linux-kernel - Re: [PATCH] perf, ui: Eliminate stack-smashing protection compiler complain

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Date:	Sun, 7 Nov 2010 22:49:02 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Cyrill Gorcunov <gorcunov@...il.com>
Cc:	Arnaldo Carvalho de Melo <acme@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] perf, ui: Eliminate stack-smashing protection compiler
	complain

On Sat, Nov 06, 2010 at 11:47:24AM +0300, Cyrill Gorcunov wrote:
>  The gcc complains on Yes, No being allocated from stack space. Make
> them conts to feel compiler happy.
> 
>  |    CC util/ui/util.o
>  | cc1: warnings being treated as errors
>  | util/ui/util.c: In function ‘ui__dialog_yesno’:
>  | util/ui/util.c:108: error: not protecting function: no buffer at least 8 bytes long
>  | make: *** [util/ui/util.o] Error 1
> 
> Signed-off-by: Cyrill Gorcunov <gorcunov@...nvz.org>
> CC: Arnaldo Carvalho de Melo <acme@...hat.com>
> CC: Frédéric Weisbecker <fweisbec@...il.com>
> CC: Ingo Molnar <mingo@...e.hu>
> ---



I hope we can finally queue this one fix, the warning is there
for a while now, and this patch looks quite sensible :)



> 
> Since it seems only me who has such error I presume ssp-buffer-size=8 set
> for mine local version of gcc (gcc version 4.3.3 (Ubuntu 4.3.3-5ubuntu4))
> 
>  tools/perf/util/ui/util.c |    5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> Index: linux-2.6.git/tools/perf/util/ui/util.c
> =====================================================================
> --- linux-2.6.git.orig/tools/perf/util/ui/util.c
> +++ linux-2.6.git/tools/perf/util/ui/util.c
> @@ -104,9 +104,10 @@ out_destroy_form:
>  	return rc;
>  }
>  
> +static const char yes[] = "Yes", no[] = "No";
>  bool ui__dialog_yesno(const char *msg)
>  {
>  	/* newtWinChoice should really be accepting const char pointers... */
> -	char yes[] = "Yes", no[] = "No";
> -	return newtWinChoice(NULL, yes, no, (char *)msg) == 1;
> +	return newtWinChoice(NULL, (char *)yes, (char *)no, (char *)msg) == 1;
>  }

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