regcomp\\.c\u0026#8203;:11668\\)\n\nWithout DEBUGGING\\, and with \\-O2 optimization\\, I get\n\nUsing Valgrind\\-3\\.12\\.0 and LibVEX; rerun with \\-h for copyright info\n==16556== Command\u0026#8203;: \\./perl \\-le m'\\\\\\\\N\\{U\\+\\.\\}';\n==16556==\n==16556== Invalid read of size 2\n==16556== at 0x4C34618\u0026#8203;: memmove \\(in \n/usr/lib/valgrind/vgpreload\\_memcheck\\-amd64\\-linux\\.so\\)\n==16556== by 0x1EB097\u0026#8203;: memcpy \\(string3\\.h\u0026#8203;:53\\)\n==16556== by 0x1EB097\u0026#8203;: Perl\\_sv\\_vcatpvfn\\_flags \\(sv\\.c\u0026#8203;:13338\\)\n==16556== by 0x1EE430\u0026#8203;: Perl\\_sv\\_vsetpvfn \\(sv\\.c\u0026#8203;:10961\\)\n==16556== by 0x1BB42D\u0026#8203;: Perl\\_vmess \\(util\\.c\u0026#8203;:1487\\)\n==16556== by 0x1BABB2\u0026#8203;: Perl\\_vcroak \\(util\\.c\u0026#8203;:1716\\)\n==16556== by 0x1BB693\u0026#8203;: Perl\\_croak \\(util\\.c\u0026#8203;:1763\\)\n==16556== by 0x19B638\u0026#8203;: S\\_grok\\_bslash\\_N \\(regcomp\\.c\u0026#8203;:12168\\)\n==16556== by 0x1A20B5\u0026#8203;: S\\_regatom \\(regcomp\\.c\u0026#8203;:12932\\)\n==16556== by 0x1A4C8C\u0026#8203;: S\\_regpiece \\(regcomp\\.c\u0026#8203;:11668\\)\n==16556== by 0x1A4C8C\u0026#8203;: S\\_regbranch \\(regcomp\\.c\u0026#8203;:11593\\)\n==16556== by 0x198431\u0026#8203;: S\\_reg \\(regcomp\\.c\u0026#8203;:11331\\)\n==16556== by 0x1AED3B\u0026#8203;: Perl\\_re\\_op\\_compile \\(regcomp\\.c\u0026#8203;:7100\\)\n==16556== by 0x14DE8C\u0026#8203;: Perl\\_pmruntime \\(op\\.c\u0026#8203;:5882\\)\n==16556== Address 0x5bb16a6 is 14 bytes after a block of size 120 free'd\n==16556== at 0x4C2ED5B\u0026#8203;: free \\(in \n/usr/lib/valgrind/vgpreload\\_memcheck\\-amd64\\-linux\\.so\\)\n==16556== by 0x2194BB\u0026#8203;: Perl\\_leave\\_scope \\(scope\\.c\u0026#8203;:929\\)\n==16556== by 0x185986\u0026#8203;: S\\_sublex\\_done \\(toke\\.c\u0026#8203;:2562\\)\n==16556== by 0x174DC9\u0026#8203;: Perl\\_yylex \\(toke\\.c\u0026#8203;:4912\\)\n==16556== by 0x1865FB\u0026#8203;: Perl\\_yyparse \\(perly\\.c\u0026#8203;:340\\)\n==16556== by 0x15A815\u0026#8203;: S\\_parse\\_body \\(perl\\.c\u0026#8203;:2401\\)\n==16556== by 0x15A815\u0026#8203;: perl\\_parse \\(perl\\.c\u0026#8203;:1719\\)\n==16556== by 0x1331F2\u0026#8203;: main \\(perlmain\\.c\u0026#8203;:121\\)\n==16556== Block was alloc'd at\n==16556== at 0x4C2DB2F\u0026#8203;: malloc \\(in \n/usr/lib/valgrind/vgpreload\\_memcheck\\-amd64\\-linux\\.so\\)\n==16556== by 0x1BA191\u0026#8203;: Perl\\_safesysmalloc \\(util\\.c\u0026#8203;:153\\)\n==16556== by 0x1703F8\u0026#8203;: S\\_sublex\\_push \\(toke\\.c\u0026#8203;:2475\\)\n==16556== by 0x1703F8\u0026#8203;: Perl\\_yylex \\(toke\\.c\u0026#8203;:4908\\)\n==16556== by 0x1865FB\u0026#8203;: Perl\\_yyparse \\(perly\\.c\u0026#8203;:340\\)\n==16556== by 0x15A815\u0026#8203;: S\\_parse\\_body \\(perl\\.c\u0026#8203;:2401\\)\n==16556== by 0x15A815\u0026#8203;: perl\\_parse \\(perl\\.c\u0026#8203;:1719\\)\n==16556== by 0x1331F2\u0026#8203;: main \\(perlmain\\.c\u0026#8203;:121\\)\n==16556==\n==16556== Invalid read of size 2\n==16556== at 0x4C34627\u0026#8203;: memmove \\(in \n/usr/lib/valgrind/vgpreload\\_memcheck\\-amd64\\-linux\\.so\\)\n==16556== by 0x1EB097\u0026#8203;: memcpy \\(string3\\.h\u0026#8203;:53\\)\n==16556== by 0x1EB097\u0026#8203;: Perl\\_sv\\_vcatpvfn\\_flags \\(sv\\.c\u0026#8203;:13338\\)\n==16556== by 0x1EE430\u0026#8203;: Perl\\_sv\\_vsetpvfn \\(sv\\.c\u0026#8203;:10961\\)\n==16556== by 0x1BB42D\u0026#8203;: Perl\\_vmess \\(util\\.c\u0026#8203;:1487\\)\n==16556== by 0x1BABB2\u0026#8203;: Perl\\_vcroak \\(util\\.c\u0026#8203;:1716\\)\n==16556== by 0x1BB693\u0026#8203;: Perl\\_croak \\(util\\.c\u0026#8203;:1763\\)\n==16556== by 0x19B638\u0026#8203;: S\\_grok\\_bslash\\_N \\(regcomp\\.c\u0026#8203;:12168\\)\n==16556== by 0x1A20B5\u0026#8203;: S\\_regatom \\(regcomp\\.c\u0026#8203;:12932\\)\n==16556== by 0x1A4C8C\u0026#8203;: S\\_regpiece \\(regcomp\\.c\u0026#8203;:11668\\)\n==16556== by 0x1A4C8C\u0026#8203;: S\\_regbranch \\(regcomp\\.c\u0026#8203;:11593\\)\n==16556== by 0x198431\u0026#8203;: S\\_reg \\(regcomp\\.c\u0026#8203;:11331\\)\n==16556== by 0x1AED3B\u0026#8203;: Perl\\_re\\_op\\_compile \\(regcomp\\.c\u0026#8203;:7100\\)\n==16556== by 0x14DE8C\u0026#8203;: Perl\\_pmruntime \\(op\\.c\u0026#8203;:5882\\)\n==16556== Address 0x5bb16aa is 18 bytes after a block of size 120 free'd\n==16556== at 0x4C2ED5B\u0026#8203;: free \\(in \n/usr/lib/valgrind/vgpreload\\_memcheck\\-amd64\\-linux\\.so\\)\n==16556== by 0x2194BB\u0026#8203;: Perl\\_leave\\_scope \\(scope\\.c\u0026#8203;:929\\)\n==16556== by 0x185986\u0026#8203;: S\\_sublex\\_done \\(toke\\.c\u0026#8203;:2562\\)\n==16556== by 0x174DC9\u0026#8203;: Perl\\_yylex \\(toke\\.c\u0026#8203;:4912\\)\n==16556== by 0x1865FB\u0026#8203;: Perl\\_yyparse \\(perly\\.c\u0026#8203;:340\\)\n==16556== by 0x15A815\u0026#8203;: S\\_parse\\_body \\(perl\\.c\u0026#8203;:2401\\)\n==16556== by 0x15A815\u0026#8203;: perl\\_parse \\(perl\\.c\u0026#8203;:1719\\)\n==16556== by 0x1331F2\u0026#8203;: main \\(perlmain\\.c\u0026#8203;:121\\)\n==16556== Block was alloc'd at\n==16556== at 0x4C2DB2F\u0026#8203;: malloc \\(in \n/usr/lib/valgrind/vgpreload\\_memcheck\\-amd64\\-linux\\.so\\)\n==16556== by 0x1BA191\u0026#8203;: Perl\\_safesysmalloc \\(util\\.c\u0026#8203;:153\\)\n==16556== by 0x1703F8\u0026#8203;: S\\_sublex\\_push \\(toke\\.c\u0026#8203;:2475\\)\n==16556== by 0x1703F8\u0026#8203;: Perl\\_yylex \\(toke\\.c\u0026#8203;:4908\\)\n==16556== by 0x1865FB\u0026#8203;: Perl\\_yyparse \\(perly\\.c\u0026#8203;:340\\)\n==16556== by 0x15A815\u0026#8203;: S\\_parse\\_body \\(perl\\.c\u0026#8203;:2401\\)\n==16556== by 0x15A815\u0026#8203;: perl\\_parse \\(perl\\.c\u0026#8203;:1719\\)\n==16556== by 0x1331F2\u0026#8203;: main \\(perlmain\\.c\u0026#8203;:121\\)\n==16556==\nInvalid hexadecimal number in \\\\N\\{U\\+\\.\\.\\.\\} in regex; marked by \\\u003c\\-\\- HERE in \nm/ \\\u003c\\-\\- HERE �PPp0��pP\\\\N\\{U\\+\\.\\}/ at \\-e line 1\\.\n\nIt looks to me that S\\_grok\\_bslash\\_N is passing correct stuff to the \nerror routines\\. I single stepped through it\\, but I would have to do \nmuch more detailed study of an area I don't really understand to figure \nout what's going wrong\\.","bodyHTML":"\u003ch3 dir=\"auto\"\u003eFrom \u003ca class=\"user-mention notranslate\" data-hovercard-type=\"user\" data-hovercard-url=\"/users/khwilliamson/hovercard\" data-octo-click=\"hovercard-link-click\" data-octo-dimensions=\"link_type:self\" href=\"https://github.com/khwilliamson\"\u003e@khwilliamson\u003c/a\u003e\u003c/h3\u003e\n\u003cp dir=\"auto\"\u003eOn 06/18/2017 09:53 AM, Jakub Wilk (via RT) wrote:\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003e# New Ticket Created by Jakub Wilk\u003cbr\u003e\n# Please include the string: [perl #131598]\u003cbr\u003e\n# in the subject line of all future correspondence about this issue.\u003cbr\u003e\n# \u0026lt;URL: \u003ca href=\"https://rt-archive.perl.org/perl5/Ticket/Display.html?id=131598\" rel=\"nofollow\"\u003ehttps://rt-archive.perl.org/perl5/Ticket/Display.html?id=131598\u003c/a\u003e \u0026gt;\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eConsider the following program:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003em'\\N{U+.}';\u003cbr\u003e\n__END__\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWhen you run it under valgrind, you get:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\" Invalid read of size 2\n at 0x402E020\u0026amp;#8203;: memcpy \\(in /usr/lib/valgrind/vgpreload\\_memcheck\\-x86\\-linux\\.so\\)\n by 0x815243E\u0026amp;#8203;: Perl\\_sv\\_vcatpvfn\\_flags \\(sv\\.c\u0026amp;#8203;:13067\\)\n by 0x814D860\u0026amp;#8203;: Perl\\_sv\\_vsetpvfn \\(sv\\.c\u0026amp;#8203;:10953\\)\n by 0x810985B\u0026amp;#8203;: Perl\\_vmess \\(util\\.c\u0026amp;#8203;:1485\\)\n by 0x8109E4C\u0026amp;#8203;: Perl\\_vcroak \\(util\\.c\u0026amp;#8203;:1714\\)\n by 0x8109EE5\u0026amp;#8203;: Perl\\_croak \\(util\\.c\u0026amp;#8203;:1761\\)\n by 0x80E8FFF\u0026amp;#8203;: S\\_grok\\_bslash\\_N \\(regcomp\\.c\u0026amp;#8203;:12168\\)\n by 0x80EB5B8\u0026amp;#8203;: S\\_regatom \\(regcomp\\.c\u0026amp;#8203;:12880\\)\n by 0x80E6A9D\u0026amp;#8203;: S\\_regpiece \\(regcomp\\.c\u0026amp;#8203;:11669\\)\n by 0x80E6872\u0026amp;#8203;: S\\_regbranch \\(regcomp\\.c\u0026amp;#8203;:11594\\)\n by 0x80E58D4\u0026amp;#8203;: S\\_reg \\(regcomp\\.c\u0026amp;#8203;:11332\\)\n by 0x80D7CCD\u0026amp;#8203;: Perl\\_re\\_op\\_compile \\(regcomp\\.c\u0026amp;#8203;:7101\\)\n Address 0x4288d1e is 6 bytes after a block of size 120 free'd\n at 0x402A3A8\u0026amp;#8203;: free \\(in /usr/lib/valgrind/vgpreload\\_memcheck\\-x86\\-linux\\.so\\)\n by 0x810837B\u0026amp;#8203;: Perl\\_safesysfree \\(util\\.c\u0026amp;#8203;:388\\)\n by 0x816F501\u0026amp;#8203;: Perl\\_leave\\_scope \\(scope\\.c\u0026amp;#8203;:929\\)\n by 0x816DA76\u0026amp;#8203;: Perl\\_pop\\_scope \\(scope\\.c\u0026amp;#8203;:124\\)\n by 0x809BF63\u0026amp;#8203;: S\\_sublex\\_done \\(toke\\.c\u0026amp;#8203;:2569\\)\n by 0x80A1E24\u0026amp;#8203;: Perl\\_yylex \\(toke\\.c\u0026amp;#8203;:4918\\)\n by 0x80BE6A1\u0026amp;#8203;: Perl\\_yyparse \\(perly\\.c\u0026amp;#8203;:340\\)\n by 0x8086637\u0026amp;#8203;: S\\_parse\\_body \\(perl\\.c\u0026amp;#8203;:2377\\)\n by 0x808578B\u0026amp;#8203;: perl\\_parse \\(perl\\.c\u0026amp;#8203;:1692\\)\n by 0x8061751\u0026amp;#8203;: main \\(perlmain\\.c\u0026amp;#8203;:121\\)\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode class=\"notranslate\"\u003e Invalid read of size 2\n at 0x402E020\u0026amp;#8203;: memcpy \\(in /usr/lib/valgrind/vgpreload\\_memcheck\\-x86\\-linux\\.so\\)\n by 0x815243E\u0026amp;#8203;: Perl\\_sv\\_vcatpvfn\\_flags \\(sv\\.c\u0026amp;#8203;:13067\\)\n by 0x814D860\u0026amp;#8203;: Perl\\_sv\\_vsetpvfn \\(sv\\.c\u0026amp;#8203;:10953\\)\n by 0x810985B\u0026amp;#8203;: Perl\\_vmess \\(util\\.c\u0026amp;#8203;:1485\\)\n by 0x8109E4C\u0026amp;#8203;: Perl\\_vcroak \\(util\\.c\u0026amp;#8203;:1714\\)\n by 0x8109EE5\u0026amp;#8203;: Perl\\_croak \\(util\\.c\u0026amp;#8203;:1761\\)\n by 0x80E8FFF\u0026amp;#8203;: S\\_grok\\_bslash\\_N \\(regcomp\\.c\u0026amp;#8203;:12168\\)\n by 0x80EB5B8\u0026amp;#8203;: S\\_regatom \\(regcomp\\.c\u0026amp;#8203;:12880\\)\n by 0x80E6A9D\u0026amp;#8203;: S\\_regpiece \\(regcomp\\.c\u0026amp;#8203;:11669\\)\n by 0x80E6872\u0026amp;#8203;: S\\_regbranch \\(regcomp\\.c\u0026amp;#8203;:11594\\)\n by 0x80E58D4\u0026amp;#8203;: S\\_reg \\(regcomp\\.c\u0026amp;#8203;:11332\\)\n by 0x80D7CCD\u0026amp;#8203;: Perl\\_re\\_op\\_compile \\(regcomp\\.c\u0026amp;#8203;:7101\\)\n Address 0x4288d1e is 6 bytes after a block of size 120 free'd\n at 0x402A3A8\u0026amp;#8203;: free \\(in /usr/lib/valgrind/vgpreload\\_memcheck\\-x86\\-linux\\.so\\)\n by 0x810837B\u0026amp;#8203;: Perl\\_safesysfree \\(util\\.c\u0026amp;#8203;:388\\)\n by 0x816F501\u0026amp;#8203;: Perl\\_leave\\_scope \\(scope\\.c\u0026amp;#8203;:929\\)\n by 0x816DA76\u0026amp;#8203;: Perl\\_pop\\_scope \\(scope\\.c\u0026amp;#8203;:124\\)\n by 0x809BF63\u0026amp;#8203;: S\\_sublex\\_done \\(toke\\.c\u0026amp;#8203;:2569\\)\n by 0x80A1E24\u0026amp;#8203;: Perl\\_yylex \\(toke\\.c\u0026amp;#8203;:4918\\)\n by 0x80BE6A1\u0026amp;#8203;: Perl\\_yyparse \\(perly\\.c\u0026amp;#8203;:340\\)\n by 0x8086637\u0026amp;#8203;: S\\_parse\\_body \\(perl\\.c\u0026amp;#8203;:2377\\)\n by 0x808578B\u0026amp;#8203;: perl\\_parse \\(perl\\.c\u0026amp;#8203;:1692\\)\n by 0x8061751\u0026amp;#8203;: main \\(perlmain\\.c\u0026amp;#8203;:121\\)\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe above was tested on v5.26.0 built for i686-linux.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe exact symptoms seem to vary with Perl version. For example, when I run it\u003cbr\u003e\non Debian perl v5.24.1 on i386 (without valgrind this time), I get the\u003cbr\u003e\nfollowing warning on stderr:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\" Invalid hexadecimal number in \\\\N\\{U\\+\\.\\.\\.\\} in regex; marked by \\\u0026lt;\\-\\- HERE in m/ \\\u0026lt;\\-\\- HERE \\\u0026lt;binary garbage\u0026gt;\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode class=\"notranslate\"\u003e Invalid hexadecimal number in \\\\N\\{U\\+\\.\\.\\.\\} in regex; marked by \\\u0026lt;\\-\\- HERE in m/ \\\u0026lt;\\-\\- HERE \\\u0026lt;binary garbage\u0026gt;\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003ewhere binary garbage looks like a large chunk of the program memory, including\u003cbr\u003e\nvalues of environment variables. :(\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eI single stepped through this in blead. On a DEBUGGING build, instead\u003cbr\u003e\nan assertion fails:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e==15879== Process terminating with default action of signal 6 (SIGABRT)\u003cbr\u003e\n==15879== at 0x5B5A77F: raise (raise.c:58)\u003cbr\u003e\n==15879== by 0x5B5C379: abort (abort.c:89)\u003cbr\u003e\n==15879== by 0x5B52B46: __assert_fail_base (assert.c:92)\u003cbr\u003e\n==15879== by 0x5B52BF1: __assert_fail (assert.c:101)\u003cbr\u003e\n==15879== by 0x37E8AE: Perl_sv_vcatpvfn_flags (sv.c:12485)\u003cbr\u003e\n==15879== by 0x37A431: Perl_sv_vsetpvfn (sv.c:10961)\u003cbr\u003e\n==15879== by 0x2B3BEC: Perl_vmess (util.c:1487)\u003cbr\u003e\n==15879== by 0x2B50C9: Perl_vcroak (util.c:1716)\u003cbr\u003e\n==15879== by 0x2B54CA: Perl_croak (util.c:1763)\u003cbr\u003e\n==15879== by 0x26D817: S_grok_bslash_N (regcomp.c:12168)\u003cbr\u003e\n==15879== by 0x271CA3: S_regatom (regcomp.c:12932)\u003cbr\u003e\n==15879== by 0x2694D5: S_regpiece (regcomp.c:11668)\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWithout DEBUGGING, and with -O2 optimization, I get\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eUsing Valgrind-3.12.0 and LibVEX; rerun with -h for copyright info\u003cbr\u003e\n==16556== Command: ./perl -le m'\\\\N{U+.}';\u003cbr\u003e\n==16556==\u003cbr\u003e\n==16556== Invalid read of size 2\u003cbr\u003e\n==16556== at 0x4C34618: memmove (in\u003cbr\u003e\n/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)\u003cbr\u003e\n==16556== by 0x1EB097: memcpy (string3.h:53)\u003cbr\u003e\n==16556== by 0x1EB097: Perl_sv_vcatpvfn_flags (sv.c:13338)\u003cbr\u003e\n==16556== by 0x1EE430: Perl_sv_vsetpvfn (sv.c:10961)\u003cbr\u003e\n==16556== by 0x1BB42D: Perl_vmess (util.c:1487)\u003cbr\u003e\n==16556== by 0x1BABB2: Perl_vcroak (util.c:1716)\u003cbr\u003e\n==16556== by 0x1BB693: Perl_croak (util.c:1763)\u003cbr\u003e\n==16556== by 0x19B638: S_grok_bslash_N (regcomp.c:12168)\u003cbr\u003e\n==16556== by 0x1A20B5: S_regatom (regcomp.c:12932)\u003cbr\u003e\n==16556== by 0x1A4C8C: S_regpiece (regcomp.c:11668)\u003cbr\u003e\n==16556== by 0x1A4C8C: S_regbranch (regcomp.c:11593)\u003cbr\u003e\n==16556== by 0x198431: S_reg (regcomp.c:11331)\u003cbr\u003e\n==16556== by 0x1AED3B: Perl_re_op_compile (regcomp.c:7100)\u003cbr\u003e\n==16556== by 0x14DE8C: Perl_pmruntime (op.c:5882)\u003cbr\u003e\n==16556== Address 0x5bb16a6 is 14 bytes after a block of size 120 free'd\u003cbr\u003e\n==16556== at 0x4C2ED5B: free (in\u003cbr\u003e\n/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)\u003cbr\u003e\n==16556== by 0x2194BB: Perl_leave_scope (scope.c:929)\u003cbr\u003e\n==16556== by 0x185986: S_sublex_done (toke.c:2562)\u003cbr\u003e\n==16556== by 0x174DC9: Perl_yylex (toke.c:4912)\u003cbr\u003e\n==16556== by 0x1865FB: Perl_yyparse (perly.c:340)\u003cbr\u003e\n==16556== by 0x15A815: S_parse_body (perl.c:2401)\u003cbr\u003e\n==16556== by 0x15A815: perl_parse (perl.c:1719)\u003cbr\u003e\n==16556== by 0x1331F2: main (perlmain.c:121)\u003cbr\u003e\n==16556== Block was alloc'd at\u003cbr\u003e\n==16556== at 0x4C2DB2F: malloc (in\u003cbr\u003e\n/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)\u003cbr\u003e\n==16556== by 0x1BA191: Perl_safesysmalloc (util.c:153)\u003cbr\u003e\n==16556== by 0x1703F8: S_sublex_push (toke.c:2475)\u003cbr\u003e\n==16556== by 0x1703F8: Perl_yylex (toke.c:4908)\u003cbr\u003e\n==16556== by 0x1865FB: Perl_yyparse (perly.c:340)\u003cbr\u003e\n==16556== by 0x15A815: S_parse_body (perl.c:2401)\u003cbr\u003e\n==16556== by 0x15A815: perl_parse (perl.c:1719)\u003cbr\u003e\n==16556== by 0x1331F2: main (perlmain.c:121)\u003cbr\u003e\n==16556==\u003cbr\u003e\n==16556== Invalid read of size 2\u003cbr\u003e\n==16556== at 0x4C34627: memmove (in\u003cbr\u003e\n/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)\u003cbr\u003e\n==16556== by 0x1EB097: memcpy (string3.h:53)\u003cbr\u003e\n==16556== by 0x1EB097: Perl_sv_vcatpvfn_flags (sv.c:13338)\u003cbr\u003e\n==16556== by 0x1EE430: Perl_sv_vsetpvfn (sv.c:10961)\u003cbr\u003e\n==16556== by 0x1BB42D: Perl_vmess (util.c:1487)\u003cbr\u003e\n==16556== by 0x1BABB2: Perl_vcroak (util.c:1716)\u003cbr\u003e\n==16556== by 0x1BB693: Perl_croak (util.c:1763)\u003cbr\u003e\n==16556== by 0x19B638: S_grok_bslash_N (regcomp.c:12168)\u003cbr\u003e\n==16556== by 0x1A20B5: S_regatom (regcomp.c:12932)\u003cbr\u003e\n==16556== by 0x1A4C8C: S_regpiece (regcomp.c:11668)\u003cbr\u003e\n==16556== by 0x1A4C8C: S_regbranch (regcomp.c:11593)\u003cbr\u003e\n==16556== by 0x198431: S_reg (regcomp.c:11331)\u003cbr\u003e\n==16556== by 0x1AED3B: Perl_re_op_compile (regcomp.c:7100)\u003cbr\u003e\n==16556== by 0x14DE8C: Perl_pmruntime (op.c:5882)\u003cbr\u003e\n==16556== Address 0x5bb16aa is 18 bytes after a block of size 120 free'd\u003cbr\u003e\n==16556== at 0x4C2ED5B: free (in\u003cbr\u003e\n/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)\u003cbr\u003e\n==16556== by 0x2194BB: Perl_leave_scope (scope.c:929)\u003cbr\u003e\n==16556== by 0x185986: S_sublex_done (toke.c:2562)\u003cbr\u003e\n==16556== by 0x174DC9: Perl_yylex (toke.c:4912)\u003cbr\u003e\n==16556== by 0x1865FB: Perl_yyparse (perly.c:340)\u003cbr\u003e\n==16556== by 0x15A815: S_parse_body (perl.c:2401)\u003cbr\u003e\n==16556== by 0x15A815: perl_parse (perl.c:1719)\u003cbr\u003e\n==16556== by 0x1331F2: main (perlmain.c:121)\u003cbr\u003e\n==16556== Block was alloc'd at\u003cbr\u003e\n==16556== at 0x4C2DB2F: malloc (in\u003cbr\u003e\n/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)\u003cbr\u003e\n==16556== by 0x1BA191: Perl_safesysmalloc (util.c:153)\u003cbr\u003e\n==16556== by 0x1703F8: S_sublex_push (toke.c:2475)\u003cbr\u003e\n==16556== by 0x1703F8: Perl_yylex (toke.c:4908)\u003cbr\u003e\n==16556== by 0x1865FB: Perl_yyparse (perly.c:340)\u003cbr\u003e\n==16556== by 0x15A815: S_parse_body (perl.c:2401)\u003cbr\u003e\n==16556== by 0x15A815: perl_parse (perl.c:1719)\u003cbr\u003e\n==16556== by 0x1331F2: main (perlmain.c:121)\u003cbr\u003e\n==16556==\u003cbr\u003e\nInvalid hexadecimal number in \\N{U+...} in regex; marked by \u0026lt;-- HERE in\u003cbr\u003e\nm/ \u0026lt;-- HERE �PPp0��pP\\N{U+.}/ at -e line 1.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIt looks to me that S_grok_bslash_N is passing correct stuff to the\u003cbr\u003e\nerror routines. I single stepped through it, but I would have to do\u003cbr\u003e\nmuch more detailed study of an area I don't really understand to figure\u003cbr\u003e\nout what's going wrong.\u003c/p\u003e","bodyVersion":"b621d86b0cd8bb558a7a93972ffa1e0cee676908e9fb41b27681f2534127f571","viewerCanUpdate":false,"url":"https://github.com/Perl/perl5/issues/16025#issuecomment-544089708","createdAt":"2017-06-20T01:23:33Z","authorAssociation":"NONE","viewerCanDelete":false,"viewerCanMinimize":false,"viewerCanReport":false,"viewerCanReportToMaintainer":false,"viewerCanBlockFromOrg":false,"viewerCanUnblockFromOrg":false,"isHidden":false,"minimizedReason":null,"showSpammyBadge":false,"createdViaEmail":false,"authorToRepoOwnerSponsorship":null,"repository":{"id":"MDEwOlJlcG9zaXRvcnk4MTgzNTcw","name":"perl5","owner":{"__typename":"Organization","id":"MDEyOk9yZ2FuaXphdGlvbjM1ODU0MTE=","login":"Perl","url":"https://github.com/Perl"},"isPrivate":false,"slashCommandsEnabled":false,"nameWithOwner":"Perl/perl5","databaseId":8183570},"__isComment":"IssueComment","viewerCanReadUserContentEdits":true,"lastEditedAt":null,"lastUserContentEdit":null,"__isReactable":"IssueComment","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"__isNode":"IssueComment"},"cursor":"Y3Vyc29yOnYyOpPPAAABXMMY-ggAqTU0NDA4OTcwOA=="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":544089709,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"p5pRT","id":"MDQ6VXNlcjUxNzk4MDE4"},"id":"MDU6SXNzdWU1MDkzOTE2NTE=","number":16025,"locked":false,"databaseId":509391651},"author":{"__typename":"User","login":"p5pRT","avatarUrl":"https://avatars.githubusercontent.com/u/51798018?u=c0c9dec90db4d6102e88553f891e56b4bb45370e\u0026v=4","id":"MDQ6VXNlcjUxNzk4MDE4"},"id":"MDEyOklzc3VlQ29tbWVudDU0NDA4OTcwOQ==","body":"### From @iabyn\n\nOn Mon\\, Jun 19\\, 2017 at 07\u0026#8203;:23\u0026#8203;:10PM \\-0600\\, Karl Williamson wrote\u0026#8203;:\n\u003e It looks to me that S\\_grok\\_bslash\\_N is passing correct stuff to the error\n\u003e routines\\.\n\nOr maybe it isn't :\\-\\)\n\nvFAIL\\(\\) is using the \"%\"UTF8f mechanism to pass a \\(possibly utf8\\) string\nbuffer for printing the diagnostic error\\.\n\nIt uses this\u0026#8203;:\n\n\\#define REPORT\\_LOCATION\\_ARGS\\(xC\\) \\\\\n\u0026nbsp; UTF8fARG\\(UTF\\, \\\\\n\u0026nbsp; \\(xI\\(xC\\) \u003e eC\\) /\\* Don't run off end \\*/ \\\\\n\u0026nbsp; ? eC \\- sC /\\* Length before the \\\u003c\\-\\-HERE \\*/ \\\\\n\u0026nbsp; : xI\\_offset\\(xC\\)\\, \\\\\n\u0026nbsp; sC\\)\\, /\\* The input pattern printed up to the \\\u003c\\-\\-HERE \\*/ \\\\\n\u0026nbsp; UTF8fARG\\(UTF\\, \\\\\n\u0026nbsp; \\(xI\\(xC\\) \u003e eC\\) ? 0 : eC \\- xI\\(xC\\)\\, /\\* Length after \\\u003c\\-\\-HERE \\*/ \\\\\n\u0026nbsp; \\(xI\\(xC\\) \u003e eC\\) ? eC : xI\\(xC\\)\\) /\\* pattern after \\\u003c\\-\\-HERE \\*/\n\nLooking at the second UTF8fARG\\,\n\neC expands to\u0026#8203;: pRExC\\_state\\-\u003eprecomp\\_end\n\nxI\\(xC\\) expands to\u0026#8203;: pRExC\\_state\\-\u003eprecomp\n\u0026nbsp; \\+ \\(\\(IV\\) \\(pRExC\\_state\\-\u003eprecomp\\_adj\n\u0026nbsp; \\+ \\(pRExC\\_state\\-\u003eparse \\- pRExC\\_state\\-\u003eadjusted\\_start\\)\\)\\)\n\n\nAt this point I see the following values\u0026#8203;:\n\n\\(gdb\\) p pRExC\\_state\\-\u003eprecomp\n$3 = 0xb30288 \"\\\\\\\\N\\{U\\+\\.\\}\"\n\\(gdb\\) p pRExC\\_state\\-\u003eprecomp\\_end\n$4 = 0xb3028f \"\"\n\\(gdb\\) p pRExC\\_state\\-\u003eprecomp\\_adj\n$7 = 0x0\n\\(gdb\\) p pRExC\\_state\\-\u003eparse\n$8 = 0xb3028e \"\\}\"\n\\(gdb\\) p pRExC\\_state\\-\u003eadjusted\\_start\n$9 = 0xb2ef48 \"?\u0026#8203;:\\\\\\\\x\\{\\}\\)\"\n\nIt appears that pRExC\\_state\\-\u003eadjusted\\_start is \"wild\"\\, causing potentially\nlarge chunks of garbage to be output\\.\n\nCan you handle it from here? \\(regcomp\\.c is\\, to me\\, a riddle wrapped in\na mystery wrapped in an enigma\\)\\.\n\n\n\\-\\- \nRed sky at night \\- gerroff my land\\!\nRed sky at morning \\- gerroff my land\\!\n\u0026nbsp; \\-\\- old farmers' sayings \\#14","bodyHTML":"\u003ch3 dir=\"auto\"\u003eFrom \u003ca class=\"user-mention notranslate\" data-hovercard-type=\"user\" data-hovercard-url=\"/users/iabyn/hovercard\" data-octo-click=\"hovercard-link-click\" data-octo-dimensions=\"link_type:self\" href=\"https://github.com/iabyn\"\u003e@iabyn\u003c/a\u003e\u003c/h3\u003e\n\u003cp dir=\"auto\"\u003eOn Mon, Jun 19, 2017 at 07:23:10PM -0600, Karl Williamson wrote:\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eIt looks to me that S_grok_bslash_N is passing correct stuff to the error\u003cbr\u003e\nroutines.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eOr maybe it isn't :-)\u003c/p\u003e\n\u003cp dir=\"auto\"\u003evFAIL() is using the \"%\"UTF8f mechanism to pass a (possibly utf8) string\u003cbr\u003e\nbuffer for printing the diagnostic error.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIt uses this:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e#define REPORT_LOCATION_ARGS(xC) \\\u003cbr\u003e\n UTF8fARG(UTF, \\\u003cbr\u003e\n (xI(xC) \u0026gt; eC) /* Don't run off end */ \\\u003cbr\u003e\n ? eC - sC /* Length before the \u0026lt;--HERE */ \\\u003cbr\u003e\n : xI_offset(xC), \\\u003cbr\u003e\n sC), /* The input pattern printed up to the \u0026lt;--HERE */ \\\u003cbr\u003e\n UTF8fARG(UTF, \\\u003cbr\u003e\n (xI(xC) \u0026gt; eC) ? 0 : eC - xI(xC), /* Length after \u0026lt;--HERE */ \\\u003cbr\u003e\n (xI(xC) \u0026gt; eC) ? eC : xI(xC)) /* pattern after \u0026lt;--HERE */\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eLooking at the second UTF8fARG,\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eeC expands to: pRExC_state-\u0026gt;precomp_end\u003c/p\u003e\n\u003cp dir=\"auto\"\u003exI(xC) expands to: pRExC_state-\u0026gt;precomp\u003cbr\u003e\n + ((IV) (pRExC_state-\u0026gt;precomp_adj\u003cbr\u003e\n + (pRExC_state-\u0026gt;parse - pRExC_state-\u0026gt;adjusted_start)))\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eAt this point I see the following values:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e(gdb) p pRExC_state-\u0026gt;precomp\u003cbr\u003e\n$3 = 0xb30288 \"\\\\N{U+.}\"\u003cbr\u003e\n(gdb) p pRExC_state-\u0026gt;precomp_end\u003cbr\u003e\n$4 = 0xb3028f \"\"\u003cbr\u003e\n(gdb) p pRExC_state-\u0026gt;precomp_adj\u003cbr\u003e\n$7 = 0x0\u003cbr\u003e\n(gdb) p pRExC_state-\u0026gt;parse\u003cbr\u003e\n$8 = 0xb3028e \"}\"\u003cbr\u003e\n(gdb) p pRExC_state-\u0026gt;adjusted_start\u003cbr\u003e\n$9 = 0xb2ef48 \"?:\\\\x{})\"\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIt appears that pRExC_state-\u0026gt;adjusted_start is \"wild\", causing potentially\u003cbr\u003e\nlarge chunks of garbage to be output.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eCan you handle it from here? (regcomp.c is, to me, a riddle wrapped in\u003cbr\u003e\na mystery wrapped in an enigma).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e--\u003cbr\u003e\nRed sky at night - gerroff my land!\u003cbr\u003e\nRed sky at morning - gerroff my land!\u003cbr\u003e\n -- old farmers' sayings \u003ca class=\"issue-link js-issue-link\" data-error-text=\"Failed to load title\" data-id=\"336215828\" data-permission-text=\"Title is private\" data-url=\"https://github.com/Perl/perl5/issues/14\" data-hovercard-type=\"pull_request\" data-hovercard-url=\"/Perl/perl5/pull/14/hovercard\" href=\"https://github.com/Perl/perl5/pull/14\"\u003e#14\u003c/a\u003e\u003c/p\u003e","bodyVersion":"ad9fee667a417df7b5f2b562892baf26785e54aedb0503658d13b20635fd37d2","viewerCanUpdate":false,"url":"https://github.com/Perl/perl5/issues/16025#issuecomment-544089709","createdAt":"2017-06-20T07:58:53Z","authorAssociation":"NONE","viewerCanDelete":false,"viewerCanMinimize":false,"viewerCanReport":false,"viewerCanReportToMaintainer":false,"viewerCanBlockFromOrg":false,"viewerCanUnblockFromOrg":false,"isHidden":false,"minimizedReason":null,"showSpammyBadge":false,"createdViaEmail":false,"authorToRepoOwnerSponsorship":null,"repository":{"id":"MDEwOlJlcG9zaXRvcnk4MTgzNTcw","name":"perl5","owner":{"__typename":"Organization","id":"MDEyOk9yZ2FuaXphdGlvbjM1ODU0MTE=","login":"Perl","url":"https://github.com/Perl"},"isPrivate":false,"slashCommandsEnabled":false,"nameWithOwner":"Perl/perl5","databaseId":8183570},"__isComment":"IssueComment","viewerCanReadUserContentEdits":true,"lastEditedAt":null,"lastUserContentEdit":null,"__isReactable":"IssueComment","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"__isNode":"IssueComment"},"cursor":"Y3Vyc29yOnYyOpPPAAABXMSC6kgAqTU0NDA4OTcwOQ=="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":544089711,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"p5pRT","id":"MDQ6VXNlcjUxNzk4MDE4"},"id":"MDU6SXNzdWU1MDkzOTE2NTE=","number":16025,"locked":false,"databaseId":509391651},"author":{"__typename":"User","login":"p5pRT","avatarUrl":"https://avatars.githubusercontent.com/u/51798018?u=c0c9dec90db4d6102e88553f891e56b4bb45370e\u0026v=4","id":"MDQ6VXNlcjUxNzk4MDE4"},"id":"MDEyOklzc3VlQ29tbWVudDU0NDA4OTcxMQ==","body":"### From @khwilliamson\n\nOn 06/20/2017 01\u0026#8203;:58 AM\\, Dave Mitchell wrote\u0026#8203;:\n\u003e On Mon\\, Jun 19\\, 2017 at 07\u0026#8203;:23\u0026#8203;:10PM \\-0600\\, Karl Williamson wrote\u0026#8203;:\n\u003e\u003e It looks to me that S\\_grok\\_bslash\\_N is passing correct stuff to the error\n\u003e\u003e routines\\.\n\u003e \n\u003e Or maybe it isn't :\\-\\)\n\u003e \n\u003e vFAIL\\(\\) is using the \"%\"UTF8f mechanism to pass a \\(possibly utf8\\) string\n\u003e buffer for printing the diagnostic error\\.\n\u003e \n\u003e It uses this\u0026#8203;:\n\u003e \n\u003e \\#define REPORT\\_LOCATION\\_ARGS\\(xC\\) \\\\\n\u003e UTF8fARG\\(UTF\\, \\\\\n\u003e \\(xI\\(xC\\) \u003e eC\\) /\\* Don't run off end \\*/ \\\\\n\u003e ? eC \\- sC /\\* Length before the \\\u003c\\-\\-HERE \\*/ \\\\\n\u003e : xI\\_offset\\(xC\\)\\, \\\\\n\u003e sC\\)\\, /\\* The input pattern printed up to the \\\u003c\\-\\-HERE \\*/ \\\\\n\u003e UTF8fARG\\(UTF\\, \\\\\n\u003e \\(xI\\(xC\\) \u003e eC\\) ? 0 : eC \\- xI\\(xC\\)\\, /\\* Length after \\\u003c\\-\\-HERE \\*/ \\\\\n\u003e \\(xI\\(xC\\) \u003e eC\\) ? eC : xI\\(xC\\)\\) /\\* pattern after \\\u003c\\-\\-HERE \\*/\n\u003e \n\u003e Looking at the second UTF8fARG\\,\n\u003e \n\u003e eC expands to\u0026#8203;: pRExC\\_state\\-\u003eprecomp\\_end\n\u003e \n\u003e xI\\(xC\\) expands to\u0026#8203;: pRExC\\_state\\-\u003eprecomp\n\u003e \\+ \\(\\(IV\\) \\(pRExC\\_state\\-\u003eprecomp\\_adj\n\u003e \\+ \\(pRExC\\_state\\-\u003eparse \\- pRExC\\_state\\-\u003eadjusted\\_start\\)\\)\\)\n\u003e \n\u003e \n\u003e At this point I see the following values\u0026#8203;:\n\u003e \n\u003e \\(gdb\\) p pRExC\\_state\\-\u003eprecomp\n\u003e $3 = 0xb30288 \"\\\\\\\\N\\{U\\+\\.\\}\"\n\u003e \\(gdb\\) p pRExC\\_state\\-\u003eprecomp\\_end\n\u003e $4 = 0xb3028f \"\"\n\u003e \\(gdb\\) p pRExC\\_state\\-\u003eprecomp\\_adj\n\u003e $7 = 0x0\n\u003e \\(gdb\\) p pRExC\\_state\\-\u003eparse\n\u003e $8 = 0xb3028e \"\\}\"\n\u003e \\(gdb\\) p pRExC\\_state\\-\u003eadjusted\\_start\n\u003e $9 = 0xb2ef48 \"?\u0026#8203;:\\\\\\\\x\\{\\}\\)\"\n\u003e \n\u003e It appears that pRExC\\_state\\-\u003eadjusted\\_start is \"wild\"\\, causing potentially\n\u003e large chunks of garbage to be output\\.\n\u003e \n\u003e Can you handle it from here? \n\nYes\\, and thank you for the diagnosis\\. I have a trivial fix\\. This is a \ncase of macros hiding stuff not quite completely\\, allowing me to forget \nabout that stuff\\, but not hiding it enough that it can safely be \ncompletely forgotten about\\.\n\nI will do an audit looking for similar cases in regcomp\\.c\\.\n\nThe question now is how do we handle this\\. Since the fix is so trivial\\, \nit can be backported to whatever releases we deem doing it to\\. I don't \nunderstand what the consequences of this are for an attack\\.\n\n\\(regcomp\\.c is\\, to me\\, a riddle wrapped in\n\u003e a mystery wrapped in an enigma\\)\\.\n\nThat's how I feel about a bunch of the other core code\\. \\(And about the \nregex optimizer\\)","bodyHTML":"\u003ch3 dir=\"auto\"\u003eFrom \u003ca class=\"user-mention notranslate\" data-hovercard-type=\"user\" data-hovercard-url=\"/users/khwilliamson/hovercard\" data-octo-click=\"hovercard-link-click\" data-octo-dimensions=\"link_type:self\" href=\"https://github.com/khwilliamson\"\u003e@khwilliamson\u003c/a\u003e\u003c/h3\u003e\n\u003cp dir=\"auto\"\u003eOn 06/20/2017 01:58 AM, Dave Mitchell wrote:\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eOn Mon, Jun 19, 2017 at 07:23:10PM -0600, Karl Williamson wrote:\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eIt looks to me that S_grok_bslash_N is passing correct stuff to the error\u003cbr\u003e\nroutines.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eOr maybe it isn't :-)\u003c/p\u003e\n\u003cp dir=\"auto\"\u003evFAIL() is using the \"%\"UTF8f mechanism to pass a (possibly utf8) string\u003cbr\u003e\nbuffer for printing the diagnostic error.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIt uses this:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e#define REPORT_LOCATION_ARGS(xC) \\\u003cbr\u003e\nUTF8fARG(UTF, \\\u003cbr\u003e\n(xI(xC) \u0026gt; eC) /* Don't run off end */ \\\u003cbr\u003e\n? eC - sC /* Length before the \u0026lt;--HERE */ \\\u003cbr\u003e\n: xI_offset(xC), \\\u003cbr\u003e\nsC), /* The input pattern printed up to the \u0026lt;--HERE */ \\\u003cbr\u003e\nUTF8fARG(UTF, \\\u003cbr\u003e\n(xI(xC) \u0026gt; eC) ? 0 : eC - xI(xC), /* Length after \u0026lt;--HERE */ \\\u003cbr\u003e\n(xI(xC) \u0026gt; eC) ? eC : xI(xC)) /* pattern after \u0026lt;--HERE */\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eLooking at the second UTF8fARG,\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eeC expands to: pRExC_state-\u0026gt;precomp_end\u003c/p\u003e\n\u003cp dir=\"auto\"\u003exI(xC) expands to: pRExC_state-\u0026gt;precomp\u003cbr\u003e\n+ ((IV) (pRExC_state-\u0026gt;precomp_adj\u003cbr\u003e\n+ (pRExC_state-\u0026gt;parse - pRExC_state-\u0026gt;adjusted_start)))\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eAt this point I see the following values:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e(gdb) p pRExC_state-\u0026gt;precomp\u003cbr\u003e\n$3 = 0xb30288 \"\\\\N{U+.}\"\u003cbr\u003e\n(gdb) p pRExC_state-\u0026gt;precomp_end\u003cbr\u003e\n$4 = 0xb3028f \"\"\u003cbr\u003e\n(gdb) p pRExC_state-\u0026gt;precomp_adj\u003cbr\u003e\n$7 = 0x0\u003cbr\u003e\n(gdb) p pRExC_state-\u0026gt;parse\u003cbr\u003e\n$8 = 0xb3028e \"}\"\u003cbr\u003e\n(gdb) p pRExC_state-\u0026gt;adjusted_start\u003cbr\u003e\n$9 = 0xb2ef48 \"?:\\\\x{})\"\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIt appears that pRExC_state-\u0026gt;adjusted_start is \"wild\", causing potentially\u003cbr\u003e\nlarge chunks of garbage to be output.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eCan you handle it from here?\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eYes, and thank you for the diagnosis. I have a trivial fix. This is a\u003cbr\u003e\ncase of macros hiding stuff not quite completely, allowing me to forget\u003cbr\u003e\nabout that stuff, but not hiding it enough that it can safely be\u003cbr\u003e\ncompletely forgotten about.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eI will do an audit looking for similar cases in regcomp.c.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe question now is how do we handle this. Since the fix is so trivial,\u003cbr\u003e\nit can be backported to whatever releases we deem doing it to. I don't\u003cbr\u003e\nunderstand what the consequences of this are for an attack.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e(regcomp.c is, to me, a riddle wrapped in\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003ea mystery wrapped in an enigma).\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eThat's how I feel about a bunch of the other core code. (And about the\u003cbr\u003e\nregex optimizer)\u003c/p\u003e","bodyVersion":"72255845a550061fdf8dbe85271f0c620162ced126635433ceb7600ecaf1c9a5","viewerCanUpdate":false,"url":"https://github.com/Perl/perl5/issues/16025#issuecomment-544089711","createdAt":"2017-06-20T16:46:57Z","authorAssociation":"NONE","viewerCanDelete":false,"viewerCanMinimize":false,"viewerCanReport":false,"viewerCanReportToMaintainer":false,"viewerCanBlockFromOrg":false,"viewerCanUnblockFromOrg":false,"isHidden":false,"minimizedReason":null,"showSpammyBadge":false,"createdViaEmail":false,"authorToRepoOwnerSponsorship":null,"repository":{"id":"MDEwOlJlcG9zaXRvcnk4MTgzNTcw","name":"perl5","owner":{"__typename":"Organization","id":"MDEyOk9yZ2FuaXphdGlvbjM1ODU0MTE=","login":"Perl","url":"https://github.com/Perl"},"isPrivate":false,"slashCommandsEnabled":false,"nameWithOwner":"Perl/perl5","databaseId":8183570},"__isComment":"IssueComment","viewerCanReadUserContentEdits":true,"lastEditedAt":null,"lastUserContentEdit":null,"__isReactable":"IssueComment","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"__isNode":"IssueComment"},"cursor":"Y3Vyc29yOnYyOpPPAAABXMZmX-gAqTU0NDA4OTcxMQ=="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":544089712,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"p5pRT","id":"MDQ6VXNlcjUxNzk4MDE4"},"id":"MDU6SXNzdWU1MDkzOTE2NTE=","number":16025,"locked":false,"databaseId":509391651},"author":{"__typename":"User","login":"p5pRT","avatarUrl":"https://avatars.githubusercontent.com/u/51798018?u=c0c9dec90db4d6102e88553f891e56b4bb45370e\u0026v=4","id":"MDQ6VXNlcjUxNzk4MDE4"},"id":"MDEyOklzc3VlQ29tbWVudDU0NDA4OTcxMg==","body":"### From @khwilliamson\n\nOn 06/20/2017 10\u0026#8203;:46 AM\\, Karl Williamson wrote\u0026#8203;:\n\u003e On 06/20/2017 01\u0026#8203;:58 AM\\, Dave Mitchell wrote\u0026#8203;:\n\u003e\u003e On Mon\\, Jun 19\\, 2017 at 07\u0026#8203;:23\u0026#8203;:10PM \\-0600\\, Karl Williamson wrote\u0026#8203;:\n\u003e\u003e\u003e It looks to me that S\\_grok\\_bslash\\_N is passing correct stuff to the \n\u003e\u003e\u003e error\n\u003e\u003e\u003e routines\\.\n\u003e\u003e\n\u003e\u003e Or maybe it isn't :\\-\\)\n\u003e\u003e\n\u003e\u003e vFAIL\\(\\) is using the \"%\"UTF8f mechanism to pass a \\(possibly utf8\\) string\n\u003e\u003e buffer for printing the diagnostic error\\.\n\u003e\u003e\n\u003e\u003e It uses this\u0026#8203;:\n\u003e\u003e\n\u003e\u003e \\#define \n\u003e\u003e REPORT\\_LOCATION\\_ARGS\\(xC\\) \\\\\n\u003e\u003e \n\u003e\u003e UTF8fARG\\(UTF\\, \\\\\n\u003e\u003e \\(xI\\(xC\\) \u003e eC\\) /\\* Don't run off end \n\u003e\u003e \\*/ \\\\\n\u003e\u003e ? eC \\- sC /\\* Length before the \\\u003c\\-\\-HERE \n\u003e\u003e \\*/ \\\\\n\u003e\u003e : \n\u003e\u003e xI\\_offset\\(xC\\)\\, \\\\\n\u003e\u003e sC\\)\\, /\\* The input pattern printed up to the \n\u003e\u003e \\\u003c\\-\\-HERE \\*/ \\\\\n\u003e\u003e \n\u003e\u003e UTF8fARG\\(UTF\\, \\\\\n\u003e\u003e \\(xI\\(xC\\) \u003e eC\\) ? 0 : eC \\- xI\\(xC\\)\\, /\\* Length after \\\u003c\\-\\-HERE \n\u003e\u003e \\*/ \\\\\n\u003e\u003e \\(xI\\(xC\\) \u003e eC\\) ? eC : xI\\(xC\\)\\) /\\* pattern after \n\u003e\u003e \\\u003c\\-\\-HERE \\*/\n\u003e\u003e\n\u003e\u003e Looking at the second UTF8fARG\\,\n\u003e\u003e\n\u003e\u003e eC expands to\u0026#8203;: pRExC\\_state\\-\u003eprecomp\\_end\n\u003e\u003e\n\u003e\u003e xI\\(xC\\) expands to\u0026#8203;: pRExC\\_state\\-\u003eprecomp\n\u003e\u003e \\+ \\(\\(IV\\) \\(pRExC\\_state\\-\u003eprecomp\\_adj\n\u003e\u003e \\+ \\(pRExC\\_state\\-\u003eparse \\- \n\u003e\u003e pRExC\\_state\\-\u003eadjusted\\_start\\)\\)\\)\n\u003e\u003e\n\u003e\u003e\n\u003e\u003e At this point I see the following values\u0026#8203;:\n\u003e\u003e\n\u003e\u003e \\(gdb\\) p pRExC\\_state\\-\u003eprecomp\n\u003e\u003e $3 = 0xb30288 \"\\\\\\\\N\\{U\\+\\.\\}\"\n\u003e\u003e \\(gdb\\) p pRExC\\_state\\-\u003eprecomp\\_end\n\u003e\u003e $4 = 0xb3028f \"\"\n\u003e\u003e \\(gdb\\) p pRExC\\_state\\-\u003eprecomp\\_adj\n\u003e\u003e $7 = 0x0\n\u003e\u003e \\(gdb\\) p pRExC\\_state\\-\u003eparse\n\u003e\u003e $8 = 0xb3028e \"\\}\"\n\u003e\u003e \\(gdb\\) p pRExC\\_state\\-\u003eadjusted\\_start\n\u003e\u003e $9 = 0xb2ef48 \"?\u0026#8203;:\\\\\\\\x\\{\\}\\)\"\n\u003e\u003e\n\u003e\u003e It appears that pRExC\\_state\\-\u003eadjusted\\_start is \"wild\"\\, causing \n\u003e\u003e potentially\n\u003e\u003e large chunks of garbage to be output\\.\n\u003e\u003e\n\u003e\u003e Can you handle it from here? \n\u003e \n\u003e Yes\\, and thank you for the diagnosis\\. I have a trivial fix\\. This is a \n\u003e case of macros hiding stuff not quite completely\\, allowing me to forget \n\u003e about that stuff\\, but not hiding it enough that it can safely be \n\u003e completely forgotten about\\.\n\u003e \n\u003e I will do an audit looking for similar cases in regcomp\\.c\\.\n\nMy audit indicates this is the only problematic case in regcomp\\.c\n\u003e \n\u003e The question now is how do we handle this\\. Since the fix is so trivial\\, \n\u003e it can be backported to whatever releases we deem doing it to\\. I don't \n\u003e understand what the consequences of this are for an attack\\.\n\u003e \n\u003e \\(regcomp\\.c is\\, to me\\, a riddle wrapped in\n\u003e\u003e a mystery wrapped in an enigma\\)\\.\n\u003e \n\u003e That's how I feel about a bunch of the other core code\\. \\(And about the \n\u003e regex optimizer\\)\n\u003e ","bodyHTML":"\u003ch3 dir=\"auto\"\u003eFrom \u003ca class=\"user-mention notranslate\" data-hovercard-type=\"user\" data-hovercard-url=\"/users/khwilliamson/hovercard\" data-octo-click=\"hovercard-link-click\" data-octo-dimensions=\"link_type:self\" href=\"https://github.com/khwilliamson\"\u003e@khwilliamson\u003c/a\u003e\u003c/h3\u003e\n\u003cp dir=\"auto\"\u003eOn 06/20/2017 10:46 AM, Karl Williamson wrote:\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eOn 06/20/2017 01:58 AM, Dave Mitchell wrote:\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eOn Mon, Jun 19, 2017 at 07:23:10PM -0600, Karl Williamson wrote:\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eIt looks to me that S_grok_bslash_N is passing correct stuff to the\u003cbr\u003e\nerror\u003cbr\u003e\nroutines.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eOr maybe it isn't :-)\u003c/p\u003e\n\u003cp dir=\"auto\"\u003evFAIL() is using the \"%\"UTF8f mechanism to pass a (possibly utf8) string\u003cbr\u003e\nbuffer for printing the diagnostic error.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIt uses this:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e#define\u003cbr\u003e\nREPORT_LOCATION_ARGS(xC) \\\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eUTF8fARG(UTF, \\\u003cbr\u003e\n(xI(xC) \u0026gt; eC) /* Don't run off end\u003cbr\u003e\n*/ \\\u003cbr\u003e\n? eC - sC /* Length before the \u0026lt;--HERE\u003cbr\u003e\n*/ \\\u003cbr\u003e\n:\u003cbr\u003e\nxI_offset(xC), \\\u003cbr\u003e\nsC), /* The input pattern printed up to the\u003cbr\u003e\n\u0026lt;--HERE */ \\\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eUTF8fARG(UTF, \\\u003cbr\u003e\n(xI(xC) \u0026gt; eC) ? 0 : eC - xI(xC), /* Length after \u0026lt;--HERE\u003cbr\u003e\n*/ \\\u003cbr\u003e\n(xI(xC) \u0026gt; eC) ? eC : xI(xC)) /* pattern after\u003cbr\u003e\n\u0026lt;--HERE */\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eLooking at the second UTF8fARG,\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eeC expands to: pRExC_state-\u0026gt;precomp_end\u003c/p\u003e\n\u003cp dir=\"auto\"\u003exI(xC) expands to: pRExC_state-\u0026gt;precomp\u003cbr\u003e\n+ ((IV) (pRExC_state-\u0026gt;precomp_adj\u003cbr\u003e\n+ (pRExC_state-\u0026gt;parse -\u003cbr\u003e\npRExC_state-\u0026gt;adjusted_start)))\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eAt this point I see the following values:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e(gdb) p pRExC_state-\u0026gt;precomp\u003cbr\u003e\n$3 = 0xb30288 \"\\\\N{U+.}\"\u003cbr\u003e\n(gdb) p pRExC_state-\u0026gt;precomp_end\u003cbr\u003e\n$4 = 0xb3028f \"\"\u003cbr\u003e\n(gdb) p pRExC_state-\u0026gt;precomp_adj\u003cbr\u003e\n$7 = 0x0\u003cbr\u003e\n(gdb) p pRExC_state-\u0026gt;parse\u003cbr\u003e\n$8 = 0xb3028e \"}\"\u003cbr\u003e\n(gdb) p pRExC_state-\u0026gt;adjusted_start\u003cbr\u003e\n$9 = 0xb2ef48 \"?:\\\\x{})\"\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIt appears that pRExC_state-\u0026gt;adjusted_start is \"wild\", causing\u003cbr\u003e\npotentially\u003cbr\u003e\nlarge chunks of garbage to be output.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eCan you handle it from here?\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eYes, and thank you for the diagnosis. I have a trivial fix. This is a\u003cbr\u003e\ncase of macros hiding stuff not quite completely, allowing me to forget\u003cbr\u003e\nabout that stuff, but not hiding it enough that it can safely be\u003cbr\u003e\ncompletely forgotten about.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eI will do an audit looking for similar cases in regcomp.c.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eMy audit indicates this is the only problematic case in regcomp.c\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eThe question now is how do we handle this. Since the fix is so trivial,\u003cbr\u003e\nit can be backported to whatever releases we deem doing it to. I don't\u003cbr\u003e\nunderstand what the consequences of this are for an attack.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e(regcomp.c is, to me, a riddle wrapped in\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003ea mystery wrapped in an enigma).\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eThat's how I feel about a bunch of the other core code. (And about the\u003cbr\u003e\nregex optimizer)\u003c/p\u003e\n\u003c/blockquote\u003e","bodyVersion":"8d3c70a2d90e25abc26465701ab83dd7cdaa08b83486bbe9a043f2bc4a215131","viewerCanUpdate":false,"url":"https://github.com/Perl/perl5/issues/16025#issuecomment-544089712","createdAt":"2017-06-20T21:46:22Z","authorAssociation":"NONE","viewerCanDelete":false,"viewerCanMinimize":false,"viewerCanReport":false,"viewerCanReportToMaintainer":false,"viewerCanBlockFromOrg":false,"viewerCanUnblockFromOrg":false,"isHidden":false,"minimizedReason":null,"showSpammyBadge":false,"createdViaEmail":false,"authorToRepoOwnerSponsorship":null,"repository":{"id":"MDEwOlJlcG9zaXRvcnk4MTgzNTcw","name":"perl5","owner":{"__typename":"Organization","id":"MDEyOk9yZ2FuaXphdGlvbjM1ODU0MTE=","login":"Perl","url":"https://github.com/Perl"},"isPrivate":false,"slashCommandsEnabled":false,"nameWithOwner":"Perl/perl5","databaseId":8183570},"__isComment":"IssueComment","viewerCanReadUserContentEdits":true,"lastEditedAt":null,"lastUserContentEdit":null,"__isReactable":"IssueComment","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"__isNode":"IssueComment"},"cursor":"Y3Vyc29yOnYyOpPPAAABXMd4f7AAqTU0NDA4OTcxMg=="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":544089713,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"p5pRT","id":"MDQ6VXNlcjUxNzk4MDE4"},"id":"MDU6SXNzdWU1MDkzOTE2NTE=","number":16025,"locked":false,"databaseId":509391651},"author":{"__typename":"User","login":"p5pRT","avatarUrl":"https://avatars.githubusercontent.com/u/51798018?u=c0c9dec90db4d6102e88553f891e56b4bb45370e\u0026v=4","id":"MDQ6VXNlcjUxNzk4MDE4"},"id":"MDEyOklzc3VlQ29tbWVudDU0NDA4OTcxMw==","body":"### From @iabyn\n\nOn Tue\\, Jun 20\\, 2017 at 10\u0026#8203;:46\u0026#8203;:34AM \\-0600\\, Karl Williamson wrote\u0026#8203;:\n\u003e The question now is how do we handle this\\. Since the fix is so trivial\\, it\n\u003e can be backported to whatever releases we deem doing it to\\. I don't\n\u003e understand what the consequences of this are for an attack\\.\n\nIt seems that for certain types of syntax error in a pattern\\,\nthe error message will either contain the contents of random\\, possibly\nlarge\\, chunk of memory\\(\\*\\)\\, or will SEGV\\.\n\nSo if an attacker can control the pattern\\, they make be able to DoS\\, fill\nup log files\\, or potentially expose sensitive data containing in the\nprocess's address space\\.\n\nI think the last one is least likely \\- for example if a web page accepted\na regex search expression\\, the error message would go the log file rather\nthan back to the browser\\.\n\nPersonally I think we we just fix it in blead\\, backport in the normal\ncourse of affairs\\, and CVE etc\\.\n\n\\(\\*\\) you probably have a better idea than me about how much memory could be\nexposed based on the specifics of the \"wildness\" of that pointer\\.\n\n\\-\\- \nNever work with children\\, animals\\, or actors\\.","bodyHTML":"\u003ch3 dir=\"auto\"\u003eFrom \u003ca class=\"user-mention notranslate\" data-hovercard-type=\"user\" data-hovercard-url=\"/users/iabyn/hovercard\" data-octo-click=\"hovercard-link-click\" data-octo-dimensions=\"link_type:self\" href=\"https://github.com/iabyn\"\u003e@iabyn\u003c/a\u003e\u003c/h3\u003e\n\u003cp dir=\"auto\"\u003eOn Tue, Jun 20, 2017 at 10:46:34AM -0600, Karl Williamson wrote:\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eThe question now is how do we handle this. Since the fix is so trivial, it\u003cbr\u003e\ncan be backported to whatever releases we deem doing it to. I don't\u003cbr\u003e\nunderstand what the consequences of this are for an attack.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eIt seems that for certain types of syntax error in a pattern,\u003cbr\u003e\nthe error message will either contain the contents of random, possibly\u003cbr\u003e\nlarge, chunk of memory(*), or will SEGV.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eSo if an attacker can control the pattern, they make be able to DoS, fill\u003cbr\u003e\nup log files, or potentially expose sensitive data containing in the\u003cbr\u003e\nprocess's address space.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eI think the last one is least likely - for example if a web page accepted\u003cbr\u003e\na regex search expression, the error message would go the log file rather\u003cbr\u003e\nthan back to the browser.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003ePersonally I think we we just fix it in blead, backport in the normal\u003cbr\u003e\ncourse of affairs, and CVE etc.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e(*) you probably have a better idea than me about how much memory could be\u003cbr\u003e\nexposed based on the specifics of the \"wildness\" of that pointer.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e--\u003cbr\u003e\nNever work with children, animals, or actors.\u003c/p\u003e","bodyVersion":"cdc8d63a0f8bb867438c6fc32d91ab5f94f0b00f7c44af7eafe5510f6d219dc3","viewerCanUpdate":false,"url":"https://github.com/Perl/perl5/issues/16025#issuecomment-544089713","createdAt":"2017-06-21T12:03:28Z","authorAssociation":"NONE","viewerCanDelete":false,"viewerCanMinimize":false,"viewerCanReport":false,"viewerCanReportToMaintainer":false,"viewerCanBlockFromOrg":false,"viewerCanUnblockFromOrg":false,"isHidden":false,"minimizedReason":null,"showSpammyBadge":false,"createdViaEmail":false,"authorToRepoOwnerSponsorship":null,"repository":{"id":"MDEwOlJlcG9zaXRvcnk4MTgzNTcw","name":"perl5","owner":{"__typename":"Organization","id":"MDEyOk9yZ2FuaXphdGlvbjM1ODU0MTE=","login":"Perl","url":"https://github.com/Perl"},"isPrivate":false,"slashCommandsEnabled":false,"nameWithOwner":"Perl/perl5","databaseId":8183570},"__isComment":"IssueComment","viewerCanReadUserContentEdits":true,"lastEditedAt":null,"lastUserContentEdit":null,"__isReactable":"IssueComment","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"__isNode":"IssueComment"},"cursor":"Y3Vyc29yOnYyOpPPAAABXMqJMoAAqTU0NDA4OTcxMw=="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":544089714,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"p5pRT","id":"MDQ6VXNlcjUxNzk4MDE4"},"id":"MDU6SXNzdWU1MDkzOTE2NTE=","number":16025,"locked":false,"databaseId":509391651},"author":{"__typename":"User","login":"p5pRT","avatarUrl":"https://avatars.githubusercontent.com/u/51798018?u=c0c9dec90db4d6102e88553f891e56b4bb45370e\u0026v=4","id":"MDQ6VXNlcjUxNzk4MDE4"},"id":"MDEyOklzc3VlQ29tbWVudDU0NDA4OTcxNA==","body":"### From @jwilk\n\n\\* Dave Mitchell\\, 2017\\-06\\-21\\, 05\u0026#8203;:03\u0026#8203;:\n\u003eSo if an attacker can control the pattern\\, they make be able to DoS\\, fill up \n\u003elog files\\, or potentially expose sensitive data containing in the process's \n\u003eaddress space\\.\n\u003e\n\u003eI think the last one is least likely \\- for example if a web page accepted a \n\u003eregex search expression\\, the error message would go the log file rather than \n\u003eback to the browser\\.\n\nIt's a bad user experience if the search engine tells you that your query is \nwrong\\, but it doesn't tell you why\\.\n\nSo for the implementer\\, it makes sense to wrap regex compilation in eval\\{\\} and \nsend $@\u0026#8203; back to the user when compilation fails\\.\n\n\\-\\- \nJakub Wilk","bodyHTML":"\u003ch3 dir=\"auto\"\u003eFrom \u003ca class=\"user-mention notranslate\" data-hovercard-type=\"user\" data-hovercard-url=\"/users/jwilk/hovercard\" data-octo-click=\"hovercard-link-click\" data-octo-dimensions=\"link_type:self\" href=\"https://github.com/jwilk\"\u003e@jwilk\u003c/a\u003e\u003c/h3\u003e\n\u003cp dir=\"auto\"\u003e* Dave Mitchell, 2017-06-21, 05:03:\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eSo if an attacker can control the pattern, they make be able to DoS, fill up\u003cbr\u003e\nlog files, or potentially expose sensitive data containing in the process's\u003cbr\u003e\naddress space.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eI think the last one is least likely - for example if a web page accepted a\u003cbr\u003e\nregex search expression, the error message would go the log file rather than\u003cbr\u003e\nback to the browser.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eIt's a bad user experience if the search engine tells you that your query is\u003cbr\u003e\nwrong, but it doesn't tell you why.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eSo for the implementer, it makes sense to wrap regex compilation in eval{} and\u003cbr\u003e\nsend $@ back to the user when compilation fails.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e--\u003cbr\u003e\nJakub Wilk\u003c/p\u003e","bodyVersion":"60ec5b771536935dfc1ff956b6cea40d562903a3587644bcb0615ab957dca739","viewerCanUpdate":false,"url":"https://github.com/Perl/perl5/issues/16025#issuecomment-544089714","createdAt":"2017-06-21T13:33:45Z","authorAssociation":"NONE","viewerCanDelete":false,"viewerCanMinimize":false,"viewerCanReport":false,"viewerCanReportToMaintainer":false,"viewerCanBlockFromOrg":false,"viewerCanUnblockFromOrg":false,"isHidden":false,"minimizedReason":null,"showSpammyBadge":false,"createdViaEmail":false,"authorToRepoOwnerSponsorship":null,"repository":{"id":"MDEwOlJlcG9zaXRvcnk4MTgzNTcw","name":"perl5","owner":{"__typename":"Organization","id":"MDEyOk9yZ2FuaXphdGlvbjM1ODU0MTE=","login":"Perl","url":"https://github.com/Perl"},"isPrivate":false,"slashCommandsEnabled":false,"nameWithOwner":"Perl/perl5","databaseId":8183570},"__isComment":"IssueComment","viewerCanReadUserContentEdits":true,"lastEditedAt":null,"lastUserContentEdit":null,"__isReactable":"IssueComment","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"__isNode":"IssueComment"},"cursor":"Y3Vyc29yOnYyOpPPAAABXMrb2qgAqTU0NDA4OTcxNA=="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":544089716,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"p5pRT","id":"MDQ6VXNlcjUxNzk4MDE4"},"id":"MDU6SXNzdWU1MDkzOTE2NTE=","number":16025,"locked":false,"databaseId":509391651},"author":{"__typename":"User","login":"p5pRT","avatarUrl":"https://avatars.githubusercontent.com/u/51798018?u=c0c9dec90db4d6102e88553f891e56b4bb45370e\u0026v=4","id":"MDQ6VXNlcjUxNzk4MDE4"},"id":"MDEyOklzc3VlQ29tbWVudDU0NDA4OTcxNg==","body":"### From @khwilliamson\n\nOn 06/21/2017 06\u0026#8203;:02 AM\\, Dave Mitchell wrote\u0026#8203;:\n\u003e On Tue\\, Jun 20\\, 2017 at 10\u0026#8203;:46\u0026#8203;:34AM \\-0600\\, Karl Williamson wrote\u0026#8203;:\n\u003e\u003e The question now is how do we handle this\\. Since the fix is so trivial\\, it\n\u003e\u003e can be backported to whatever releases we deem doing it to\\. I don't\n\u003e\u003e understand what the consequences of this are for an attack\\.\n\u003e \n\u003e It seems that for certain types of syntax error in a pattern\\,\n\u003e the error message will either contain the contents of random\\, possibly\n\u003e large\\, chunk of memory\\(\\*\\)\\, or will SEGV\\.\n\nThe particular error happens only if someone has a single quotish \npattern that contains precisely this sequence\n\n\\\\N\\{U\\+\\.\\}\n\nIn raising a fatal error\\, there is a wild pointer\\. I believe that \nshould point to a copy of a portion of the pattern\\. The problem is the \nlength is wild\\, and depends on where libc allocated this space which \ncame from a newSV\\(\\) call\\.\n\n\n\u003e \n\u003e So if an attacker can control the pattern\\, they make be able to DoS\\, fill\n\u003e up log files\\, or potentially expose sensitive data containing in the\n\u003e process's address space\\.\n\u003e \n\u003e I think the last one is least likely \\- for example if a web page accepted\n\u003e a regex search expression\\, the error message would go the log file rather\n\u003e than back to the browser\\.\n\u003e \n\u003e Personally I think we we just fix it in blead\\, backport in the normal\n\u003e course of affairs\\, and CVE etc\\.\n\nI don't understand\\. I thought one wanted to synchronize things so the \npatch isn't disclosed until all releases are ready\\, at the same time as \nthe CVE\\.\n\u003e \n\u003e \\(\\*\\) you probably have a better idea than me about how much memory could be\n\u003e exposed based on the specifics of the \"wildness\" of that pointer\\.\n\u003e ","bodyHTML":"\u003ch3 dir=\"auto\"\u003eFrom \u003ca class=\"user-mention notranslate\" data-hovercard-type=\"user\" data-hovercard-url=\"/users/khwilliamson/hovercard\" data-octo-click=\"hovercard-link-click\" data-octo-dimensions=\"link_type:self\" href=\"https://github.com/khwilliamson\"\u003e@khwilliamson\u003c/a\u003e\u003c/h3\u003e\n\u003cp dir=\"auto\"\u003eOn 06/21/2017 06:02 AM, Dave Mitchell wrote:\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eOn Tue, Jun 20, 2017 at 10:46:34AM -0600, Karl Williamson wrote:\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eThe question now is how do we handle this. Since the fix is so trivial, it\u003cbr\u003e\ncan be backported to whatever releases we deem doing it to. I don't\u003cbr\u003e\nunderstand what the consequences of this are for an attack.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eIt seems that for certain types of syntax error in a pattern,\u003cbr\u003e\nthe error message will either contain the contents of random, possibly\u003cbr\u003e\nlarge, chunk of memory(*), or will SEGV.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eThe particular error happens only if someone has a single quotish\u003cbr\u003e\npattern that contains precisely this sequence\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\\N{U+.}\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIn raising a fatal error, there is a wild pointer. I believe that\u003cbr\u003e\nshould point to a copy of a portion of the pattern. The problem is the\u003cbr\u003e\nlength is wild, and depends on where libc allocated this space which\u003cbr\u003e\ncame from a newSV() call.\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eSo if an attacker can control the pattern, they make be able to DoS, fill\u003cbr\u003e\nup log files, or potentially expose sensitive data containing in the\u003cbr\u003e\nprocess's address space.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eI think the last one is least likely - for example if a web page accepted\u003cbr\u003e\na regex search expression, the error message would go the log file rather\u003cbr\u003e\nthan back to the browser.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003ePersonally I think we we just fix it in blead, backport in the normal\u003cbr\u003e\ncourse of affairs, and CVE etc.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eI don't understand. I thought one wanted to synchronize things so the\u003cbr\u003e\npatch isn't disclosed until all releases are ready, at the same time as\u003cbr\u003e\nthe CVE.\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003e(*) you probably have a better idea than me about how much memory could be\u003cbr\u003e\nexposed based on the specifics of the \"wildness\" of that pointer.\u003c/p\u003e\n\u003c/blockquote\u003e","bodyVersion":"389535ae2a2adffa571cf775596712810d425b46bbac1ab5b5020efa8859a7c1","viewerCanUpdate":false,"url":"https://github.com/Perl/perl5/issues/16025#issuecomment-544089716","createdAt":"2017-06-22T04:15:51Z","authorAssociation":"NONE","viewerCanDelete":false,"viewerCanMinimize":false,"viewerCanReport":false,"viewerCanReportToMaintainer":false,"viewerCanBlockFromOrg":false,"viewerCanUnblockFromOrg":false,"isHidden":false,"minimizedReason":null,"showSpammyBadge":false,"createdViaEmail":false,"authorToRepoOwnerSponsorship":null,"repository":{"id":"MDEwOlJlcG9zaXRvcnk4MTgzNTcw","name":"perl5","owner":{"__typename":"Organization","id":"MDEyOk9yZ2FuaXphdGlvbjM1ODU0MTE=","login":"Perl","url":"https://github.com/Perl"},"isPrivate":false,"slashCommandsEnabled":false,"nameWithOwner":"Perl/perl5","databaseId":8183570},"__isComment":"IssueComment","viewerCanReadUserContentEdits":true,"lastEditedAt":null,"lastUserContentEdit":null,"__isReactable":"IssueComment","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"__isNode":"IssueComment"},"cursor":"Y3Vyc29yOnYyOpPPAAABXM4DcNgAqTU0NDA4OTcxNg=="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":544089717,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"p5pRT","id":"MDQ6VXNlcjUxNzk4MDE4"},"id":"MDU6SXNzdWU1MDkzOTE2NTE=","number":16025,"locked":false,"databaseId":509391651},"author":{"__typename":"User","login":"p5pRT","avatarUrl":"https://avatars.githubusercontent.com/u/51798018?u=c0c9dec90db4d6102e88553f891e56b4bb45370e\u0026v=4","id":"MDQ6VXNlcjUxNzk4MDE4"},"id":"MDEyOklzc3VlQ29tbWVudDU0NDA4OTcxNw==","body":"### From @iabyn\n\nOn Wed\\, Jun 21\\, 2017 at 10\u0026#8203;:15\u0026#8203;:19PM \\-0600\\, Karl Williamson wrote\u0026#8203;:\n\u003e On 06/21/2017 06\u0026#8203;:02 AM\\, Dave Mitchell wrote\u0026#8203;:\n\u003e In raising a fatal error\\, there is a wild pointer\\. I believe that should\n\u003e point to a copy of a portion of the pattern\\. The problem is the length is\n\u003e wild\\, and depends on where libc allocated this space which came from a\n\u003e newSV\\(\\) call\\.\n\nSo it sounds like it has the potential to dump an random large\nchunk of memory\\.\n\u003e \u003e Personally I think we we just fix it in blead\\, backport in the normal\n\u003e \u003e course of affairs\\, and CVE etc\\.\n\u003e \n\u003e I don't understand\\. I thought one wanted to synchronize things so the patch\n\u003e isn't disclosed until all releases are ready\\, at the same time as the CVE\\.\n\nI meant to say \"and no CVE etc\"\\, although the OP's comment about web\nserver code accepting a pattern string\\, compiling it under eval \\{\\} then\nreturning $@\u0026#8203; to the browser perhaps pushes this into CVE territory\\.\n\n\\-\\- \nPlease note that ash\\-trays are provided for the use of smokers\\,\nwhereas the floor is provided for the use of all patrons\\.\n\u0026nbsp; \\-\\- Bill Royston","bodyHTML":"\u003ch3 dir=\"auto\"\u003eFrom \u003ca class=\"user-mention notranslate\" data-hovercard-type=\"user\" data-hovercard-url=\"/users/iabyn/hovercard\" data-octo-click=\"hovercard-link-click\" data-octo-dimensions=\"link_type:self\" href=\"https://github.com/iabyn\"\u003e@iabyn\u003c/a\u003e\u003c/h3\u003e\n\u003cp dir=\"auto\"\u003eOn Wed, Jun 21, 2017 at 10:15:19PM -0600, Karl Williamson wrote:\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eOn 06/21/2017 06:02 AM, Dave Mitchell wrote:\u003cbr\u003e\nIn raising a fatal error, there is a wild pointer. I believe that should\u003cbr\u003e\npoint to a copy of a portion of the pattern. The problem is the length is\u003cbr\u003e\nwild, and depends on where libc allocated this space which came from a\u003cbr\u003e\nnewSV() call.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eSo it sounds like it has the potential to dump an random large\u003cbr\u003e\nchunk of memory.\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003ePersonally I think we we just fix it in blead, backport in the normal\u003cbr\u003e\ncourse of affairs, and CVE etc.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eI don't understand. I thought one wanted to synchronize things so the patch\u003cbr\u003e\nisn't disclosed until all releases are ready, at the same time as the CVE.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eI meant to say \"and no CVE etc\", although the OP's comment about web\u003cbr\u003e\nserver code accepting a pattern string, compiling it under eval {} then\u003cbr\u003e\nreturning $@ to the browser perhaps pushes this into CVE territory.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e--\u003cbr\u003e\nPlease note that ash-trays are provided for the use of smokers,\u003cbr\u003e\nwhereas the floor is provided for the use of all patrons.\u003cbr\u003e\n -- Bill Royston\u003c/p\u003e","bodyVersion":"a96ed1a7d314b8ef16aa8e1b85f6949ed8692197f63cc563e1529b7dd989449b","viewerCanUpdate":false,"url":"https://github.com/Perl/perl5/issues/16025#issuecomment-544089717","createdAt":"2017-06-22T09:31:40Z","authorAssociation":"NONE","viewerCanDelete":false,"viewerCanMinimize":false,"viewerCanReport":false,"viewerCanReportToMaintainer":false,"viewerCanBlockFromOrg":false,"viewerCanUnblockFromOrg":false,"isHidden":false,"minimizedReason":null,"showSpammyBadge":false,"createdViaEmail":false,"authorToRepoOwnerSponsorship":null,"repository":{"id":"MDEwOlJlcG9zaXRvcnk4MTgzNTcw","name":"perl5","owner":{"__typename":"Organization","id":"MDEyOk9yZ2FuaXphdGlvbjM1ODU0MTE=","login":"Perl","url":"https://github.com/Perl"},"isPrivate":false,"slashCommandsEnabled":false,"nameWithOwner":"Perl/perl5","databaseId":8183570},"__isComment":"IssueComment","viewerCanReadUserContentEdits":true,"lastEditedAt":null,"lastUserContentEdit":null,"__isReactable":"IssueComment","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"__isNode":"IssueComment"},"cursor":"Y3Vyc29yOnYyOpPPAAABXM8klGAAqTU0NDA4OTcxNw=="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":544089718,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"p5pRT","id":"MDQ6VXNlcjUxNzk4MDE4"},"id":"MDU6SXNzdWU1MDkzOTE2NTE=","number":16025,"locked":false,"databaseId":509391651},"author":{"__typename":"User","login":"p5pRT","avatarUrl":"https://avatars.githubusercontent.com/u/51798018?u=c0c9dec90db4d6102e88553f891e56b4bb45370e\u0026v=4","id":"MDQ6VXNlcjUxNzk4MDE4"},"id":"MDEyOklzc3VlQ29tbWVudDU0NDA4OTcxOA==","body":"### From @khwilliamson\n\nOn 06/22/2017 03\u0026#8203;:31 AM\\, Dave Mitchell wrote\u0026#8203;:\n\u003e On Wed\\, Jun 21\\, 2017 at 10\u0026#8203;:15\u0026#8203;:19PM \\-0600\\, Karl Williamson wrote\u0026#8203;:\n\u003e\u003e On 06/21/2017 06\u0026#8203;:02 AM\\, Dave Mitchell wrote\u0026#8203;:\n\u003e\u003e In raising a fatal error\\, there is a wild pointer\\. I believe that should\n\u003e\u003e point to a copy of a portion of the pattern\\. The problem is the length is\n\u003e\u003e wild\\, and depends on where libc allocated this space which came from a\n\u003e\u003e newSV\\(\\) call\\.\n\u003e \n\u003e So it sounds like it has the potential to dump an random large\n\u003e chunk of memory\\.\n\u003e\u003e\u003e Personally I think we we just fix it in blead\\, backport in the normal\n\u003e\u003e\u003e course of affairs\\, and CVE etc\\.\n\u003e\u003e\n\u003e\u003e I don't understand\\. I thought one wanted to synchronize things so the patch\n\u003e\u003e isn't disclosed until all releases are ready\\, at the same time as the CVE\\.\n\u003e \n\u003e I meant to say \"and no CVE etc\"\\, although the OP's comment about web\n\u003e server code accepting a pattern string\\, compiling it under eval \\{\\} then\n\u003e returning $@\u0026#8203; to the browser perhaps pushes this into CVE territory\\.\n\u003e \n\nFWIW\\, at dmq's suggestion at the core hackathon\\, I have code in the \npipeline for 5\\.27 that makes this moot\\. But there is a trivial fix \navailable for 5\\.26\\.1 and previous maintenance releases\\.\n\nI pinged sawyer about your idea of combining this and 131582\\. I could \ndo some more investigation about the actual consequences","bodyHTML":"\u003ch3 dir=\"auto\"\u003eFrom \u003ca class=\"user-mention notranslate\" data-hovercard-type=\"user\" data-hovercard-url=\"/users/khwilliamson/hovercard\" data-octo-click=\"hovercard-link-click\" data-octo-dimensions=\"link_type:self\" href=\"https://github.com/khwilliamson\"\u003e@khwilliamson\u003c/a\u003e\u003c/h3\u003e\n\u003cp dir=\"auto\"\u003eOn 06/22/2017 03:31 AM, Dave Mitchell wrote:\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eOn Wed, Jun 21, 2017 at 10:15:19PM -0600, Karl Williamson wrote:\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eOn 06/21/2017 06:02 AM, Dave Mitchell wrote:\u003cbr\u003e\nIn raising a fatal error, there is a wild pointer. I believe that should\u003cbr\u003e\npoint to a copy of a portion of the pattern. The problem is the length is\u003cbr\u003e\nwild, and depends on where libc allocated this space which came from a\u003cbr\u003e\nnewSV() call.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eSo it sounds like it has the potential to dump an random large\u003cbr\u003e\nchunk of memory.\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003ePersonally I think we we just fix it in blead, backport in the normal\u003cbr\u003e\ncourse of affairs, and CVE etc.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eI don't understand. I thought one wanted to synchronize things so the patch\u003cbr\u003e\nisn't disclosed until all releases are ready, at the same time as the CVE.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eI meant to say \"and no CVE etc\", although the OP's comment about web\u003cbr\u003e\nserver code accepting a pattern string, compiling it under eval {} then\u003cbr\u003e\nreturning $@ to the browser perhaps pushes this into CVE territory.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eFWIW, at dmq's suggestion at the core hackathon, I have code in the\u003cbr\u003e\npipeline for 5.27 that makes this moot. But there is a trivial fix\u003cbr\u003e\navailable for 5.26.1 and previous maintenance releases.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eI pinged sawyer about your idea of combining this and 131582. I could\u003cbr\u003e\ndo some more investigation about the actual consequences\u003c/p\u003e","bodyVersion":"2e8960c52edd48b0f21d09d45b25dc2c73a5962e943a7063ce29175f81fe8f42","viewerCanUpdate":false,"url":"https://github.com/Perl/perl5/issues/16025#issuecomment-544089718","createdAt":"2017-07-11T03:37:20Z","authorAssociation":"NONE","viewerCanDelete":false,"viewerCanMinimize":false,"viewerCanReport":false,"viewerCanReportToMaintainer":false,"viewerCanBlockFromOrg":false,"viewerCanUnblockFromOrg":false,"isHidden":false,"minimizedReason":null,"showSpammyBadge":false,"createdViaEmail":false,"authorToRepoOwnerSponsorship":null,"repository":{"id":"MDEwOlJlcG9zaXRvcnk4MTgzNTcw","name":"perl5","owner":{"__typename":"Organization","id":"MDEyOk9yZ2FuaXphdGlvbjM1ODU0MTE=","login":"Perl","url":"https://github.com/Perl"},"isPrivate":false,"slashCommandsEnabled":false,"nameWithOwner":"Perl/perl5","databaseId":8183570},"__isComment":"IssueComment","viewerCanReadUserContentEdits":true,"lastEditedAt":null,"lastUserContentEdit":null,"__isReactable":"IssueComment","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"__isNode":"IssueComment"},"cursor":"Y3Vyc29yOnYyOpPPAAABXS-5AYAAqTU0NDA4OTcxOA=="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":544089719,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"p5pRT","id":"MDQ6VXNlcjUxNzk4MDE4"},"id":"MDU6SXNzdWU1MDkzOTE2NTE=","number":16025,"locked":false,"databaseId":509391651},"author":{"__typename":"User","login":"p5pRT","avatarUrl":"https://avatars.githubusercontent.com/u/51798018?u=c0c9dec90db4d6102e88553f891e56b4bb45370e\u0026v=4","id":"MDQ6VXNlcjUxNzk4MDE4"},"id":"MDEyOklzc3VlQ29tbWVudDU0NDA4OTcxOQ==","body":"### From @tonycoz\n\nOn Wed\\, 21 Jun 2017 21\u0026#8203;:15\u0026#8203;:51 \\-0700\\, public@\u0026#8203;khwilliamson\\.com wrote\u0026#8203;:\n\u003e On 06/21/2017 06\u0026#8203;:02 AM\\, Dave Mitchell wrote\u0026#8203;:\n\u003e \u003e On Tue\\, Jun 20\\, 2017 at 10\u0026#8203;:46\u0026#8203;:34AM \\-0600\\, Karl Williamson wrote\u0026#8203;:\n\u003e \u003e\u003e The question now is how do we handle this\\. Since the fix is so\n\u003e \u003e\u003e trivial\\, it\n\u003e \u003e\u003e can be backported to whatever releases we deem doing it to\\. I don't\n\u003e \u003e\u003e understand what the consequences of this are for an attack\\.\n\u003e \u003e\n\u003e \u003e It seems that for certain types of syntax error in a pattern\\,\n\u003e \u003e the error message will either contain the contents of random\\,\n\u003e \u003e possibly\n\u003e \u003e large\\, chunk of memory\\(\\*\\)\\, or will SEGV\\.\n\u003e \n\u003e The particular error happens only if someone has a single quotish\n\u003e pattern that contains precisely this sequence\n\u003e \n\u003e \\\\N\\{U\\+\\.\\}\n\u003e \n\u003e In raising a fatal error\\, there is a wild pointer\\. I believe that\n\u003e should point to a copy of a portion of the pattern\\. The problem is\n\u003e the\n\u003e length is wild\\, and depends on where libc allocated this space which\n\u003e came from a newSV\\(\\) call\\.\n\nIf this only happens for single\\-quotish patterns\\, then this isn't a security issue\\, since single quotish patterns don't do interpolation\\.\n\nI wasn't able to reproduce it \\(but I only tested on x64\\)\\.\n\nCan it happen in other cases\\, like\u0026#8203;:\n\n\u0026nbsp; $x = \"\\\\\\\\N\\{U\\+\\.\\}\";\n\u0026nbsp; $foo =~ $x\n\n?\n\nTony","bodyHTML":"\u003ch3 dir=\"auto\"\u003eFrom \u003ca class=\"user-mention notranslate\" data-hovercard-type=\"user\" data-hovercard-url=\"/users/tonycoz/hovercard\" data-octo-click=\"hovercard-link-click\" data-octo-dimensions=\"link_type:self\" href=\"https://github.com/tonycoz\"\u003e@tonycoz\u003c/a\u003e\u003c/h3\u003e\n\u003cp dir=\"auto\"\u003eOn Wed, 21 Jun 2017 21:15:51 -0700, public@khwilliamson.com wrote:\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eOn 06/21/2017 06:02 AM, Dave Mitchell wrote:\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eOn Tue, Jun 20, 2017 at 10:46:34AM -0600, Karl Williamson wrote:\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eThe question now is how do we handle this. Since the fix is so\u003cbr\u003e\ntrivial, it\u003cbr\u003e\ncan be backported to whatever releases we deem doing it to. I don't\u003cbr\u003e\nunderstand what the consequences of this are for an attack.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eIt seems that for certain types of syntax error in a pattern,\u003cbr\u003e\nthe error message will either contain the contents of random,\u003cbr\u003e\npossibly\u003cbr\u003e\nlarge, chunk of memory(*), or will SEGV.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eThe particular error happens only if someone has a single quotish\u003cbr\u003e\npattern that contains precisely this sequence\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\\N{U+.}\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIn raising a fatal error, there is a wild pointer. I believe that\u003cbr\u003e\nshould point to a copy of a portion of the pattern. The problem is\u003cbr\u003e\nthe\u003cbr\u003e\nlength is wild, and depends on where libc allocated this space which\u003cbr\u003e\ncame from a newSV() call.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eIf this only happens for single-quotish patterns, then this isn't a security issue, since single quotish patterns don't do interpolation.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eI wasn't able to reproduce it (but I only tested on x64).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eCan it happen in other cases, like:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e $x = \"\\\\N{U+.}\";\u003cbr\u003e\n $foo =~ $x\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e?\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eTony\u003c/p\u003e","bodyVersion":"ef47eadd741305e3f2e13b06ad9fc858c86a1fd4e2c7f778267ef2b5b7b67675","viewerCanUpdate":false,"url":"https://github.com/Perl/perl5/issues/16025#issuecomment-544089719","createdAt":"2017-08-11T09:30:04Z","authorAssociation":"NONE","viewerCanDelete":false,"viewerCanMinimize":false,"viewerCanReport":false,"viewerCanReportToMaintainer":false,"viewerCanBlockFromOrg":false,"viewerCanUnblockFromOrg":false,"isHidden":false,"minimizedReason":null,"showSpammyBadge":false,"createdViaEmail":false,"authorToRepoOwnerSponsorship":null,"repository":{"id":"MDEwOlJlcG9zaXRvcnk4MTgzNTcw","name":"perl5","owner":{"__typename":"Organization","id":"MDEyOk9yZ2FuaXphdGlvbjM1ODU0MTE=","login":"Perl","url":"https://github.com/Perl"},"isPrivate":false,"slashCommandsEnabled":false,"nameWithOwner":"Perl/perl5","databaseId":8183570},"__isComment":"IssueComment","viewerCanReadUserContentEdits":true,"lastEditedAt":null,"lastUserContentEdit":null,"__isReactable":"IssueComment","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"__isNode":"IssueComment"},"cursor":"Y3Vyc29yOnYyOpPPAAABXdChFWAAqTU0NDA4OTcxOQ=="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":544089720,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"p5pRT","id":"MDQ6VXNlcjUxNzk4MDE4"},"id":"MDU6SXNzdWU1MDkzOTE2NTE=","number":16025,"locked":false,"databaseId":509391651},"author":{"__typename":"User","login":"p5pRT","avatarUrl":"https://avatars.githubusercontent.com/u/51798018?u=c0c9dec90db4d6102e88553f891e56b4bb45370e\u0026v=4","id":"MDQ6VXNlcjUxNzk4MDE4"},"id":"MDEyOklzc3VlQ29tbWVudDU0NDA4OTcyMA==","body":"### From @jwilk\n\n\\* Tony Cook via RT \\\u003cperl5\\-security\\-report@\u0026#8203;perl\\.org\u003e\\, 2017\\-08\\-11\\, 02\u0026#8203;:30\u0026#8203;:\n\u003eIf this only happens for single\\-quotish patterns\\, then this isn't a security \n\u003eissue\\, since single quotish patterns don't do interpolation\\.\n\u003e\n\u003eI wasn't able to reproduce it \\(but I only tested on x64\\)\\.\n\u003e\n\u003eCan it happen in other cases\\, like\u0026#8203;:\n\u003e\n\u003e $x = \"\\\\\\\\N\\{U\\+\\.\\}\";\n\u003e $foo =~ $x\n\u003e\n\u003e?\n\nYes; I get the same symptoms for this code as for the original one\\.\n\n\\-\\- \nJakub Wilk","bodyHTML":"\u003ch3 dir=\"auto\"\u003eFrom \u003ca class=\"user-mention notranslate\" data-hovercard-type=\"user\" data-hovercard-url=\"/users/jwilk/hovercard\" data-octo-click=\"hovercard-link-click\" data-octo-dimensions=\"link_type:self\" href=\"https://github.com/jwilk\"\u003e@jwilk\u003c/a\u003e\u003c/h3\u003e\n\u003cp dir=\"auto\"\u003e* Tony Cook via RT \u0026lt;perl5-security-report@perl.org\u0026gt;, 2017-08-11, 02:30:\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eIf this only happens for single-quotish patterns, then this isn't a security\u003cbr\u003e\nissue, since single quotish patterns don't do interpolation.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eI wasn't able to reproduce it (but I only tested on x64).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eCan it happen in other cases, like:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e$x = \"\\\\N{U+.}\";\u003cbr\u003e\n$foo =~ $x\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e?\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eYes; I get the same symptoms for this code as for the original one.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e--\u003cbr\u003e\nJakub Wilk\u003c/p\u003e","bodyVersion":"c8c1d0c0b4b6d627efd637c3d9e8c0b9f7def2917315c0f5bdd3f4764fe022dd","viewerCanUpdate":false,"url":"https://github.com/Perl/perl5/issues/16025#issuecomment-544089720","createdAt":"2017-08-11T12:45:54Z","authorAssociation":"NONE","viewerCanDelete":false,"viewerCanMinimize":false,"viewerCanReport":false,"viewerCanReportToMaintainer":false,"viewerCanBlockFromOrg":false,"viewerCanUnblockFromOrg":false,"isHidden":false,"minimizedReason":null,"showSpammyBadge":false,"createdViaEmail":false,"authorToRepoOwnerSponsorship":null,"repository":{"id":"MDEwOlJlcG9zaXRvcnk4MTgzNTcw","name":"perl5","owner":{"__typename":"Organization","id":"MDEyOk9yZ2FuaXphdGlvbjM1ODU0MTE=","login":"Perl","url":"https://github.com/Perl"},"isPrivate":false,"slashCommandsEnabled":false,"nameWithOwner":"Perl/perl5","databaseId":8183570},"__isComment":"IssueComment","viewerCanReadUserContentEdits":true,"lastEditedAt":null,"lastUserContentEdit":null,"__isReactable":"IssueComment","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"__isNode":"IssueComment"},"cursor":"Y3Vyc29yOnYyOpPPAAABXdFUX9AAqTU0NDA4OTcyMA=="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":544089722,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"p5pRT","id":"MDQ6VXNlcjUxNzk4MDE4"},"id":"MDU6SXNzdWU1MDkzOTE2NTE=","number":16025,"locked":false,"databaseId":509391651},"author":{"__typename":"User","login":"p5pRT","avatarUrl":"https://avatars.githubusercontent.com/u/51798018?u=c0c9dec90db4d6102e88553f891e56b4bb45370e\u0026v=4","id":"MDQ6VXNlcjUxNzk4MDE4"},"id":"MDEyOklzc3VlQ29tbWVudDU0NDA4OTcyMg==","body":"### From @tonycoz\n\nOn Fri\\, 11 Aug 2017 05\u0026#8203;:45\u0026#8203;:54 \\-0700\\, jwilk@\u0026#8203;jwilk\\.net wrote\u0026#8203;:\n\u003e \\* Tony Cook via RT \\\u003cperl5\\-security\\-report@\u0026#8203;perl\\.org\u003e\\, 2017\\-08\\-11\\,\n\u003e 02\u0026#8203;:30\u0026#8203;:\n\u003e \u003e If this only happens for single\\-quotish patterns\\, then this isn't a\n\u003e \u003e security\n\u003e \u003e issue\\, since single quotish patterns don't do interpolation\\.\n\u003e \u003e\n\u003e \u003e I wasn't able to reproduce it \\(but I only tested on x64\\)\\.\n\u003e \u003e\n\u003e \u003e Can it happen in other cases\\, like\u0026#8203;:\n\u003e \u003e\n\u003e \u003e $x = \"\\\\\\\\N\\{U\\+\\.\\}\";\n\u003e \u003e $foo =~ $x\n\u003e \u003e\n\u003e \u003e ?\n\u003e \n\u003e Yes; I get the same symptoms for this code as for the original one\\.\n\nThanks\\, so it's a security issue\\.\n\nI think it should be treated as a separate CVE from \\#131582\\, since they're different bugs and different consequences\\.\n\nTony","bodyHTML":"\u003ch3 dir=\"auto\"\u003eFrom \u003ca class=\"user-mention notranslate\" data-hovercard-type=\"user\" data-hovercard-url=\"/users/tonycoz/hovercard\" data-octo-click=\"hovercard-link-click\" data-octo-dimensions=\"link_type:self\" href=\"https://github.com/tonycoz\"\u003e@tonycoz\u003c/a\u003e\u003c/h3\u003e\n\u003cp dir=\"auto\"\u003eOn Fri, 11 Aug 2017 05:45:54 -0700, jwilk@jwilk.net wrote:\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003e* Tony Cook via RT \u0026lt;perl5-security-report@perl.org\u0026gt;, 2017-08-11,\u003cbr\u003e\n02:30:\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eIf this only happens for single-quotish patterns, then this isn't a\u003cbr\u003e\nsecurity\u003cbr\u003e\nissue, since single quotish patterns don't do interpolation.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eI wasn't able to reproduce it (but I only tested on x64).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eCan it happen in other cases, like:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e$x = \"\\\\N{U+.}\";\u003cbr\u003e\n$foo =~ $x\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e?\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eYes; I get the same symptoms for this code as for the original one.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eThanks, so it's a security issue.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eI think it should be treated as a separate CVE from #131582, since they're different bugs and different consequences.\u003c/p\u003e\n\u003cp 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class="Avatar-module__avatarLink--S36bm Avatar-module__avatarOuter--MZJZH prc-Link-Link-85e08" href="/p5pRT" data-hovercard-url="/users/p5pRT/hovercard" aria-label="@p5pRT's profile"><img data-component="Avatar" class="Avatar-module__issueViewerAvatar--grA_h prc-Avatar-Avatar-ZRS-m" alt="@p5pRT" width="40" height="40" style="--avatarSize-regular:40px" src="https://avatars.githubusercontent.com/u/51798018?u=c0c9dec90db4d6102e88553f891e56b4bb45370e&v=4&size=80" data-testid="github-avatar"/></a><div data-testid="issue-body" class="Box-sc-g0xbh4-0 bDlPR react-issue-body" data-hpc="true"><h2 class="sr-only">Description</h2><div class="Box-sc-g0xbh4-0 crMLA-D"><div class="Box-sc-g0xbh4-0 bjwYme"><div class="Box-sc-g0xbh4-0 jSpDiO"><div class="Box-sc-g0xbh4-0 fnEhwD ActivityHeader-module__activityHeader--Flalv"><div class="Box-sc-g0xbh4-0 iKiGfw Avatar-module__avatarInner--rVuJD"><a class="Avatar-module__avatarLink--S36bm prc-Link-Link-85e08" href="/p5pRT" data-hovercard-url="/users/p5pRT/hovercard" aria-label="@p5pRT's profile"><img data-component="Avatar" class="prc-Avatar-Avatar-ZRS-m" alt="@p5pRT" width="24" height="24" style="--avatarSize-regular:24px" src="https://avatars.githubusercontent.com/u/51798018?u=c0c9dec90db4d6102e88553f891e56b4bb45370e&v=4&size=48" data-testid="github-avatar"/></a></div><div class="Box-sc-g0xbh4-0 koxHLL ActivityHeader-module__narrowViewportWrapper--Hjl75"><div class="Box-sc-g0xbh4-0 dqmClk"><a class="Box-sc-g0xbh4-0 cRhwji prc-Link-Link-85e08" href="https://github.com/p5pRT" data-hovercard-url="/users/p5pRT/hovercard" data-testid="issue-body-header-author">p5pRT</a></div><div class="Box-sc-g0xbh4-0 bJQcYY ActivityHeader-module__footer--FVHp7"><span>opened </span><a class="Box-sc-g0xbh4-0 bjFvWy prc-Link-Link-85e08" href="https://github.com/Perl/perl5/issues/16025#issue-509391651" data-testid="issue-body-header-link"><relative-time sx="[object Object]" class="sc-aXZVg gcWyXp">on <!-- -->Jun 18, 2017</relative-time></a></div></div><div class="Box-sc-g0xbh4-0 kgTqOk ActivityHeader-module__narrowViewportWrapper--Hjl75"><div class="Box-sc-g0xbh4-0 izrTon ActivityHeader-module__edits--LwHTE"></div><div class="Box-sc-g0xbh4-0 kpoUe"><div class="Box-sc-g0xbh4-0 ezcJRX"></div><div class="Box-sc-g0xbh4-0 dnyPuu"><button data-component="IconButton" type="button" aria-haspopup="true" aria-expanded="false" tabindex="0" class="prc-Button-ButtonBase-c50BI prc-Button-IconButton-szpyj" data-loading="false" data-no-visuals="true" data-size="small" data-variant="invisible" aria-describedby=":R15bd5db:-loading-announcement" aria-labelledby=":Rv5bd5db:" id=":R15bd5db:"><svg aria-hidden="true" focusable="false" class="octicon octicon-kebab-horizontal" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M8 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3ZM1.5 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Zm13 0a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Z"></path></svg></button><span class="prc-TooltipV2-Tooltip-cYMVY" data-direction="s" aria-hidden="true" id=":Rv5bd5db:">Issue body actions</span></div></div></div></div></div><div class="IssueBodyViewer-module__IssueBody--MXyFt"><div data-testid="markdown-body" data-team-hovercards-enabled="true" class="markdown-body" data-turbolinks="false"><div class="Box-sc-g0xbh4-0 markdown-body NewMarkdownViewer-module__safe-html-box--cRsz0"><p dir="auto">Migrated from <a href="https://rt-archive.perl.org/perl5/Ticket/Display.html?id=131598" rel="nofollow">rt.perl.org#131598</a> (status was 'resolved')</p> <p dir="auto">Searchable as RT131598$</p></div></div><div class="IssueBodyViewer-module__IssueBodyTaskList--r4XEH"><!--$--><div role="toolbar" aria-label="Reactions" class="d-flex gap-1 flex-wrap"></div><!--/$--></div></div></div></div></div></div></div><div data-testid="issue-viewer-comments-container" class="react-comments-container"><div class="Box-sc-g0xbh4-0 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