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82cb2c1ad9
To make software license auditing simpler, use SPDX[0] license identifiers instead of duplicating the license text in every file. NOTE: Files that have been imported by FreeBSD have not been modified. [0]: https://spdx.org/ Change-Id: I80a00e1f641b8cc075ca5a95b10607ed9ed8761a Signed-off-by: dp-arm <dimitris.papastamos@arm.com>
32 lines
673 B
C
32 lines
673 B
C
/*
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* Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <arch_helpers.h>
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#include <debug.h>
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#include <utils.h>
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#include "juno_decl.h"
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#include "juno_def.h"
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u_register_t plat_get_stack_protector_canary(void)
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{
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u_register_t c[TRNG_NBYTES / sizeof(u_register_t)];
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u_register_t ret = 0;
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size_t i;
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if (juno_getentropy(c, sizeof(c)) != 0) {
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ERROR("Not enough entropy to initialize canary value\n");
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panic();
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}
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/*
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* On Juno we get 128-bits of entropy in one round.
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* Fuse the values together to form the canary.
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*/
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for (i = 0; i < ARRAY_SIZE(c); i++)
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ret ^= c[i];
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return ret;
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}
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