From 9fca5554af70fd86fb1ed78362d86ebd1a4be2ef Mon Sep 17 00:00:00 2001 From: =?utf8?q?Thomas=20Wei=C3=9Fschuh?= Date: Sat, 19 Apr 2025 12:46:20 +0200 Subject: [PATCH] tools/nolibc: disable function sanitizer for _start_c() MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Acked-by: Willy Tarreau Link: https://lore.kernel.org/r/20250419-nolibc-ubsan-v2-3-060b8a016917@weissschuh.net --- tools/include/nolibc/crt.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/tools/include/nolibc/crt.h b/tools/include/nolibc/crt.h index c4b10103bbec..961cfe777c35 100644 --- a/tools/include/nolibc/crt.h +++ b/tools/include/nolibc/crt.h @@ -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; -- 2.25.1