From nobody Tue Feb 10 05:17:03 2026 Received: from todd.t-8ch.de (todd.t-8ch.de [159.69.126.157]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CEF79194AE6 for ; Mon, 12 Aug 2024 20:50:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=159.69.126.157 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723495830; cv=none; b=UrKtYZfcemoVLpo9oGSFHSUmX0H/+8+ib7ta4R0vOpQgIXyEsCYCrmKHfzj539ov921+RtNvU/YeGtxKg10p9rLFhDNzS/ocyAfrtKW/jKqH9JYpvmiZym88kOqUTTp6GL7RjiAUaGTbCnpPNf30VLelzh5y69/QWAUV/b4I8hI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723495830; c=relaxed/simple; bh=/6UR9g86XgMBxrxchwxIH+6QiNLYmtw9EUkdltAltxY=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=f7ESdU6ssgTVtwpVWlf55062ZXrTKoi0HTFnFsSiHcl2K1ZRElUVakNbbCc4IBeNWEy4XxpHMxZhe6rvmBEsYabYuVbFPZ5vqkk/dLGps2oC4GUQOu2IkIcIDLiTNxTTXYq1zVNqAwrJzMKLYOE9VTkWGoSHXn5Po9n9Svgedv4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=weissschuh.net; spf=pass smtp.mailfrom=weissschuh.net; dkim=pass (1024-bit key) header.d=weissschuh.net header.i=@weissschuh.net header.b=SVjhD+ox; arc=none smtp.client-ip=159.69.126.157 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=weissschuh.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=weissschuh.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=weissschuh.net header.i=@weissschuh.net header.b="SVjhD+ox" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=weissschuh.net; s=mail; t=1723495825; bh=/6UR9g86XgMBxrxchwxIH+6QiNLYmtw9EUkdltAltxY=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=SVjhD+oxE/Z6fpR8Qx6Odbc9QLFZ7aEky5n+RMi/ATgcjwu6fH/2xOrVe/J8rYKXC 3p9HR/6Y/BtrvtbjBiNQnWK75DCL98wxN/IiqyhJXnHUYm5nJFQAF4zOnHCprD/BVX XZbRPBXm9YhUPA8nUHpMsxkLjr8XlJYvpMk4YrOU= From: =?utf-8?q?Thomas_Wei=C3=9Fschuh?= Date: Mon, 12 Aug 2024 22:50:18 +0200 Subject: [PATCH v2 2/3] tools/nolibc: stackprotector: mark implicitly used symbols as used Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20240812-nolibc-lto-v2-2-736af7bbefa8@weissschuh.net> References: <20240812-nolibc-lto-v2-0-736af7bbefa8@weissschuh.net> In-Reply-To: <20240812-nolibc-lto-v2-0-736af7bbefa8@weissschuh.net> To: Willy Tarreau Cc: Ammar Faizi , linux-kernel@vger.kernel.org, =?utf-8?q?Thomas_Wei=C3=9Fschuh?= X-Mailer: b4 0.14.1 X-Developer-Signature: v=1; a=ed25519-sha256; t=1723495824; l=1268; i=linux@weissschuh.net; s=20221212; h=from:subject:message-id; bh=/6UR9g86XgMBxrxchwxIH+6QiNLYmtw9EUkdltAltxY=; b=OD+HTIBp9LlVZswB1833xxThdDWP2wtxNi66W2sfbN9yEPVKPWJgY9pm+/q5qobQfGg8sd9+k ob2SecVeRygA9/Qp0BjaY2bSfhhYT5wU0WGl7rviZlUocaX8cllqt/M X-Developer-Key: i=linux@weissschuh.net; a=ed25519; pk=KcycQgFPX2wGR5azS7RhpBqedglOZVgRPfdFSPB1LNw= During LTO the references from the compiler-generated prologue and epilogues to the stack protector symbols are not visible and the symbols are removed. This will then lead to errors during linking. As those symbols are already #ifdeffed-out if unused mark them as "used" to prevent their removal. Signed-off-by: Thomas Wei=C3=9Fschuh --- tools/include/nolibc/stackprotector.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tools/include/nolibc/stackprotector.h b/tools/include/nolibc/s= tackprotector.h index 13f1d0e60387..1d0d5259ec41 100644 --- a/tools/include/nolibc/stackprotector.h +++ b/tools/include/nolibc/stackprotector.h @@ -18,7 +18,7 @@ * triggering stack protector errors themselves */ =20 -__attribute__((weak,noreturn,section(".text.nolibc_stack_chk"))) +__attribute__((weak,used,noreturn,section(".text.nolibc_stack_chk"))) void __stack_chk_fail(void) { pid_t pid; @@ -34,7 +34,7 @@ void __stack_chk_fail_local(void) __stack_chk_fail(); } =20 -__attribute__((weak,section(".data.nolibc_stack_chk"))) +__attribute__((weak,used,section(".data.nolibc_stack_chk"))) uintptr_t __stack_chk_guard; =20 static __no_stack_protector void __stack_chk_init(void) --=20 2.46.0