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Date: Thu, 4 May 2017 09:32:09 -0400
From: Daniel Micay <danielmicay@...il.com>
To: Kees Cook <keescook@...omium.org>,
Arjan van Ven <arjan@...ux.intel.com>,
Ingo Molnar <mingo@...e.hu>,
kernel-hardening@...ts.openwall.com,
LKML <linux-kernel@...r.kernel.org>
Cc: Daniel Micay <danielmicay@...il.com>,
stable@...r.kernel.org
Subject: [PATCH] use get_random_long for the per-task stack canary
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@...r.kernel.org
Signed-off-by: Daniel Micay <danielmicay@...il.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
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