diff options
Diffstat (limited to 'plat/arm/board/fvp/fvp_stack_protector.c')
-rw-r--r-- | plat/arm/board/fvp/fvp_stack_protector.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/plat/arm/board/fvp/fvp_stack_protector.c b/plat/arm/board/fvp/fvp_stack_protector.c new file mode 100644 index 00000000..1e8e3010 --- /dev/null +++ b/plat/arm/board/fvp/fvp_stack_protector.c @@ -0,0 +1,23 @@ +/* + * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#include <arch_helpers.h> +#include <platform.h> +#include <stdint.h> + +#define RANDOM_CANARY_VALUE ((u_register_t) 3288484550995823360ULL) + +u_register_t plat_get_stack_protector_canary(void) +{ + /* + * Ideally, a random number should be returned instead of the + * combination of a timer's value and a compile-time constant. As the + * FVP does not have any random number generator, this is better than + * nothing but not necessarily really secure. + */ + return RANDOM_CANARY_VALUE ^ read_cntpct_el0(); +} + |