2018-01-06 14:13:39 +00:00
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From 47b64e9de8bba4e6ccd0976bce6cf99446daf82e Mon Sep 17 00:00:00 2001
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From: Juergen Gross <jgross@suse.com>
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Date: Thu, 2 Nov 2017 00:59:07 -0700
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2018-01-07 12:17:59 +00:00
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Subject: [PATCH 095/233] xen, x86/entry/64: Add xen NMI trap entry
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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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Instead of trying to execute any NMI via the bare metal's NMI trap
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handler use a Xen specific one for PV domains, like we do for e.g.
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debug traps. As in a PV domain the NMI is handled via the normal
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kernel stack this is the correct thing to do.
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This will enable us to get rid of the very fragile and questionable
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dependencies between the bare metal NMI handler and Xen assumptions
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believed to be broken anyway.
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Signed-off-by: Juergen Gross <jgross@suse.com>
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Signed-off-by: Andy Lutomirski <luto@kernel.org>
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Cc: Borislav Petkov <bpetkov@suse.de>
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Cc: Brian Gerst <brgerst@gmail.com>
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Cc: Dave Hansen <dave.hansen@intel.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: Thomas Gleixner <tglx@linutronix.de>
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Link: http://lkml.kernel.org/r/5baf5c0528d58402441550c5770b98e7961e7680.1509609304.git.luto@kernel.org
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Signed-off-by: Ingo Molnar <mingo@kernel.org>
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(cherry picked from commit 43e4111086a70c78bedb6ad990bee97f17b27a6e)
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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 20c970e03b42141abf6c45938ce6d4fdc3555921)
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Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
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---
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arch/x86/include/asm/traps.h | 2 +-
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arch/x86/xen/enlighten_pv.c | 2 +-
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arch/x86/entry/entry_64.S | 2 +-
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arch/x86/xen/xen-asm_64.S | 2 +-
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4 files changed, 4 insertions(+), 4 deletions(-)
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diff --git a/arch/x86/include/asm/traps.h b/arch/x86/include/asm/traps.h
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index 8e5bf86f87e5..b052a7621ca1 100644
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--- a/arch/x86/include/asm/traps.h
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+++ b/arch/x86/include/asm/traps.h
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@@ -55,9 +55,9 @@ asmlinkage void simd_coprocessor_error(void);
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#if defined(CONFIG_X86_64) && defined(CONFIG_XEN_PV)
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asmlinkage void xen_divide_error(void);
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+asmlinkage void xen_xennmi(void);
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asmlinkage void xen_xendebug(void);
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asmlinkage void xen_xenint3(void);
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-asmlinkage void xen_nmi(void);
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asmlinkage void xen_overflow(void);
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asmlinkage void xen_bounds(void);
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asmlinkage void xen_invalid_op(void);
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diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
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index 69b9deff7e5c..8da4eff19c2a 100644
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--- a/arch/x86/xen/enlighten_pv.c
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+++ b/arch/x86/xen/enlighten_pv.c
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@@ -600,7 +600,7 @@ static struct trap_array_entry trap_array[] = {
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#ifdef CONFIG_X86_MCE
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{ machine_check, xen_machine_check, true },
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#endif
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- { nmi, xen_nmi, true },
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+ { nmi, xen_xennmi, true },
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{ overflow, xen_overflow, false },
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#ifdef CONFIG_IA32_EMULATION
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{ entry_INT80_compat, xen_entry_INT80_compat, false },
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diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
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index 4eff3aca54ed..5a6aba7cf3bd 100644
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--- a/arch/x86/entry/entry_64.S
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+++ b/arch/x86/entry/entry_64.S
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@@ -1091,6 +1091,7 @@ idtentry int3 do_int3 has_error_code=0 paranoid=1 shift_ist=DEBUG_STACK
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idtentry stack_segment do_stack_segment has_error_code=1
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#ifdef CONFIG_XEN
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+idtentry xennmi do_nmi has_error_code=0
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idtentry xendebug do_debug has_error_code=0
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idtentry xenint3 do_int3 has_error_code=0
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#endif
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@@ -1253,7 +1254,6 @@ ENTRY(error_exit)
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END(error_exit)
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/* Runs on exception stack */
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-/* XXX: broken on Xen PV */
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ENTRY(nmi)
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UNWIND_HINT_IRET_REGS
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/*
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diff --git a/arch/x86/xen/xen-asm_64.S b/arch/x86/xen/xen-asm_64.S
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index dae2cc33afb5..286ecc198562 100644
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--- a/arch/x86/xen/xen-asm_64.S
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+++ b/arch/x86/xen/xen-asm_64.S
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@@ -29,7 +29,7 @@ xen_pv_trap debug
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xen_pv_trap xendebug
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xen_pv_trap int3
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xen_pv_trap xenint3
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-xen_pv_trap nmi
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+xen_pv_trap xennmi
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xen_pv_trap overflow
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xen_pv_trap bounds
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xen_pv_trap invalid_op
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--
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2.14.2
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