d16c5b9048
Add new option to use thread local storage for stack canaries. This makes harder to find the canaries location and value. This is made optional because there is a performance and size penalty when using it. Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
76 lines
2.3 KiB
C
76 lines
2.3 KiB
C
/*
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* Copyright (c) 2010-2014 Wind River Systems, Inc.
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* Copyright (c) 2020 Intel Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <zephyr/kernel.h>
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#include <kernel_internal.h>
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#include <zephyr/linker/linker-defs.h>
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#ifdef CONFIG_STACK_CANARIES
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#ifdef CONFIG_STACK_CANARIES_TLS
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extern __thread volatile uintptr_t __stack_chk_guard;
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#else
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extern volatile uintptr_t __stack_chk_guard;
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#endif /* CONFIG_STACK_CANARIES_TLS */
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#endif /* CONFIG_STACK_CANARIES */
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/**
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* @brief Copy the data section from ROM to RAM
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*
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* This routine copies the data section from ROM to RAM.
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*/
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void z_data_copy(void)
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{
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z_early_memcpy(&__data_region_start, &__data_region_load_start,
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__data_region_end - __data_region_start);
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#ifdef CONFIG_ARCH_HAS_RAMFUNC_SUPPORT
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z_early_memcpy(&__ramfunc_start, &__ramfunc_load_start,
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(uintptr_t) &__ramfunc_size);
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#endif /* CONFIG_ARCH_HAS_RAMFUNC_SUPPORT */
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#if DT_NODE_HAS_STATUS(DT_CHOSEN(zephyr_ccm), okay)
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z_early_memcpy(&__ccm_data_start, &__ccm_data_rom_start,
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__ccm_data_end - __ccm_data_start);
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#endif
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#if DT_NODE_HAS_STATUS(DT_CHOSEN(zephyr_itcm), okay)
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z_early_memcpy(&__itcm_start, &__itcm_load_start,
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(uintptr_t) &__itcm_size);
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#endif
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#if DT_NODE_HAS_STATUS(DT_CHOSEN(zephyr_dtcm), okay)
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z_early_memcpy(&__dtcm_data_start, &__dtcm_data_load_start,
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__dtcm_data_end - __dtcm_data_start);
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#endif
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#ifdef CONFIG_CODE_DATA_RELOCATION
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extern void data_copy_xip_relocation(void);
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data_copy_xip_relocation();
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#endif /* CONFIG_CODE_DATA_RELOCATION */
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#ifdef CONFIG_USERSPACE
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#ifdef CONFIG_STACK_CANARIES
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/* stack canary checking is active for all C functions.
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* __stack_chk_guard is some uninitialized value living in the
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* app shared memory sections. Preserve it, and don't make any
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* function calls to perform the memory copy. The true canary
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* value gets set later in z_cstart().
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*/
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uintptr_t guard_copy = __stack_chk_guard;
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uint8_t *src = (uint8_t *)&_app_smem_rom_start;
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uint8_t *dst = (uint8_t *)&_app_smem_start;
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uint32_t count = _app_smem_end - _app_smem_start;
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guard_copy = __stack_chk_guard;
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while (count > 0) {
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*(dst++) = *(src++);
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count--;
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}
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__stack_chk_guard = guard_copy;
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#else
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z_early_memcpy(&_app_smem_start, &_app_smem_rom_start,
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_app_smem_end - _app_smem_start);
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#endif /* CONFIG_STACK_CANARIES */
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#endif /* CONFIG_USERSPACE */
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}
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