linux-kernel - [RFC PATCH v2 1/6] x86/mm: add a pti_disable entry in mm_context

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Date:   Tue,  9 Jan 2018 13:56:15 +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 v2 1/6] x86/mm: add a pti_disable entry in mm_context_t

This will be set/cleared using arch_prctl() to allow the tasks using
this mm to disable the PTI protection.

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>
---
 arch/x86/include/asm/mmu.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/x86/include/asm/mmu.h b/arch/x86/include/asm/mmu.h
index 5ff3e8a..c7c2ca1 100644
--- a/arch/x86/include/asm/mmu.h
+++ b/arch/x86/include/asm/mmu.h
@@ -36,6 +36,10 @@
 	/* True if mm supports a task running in 32 bit compatibility mode. */
 	unsigned short ia32_compat;
 #endif
+#ifdef CONFIG_PAGE_TABLE_ISOLATION
+	/* True if mm is forced to run with page table isolation disabled */
+	char pti_disable;
+#endif
 
 	struct mutex lock;
 	void __user *vdso;			/* vdso base address */
-- 
1.7.12.1