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Date: Thu, 20 Aug 2015 12:23:51 -0400 (EDT)
From: cve-assign@...re.org
To: wmealing@...hat.com
Cc: cve-assign@...re.org, oss-security@...ts.openwall.com
Subject: Re: CVE request - Linux kernel - perf on ppp64 - unbounded checks in perf_callchain_user_64 denial of service.

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> A malicious user could create a special stack layout that fools
> the perf_callchain_user_64 function (called by perf record) into
> an infinite loop, tying up that particular CPU and the process
> can not be killed.
> 
> A kernel patch was committed upstream capping the maximum user-level
> stacktrace collected by perf to PERF_MAX_STACK_DEPTH on 64bit powerpc
> architectures.
> 
> https://bugzilla.redhat.com/show_bug.cgi?id=1218454
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=9a5cbce421a283e6aea3c4007f141735bf9da8c3

>> We cap 32bit userspace backtraces to PERF_MAX_STACK_DEPTH (currently
>> 127), but we forgot to do the same for 64bit backtraces.

Use CVE-2015-6526.

- -- 
CVE assignment team, MITRE CVE Numbering Authority
M/S M300
202 Burlington Road, Bedford, MA 01730 USA
[ PGP key available through http://cve.mitre.org/cve/request_id.html ]
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