/* 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 */