Contributors: 5
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Thomas Weißschuh |
151 |
84.83% |
7 |
41.18% |
| Zhangjin Wu |
10 |
5.62% |
3 |
17.65% |
| Willy Tarreau |
7 |
3.93% |
4 |
23.53% |
| Benjamin Berg |
6 |
3.37% |
1 |
5.88% |
| Daniel Palmer |
4 |
2.25% |
2 |
11.76% |
| Total |
178 |
|
17 |
|
/* 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 */