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54 lines
1.4 KiB
C
54 lines
1.4 KiB
C
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/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
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/*
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* Stack protector support for NOLIBC
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* Copyright (C) 2023 Thomas Weißschuh <linux@weissschuh.net>
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*/
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#ifndef _NOLIBC_STACKPROTECTOR_H
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#define _NOLIBC_STACKPROTECTOR_H
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#include "arch.h"
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#if defined(NOLIBC_STACKPROTECTOR)
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#if !defined(__ARCH_SUPPORTS_STACK_PROTECTOR)
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#error "nolibc does not support stack protectors on this arch"
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#endif
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#include "sys.h"
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#include "stdlib.h"
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/* The functions in this header are using raw syscall macros to avoid
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* triggering stack protector errors themselves
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*/
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__attribute__((weak,noreturn,section(".text.nolibc_stack_chk")))
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void __stack_chk_fail(void)
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{
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pid_t pid;
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my_syscall3(__NR_write, STDERR_FILENO, "!!Stack smashing detected!!\n", 28);
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pid = my_syscall0(__NR_getpid);
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my_syscall2(__NR_kill, pid, SIGABRT);
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for (;;);
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}
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__attribute__((weak,noreturn,section(".text.nolibc_stack_chk")))
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void __stack_chk_fail_local(void)
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{
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__stack_chk_fail();
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}
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__attribute__((weak,section(".data.nolibc_stack_chk")))
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uintptr_t __stack_chk_guard;
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__attribute__((weak,no_stack_protector,section(".text.nolibc_stack_chk")))
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void __stack_chk_init(void)
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{
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my_syscall3(__NR_getrandom, &__stack_chk_guard, sizeof(__stack_chk_guard), 0);
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/* a bit more randomness in case getrandom() fails */
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__stack_chk_guard ^= (uintptr_t) &__stack_chk_guard;
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}
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#endif // defined(NOLIBC_STACKPROTECTOR)
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#endif // _NOLIBC_STACKPROTECTOR_H
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