linux-kernel - Re: [PATCH V6] ARM : unwinder : Prevent data abort due to stack overflow

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Date:	Tue, 10 Dec 2013 21:49:51 +0530
From:	Anurag Aggarwal <anurag19aggarwal@...il.com>
To:	Anurag Aggarwal <a.anurag@...sung.com>
Cc:	Dave Martin <Dave.Martin@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Naveen Kumar <naveen.sel@...sung.com>,
	Narendra Meher <narendra.m1@...sung.com>,
	"nico@...aro.org" <nico@...aro.org>,
	"catalin.marinas@....com" <catalin.marinas@....com>,
	"will.deacon@....com" <will.deacon@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ashish Kalra <ashish.kalra@...sung.com>,
	"cpgs ." <cpgs@...sung.com>,
	"naveenkrishna.ch@...il.com" <naveenkrishna.ch@...il.com>,
	Rajat Suri <rajat.suri@...sung.com>,
	Poorva Srivastava <poorva.s@...sung.com>,
	Mohammad Irfan Ansari <mohammad.a2@...sung.com>
Subject: Re: [PATCH V6] ARM : unwinder : Prevent data abort due to stack overflow

>>+               if (*vsp >= (unsigned long *)ctrl->sp_high)
>>+                       return -URC_FAILURE;

I tested the same patch, by adding a printk statement in the above if condition.
The print statement I added came a few times as a part of dmesg log.

I think this proves that such corner cases are being handled by the above code

Regards
Anurag

On Tue, Dec 10, 2013 at 9:24 AM, Anurag Aggarwal <a.anurag@...sung.com> wrote:
>>Reviewed-by: Dave Martin <Dave.Martin@....com>
>>
>>I can confirm that the kernel "doesn't crash" with this applied, and
>>that backtracing at least partially works.  But this is not really
>>sufficient to demontrate that the now code works better than the old
>>code in corner cases (which is the point of the patch).
>>
>>Can you give details of what additional testing you have, or plan to
>>do?
>
> We saw a data abort in unwinder for one of Samsung Project, during a
> Samsung Automation test case.
> After that I created the initial the patch, and the data abort has not been
> seen till now.
>
> Is it possible for you to give an idea on what other kind of additional testing
> do you have in mind.
>
> Regads
> Anurag
>



-- 
Anurag Aggarwal
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