linux-kernel - [PATCH AUTOSEL 6.6 040/294] x86/stackprotector/64: Only export __ref_stack_chk_guard on CONFIG

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20250505225634.2688578-40-sashal@kernel.org>
Date: Mon,  5 May 2025 18:52:20 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Ingo Molnar <mingo@...nel.org>,
	Brian Gerst <brgerst@...il.com>,
	Ard Biesheuvel <ardb@...nel.org>,
	Uros Bizjak <ubizjak@...il.com>,
	Sasha Levin <sashal@...nel.org>,
	luto@...nel.org,
	tglx@...utronix.de,
	mingo@...hat.com,
	bp@...en8.de,
	dave.hansen@...ux.intel.com,
	x86@...nel.org
Subject: [PATCH AUTOSEL 6.6 040/294] x86/stackprotector/64: Only export __ref_stack_chk_guard on CONFIG_SMP

From: Ingo Molnar <mingo@...nel.org>

[ Upstream commit 91d5451d97ce35cbd510277fa3b7abf9caa4e34d ]

The __ref_stack_chk_guard symbol doesn't exist on UP:

  <stdin>:4:15: error: ‘__ref_stack_chk_guard’ undeclared here (not in a function)

Fix the #ifdef around the entry.S export.

Signed-off-by: Ingo Molnar <mingo@...nel.org>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Ard Biesheuvel <ardb@...nel.org>
Cc: Uros Bizjak <ubizjak@...il.com>
Link: https://lore.kernel.org/r/20250123190747.745588-8-brgerst@gmail.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/x86/entry/entry.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/entry/entry.S b/arch/x86/entry/entry.S
index 78fd2442b49dc..ad292c0d971a3 100644
--- a/arch/x86/entry/entry.S
+++ b/arch/x86/entry/entry.S
@@ -59,7 +59,7 @@ EXPORT_SYMBOL_GPL(mds_verw_sel);
  * entirely in the C code, and use an alias emitted by the linker script
  * instead.
  */
-#ifdef CONFIG_STACKPROTECTOR
+#if defined(CONFIG_STACKPROTECTOR) && defined(CONFIG_SMP)
 EXPORT_SYMBOL(__ref_stack_chk_guard);
 #endif
 #endif
-- 
2.39.5