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] [day] [month] [year] [list]

Message-ID: <alpine.DEB.2.20.1608240917580.2070@macbook-air>
Date:   Wed, 24 Aug 2016 09:20:24 -0400 (EDT)
From:   Vince Weaver <vincent.weaver@...ne.edu>
To:     Ingo Molnar <mingo@...nel.org>
cc:     Vince Weaver <vincent.weaver@...ne.edu>,
        Peter Zijlstra <peterz@...radead.org>,
        Huang Rui <ray.huang@....com>, linux-kernel@...r.kernel.org,
        Borislav Petkov <bp@...e.de>, Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>
Subject: Re: perf: fuzzer crashes immediately on AMD system

On Wed, 24 Aug 2016, Ingo Molnar wrote:
> If there's no progress finding the root cause I'd be happy to exchange a crash for 
> a leak ...

It's actually a crash of the program doing the perf_event_open() call, not 
a crash of the system (at least in my experience).

However, it's possible that if you have bad luck and if the kfree'd space 
is reused with just the right combination of values you could potentially 
end up crashing the system.

Vince