2018-01-06 17:13:39 +03:00
|
|
|
From 4eeffdaf7e8e034633bab44f61c5f92002179d28 Mon Sep 17 00:00:00 2001
|
|
|
|
|
From: Thomas Gleixner <tglx@linutronix.de>
|
|
|
|
|
Date: Mon, 4 Dec 2017 15:07:43 +0100
|
2018-01-08 12:25:09 +03:00
|
|
|
Subject: [PATCH 197/241] x86/mm/pti: Force entry through trampoline when PTI
|
2018-01-06 17:13:39 +03:00
|
|
|
active
|
|
|
|
|
MIME-Version: 1.0
|
|
|
|
|
Content-Type: text/plain; charset=UTF-8
|
|
|
|
|
Content-Transfer-Encoding: 8bit
|
|
|
|
|
|
|
|
|
|
CVE-2017-5754
|
|
|
|
|
|
|
|
|
|
Force the entry through the trampoline only when PTI is active. Otherwise
|
|
|
|
|
go through the normal entry code.
|
|
|
|
|
|
|
|
|
|
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
|
|
|
|
|
Reviewed-by: Borislav Petkov <bp@suse.de>
|
|
|
|
|
Cc: Andy Lutomirski <luto@kernel.org>
|
|
|
|
|
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
|
|
|
|
|
Cc: Borislav Petkov <bp@alien8.de>
|
|
|
|
|
Cc: Brian Gerst <brgerst@gmail.com>
|
|
|
|
|
Cc: Dave Hansen <dave.hansen@linux.intel.com>
|
|
|
|
|
Cc: David Laight <David.Laight@aculab.com>
|
|
|
|
|
Cc: Denys Vlasenko <dvlasenk@redhat.com>
|
|
|
|
|
Cc: Eduardo Valentin <eduval@amazon.com>
|
|
|
|
|
Cc: Greg KH <gregkh@linuxfoundation.org>
|
|
|
|
|
Cc: H. Peter Anvin <hpa@zytor.com>
|
|
|
|
|
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
|
|
|
|
|
Cc: Juergen Gross <jgross@suse.com>
|
|
|
|
|
Cc: Linus Torvalds <torvalds@linux-foundation.org>
|
|
|
|
|
Cc: Peter Zijlstra <peterz@infradead.org>
|
|
|
|
|
Cc: Will Deacon <will.deacon@arm.com>
|
|
|
|
|
Cc: aliguori@amazon.com
|
|
|
|
|
Cc: daniel.gruss@iaik.tugraz.at
|
|
|
|
|
Cc: hughd@google.com
|
|
|
|
|
Cc: keescook@google.com
|
|
|
|
|
Signed-off-by: Ingo Molnar <mingo@kernel.org>
|
|
|
|
|
(cherry picked from commit 8d4b067895791ab9fdb1aadfc505f64d71239dd2)
|
|
|
|
|
Signed-off-by: Andy Whitcroft <apw@canonical.com>
|
|
|
|
|
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
|
|
|
|
|
(cherry picked from commit 9ae1ea4821648be179a96fe65b3ed4bd111a5c98)
|
|
|
|
|
Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
|
|
|
|
|
---
|
|
|
|
|
arch/x86/kernel/cpu/common.c | 5 ++++-
|
|
|
|
|
1 file changed, 4 insertions(+), 1 deletion(-)
|
|
|
|
|
|
|
|
|
|
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
|
|
|
|
|
index 623ba3635793..99f37d1636ff 100644
|
|
|
|
|
--- a/arch/x86/kernel/cpu/common.c
|
|
|
|
|
+++ b/arch/x86/kernel/cpu/common.c
|
|
|
|
|
@@ -1340,7 +1340,10 @@ void syscall_init(void)
|
|
|
|
|
(entry_SYSCALL_64_trampoline - _entry_trampoline);
|
|
|
|
|
|
|
|
|
|
wrmsr(MSR_STAR, 0, (__USER32_CS << 16) | __KERNEL_CS);
|
|
|
|
|
- wrmsrl(MSR_LSTAR, SYSCALL64_entry_trampoline);
|
|
|
|
|
+ if (static_cpu_has(X86_FEATURE_PTI))
|
|
|
|
|
+ wrmsrl(MSR_LSTAR, SYSCALL64_entry_trampoline);
|
|
|
|
|
+ else
|
|
|
|
|
+ wrmsrl(MSR_LSTAR, (unsigned long)entry_SYSCALL_64);
|
|
|
|
|
|
|
|
|
|
#ifdef CONFIG_IA32_EMULATION
|
|
|
|
|
wrmsrl(MSR_CSTAR, (unsigned long)entry_SYSCALL_compat);
|
|
|
|
|
--
|
|
|
|
|
2.14.2
|
|
|
|
|
|
