linux-kernel - [RFC PATCH 29/34] x86/bugs: Add attack vector controls for spectre_v2

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: <20240912190857.235849-30-david.kaplan@amd.com>
Date: Thu, 12 Sep 2024 14:08:52 -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>
Subject: [RFC PATCH 29/34] x86/bugs: Add attack vector controls for spectre_v2_user

Use attack vector controls to determine if spectre_v2_user mitigation is
required.

Signed-off-by: David Kaplan <david.kaplan@....com>
---
 arch/x86/kernel/cpu/bugs.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index 2659feb33090..9859f650f25f 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -1530,6 +1530,13 @@ spectre_v2_user_select_mitigation(void)
 		spectre_v2_user_stibp = SPECTRE_V2_USER_STRICT;
 		break;
 	case SPECTRE_V2_USER_CMD_AUTO:
+		if (should_mitigate_vuln(SPECTRE_V2_USER)) {
+			spectre_v2_user_ibpb = SPECTRE_V2_USER_PRCTL;
+			spectre_v2_user_stibp = SPECTRE_V2_USER_PRCTL;
+		} else {
+			return;
+		}
+		break;
 	case SPECTRE_V2_USER_CMD_PRCTL:
 		spectre_v2_user_ibpb = SPECTRE_V2_USER_PRCTL;
 		spectre_v2_user_stibp = SPECTRE_V2_USER_PRCTL;
-- 
2.34.1