71 lines
2.1 KiB
Diff
71 lines
2.1 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Josh Poimboeuf <jpoimboe@redhat.com>
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Date: Mon, 18 Sep 2017 21:43:36 -0500
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Subject: [PATCH] x86/xen: Add unwind hint annotations
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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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Add unwind hint annotations to the xen head code so the ORC unwinder can
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read head_64.o.
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hypercall_page needs empty annotations at 32-byte intervals to match the
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'xen_hypercall_*' ELF functions at those locations.
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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: Boris Ostrovsky <boris.ostrovsky@oracle.com>
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Cc: Jiri Slaby <jslaby@suse.cz>
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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: Thomas Gleixner <tglx@linutronix.de>
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Link: http://lkml.kernel.org/r/70ed2eb516fe9266be766d953f93c2571bca88cc.1505764066.git.jpoimboe@redhat.com
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Signed-off-by: Ingo Molnar <mingo@kernel.org>
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(cherry picked from commit abbe1cac6214d81d2f4e149aba64a8760703144e)
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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 9f099a90cb39eaff9b3187e8a6d8151c8af53db1)
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Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
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---
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arch/x86/xen/xen-head.S | 7 ++++++-
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1 file changed, 6 insertions(+), 1 deletion(-)
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diff --git a/arch/x86/xen/xen-head.S b/arch/x86/xen/xen-head.S
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index 2f0cff2cc265..ad189ab2c329 100644
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--- a/arch/x86/xen/xen-head.S
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+++ b/arch/x86/xen/xen-head.S
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@@ -9,6 +9,7 @@
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#include <asm/boot.h>
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#include <asm/asm.h>
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#include <asm/page_types.h>
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+#include <asm/unwind_hints.h>
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#include <xen/interface/elfnote.h>
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#include <xen/interface/features.h>
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@@ -19,6 +20,7 @@
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#ifdef CONFIG_XEN_PV
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__INIT
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ENTRY(startup_xen)
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+ UNWIND_HINT_EMPTY
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cld
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/* Clear .bss */
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@@ -40,7 +42,10 @@ END(startup_xen)
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.pushsection .text
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.balign PAGE_SIZE
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ENTRY(hypercall_page)
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- .skip PAGE_SIZE
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+ .rept (PAGE_SIZE / 32)
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+ UNWIND_HINT_EMPTY
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+ .skip 32
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+ .endr
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#define HYPERCALL(n) \
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.equ xen_hypercall_##n, hypercall_page + __HYPERVISOR_##n * 32; \
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--
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2.14.2
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