linux-kernel - Re: linux-next: WARNING: at kernel/panic.c:375 __stack_chk

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Date:	Wed, 30 Apr 2008 21:24:27 -0300
From:	Kevin Winchester <kjwinchester@...il.com>
To:	Arjan van de Ven <arjan@...ux.intel.com>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: linux-next: WARNING: at kernel/panic.c:375 __stack_chk_test+0x50/0x54()

Arjan van de Ven wrote:
> Kevin Winchester wrote:
>> Hi Arjan,
>>
>> There doesn't seem to be an entry in MAINTAINERS for stack protector, 
>> but your signoff was on the last stack protector related commit I could 
>> find, so it's probably a good bet.
>>
>> I get the following in my dmesg after testing linux-next with the stack 
>> protector turned on.  This is an x86-64 UP box if that helps.  It 
>> appears to be related to the test for the feature (or perhaps that is 
>> supposed to happen when the feature is tested, I'm not sure...).  Config 
>> below.
>>
> 
> the important question is: exactly what gcc are you using? (and if you use a distro gcc,
> which distro)
> 
> second question would be, what does the following command give?
> 
> echo "int foo(void) { char X[200]; return 3; }" | $1 -S -xc -c -O0 -mcmodel=kernel -fstack-protector - -o -
> 
> (this is the command from scripts/gcc-x86_64-has-stack-protector.sh that the kernel uses to test at compiletime
>   if you have stack protector support)

Ubuntu Hardy Heron

kevin@...khine:~$ gcc --version
gcc (GCC) 4.2.3 (Ubuntu 4.2.3-2ubuntu7)
Copyright (C) 2007 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.


kevin@...khine:~$ echo "int foo(void) { char X[200]; return 3; }" | $1 -S -xc -c -O0 -mcmodel=kernel -fstack-protector - -o -
bash: -S: command not found

I assume that $1 was supposed to be gcc, so how about:

kevin@...khine:~/linux/linux-2.6/scripts$ sh gcc-x86_64-has-stack-protector.sh gcc something
something

So I would assume that means I pass...

Does that help at all?

-- 
Kevin Winchester




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