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

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Date:	Mon, 17 Mar 2014 15:51:28 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	sam@...nborg.org
Cc:	keescook@...omium.org, linux-kernel@...r.kernel.org,
	sparclinux@...r.kernel.org
Subject: Re: [PATCH] sparc: use %s for unaligned panic

From: Sam Ravnborg <sam@...nborg.org>
Date: Sat, 15 Mar 2014 09:07:09 +0100

> 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()

Furthermore, this is a silly change because there are only two call sites, they
are both in this file, and they clearly do not pass format strings embedded
in the string.
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