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LKML: Bill Davidsen: Re: [RCF] [PATCH] unprivileged mount/umount

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This (lightly tested) patch against 2.6.12-rc* adds some<br />&gt; infrastructure and basic functionality for unprivileged mount/umount<br />&gt; system calls.<br />&gt; <br />&gt; Details:<br />&gt; <br />&gt; - new mnt_owner field in struct vfsmount<br />&gt; - if mnt_owner is NULL, it's a privileged mount<br />&gt; - global limit on unprivileged mounts in /proc/sys/fs/mount-max<br />&gt; - per user limit of mounts in rlimit<br />&gt; - allow umount for the owner (except force flag)<br />&gt; - allow unprivileged bind mount to files/directories writable by owner<br />&gt; - add nosuid,nodev flags to unprivileged mounts<br />&gt; <br />&gt; Next step would be to add some policy for new mounts. I'm thinking of<br />&gt; either something static: e.g. FS_SAFE flag for "safe" filesystems, or<br />&gt; a more configurable approach through sysfs or something.<br />&gt; <br />&gt; Comments?<br /><br />Are these public or private mounts? In other words, is the mount visible <br />only to the mounting process and children, or is it visible to (and can <br />effect) other processes. Clearly true private mounts open uses with <br />chroot jails and virtualization.<br /><br />-- <br /> -bill davidsen (davidsen&#64;tmr.com)<br />"The secret to procrastination is to put things off until the<br /> last possible moment - but no longer" -me<br />-<br />To unsubscribe from this list: send the line "unsubscribe linux-kernel" in<br />the body of a message to majordomo&#64;vger.kernel.org<br />More majordomo info at <a href="http://vger.kernel.org/majordomo-info.html">http://vger.kernel.org/majordomo-info.html</a><br />Please read the FAQ at <a href="http://www.tux.org/lkml/">http://www.tux.org/lkml/</a><br /><br /></pre></td><td width="32" rowspan="2" class="c" valign="top"><img src="/images/icornerr.gif" width="32" height="32" alt="\" /></td></tr><tr><td align="right" valign="bottom"> 聽 </td></tr><tr><td align="right" valign="bottom">聽</td><td class="c" valign="bottom" style="padding-bottom: 0px"><img src="/images/bcornerl.gif" width="32" height="32" alt="\" /></td><td class="c">聽</td><td class="c" valign="bottom" style="padding-bottom: 0px"><img src="/images/bcornerr.gif" width="32" height="32" alt="/" /></td></tr><tr><td align="right" valign="top" colspan="2"> 聽 </td><td class="lm">Last update: 2005-05-03 21:58 聽聽 [from the cache]<br />漏2003-2020 <a href="http://blog.jasper.es/"><span itemprop="editor">Jasper Spaans</span></a>|hosted at <a href="https://www.digitalocean.com/?refcode=9a8e99d24cf9">Digital Ocean</a> and my Meterkast|<a href="http://blog.jasper.es/categories.html#lkml-ref">Read the blog</a></td><td>聽</td></tr></table><script language="javascript" src="/js/styleswitcher.js" type="text/javascript"></script></body></html>

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