From: Andrea Righi <righiandr@users.sourceforge.net>
Date: Wed, 23 May 2007 21:14:52 +0000 (-0700)
Subject: [AVR32] ratelimit segfault reporting rate
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=126187f1e00048abec4d4a2eb3eeae396fbaa944;p=openwrt%2Fstaging%2Fblogic.git

[AVR32] ratelimit segfault reporting rate

Limit the rate of the kernel logging for the segfaults of user
applications, to avoid potential message floods or denial-of-service
attacks.

Signed-off-by: Andrea Righi <a.righi@cineca.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
---

diff --git a/arch/avr32/mm/fault.c b/arch/avr32/mm/fault.c
index e011f1ce1875..4b2495285d94 100644
--- a/arch/avr32/mm/fault.c
+++ b/arch/avr32/mm/fault.c
@@ -158,7 +158,7 @@ bad_area:
 	up_read(&mm->mmap_sem);
 
 	if (user_mode(regs)) {
-		if (exception_trace)
+		if (exception_trace && printk_ratelimit())
 			printk("%s%s[%d]: segfault at %08lx pc %08lx "
 			       "sp %08lx ecr %lu\n",
 			       is_init(tsk) ? KERN_EMERG : KERN_INFO,