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linux-kernel: Re: [PATCH 2.4] CAP_FS_MASK: add CAP_LINUX_IMMUTAB

Re: [PATCH 2.4] CAP_FS_MASK: add CAP_LINUX_IMMUTABLE and CAP_MKNOD

From: Willy Tarreau <w_at_nospam>
Date: Thu Mar 26 2009 - 05:29:58 GMT
To: "Serge E. Hallyn" <serue@us.ibm.com>


Hello,

On Wed, Mar 25, 2009 at 12:39:54PM -0500, Serge E. Hallyn 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.

Thanks to Igor and you for fixing this. The impact did not appear obvious to me at first, to be honnest! I'm queuing the patch for next release.

BTW, I've noticed your other patch for 2.2.26, but it's not worth wasting time on it, as 2.2 has remained unmaintained for years now and people are really discouraged from using it as many holes have never been fixed there.

Cheers,
Willy -- To unsubscribe from this list: send the line "unsubscribe linux-security-module" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html