linux-kernel - [RFC PATCH v3 2/8] x86/pti: add new config option PER_PROCESS

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Date:   Wed, 10 Jan 2018 20:28:14 +0100
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, x86@...nel.org
Cc:     Willy Tarreau <w@....eu>, Andy Lutomirski <luto@...nel.org>,
        Borislav Petkov <bp@...en8.de>,
        Brian Gerst <brgerst@...il.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ingo Molnar <mingo@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, Kees Cook <keescook@...omium.org>
Subject: [RFC PATCH v3 2/8] x86/pti: add new config option PER_PROCESS_PTI

This option will expose a sysctl allowing to adjust PTI per
process at run time.

Signed-off-by: Willy Tarreau <w@....eu>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: Kees Cook <keescook@...omium.org>
---
 security/Kconfig | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/security/Kconfig b/security/Kconfig
index 3d4debd..64adb48 100644
--- a/security/Kconfig
+++ b/security/Kconfig
@@ -65,6 +65,18 @@ config PAGE_TABLE_ISOLATION
 
 	  See Documentation/x86/pagetable-isolation.txt for more details.
 
+config PER_PROCESS_PTI
+	bool "Allow page table isolation to be adjusted per process"
+	default n
+	depends on PAGE_TABLE_ISOLATION
+	help
+	  This feature exposes a sysctl permitting administrators to
+	  specifically exempt certain critical tasks from the PTI
+	  protection at the risk of trading security for a marginal
+	  performance increase for I/O intensive applications.
+
+	  If you are unsure how to answer this question, answer N.
+
 config SECURITY_INFINIBAND
 	bool "Infiniband Security Hooks"
 	depends on SECURITY && INFINIBAND
-- 
1.7.12.1