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tools/nolibc: disable function sanitizer for _start_c()

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Both constructors and main() may be executed with different function
signatures than they are actually using.
This is intentional but trips up UBSAN.

Disable the function sanitizer of UBSAN in _start_c().

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250419-nolibc-ubsan-v2-3-060b8a016917@weissschuh.net
This commit is contained in:
Thomas Weißschuh 2025-04-19 12:46:20 +02:00
parent f4152715dc
commit 9fca5554af
1 changed files with 5 additions and 0 deletions
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5
tools/include/nolibc/crt.h
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@ -7,6 +7,8 @@
#ifndef _NOLIBC_CRT_H
#define _NOLIBC_CRT_H
#include "compiler.h"
char **environ __attribute__((weak));
const unsigned long *_auxv __attribute__((weak));
@ -25,6 +27,9 @@ extern void (*const __fini_array_end[])(void) __attribute__((weak));
void _start_c(long *sp);
__attribute__((weak,used))
#if __nolibc_has_feature(undefined_behavior_sanitizer)
__attribute__((no_sanitize("function")))
#endif
void _start_c(long *sp)
{
long argc;