linux-kernel - Re: [PATCH 0/2] powerpc: stack protector (-fstack-protector) support

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Message-ID: <CAOJe8K0DsnoQiiT0CFxhJ8_LV784kMuH7cM88OSAgGXm7_Pysw@mail.gmail.com>
Date:   Fri, 18 Nov 2016 15:43:48 +0300
From:   Denis Kirjanov <kda@...ux-powerpc.org>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     Christophe Leroy <christophe.leroy@....fr>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Scott Wood <oss@...error.net>,
        Nicolas Pitre <nicolas.pitre@...aro.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/2] powerpc: stack protector (-fstack-protector) support

On 11/17/16, Michael Ellerman <mpe@...erman.id.au> wrote:
> Denis Kirjanov <kda@...ux-powerpc.org> writes:
>
>> On Friday, September 30, 2016, Christophe Leroy <christophe.leroy@....fr>
>> wrote:
>>
>>> Add HAVE_CC_STACKPROTECTOR to powerpc. This is copied from ARM.
>>>
>>> Not tested on PPC64, compile ok with ppc64_
>>
>>
>> Hi Christophe,
>>
>> are you going to test it on ppc64? If not, I can take it

Not yet, I've broken my test machine :/ I need some time to recover

>
> Did you get around to testing it?
>
> It seems to be working here:
>
>   root@...-ubuntu-le:/sys/kernel/debug/provoke-crash# echo CORRUPT_STACK >
> DIRECT
>   Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in:
> c000000000671ed8
>
>   CPU: 1 PID: 3835 Comm: bash Not tainted
> 4.9.0-rc5-compiler_gcc-6.2.0-00075-gf41db6c7a3c8-dirty #464
>   Call Trace:
>   [c0000000dbf73a30] [c000000000541728] dump_stack+0xb8/0x100 (unreliable)
>
>   [c0000000dbf73a70] [c000000000219ba8] panic+0x14c/0x320
>   [c0000000dbf73b10] [c0000000000c27ec] __stack_chk_fail+0x2c/0x30
>   [c0000000dbf73b70] [c000000000671ed8] lkdtm_CORRUPT_STACK+0x88/0x90
>   [c0000000dbf73bf0] [6161616161616161] 0x6161616161616161
>   Rebooting in 10 seconds..
>
>
> cheers
>