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>
59 lines
1.5 KiB
C
59 lines
1.5 KiB
C
/*
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* Copyright (c) 2018 Intel Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @file
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* @brief Thread entry
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*
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* This file provides the common thread entry function
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*/
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#include <zephyr/kernel.h>
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#ifdef CONFIG_THREAD_LOCAL_STORAGE
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#include <zephyr/random/rand32.h>
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__thread k_tid_t z_tls_current;
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#endif
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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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#endif /* CONFIG_STACK_CANARIES_TLS */
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/*
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* Common thread entry point function (used by all threads)
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*
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* This routine invokes the actual thread entry point function and passes
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* it three arguments. It also handles graceful termination of the thread
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* if the entry point function ever returns.
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*
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* This routine does not return, and is marked as such so the compiler won't
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* generate preamble code that is only used by functions that actually return.
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*/
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FUNC_NORETURN void z_thread_entry(k_thread_entry_t entry,
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void *p1, void *p2, void *p3)
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{
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#ifdef CONFIG_THREAD_LOCAL_STORAGE
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z_tls_current = z_current_get();
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#endif
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#ifdef CONFIG_STACK_CANARIES_TLS
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uintptr_t stack_guard;
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sys_rand_get((uint8_t *)&stack_guard, sizeof(stack_guard));
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__stack_chk_guard = stack_guard;
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__stack_chk_guard <<= 8;
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#endif /* CONFIG_STACK_CANARIES */
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entry(p1, p2, p3);
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k_thread_abort(k_current_get());
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/*
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* Compiler can't tell that k_thread_abort() won't return and issues a
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* warning unless we tell it that control never gets this far.
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*/
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CODE_UNREACHABLE; /* LCOV_EXCL_LINE */
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}
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