linux-kernel - Re: [PATCH] sparc: use %s for unaligned panic

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Message-ID: <20140315080709.GA14405@ravnborg.org>
Date:	Sat, 15 Mar 2014 09:07:09 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Kees Cook <keescook@...omium.org>
Cc:	linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>, sparclinux@...r.kernel.org
Subject: Re: [PATCH] sparc: use %s for unaligned panic

On Tue, Mar 11, 2014 at 01:24:46PM -0700, Kees Cook wrote:
> Since unaligned_panic() takes a literal string, make sure it can never
> accidentally be used as a format string.
> 
> Signed-off-by: Kees Cook <keescook@...omium.org>
> ---
>  arch/sparc/kernel/unaligned_32.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/sparc/kernel/unaligned_32.c b/arch/sparc/kernel/unaligned_32.c
> index c0ec89786193..892e399414e0 100644
> --- a/arch/sparc/kernel/unaligned_32.c
> +++ b/arch/sparc/kernel/unaligned_32.c
> @@ -162,7 +162,7 @@ unsigned long safe_compute_effective_address(struct pt_regs *regs,
>  /* This is just to make gcc think panic does return... */
>  static void unaligned_panic(char *str)
>  {
> -	panic(str);
> +	panic("%s", str);
>  }
>  
>  /* una_asm.S */

Another "fix" would be to align with sparc64 and call die_if_kernel()

	Sam
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