linux-kernel - Re: perf: fuzzer crashes immediately on AMD system

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 18 Aug 2016 10:46:31 -0400 (EDT)
From:	Vince Weaver <vincent.weaver@...ne.edu>
To:	linux-kernel@...r.kernel.org
cc:	Borislav Petkov <bp@...e.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>
Subject: Re: perf: fuzzer crashes immediately on AMD system

On Thu, 18 Aug 2016, Vince Weaver wrote:

> Tried the perf_fuzzer on my A10 fam15h/model13h system with 4.8-rc2 and it
> falls over more or less immediately.
> 
> This maps to variable_test_bit()
> 	called by ctx = find_get_context(pmu, task, event);
> 		in kernel/events/core.c:9467
> 
> It happens quickly enough I can probably track down the exact event that 
> causes this, if needed.

I have a one line reproducer:

	perf stat -a -e amd_nb/config=0x37,config1=0x20/ /bin/ls