linux-kernel - [PATCH] x86/bugs: Qualify RETBLEED_INTEL

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>] [day] [month] [year] [list]

Message-ID: <20251003171936.155391-1-david.kaplan@amd.com>
Date: Fri, 3 Oct 2025 12:19:36 -0500
From: David Kaplan <david.kaplan@....com>
To: Thomas Gleixner <tglx@...utronix.de>, Borislav Petkov <bp@...en8.de>,
	Peter Zijlstra <peterz@...radead.org>, Josh Poimboeuf <jpoimboe@...nel.org>,
	Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>, Ingo Molnar
	<mingo@...hat.com>, Dave Hansen <dave.hansen@...ux.intel.com>,
	<x86@...nel.org>, "H . Peter Anvin" <hpa@...or.com>, Klaus Kusche
	<klaus.kusche@...puterix.info>
CC: <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86/bugs: Qualify RETBLEED_INTEL_MSG

When retbleed mitigation is disabled, the kernel already prints an info
message that the system is vulnerable.  Recent code restructuring also
inadvertently led to RETBLEED_INTEL_MSG being printed as an error, which is
unnecessary as retbleed mitigation was already explicitly disabled (by
config option, cmdline, etc.).

Qualify this print statement so the warning is not printed unless an actual
retbleed mitigation was selected and is being disabled due to
incompatibility with spectre_v2.

Closes: https://bugzilla.kernel.org/show_bug.cgi?id=220624
Signed-off-by: David Kaplan <david.kaplan@....com>
---
 arch/x86/kernel/cpu/bugs.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index 6a526ae1fe99..e08de5b0d20b 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -1463,7 +1463,9 @@ static void __init retbleed_update_mitigation(void)
 			break;
 		default:
 			if (retbleed_mitigation != RETBLEED_MITIGATION_STUFF) {
-				pr_err(RETBLEED_INTEL_MSG);
+				if (retbleed_mitigation != RETBLEED_MITIGATION_NONE)
+					pr_err(RETBLEED_INTEL_MSG);
+
 				retbleed_mitigation = RETBLEED_MITIGATION_NONE;
 			}
 		}

base-commit: d501f68c45ee1505c4a94c68051387ffa32c9a21
-- 
2.34.1