[PATCH] use get_random_long for the per-task stack canary

Daniel Micay
2017-05-04T13:32:32Z

The stack canary is an unsigned long and should be fully initialized to
random data rather than only 32 bits of random data.

Cc: stable@vger.kernel.org
Signed-off-by: Daniel Micay <danielmicay@gmail.com>
---
kernel/fork.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/fork.c b/kernel/fork.c
index 56d85fd81411..ff84ff82f56a 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -537,7 +537,7 @@ static struct task_struct *dup_task_struct(struct task_struct *orig, int node)
set_task_stack_end_magic(tsk);

#ifdef CONFIG_CC_STACKPROTECTOR
- tsk->stack_canary = get_random_int();
+ tsk->stack_canary = get_random_long();
#endif

/*
--
2.12.2