2018-01-15 11:26:15 +00:00
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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2018-01-06 14:13:39 +00:00
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From: Thomas Gleixner <tglx@linutronix.de>
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Date: Mon, 4 Dec 2017 15:07:43 +0100
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2018-01-15 11:26:15 +00:00
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Subject: [PATCH] x86/mm/pti: Force entry through trampoline when PTI active
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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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Force the entry through the trampoline only when PTI is active. Otherwise
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go through the normal entry code.
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Reviewed-by: Borislav Petkov <bp@suse.de>
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Cc: Andy Lutomirski <luto@kernel.org>
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Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
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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: Denys Vlasenko <dvlasenk@redhat.com>
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Cc: Eduardo Valentin <eduval@amazon.com>
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Cc: Greg KH <gregkh@linuxfoundation.org>
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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: Linus Torvalds <torvalds@linux-foundation.org>
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Cc: Peter Zijlstra <peterz@infradead.org>
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Cc: Will Deacon <will.deacon@arm.com>
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Cc: aliguori@amazon.com
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Cc: daniel.gruss@iaik.tugraz.at
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Cc: hughd@google.com
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Cc: keescook@google.com
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Signed-off-by: Ingo Molnar <mingo@kernel.org>
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(cherry picked from commit 8d4b067895791ab9fdb1aadfc505f64d71239dd2)
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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 9ae1ea4821648be179a96fe65b3ed4bd111a5c98)
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Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
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---
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arch/x86/kernel/cpu/common.c | 5 ++++-
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1 file changed, 4 insertions(+), 1 deletion(-)
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diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
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index 623ba3635793..99f37d1636ff 100644
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--- a/arch/x86/kernel/cpu/common.c
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+++ b/arch/x86/kernel/cpu/common.c
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@@ -1340,7 +1340,10 @@ void syscall_init(void)
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(entry_SYSCALL_64_trampoline - _entry_trampoline);
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wrmsr(MSR_STAR, 0, (__USER32_CS << 16) | __KERNEL_CS);
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- wrmsrl(MSR_LSTAR, SYSCALL64_entry_trampoline);
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+ if (static_cpu_has(X86_FEATURE_PTI))
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+ wrmsrl(MSR_LSTAR, SYSCALL64_entry_trampoline);
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+ else
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+ wrmsrl(MSR_LSTAR, (unsigned long)entry_SYSCALL_64);
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#ifdef CONFIG_IA32_EMULATION
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wrmsrl(MSR_CSTAR, (unsigned long)entry_SYSCALL_compat);
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--
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2.14.2
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