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List: linux-api
Subject: Re: [PATCH v2 0/2] setgid hardening
From: Andy Lutomirski <luto () amacapital ! net>
Date: 2017-01-31 3:56:04
Message-ID: CALCETrUuR-ZkvEs0_5aN4yyyR34jYcJj7-_VjOv4nJWu6fvOjA () mail ! gmail ! com
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On Mon, Jan 30, 2017 at 7:49 PM, Michael Kerrisk <mtk.manpages@gmail.com> wrote:
> [CC += linux-api@]
>
> Andy, this is an API change!
Indeed. I should be ashamed of myself!
>
> On Sat, Jan 28, 2017 at 3:49 PM, Andy Lutomirski <luto@kernel.org> wrote:
>> The kernel has some dangerous behavior involving the creation and
>> modification of setgid executables. These issues aren't kernel
>> security bugs per se, but they have been used to turn various
>> filesystem permission oddities into reliably privilege escalation
>> exploits.
>>
>> See http://www.halfdog.net/Security/2015/SetgidDirectoryPrivilegeEscalation/
>> for a nice writeup.
>>
>> Let's fix them for real.
>>
>> Changes from v1:
>> - Fix uninitialized variable issue (Willy, Ben)
>> - Also check current creds in should_remove_suid() (Ben)
>>
>> Andy Lutomirski (2):
>> fs: Check f_cred as well as of current's creds in should_remove_suid()
>> fs: Harden against open(..., O_CREAT, 02777) in a setgid directory
>>
>> fs/inode.c | 61 ++++++++++++++++++++++++++++++++++++++++++++++--------
>> fs/internal.h | 2 +-
>> fs/ocfs2/file.c | 4 ++--
>> fs/open.c | 2 +-
>> include/linux/fs.h | 2 +-
>> 5 files changed, 57 insertions(+), 14 deletions(-)
>>
>> --
>> 2.9.3
>>
>> --
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>
>
>
> --
> Michael Kerrisk Linux man-pages maintainer;
> http://www.kernel.org/doc/man-pages/
> Author of "The Linux Programming Interface", http://blog.man7.org/
--
Andy Lutomirski
AMA Capital Management, LLC
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