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

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Message-ID: <8760nmxs6b.fsf@concordia.ellerman.id.au>
Date:   Thu, 17 Nov 2016 22:27:24 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Denis Kirjanov <kda@...ux-powerpc.org>,
        Christophe Leroy <christophe.leroy@....fr>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Scott Wood <oss@...error.net>,
        Nicolas Pitre <nicolas.pitre@...aro.org>,
        "linuxppc-dev\@lists.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/2] powerpc: stack protector (-fstack-protector) support

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

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