[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>

1 files changed, 1 insertions, 1 deletions

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,