From nobody Mon Feb 9 11:48:00 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 45842C88CB2 for ; Mon, 12 Jun 2023 20:51:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238651AbjFLUvz (ORCPT ); Mon, 12 Jun 2023 16:51:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35340 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238348AbjFLUtt (ORCPT ); Mon, 12 Jun 2023 16:49:49 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 270461FF9 for ; Mon, 12 Jun 2023 13:47:04 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 17C8362F2F for ; Mon, 12 Jun 2023 20:45:18 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 222A1C43322; Mon, 12 Jun 2023 20:45:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1686602717; bh=bQS8cm6R4ZJj57jb4seR4/kdTmFK/qogLto2vrQ2RK0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Gvuc8+uYT+WCMgiB9xsi9XD7tpYo8Zq6fFhBt/EZw2SAoh8Ol5VXxiF1htD3HsNAh eJezIx3fKjwXlVsowJhWJPGhFua79KnPlRTK6pb+8lBPZ3+OMobgL2NUWJpLVzU5cv hcIYxaB4njxK6k8SX6RM9f/flHgseejA/rqyMZxcY/dKbdHl90+o46a5SX8irQj98Z oP0wRyHKAXnxkCw69P72lqI2eGtZ7aT71nA+3HQPHZUK9x0y+q/tzsXj/1Uy135SFj jFz58wjWAMBWP8dfU9Xe4jf44GbonmDGIU+VrEfJSQ5BqU7gmZYm+q7FBIuijy8oX7 6RvLz+1g7HxMA== Received: by paulmck-ThinkPad-P17-Gen-1.home (Postfix, from userid 1000) id F1AD2CE3A7B; Mon, 12 Jun 2023 13:45:15 -0700 (PDT) From: "Paul E. McKenney" To: linux-kernel@vger.kernel.org Cc: gwml@vger.gnuweeb.org, kernel-team@meta.com, w@lwt.eu, =?UTF-8?q?Thomas=20Wei=C3=9Fschuh?= , Willy Tarreau , "Paul E . McKenney" Subject: [PATCH v2 nolibc 32/53] tools/nolibc: fix segfaults on compilers without attribute no_stack_protector Date: Mon, 12 Jun 2023 13:44:53 -0700 Message-Id: <20230612204514.292087-32-paulmck@kernel.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <8b757cc0-3719-4e63-a755-9710384137bc@paulmck-laptop> References: <8b757cc0-3719-4e63-a755-9710384137bc@paulmck-laptop> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Thomas Wei=C3=9Fschuh Not all compilers, notably GCC < 10, have support for __attribute__((no_stack_protector)). Fall back to a mechanism that also works there. Tested with GCC 9.5.0 from kernel.org crosstools. Signed-off-by: Thomas Wei=C3=9Fschuh Signed-off-by: Willy Tarreau Signed-off-by: Paul E. McKenney --- tools/include/nolibc/arch-aarch64.h | 2 +- tools/include/nolibc/arch-arm.h | 2 +- tools/include/nolibc/arch-i386.h | 2 +- tools/include/nolibc/arch-loongarch.h | 2 +- tools/include/nolibc/arch-mips.h | 2 +- tools/include/nolibc/arch-riscv.h | 2 +- tools/include/nolibc/arch-x86_64.h | 2 +- tools/include/nolibc/compiler.h | 10 ++++++++++ tools/include/nolibc/stackprotector.h | 2 +- 9 files changed, 18 insertions(+), 8 deletions(-) diff --git a/tools/include/nolibc/arch-aarch64.h b/tools/include/nolibc/arc= h-aarch64.h index 64ec65b4ee38..11f294a406b7 100644 --- a/tools/include/nolibc/arch-aarch64.h +++ b/tools/include/nolibc/arch-aarch64.h @@ -175,7 +175,7 @@ char **environ __attribute__((weak)); const unsigned long *_auxv __attribute__((weak)); =20 /* startup code */ -void __attribute__((weak,noreturn,optimize("omit-frame-pointer"),no_stack_= protector)) _start(void) +void __attribute__((weak,noreturn,optimize("omit-frame-pointer"))) __no_st= ack_protector _start(void) { __asm__ volatile ( #ifdef _NOLIBC_STACKPROTECTOR diff --git a/tools/include/nolibc/arch-arm.h b/tools/include/nolibc/arch-ar= m.h index 924169522cf7..45b89ffe8247 100644 --- a/tools/include/nolibc/arch-arm.h +++ b/tools/include/nolibc/arch-arm.h @@ -202,7 +202,7 @@ char **environ __attribute__((weak)); const unsigned long *_auxv __attribute__((weak)); =20 /* startup code */ -void __attribute__((weak,noreturn,optimize("omit-frame-pointer"),no_stack_= protector)) _start(void) +void __attribute__((weak,noreturn,optimize("omit-frame-pointer"))) __no_st= ack_protector _start(void) { __asm__ volatile ( #ifdef _NOLIBC_STACKPROTECTOR diff --git a/tools/include/nolibc/arch-i386.h b/tools/include/nolibc/arch-i= 386.h index 37f813912957..3d672d925e9e 100644 --- a/tools/include/nolibc/arch-i386.h +++ b/tools/include/nolibc/arch-i386.h @@ -190,7 +190,7 @@ const unsigned long *_auxv __attribute__((weak)); * 2) The deepest stack frame should be set to zero * */ -void __attribute__((weak,noreturn,optimize("omit-frame-pointer"),no_stack_= protector)) _start(void) +void __attribute__((weak,noreturn,optimize("omit-frame-pointer"))) __no_st= ack_protector _start(void) { __asm__ volatile ( #ifdef _NOLIBC_STACKPROTECTOR diff --git a/tools/include/nolibc/arch-loongarch.h b/tools/include/nolibc/a= rch-loongarch.h index d8ea7e787df4..ad3f266e7093 100644 --- a/tools/include/nolibc/arch-loongarch.h +++ b/tools/include/nolibc/arch-loongarch.h @@ -172,7 +172,7 @@ const unsigned long *_auxv __attribute__((weak)); #endif =20 /* startup code */ -void __attribute__((weak,noreturn,optimize("omit-frame-pointer"),no_stack_= protector)) _start(void) +void __attribute__((weak,noreturn,optimize("omit-frame-pointer"))) __no_st= ack_protector _start(void) { __asm__ volatile ( #ifdef _NOLIBC_STACKPROTECTOR diff --git a/tools/include/nolibc/arch-mips.h b/tools/include/nolibc/arch-m= ips.h index 9860236e5340..db24e0837a39 100644 --- a/tools/include/nolibc/arch-mips.h +++ b/tools/include/nolibc/arch-mips.h @@ -182,7 +182,7 @@ char **environ __attribute__((weak)); const unsigned long *_auxv __attribute__((weak)); =20 /* startup code, note that it's called __start on MIPS */ -void __attribute__((weak,noreturn,optimize("omit-frame-pointer"),no_stack_= protector)) __start(void) +void __attribute__((weak,noreturn,optimize("omit-frame-pointer"))) __no_st= ack_protector __start(void) { __asm__ volatile ( /*".set nomips16\n"*/ diff --git a/tools/include/nolibc/arch-riscv.h b/tools/include/nolibc/arch-= riscv.h index 86616aeb77a0..a2e8564e66d6 100644 --- a/tools/include/nolibc/arch-riscv.h +++ b/tools/include/nolibc/arch-riscv.h @@ -180,7 +180,7 @@ char **environ __attribute__((weak)); const unsigned long *_auxv __attribute__((weak)); =20 /* startup code */ -void __attribute__((weak,noreturn,optimize("omit-frame-pointer"),no_stack_= protector)) _start(void) +void __attribute__((weak,noreturn,optimize("omit-frame-pointer"))) __no_st= ack_protector _start(void) { __asm__ volatile ( ".option push\n" diff --git a/tools/include/nolibc/arch-x86_64.h b/tools/include/nolibc/arch= -x86_64.h index 485a7ff72a87..6fc4d8392742 100644 --- a/tools/include/nolibc/arch-x86_64.h +++ b/tools/include/nolibc/arch-x86_64.h @@ -190,7 +190,7 @@ const unsigned long *_auxv __attribute__((weak)); * 2) The deepest stack frame should be zero (the %rbp). * */ -void __attribute__((weak,noreturn,optimize("omit-frame-pointer"),no_stack_= protector)) _start(void) +void __attribute__((weak,noreturn,optimize("omit-frame-pointer"))) __no_st= ack_protector _start(void) { __asm__ volatile ( #ifdef _NOLIBC_STACKPROTECTOR diff --git a/tools/include/nolibc/compiler.h b/tools/include/nolibc/compile= r.h index 57da75cea799..beddc3665d69 100644 --- a/tools/include/nolibc/compiler.h +++ b/tools/include/nolibc/compiler.h @@ -12,4 +12,14 @@ =20 #endif /* defined(__SSP__) ... */ =20 +#if defined(__has_attribute) +# if __has_attribute(no_stack_protector) +# define __no_stack_protector __attribute__((no_stack_protector)) +# else +# define __no_stack_protector __attribute__((__optimize__("-fno-stack-p= rotector"))) +# endif +#else +# define __no_stack_protector __attribute__((__optimize__("-fno-stack-pro= tector"))) +#endif /* defined(__has_attribute) */ + #endif /* _NOLIBC_COMPILER_H */ diff --git a/tools/include/nolibc/stackprotector.h b/tools/include/nolibc/s= tackprotector.h index 0a89e2b89ca6..88f7b2d098ff 100644 --- a/tools/include/nolibc/stackprotector.h +++ b/tools/include/nolibc/stackprotector.h @@ -37,7 +37,7 @@ void __stack_chk_fail_local(void) __attribute__((weak,section(".data.nolibc_stack_chk"))) uintptr_t __stack_chk_guard; =20 -__attribute__((weak,no_stack_protector,section(".text.nolibc_stack_chk"))) +__attribute__((weak,section(".text.nolibc_stack_chk"))) __no_stack_protect= or void __stack_chk_init(void) { my_syscall3(__NR_getrandom, &__stack_chk_guard, sizeof(__stack_chk_guard)= , 0); --=20 2.40.1