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Message-ID: <51241C69.1090501@redhat.com>
Date: Tue, 19 Feb 2013 17:44:25 -0700
From: Kurt Seifried <kseifried@...hat.com>
To: oss-security@...ts.openwall.com, Kurt Seifried <kseifrie@...hat.com>
Subject: Re: CVE request -- Linux kernel: mm: thp: pmd_present
and PROT_NONE local DoS
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
On 02/19/2013 05:40 PM, Petr Matousek wrote:
> Most VM places are using pmd_none but a few are still using pmd_present.
> The meaning is about the same for the pmd. However pmd_present would
> return the wrong value on PROT_NONE ranges. When the code using
> pmd_present gets a false negative, the kernel will crash.
>
> An unprivileged local user could use this flaw to crash the system.
>
> Upstream fix:
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commit;h=027ef6c8
>
> References:
> https://bugzilla.redhat.com/show_bug.cgi?id=912898
>
> Thanks,
>
Please use CVE-2013-0309 for this issue.
- --
Kurt Seifried Red Hat Security Response Team (SRT)
PGP: 0x5E267993 A90B F995 7350 148F 66BF 7554 160D 4553 5E26 7993
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