2018-01-06 14:13:39 +00:00
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From 9378cf5830b41fc4659335da883d2a1d52fe0661 Mon Sep 17 00:00:00 2001
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From: Andy Lutomirski <luto@kernel.org>
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Date: Fri, 15 Dec 2017 22:08:18 +0100
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2018-01-07 12:17:59 +00:00
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Subject: [PATCH 201/233] x86/mm/pti: Map ESPFIX into user space
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2018-01-06 14:13:39 +00:00
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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CVE-2017-5754
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Map the ESPFIX pages into user space when PTI is enabled.
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Signed-off-by: Andy Lutomirski <luto@kernel.org>
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Cc: Borislav Petkov <bp@alien8.de>
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Cc: Brian Gerst <brgerst@gmail.com>
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Cc: Dave Hansen <dave.hansen@linux.intel.com>
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Cc: David Laight <David.Laight@aculab.com>
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Cc: H. Peter Anvin <hpa@zytor.com>
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Cc: Josh Poimboeuf <jpoimboe@redhat.com>
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Cc: Juergen Gross <jgross@suse.com>
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Cc: Kees Cook <keescook@chromium.org>
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Cc: Linus Torvalds <torvalds@linux-foundation.org>
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Cc: Peter Zijlstra <peterz@infradead.org>
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Signed-off-by: Ingo Molnar <mingo@kernel.org>
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(cherry picked from commit 4b6bbe95b87966ba08999574db65c93c5e925a36)
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Signed-off-by: Andy Whitcroft <apw@canonical.com>
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Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
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(cherry picked from commit f5103cc3035ae6d1816404696ee2eb06d53b6709)
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Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
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---
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arch/x86/mm/pti.c | 11 +++++++++++
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1 file changed, 11 insertions(+)
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diff --git a/arch/x86/mm/pti.c b/arch/x86/mm/pti.c
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index 0e78797650a7..b1c38ef9fbbb 100644
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--- a/arch/x86/mm/pti.c
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+++ b/arch/x86/mm/pti.c
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@@ -287,6 +287,16 @@ static void __init pti_clone_user_shared(void)
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pti_clone_p4d(CPU_ENTRY_AREA_BASE);
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}
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+/*
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+ * Clone the ESPFIX P4D into the user space visinble page table
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+ */
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+static void __init pti_setup_espfix64(void)
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+{
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+#ifdef CONFIG_X86_ESPFIX64
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+ pti_clone_p4d(ESPFIX_BASE_ADDR);
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+#endif
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+}
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+
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/*
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* Clone the populated PMDs of the entry and irqentry text and force it RO.
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*/
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@@ -308,4 +318,5 @@ void __init pti_init(void)
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pti_clone_user_shared();
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pti_clone_entry_text();
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+ pti_setup_espfix64();
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}
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--
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2.14.2
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