2018-01-15 14:26:15 +03:00
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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2018-01-06 17:13:39 +03:00
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From: Josh Poimboeuf <jpoimboe@redhat.com>
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Date: Fri, 20 Oct 2017 11:21:33 -0500
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2018-01-15 14:26:15 +03:00
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Subject: [PATCH] x86/entry: Fix idtentry unwind hint
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2018-01-06 17:13:39 +03:00
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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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This fixes the following ORC warning in the 'int3' entry code:
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WARNING: can't dereference iret registers at ffff8801c5f17fe0 for ip ffffffff95f0d94b
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The ORC metadata had the wrong stack offset for the iret registers.
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Their location on the stack is dependent on whether the exception has an
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error code.
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Reported-and-tested-by: Andrei Vagin <avagin@virtuozzo.com>
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Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
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Cc: Andy Lutomirski <luto@kernel.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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Cc: Thomas Gleixner <tglx@linutronix.de>
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Fixes: 8c1f75587a18 ("x86/entry/64: Add unwind hint annotations")
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Link: http://lkml.kernel.org/r/931d57f0551ed7979d5e7e05370d445c8e5137f8.1508516398.git.jpoimboe@redhat.com
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Signed-off-by: Ingo Molnar <mingo@kernel.org>
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(cherry picked from commit 98990a33b77dda9babf91cb235654f6729e5702e)
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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 266be2a5053230f6d0b6f27d3e8e9f28df40dd7e)
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Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
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---
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arch/x86/entry/entry_64.S | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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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 c12260ef3e4b..2e4fc6425f47 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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@@ -821,7 +821,7 @@ apicinterrupt IRQ_WORK_VECTOR irq_work_interrupt smp_irq_work_interrupt
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.macro idtentry sym do_sym has_error_code:req paranoid=0 shift_ist=-1
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ENTRY(\sym)
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- UNWIND_HINT_IRET_REGS offset=8
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+ UNWIND_HINT_IRET_REGS offset=\has_error_code*8
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/* Sanity check */
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.if \shift_ist != -1 && \paranoid == 0
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--
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2.14.2
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