linux-kernel - [PATCH] arm64: correct the effect of mitigations off on kpti

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Date:   Fri, 24 Jun 2022 09:20:48 +0800
From:   Liu Song <liusong@...ux.alibaba.com>
To:     corbet@....net, will@...nel.org
Cc:     linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] arm64: correct the effect of mitigations off on kpti

From: Liu Song <liusong@...ux.alibaba.com>

If KASLR is enabled, then kpti will be forced to be enabled even if
mitigations off, so we need to adjust the description of this parameter.

Signed-off-by: Liu Song <liusong@...ux.alibaba.com>
---
 Documentation/admin-guide/kernel-parameters.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 8090130..5b9e7f3 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -3162,7 +3162,7 @@
 				improves system performance, but it may also
 				expose users to several CPU vulnerabilities.
 				Equivalent to: nopti [X86,PPC]
-					       kpti=0 [ARM64]
+					       if nokaslr then kpti=0 [ARM64]
 					       nospectre_v1 [X86,PPC]
 					       nobp=0 [S390]
 					       nospectre_v2 [X86,PPC,S390,ARM64]
-- 
1.8.3.1