linux-kernel - Re: [patch] add /proc/pid/stack to dump task's stack trace

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Message-Id: <20081107011659.98d3788a.akpm@linux-foundation.org>
Date:	Fri, 7 Nov 2008 01:16:59 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Alexey Dobriyan <adobriyan@...il.com>,
	Ken Chen <kenchen@...gle.com>, linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [patch] add /proc/pid/stack to dump task's stack trace

On Fri, 7 Nov 2008 10:03:04 +0100 Ingo Molnar <mingo@...e.hu> wrote:

> task running on this CPU:
> 
>  # cat /proc/self/stack
>  [<ffffffff80216f79>] save_stack_trace_tsk+0x26/0x44
>  [<ffffffff802f59a5>] proc_pid_stack+0x6e/0xd3
>  [<ffffffff802f6da3>] proc_info_read+0x68/0xba
>  [<ffffffff802b2f17>] vfs_read+0xa9/0xe3
>  [<ffffffff802b301f>] sys_read+0x4c/0x73
>  [<ffffffff8020c23b>] system_call_fastpath+0x16/0x1b
>  [<ffffffffffffffff>] 0xffffffffffffffff

So we provide a means by which process A can sample process B's
instruction pointer?  Even if it's in random.c or crypto code?  There's
a little project for someone.

I guess the 0400 mode on that file will suffice...

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