* [kernel-hardening] [PATCH 4.9 140/164] stackprotector: Increase the per-task stack canarys random range from 32 bits to 64 bits on 64-bit platforms
[not found] <20170523200907.297534241@linuxfoundation.org>
@ 2017-05-23 20:09 ` Greg Kroah-Hartman
0 siblings, 0 replies; only message in thread
From: Greg Kroah-Hartman @ 2017-05-23 20:09 UTC (permalink / raw)
To: linux-kernel
Cc: Greg Kroah-Hartman, stable, Daniel Micay, Arjan van de Ven,
Rik van Riel, Kees Cook, Linus Torvalds, Peter Zijlstra,
Thomas Gleixner, kernel-hardening, Ingo Molnar
4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Daniel Micay <danielmicay@gmail.com>
commit 5ea30e4e58040cfd6434c2f33dc3ea76e2c15b05 upstream.
The stack canary is an 'unsigned long' and should be fully initialized to
random data rather than only 32 bits of random data.
Signed-off-by: Daniel Micay <danielmicay@gmail.com>
Acked-by: Arjan van de Ven <arjan@linux.intel.com>
Acked-by: Rik van Riel <riel@redhat.com>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: Arjan van Ven <arjan@linux.intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: kernel-hardening@lists.openwall.com
Link: http://lkml.kernel.org/r/20170504133209.3053-1-danielmicay@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
kernel/fork.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -521,7 +521,7 @@ static struct task_struct *dup_task_stru
set_task_stack_end_magic(tsk);
#ifdef CONFIG_CC_STACKPROTECTOR
- tsk->stack_canary = get_random_int();
+ tsk->stack_canary = get_random_long();
#endif
/*
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2017-05-23 20:09 ` [kernel-hardening] [PATCH 4.9 140/164] stackprotector: Increase the per-task stack canarys random range from 32 bits to 64 bits on 64-bit platforms Greg Kroah-Hartman
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