linux-kernel - [PATCH v4 26/36] x86/bugs: Add attack vector controls for gds

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: <20250310164023.779191-27-david.kaplan@amd.com>
Date: Mon, 10 Mar 2025 11:40:13 -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>
CC: <linux-kernel@...r.kernel.org>, Brendan Jackman <jackmanb@...gle.com>,
	Derek Manwaring <derekmn@...zon.com>
Subject: [PATCH v4 26/36] x86/bugs: Add attack vector controls for gds

Use attack vector controls to determine if gds mitigation is required.

Signed-off-by: David Kaplan <david.kaplan@....com>
---
 arch/x86/kernel/cpu/bugs.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index 148cac36a24b..5803c45dc15c 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -994,12 +994,15 @@ static void __init gds_select_mitigation(void)
 		return;
 	}
 
-	if (cpu_mitigations_off())
-		gds_mitigation = GDS_MITIGATION_OFF;
 	/* Will verify below that mitigation _can_ be disabled */
-
-	if (gds_mitigation == GDS_MITIGATION_AUTO)
-		gds_mitigation = GDS_MITIGATION_FULL;
+	if (gds_mitigation == GDS_MITIGATION_AUTO) {
+		if (should_mitigate_vuln(X86_BUG_GDS))
+			gds_mitigation = GDS_MITIGATION_FULL;
+		else {
+			gds_mitigation = GDS_MITIGATION_OFF;
+			return;
+		}
+	}
 
 	/* No microcode */
 	if (!(x86_arch_cap_msr & ARCH_CAP_GDS_CTRL)) {
-- 
2.34.1