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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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dcb677c3d3
This allows to generate smaller text/data/dec size. As the _start_c() function added by crt.h, __stack_chk_init() is called from _start_c() instead of the assembly _start. So, it is able to mark it with static now. Reviewed-by: Thomas Weißschuh <linux@weissschuh.net> Signed-off-by: Zhangjin Wu <falcon@tinylab.org> Signed-off-by: Willy Tarreau <w@1wt.eu>
51 lines
1.4 KiB
C
51 lines
1.4 KiB
C
/* 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 "compiler.h"
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#if defined(_NOLIBC_STACKPROTECTOR)
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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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static __no_stack_protector 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, ensure the guard is never 0 */
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if (__stack_chk_guard != (uintptr_t) &__stack_chk_guard)
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__stack_chk_guard ^= (uintptr_t) &__stack_chk_guard;
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}
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#else /* !defined(_NOLIBC_STACKPROTECTOR) */
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static void __stack_chk_init(void) {}
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#endif /* defined(_NOLIBC_STACKPROTECTOR) */
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#endif /* _NOLIBC_STACKPROTECTOR_H */
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