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:	Mon, 23 May 2016 18:28:07 -0700
From:	Andrei Vagin <avagin@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>,
	Andy Lutomirski <luto@...nel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>
Subject: Re: x86: A process doesn't stop on hw breakpoints sometimes

On Mon, May 23, 2016 at 4:05 PM, Andrei Vagin <avagin@...il.com> wrote:
> Hi,
>
> We use breakpoints on CRIU to stop a processes before calling
> rt_sigreturn and we found that sometimes a process runs through a
> break-point without stopping on it.
>
> https://github.com/xemul/criu/issues/162
>
>
> A small reproducer is attached. It forks a child, stops it, sets a
> breakpoint, executes a child, waits when it stops on the breakpoint. I
> execute it a few times concurrently and wait a few minutes.
>
> https://asciinema.org/a/006l3u5v82ubbkfy9fto07agd

I reproduced this issue on 4.4.9-300.fc23.x86_64

>
> I know that it can be reproduced on:
> AMD A10 Micro-6700T
> Intel(R) Core(TM) i5-5200U CPU @ 2.20GHz
> Intel(R) Core(TM) i7-4600U CPU @ 2.10GHz
>
> so It doesn't look like a bug in a processor.
>
> Thanks,
> Andrew

Powered by blists - more mailing lists