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Message-ID: <4FBD265C.2020403@redhat.com>
Date: Wed, 23 May 2012 12:03:08 -0600
From: Kurt Seifried <kseifried@...hat.com>
To: oss-security@...ts.openwall.com
Subject: Re: CVE Request -- kernel: huge pages: memory leak
on mmap failure
-----BEGIN PGP SIGNED MESSAGE-----
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On 05/23/2012 04:35 AM, Petr Matousek wrote:
> Description of problem: When called for anonymous (non-shared)
> mappings, hugetlb_reserve_pages() does a resv_map_alloc(). It
> depends on code in hugetlbfs's vm_ops->close() to release that
> allocation.
>
> However, in the mmap() failure path, we do a plain unmap_region()
> without the remove_vma() which actually calls vm_ops->close().
>
> An unprivileged local user could use this flaw to crash the
> system.
>
> References: https://bugzilla.redhat.com/show_bug.cgi?id=824345
> http://www.spinics.net/lists/linux-mm/msg34763.html
>
> Proposed upstream fix: https://lkml.org/lkml/2012/5/21/385
>
> Thanks,
Please use CVE-2012-2390 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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