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With -Wmissing-prototypes the compiler will warn about non-static functions which don't have a prototype defined. This warning doesn't make much sense for nolibc itself but for user code it is still useful. To pacify the compiler add prototypes next to the function definitions, similar to how it is handled elsewhere in the kernel. Acked-by: Willy Tarreau <w@1wt.eu> Link: https://lore.kernel.org/r/20250123-nolibc-prototype-v1-1-e1afc5c1999a@weissschuh.net Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
54 lines
1.5 KiB
C
54 lines
1.5 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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void __stack_chk_fail(void);
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__attribute__((weak,used,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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void __stack_chk_fail_local(void);
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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,used,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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