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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/qemu/common/qemu_stack_protector.c | |
parent | Initial commit. (diff) | |
download | arm-trusted-firmware-102b0d2daa97dae68d3eed54d8fe37a9cc38a892.tar.xz arm-trusted-firmware-102b0d2daa97dae68d3eed54d8fe37a9cc38a892.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/qemu/common/qemu_stack_protector.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/plat/qemu/common/qemu_stack_protector.c b/plat/qemu/common/qemu_stack_protector.c new file mode 100644 index 0000000..15ce3d6 --- /dev/null +++ b/plat/qemu/common/qemu_stack_protector.c @@ -0,0 +1,32 @@ +/* + * Copyright (c) 2021, ARM Limited and Contributors. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#include <stdint.h> + +#include <arch_helpers.h> +#include <arch_features.h> +#include <plat/common/platform.h> + +#define RANDOM_CANARY_VALUE ((u_register_t) 3288484550995823360ULL) + +u_register_t plat_get_stack_protector_canary(void) +{ +#if ENABLE_FEAT_RNG + /* Use the RNDR instruction if the CPU supports it */ + if (is_armv8_5_rng_present()) { + return read_rndr(); + } +#endif + + /* + * Ideally, a random number should be returned above. If a random + * number generator is not supported, return instead a + * combination of a timer's value and a compile-time constant. + * This is better than nothing but not necessarily really secure. + */ + return RANDOM_CANARY_VALUE ^ read_cntpct_el0(); +} + |