From 5d920bb929a99446062a48cf90867bbca57b8e77 Mon Sep 17 00:00:00 2001 From: Filippo Arcidiacono Date: Thu, 19 Apr 2012 15:45:57 +0900 Subject: sh: initial stack protector support. This implements basic -fstack-protector support, based on the early ARM version in c743f38013aeff58ef6252601e397b5ba281c633. The SMP case is limited to the initial canary value, while the UP case handles per-task granularity (limited to 32-bit sh until a new enough sh64 compiler manifests itself). Signed-off-by: Filippo Arcidiacono Reviewed-by: Carmelo Amoroso Signed-off-by: Stuart Menefy Signed-off-by: Paul Mundt --- arch/sh/include/asm/stackprotector.h | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) create mode 100644 arch/sh/include/asm/stackprotector.h (limited to 'arch/sh/include/asm/stackprotector.h') diff --git a/arch/sh/include/asm/stackprotector.h b/arch/sh/include/asm/stackprotector.h new file mode 100644 index 000000000000..d9df3a76847c --- /dev/null +++ b/arch/sh/include/asm/stackprotector.h @@ -0,0 +1,27 @@ +#ifndef __ASM_SH_STACKPROTECTOR_H +#define __ASM_SH_STACKPROTECTOR_H + +#include +#include + +extern unsigned long __stack_chk_guard; + +/* + * Initialize the stackprotector canary value. + * + * NOTE: this must only be called from functions that never return, + * and it must always be inlined. + */ +static __always_inline void boot_init_stack_canary(void) +{ + unsigned long canary; + + /* Try to get a semi random initial value. */ + get_random_bytes(&canary, sizeof(canary)); + canary ^= LINUX_VERSION_CODE; + + current->stack_canary = canary; + __stack_chk_guard = current->stack_canary; +} + +#endif /* __ASM_SH_STACKPROTECTOR_H */ -- cgit v1.2.3