linux-kernel - [PATCH 4.9 140/164] stackprotector: Increase the per-task stack canarys random range from 32 bits to 64 bits on 64-bit platforms

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Message-Id: <20170523200913.113216861@linuxfoundation.org>
Date:   Tue, 23 May 2017 22:09:17 +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 4.9 140/164] stackprotector: Increase the per-task stack canarys random range from 32 bits to 64 bits on 64-bit platforms

4.9-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
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
@@ -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
 
 	/*