Messages in this thread Patch in this message | | | From | riel@redhat ... | Subject | [PATCH 2/5] fork,random: use get_random_canary to set tsk->stack_canary | Date | Wed, 24 May 2017 11:57:48 -0400 |
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From: Rik van Riel <riel@redhat.com>
Use the ascii-armor canary to prevent unterminated C string overflows from being able to successfully overwrite the canary, even if they somehow obtain the canary value.
Inspired by execshield ascii-armor and Daniel Micay's linux-hardened tree.
Signed-off-by: Rik van Riel <riel@redhat.com> --- kernel/fork.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/fork.c b/kernel/fork.c index aa1076c5e4a9..b3591e9250a8 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -560,7 +560,7 @@ 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_long(); + tsk->stack_canary = get_random_canary(); #endif /* -- 2.9.3
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