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| author | Dave Airlie <airlied@redhat.com> | 2020-03-11 07:27:21 +1000 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2020-03-11 07:27:21 +1000 |
| commit | d3bd37f587b4438d47751d0f1d5aaae3d39bd416 (patch) | |
| tree | 9414a8fd1ca74c47fe1a3966e0a22469ac0b73a3 /arch/csky/include/asm/stackprotector.h | |
| parent | Merge tag 'drm-misc-next-2020-02-27' of git://anongit.freedesktop.org/drm/drm... (diff) | |
| parent | Linux 5.6-rc5 (diff) | |
| download | linux-d3bd37f587b4438d47751d0f1d5aaae3d39bd416.tar.gz linux-d3bd37f587b4438d47751d0f1d5aaae3d39bd416.zip | |
Merge v5.6-rc5 into drm-next
Requested my mripard for some misc patches that need this as a base.
Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'arch/csky/include/asm/stackprotector.h')
| -rw-r--r-- | arch/csky/include/asm/stackprotector.h | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/arch/csky/include/asm/stackprotector.h b/arch/csky/include/asm/stackprotector.h new file mode 100644 index 000000000000..d7cd4e51edd9 --- /dev/null +++ b/arch/csky/include/asm/stackprotector.h @@ -0,0 +1,29 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_STACKPROTECTOR_H +#define _ASM_STACKPROTECTOR_H 1 + +#include <linux/random.h> +#include <linux/version.h> + +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; + canary &= CANARY_MASK; + + current->stack_canary = canary; + __stack_chk_guard = current->stack_canary; +} + +#endif /* __ASM_SH_STACKPROTECTOR_H */ |