Commit 71dc301c authored by David Kaplan's avatar David Kaplan Committed by Borislav Petkov (AMD)
Browse files

x86/bugs: Add attack vector controls for SRBDS 



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

Signed-off-by: default avatarDavid Kaplan <david.kaplan@amd.com>
Signed-off-by: default avatarBorislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/20250707183316.1349127-10-david.kaplan@amd.com
parent 54b53dca

arch/x86/kernel/cpu/bugs.c

+9 −3
Original line number Diff line number Diff line
@@ -870,13 +870,19 @@ void update_srbds_msr(void) 


static void __init srbds_select_mitigation(void)

{

	if (!boot_cpu_has_bug(X86_BUG_SRBDS) || cpu_mitigations_off()) {

	if (!boot_cpu_has_bug(X86_BUG_SRBDS)) {

		srbds_mitigation = SRBDS_MITIGATION_OFF;

		return;

	}



	if (srbds_mitigation == SRBDS_MITIGATION_AUTO)

	if (srbds_mitigation == SRBDS_MITIGATION_AUTO) {

		if (should_mitigate_vuln(X86_BUG_SRBDS))

			srbds_mitigation = SRBDS_MITIGATION_FULL;

		else {

			srbds_mitigation = SRBDS_MITIGATION_OFF;

			return;

		}

	}



	/*

	 * Check to see if this is one of the MDS_NO systems supporting TSX that