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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657/* SPDX-License-Identifier: LGPL-2.1 OR MIT *//* * Stack protector support for NOLIBC * Copyright (C) 2023 Thomas Weißschuh <linux@weissschuh.net> */
#ifndef _NOLIBC_STACKPROTECTOR_H#define _NOLIBC_STACKPROTECTOR_H
#include "compiler.h"
#ifndef NOLIBC_NO_RUNTIME#if defined(_NOLIBC_STACKPROTECTOR)
#include "sys.h"#include "stdlib.h"
/* The functions in this header are using raw syscall macros to avoid * triggering stack protector errors themselves */
void __stack_chk_fail(void);__attribute__((weak,used,noreturn,section(".text.nolibc_stack_chk")))void __stack_chk_fail(void){ pid_t pid; __nolibc_syscall3(__NR_write, STDERR_FILENO, "!!Stack smashing detected!!\n", 28); pid = __nolibc_syscall0(__NR_getpid); __nolibc_syscall2(__NR_kill, pid, SIGABRT); for (;;);}
void __stack_chk_fail_local(void);__attribute__((weak,noreturn,section(".text.nolibc_stack_chk")))void __stack_chk_fail_local(void){ __stack_chk_fail();}
__attribute__((weak,used,section(".data.nolibc_stack_chk")))uintptr_t __stack_chk_guard;
static __nolibc_no_stack_protector void __stack_chk_init(void){ __nolibc_syscall3(__NR_getrandom, &__stack_chk_guard, sizeof(__stack_chk_guard), GRND_INSECURE | GRND_NONBLOCK); /* a bit more randomness in case getrandom() fails, ensure the guard is never 0 */ if (__stack_chk_guard != (uintptr_t) &__stack_chk_guard) __stack_chk_guard ^= (uintptr_t) &__stack_chk_guard;}#else /* !defined(_NOLIBC_STACKPROTECTOR) */static void __stack_chk_init(void) {}#endif /* defined(_NOLIBC_STACKPROTECTOR) */#endif /* NOLIBC_NO_RUNTIME */
#endif /* _NOLIBC_STACKPROTECTOR_H */