Commit 609a3e81 authored by Daniel Micay's avatar Daniel Micay Committed by Greg Kroah-Hartman

stackprotector: Increase the per-task stack canary's random range from 32 bits...

stackprotector: Increase the per-task stack canary's random range from 32 bits to 64 bits on 64-bit platforms

commit 5ea30e4e 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: default avatarDaniel Micay <danielmicay@gmail.com>
Acked-by: default avatarArjan van de Ven <arjan@linux.intel.com>
Acked-by: default avatarRik van Riel <riel@redhat.com>
Acked-by: default avatarKees 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.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 1897f50c
...@@ -338,7 +338,7 @@ static struct task_struct *dup_task_struct(struct task_struct *orig) ...@@ -338,7 +338,7 @@ static struct task_struct *dup_task_struct(struct task_struct *orig)
set_task_stack_end_magic(tsk); set_task_stack_end_magic(tsk);
#ifdef CONFIG_CC_STACKPROTECTOR #ifdef CONFIG_CC_STACKPROTECTOR
tsk->stack_canary = get_random_int(); tsk->stack_canary = get_random_long();
#endif #endif
/* /*
......
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