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Date: Mon, 16 Apr 2007 13:03:08 +0200 From: Miklos Szeredi <miklos@...redi.hu> To: akpm@...ux-foundation.org, serue@...ibm.com, viro@....linux.org.uk, linuxram@...ibm.com, ebiederm@...ssion.com Cc: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, containers@...ts.osdl.org Subject: [patch 00/10] mount ownership and unprivileged mount syscall (v3) This patchset adds support for keeping mount ownership information in the kernel, and allow unprivileged mount(2) and umount(2) in certain cases. This can be useful for the following reasons: - mount(8) can store ownership ("user=XY" option) in the kernel instead, or in addition to storing it in /etc/mtab. For example if private namespaces are used with mount propagations /etc/mtab becomes unworkable, but using /proc/mounts works fine - fuse won't need a special suid-root mount/umount utility. Plain umount(8) can easily be made to work with unprivileged fuse mounts - users can use bind mounts without having to pre-configure them in /etc/fstab The following security measures are taken for unprivileged mounts: - only allow submounting under mounts which have a special mount flag set - only allow mounting on files/directories writable by the user - limit the number of user mounts - force "nosuid,nodev" mount options Changes from the previous submissions: - add mount flags to set/clear mnt_flags individually - add "usermnt" mount flag. If it is set, then allow unprivileged submounts under this mount - make max number of user mounts default to 1024, since now the usermnt flag will prevent user mounts by default -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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