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

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Date:	Tue, 06 May 2008 16:32:11 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Kevin Winchester <kjwinchester@...il.com>
CC:	David Miller <davem@...emloft.net>, linux-kernel@...r.kernel.org,
	mingo@...e.hu
Subject: Re: linux-next: WARNING: at kernel/panic.c:375 __stack_chk_test+0x50/0x54()

Kevin Winchester wrote:
> David Miller wrote:
>> From: Arjan van de Ven <arjan@...ux.intel.com>
>> Date: Tue, 06 May 2008 12:49:33 -0700
>>
>>> this is weird; something is adding ANOTHER -fstack-protector to the 
>>> (effective) gcc
>>> flags.. which might be overriding the -fstack-protector-all setting.
>>>
>>> I wonder if this is a distro special ;(
>>
>> Ubuntu adds -fstack-protector to the GCC command line.
>>
>> But I've been able to override it trivially when, for example, doing
>> GCC builds, by simply adding -fno-stack-protector.
> 
> I assume adding -fno-stack-protector would not really be an option in 
> this case (since if I understand correctly it would be appended to the 
> end of the flags which would turn the option off).
> 
> I guess I'll be figuring out how to build my own gcc...

one question (since I don't have an ubuntu system on my desk right now)

if you do

make V=1 kernel/panic.o

(after deleting that file if needed), can you check that -fstack-protector-all is the last
stack protector option we explicitly give to gcc ?
(anything else is distro special which we unfortunately cannot fix.. but maybe we can detect)

> 

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