Revert "stackprotector: Increase the per-task stack canary's random range from...

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

This reverts commit 609a3e81 which is
commit 5ea30e4e upstream.

It shouldn't have been backported to 3.18, as we do not have
get_random_long() in that kernel tree.
Reported-by: Philip Müller <philm@manjaro.org>
Cc: Daniel Micay <danielmicay@gmail.com>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: 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
Cc: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

kernel/fork.c

@@ -338,7 +338,7 @@ static struct task_struct *dup_task_struct(struct task_struct *orig)
 	set_task_stack_end_magic(tsk);
 
 #ifdef CONFIG_CC_STACKPROTECTOR
-	tsk->stack_canary = get_random_long();
+	tsk->stack_canary = get_random_int();
 #endif
 
 	/*