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Diffstat (limited to '')
| -rw-r--r-- | arch/powerpc/include/asm/stackprotector.h | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/stackprotector.h b/arch/powerpc/include/asm/stackprotector.h new file mode 100644 index 000000000..1c8460e23 --- /dev/null +++ b/arch/powerpc/include/asm/stackprotector.h @@ -0,0 +1,38 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * GCC stack protector support. + * + */ + +#ifndef _ASM_STACKPROTECTOR_H +#define _ASM_STACKPROTECTOR_H + +#include <linux/random.h> +#include <linux/version.h> +#include <asm/reg.h> +#include <asm/current.h> +#include <asm/paca.h> + +/* + * 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. */ + canary = get_random_canary(); + canary ^= mftb(); + canary ^= LINUX_VERSION_CODE; + canary &= CANARY_MASK; + + current->stack_canary = canary; +#ifdef CONFIG_PPC64 + get_paca()->canary = canary; +#endif +} + +#endif /* _ASM_STACKPROTECTOR_H */ |