Date: Thu, 5 Jun 2014 19:24:30 +0400 From: Solar Designer <solar@...nwall.com> To: Greg KH <greg@...ah.com>, Thomas Gleixner <tglx@...utronix.de> Cc: oss-security@...ts.openwall.com Subject: Re: Linux kernel futex local privilege escalation (CVE-2014-3153) Greg, Thomas - On Thu, Jun 05, 2014 at 06:45:45PM +0400, Solar Designer wrote: > This was handled via linux-distros, hence the mandatory oss-security > posting. The issue was made public earlier today, and is included in > this Debian advisory: > > https://lists.debian.org/debian-security-announce/2014/msg00130.html > > --- > CVE-2014-3153 > > Pinkie Pie discovered an issue in the futex subsystem that allows a > local user to gain ring 0 control via the futex syscall. An > unprivileged user could use this flaw to crash the kernel (resulting > in denial of service) or for privilege escalation. > --- > > I've attached patches by Thomas Gleixner (four e-mails, in mbox format), Can you comment on how the four patches: Subject: [patch 1/4] futex-prevent-requeue-pi-on-same-futex.patch Subject: [patch 2/4] futex: Validate atomic acquisition in Subject: [patch 3/4] futex: Always cleanup owner tid in unlock_pi Subject: [patch 4/4] futex: Make lookup_pi_state more robust relate to these two on LKML: Subject: [PATCH 3.14 001/228] futex: Add another early deadlock detection check Subject: [PATCH 3.14 002/228] futex: Prevent attaching to kernel threads http://lists.openwall.net/linux-kernel/2014/06/05/179 http://lists.openwall.net/linux-kernel/2014/06/05/176 3.10: http://lists.openwall.net/linux-kernel/2014/06/04/894 http://lists.openwall.net/linux-kernel/2014/06/04/893 3.4: http://lists.openwall.net/linux-kernel/2014/06/05/437 http://lists.openwall.net/linux-kernel/2014/06/05/436 It appears that "futex: Add another early deadlock detection check" is assumed to have been applied, and is being revised further by "futex: Make lookup_pi_state more robust", but "futex: Prevent attaching to kernel threads" is a patch on its own, not touched by the four patches. Correct? Should distros be applying "futex: Prevent attaching to kernel threads" as well (back-porting it as necessary)? Does it have security impact (it appears so)? Thanks, and sorry for my confusion. Alexander
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