linux-kernel - Re: [RFC PATCH] tracing: Add BUG_ON when stack end location is over written

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Message-ID: <20140324103952.51f4a5c7@gandalf.local.home>
Date:	Mon, 24 Mar 2014 10:39:52 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Aaron Tomlin <atomlin@...hat.com>
Cc:	mingo@...hat.com, dzickus@...hat.com, jgh@...hat.com,
	mguzik@...hat.com, pzijlstr@...hat.com, peterz@...radead.org,
	hpa@...ux.intel.com, riel@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] tracing: Add BUG_ON when stack end location is over
 written

On Mon, 24 Mar 2014 14:03:57 +0000
Aaron Tomlin <atomlin@...hat.com> wrote:

> It is difficult to detect a stack overrun when it
> actually occurs.
> 
> We have observed that this type of corruption is often
> silent and can go unnoticed. Once the corrupted region
> is examined, the outcome is undefined and often
> results in sporadic system crashes.
> 
> When the stack tracing feature is enabled, let's check
> for this condition and take appropriate action.
> 
> Note: init_task doesn't get its stack end location
> set to STACK_END_MAGIC.
> 
> Signed-off-by: Aaron Tomlin <atomlin@...hat.com>
> ---

I added this to my 3.15 queue, and if it survives testing, I'll push it
to my for-next branch.

Thanks,

-- Steve
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