linux-kernel - Re: [PATCH] sched/clock: prevent tracing recursion in sched_clock

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: <20140306105131.GK9987@twins.programming.kicks-ass.net>
Date:	Thu, 6 Mar 2014 11:51:31 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Fernando Luis Vázquez Cao 
	<fernando_b1@....ntt.co.jp>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	StevenRostedt <rostedt@...dmis.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sched/clock: prevent tracing recursion in
 sched_clock_cpu()

On Thu, Mar 06, 2014 at 02:25:28PM +0900, Fernando Luis Vázquez Cao wrote:
> From: Fernando Luis Vazquez Cao <fernando@....ntt.co.jp>
> 
> Prevent tracing of preempt_disable/enable() in sched_clock_cpu().
> When CONFIG_DEBUG_PREEMPT is enabled, preempt_disable/enable() are
> traced and this causes trace_clock() users (and probably others) to
> go into an infinite recursion. Systems with a stable sched_clock()
> are not affected.
> 
> This problem is similar to that fixed by upstream commit 95ef1e52922
> ("KVM guest: prevent tracing recursion with kvmclock").
> 
> Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Signed-off-by: Fernando Luis Vazquez Cao <fernando@....ntt.co.jp>

Thanks!
--
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/