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]
Message-ID: <c62985530811152232q2794ce1o6732c241821c6eca@mail.gmail.com>
Date:	Sun, 16 Nov 2008 07:32:46 +0100
From:	"Frédéric Weisbecker" <fweisbec@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	"Steven Rostedt" <rostedt@...dmis.org>,
	"Linux Kernel" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/4] tracing/branch-tracer: Fix a trace recursion on branch tracer

2008/11/16 Ingo Molnar <mingo@...e.hu>:
>
> * Frederic Weisbecker <fweisbec@...il.com> wrote:
>
>> Impact: Make the branch tracer use raw irq save/restore
>>
>> When the branch tracer inserts an event through
>> probe_likely_condition(), it calls local_irq_save() and then results
>> in a trace recursion.
>>
>> local_irq_save() -> trace_hardirqs_off() -> trace_hardirqs_off_caller()
>>       -> unlikely()
>>
>> The trace_branch.c file is protected by DISABLE_BRANCH_PROFILING but
>> that doesn't prevent from external call to functions that use
>> unlikely().
>>
>> My box crashed each time I tried to set this tracer (sudden and hard
>> reboot).
>
> So this patch fixes that problem, or are there other problems left?
>
>        Ingo
>


I forgot to answer to all. Yes that fixes it.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ