Re: CVE request: kernel: missing capabilities in fs_mask

[Eugene Teo <eugene () redhat com>]

Eugene Teo wrote:
> "When POSIX capabilities were introduced during the 2.1 Linux cycle, the
> fs mask, which represents the capabilities which having fsuid==0 is
> supposed to grant, did not include CAP_MKNOD and CAP_LINUX_IMMUTABLE.
> However, before capabilities the privilege to call these did in fact
> depend upon fsuid==0.
>
> This patch introduces those capabilities into the fsmask, restoring the
> old behavior.
>
> See the thread starting at http://lkml.org/lkml/2009/3/11/157 for reference.
>
> Note that if this fix is deemed valid, then earlier kernel versions (2.4
> and 2.2) ought to be fixed too.
>
> Changelog:
>  [Mar 23] Actually delete old CAP_FS_SET definition...
>  [Mar 20] Updated against J. Bruce Fields's patch"
>
> References:
> https://bugzilla.redhat.com/show_bug.cgi?id=497047
> http://lwn.net/Articles/328572/?format=printable
> http://lwn.net/Articles/328594/?format=printable
> http://git.kernel.org/linus/0ad30b8fd5fe798aae80df6344b415d8309342cc

Here's the link to the kernel 2.4 patch:
http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.4.37.y.git;a=commitdiff;h=1c06d5237647db43cb2043a19cb393f4ed4d942f

Thanks, Eugene
-- 
Eugene Teo / Red Hat Security Response Team