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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 09:13:47 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 09:13:47 +0000 |
commit | 102b0d2daa97dae68d3eed54d8fe37a9cc38a892 (patch) | |
tree | bcf648efac40ca6139842707f0eba5a4496a6dd2 /plat/rpi/common/rpi3_stack_protector.c | |
parent | Initial commit. (diff) | |
download | arm-trusted-firmware-upstream.tar.xz arm-trusted-firmware-upstream.zip |
Adding upstream version 2.8.0+dfsg.upstream/2.8.0+dfsgupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | plat/rpi/common/rpi3_stack_protector.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/plat/rpi/common/rpi3_stack_protector.c b/plat/rpi/common/rpi3_stack_protector.c new file mode 100644 index 0000000..aae5fac --- /dev/null +++ b/plat/rpi/common/rpi3_stack_protector.c @@ -0,0 +1,29 @@ +/* + * Copyright (c) 2017-2019, ARM Limited and Contributors. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#include <stdint.h> + +#include <lib/utils.h> +#include <lib/utils_def.h> + +#include <drivers/rpi3/rng/rpi3_rng.h> + +/* Get 128 bits of entropy and fuse the values together to form the canary. */ +#define TRNG_NBYTES 16U + +u_register_t plat_get_stack_protector_canary(void) +{ + size_t i; + u_register_t buf[TRNG_NBYTES / sizeof(u_register_t)]; + u_register_t ret = 0U; + + rpi3_rng_read(buf, sizeof(buf)); + + for (i = 0U; i < ARRAY_SIZE(buf); i++) + ret ^= buf[i]; + + return ret; +} |