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Message-Id: <20170612152559.204034809@linuxfoundation.org>
Date: Mon, 12 Jun 2017 17:25:53 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org,
Daniel Micay <danielmicay@...il.com>,
Arjan van de Ven <arjan@...ux.intel.com>,
Rik van Riel <riel@...hat.com>,
Kees Cook <keescook@...omium.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Peter Zijlstra <peterz@...radead.org>,
Thomas Gleixner <tglx@...utronix.de>,
kernel-hardening@...ts.openwall.com,
Ingo Molnar <mingo@...nel.org>
Subject: [PATCH 4.4 47/90] stackprotector: Increase the per-task stack canarys random range from 32 bits to 64 bits on 64-bit platforms
4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Daniel Micay <danielmicay@...il.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@...il.com>
Acked-by: Arjan van de Ven <arjan@...ux.intel.com>
Acked-by: Rik van Riel <riel@...hat.com>
Acked-by: Kees Cook <keescook@...omium.org>
Cc: Arjan van Ven <arjan@...ux.intel.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: kernel-hardening@...ts.openwall.com
Cc: stable@...r.kernel.org
Link: http://lkml.kernel.org/r/20170504133209.3053-1-danielmicay@gmail.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
kernel/fork.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -368,7 +368,7 @@ 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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