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47 lines
1.3 KiB
47 lines
1.3 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* GCC stack protector support. |
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* |
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* Stack protector works by putting predefined pattern at the start of |
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* the stack frame and verifying that it hasn't been overwritten when |
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* returning from the function. The pattern is called stack canary |
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* and gcc expects it to be defined by a global variable called |
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* "__stack_chk_guard" on ARM. This unfortunately means that on SMP |
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* we cannot have a different canary value per task. |
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*/ |
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#ifndef __ASM_STACKPROTECTOR_H |
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#define __ASM_STACKPROTECTOR_H |
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#include <linux/random.h> |
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#include <linux/version.h> |
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#include <asm/pointer_auth.h> |
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extern unsigned long __stack_chk_guard; |
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/* |
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* Initialize the stackprotector canary value. |
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* |
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* NOTE: this must only be called from functions that never return, |
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* and it must always be inlined. |
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*/ |
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static __always_inline void boot_init_stack_canary(void) |
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{ |
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#if defined(CONFIG_STACKPROTECTOR) |
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unsigned long canary; |
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/* Try to get a semi random initial value. */ |
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get_random_bytes(&canary, sizeof(canary)); |
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canary ^= LINUX_VERSION_CODE; |
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canary &= CANARY_MASK; |
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current->stack_canary = canary; |
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if (!IS_ENABLED(CONFIG_STACKPROTECTOR_PER_TASK)) |
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__stack_chk_guard = current->stack_canary; |
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#endif |
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ptrauth_thread_init_kernel(current); |
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ptrauth_thread_switch_kernel(current); |
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ptrauth_enable(); |
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} |
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#endif /* _ASM_STACKPROTECTOR_H */
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