linux-kernel - [PATCH 3.2 75/94] sh: fix format string bug in stack tracer

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Message-ID: <lsq.1398647482.995597937@decadent.org.uk>
Date:	Mon, 28 Apr 2014 02:11:22 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Kees Cook" <keescook@...omium.org>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Paul Mundt" <lethal@...ux-sh.org>,
	"Matt Fleming" <matt.fleming@...el.com>
Subject: [PATCH 3.2 75/94] sh: fix format string bug in stack tracer

3.2.58-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Matt Fleming <matt.fleming@...el.com>

commit a0c32761e73c9999cbf592b702f284221fea8040 upstream.

Kees reported the following error:

   arch/sh/kernel/dumpstack.c: In function 'print_trace_address':
   arch/sh/kernel/dumpstack.c:118:2: error: format not a string literal and no format arguments [-Werror=format-security]

Use the "%s" format so that it's impossible to interpret 'data' as a
format string.

Signed-off-by: Matt Fleming <matt.fleming@...el.com>
Reported-by: Kees Cook <keescook@...omium.org>
Acked-by: Kees Cook <keescook@...omium.org>
Cc: Paul Mundt <lethal@...ux-sh.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/sh/kernel/dumpstack.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/sh/kernel/dumpstack.c
+++ b/arch/sh/kernel/dumpstack.c
@@ -80,7 +80,7 @@ static int print_trace_stack(void *data,
  */
 static void print_trace_address(void *data, unsigned long addr, int reliable)
 {
-	printk(data);
+	printk("%s", (char *)data);
 	printk_address(addr, reliable);
 }
 

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