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826ba363c4
It uses the system timer as "entropy" source in the same way as QEMU, layerscape and others. Change-Id: Icda17b78e85255bea96109ca2ee0e091187d62ac Signed-off-by: Christoph Müllner <christophm30@gmail.com>
24 lines
658 B
C
24 lines
658 B
C
/*
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* Copyright (c) 2018-2020, 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 <stdint.h>
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#include <arch_helpers.h>
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#include <plat/common/platform.h>
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#define RANDOM_CANARY_VALUE ((u_register_t) 3288484550995823360ULL)
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u_register_t plat_get_stack_protector_canary(void)
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{
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/*
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* Ideally, a random number should be returned instead of the
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* combination of a timer's value and a compile-time constant.
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* As the virt platform does not have any random number generator,
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* this is better than nothing but not necessarily really secure.
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*/
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return RANDOM_CANARY_VALUE ^ read_cntpct_el0();
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}
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