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: Mon, 18 Sep 2017 21:43:30 -0500
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2018-01-15 14:26:15 +03:00
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Subject: [PATCH] objtool: Don't report end of section error after an empty
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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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If asm code specifies an UNWIND_HINT_EMPTY hint, don't warn if the
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section ends unexpectedly. This can happen with the xen-head.S code
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because the hypercall_page is "text" but it's all zeros.
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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/ddafe199dd8797e40e3c2777373347eba1d65572.1505764066.git.jpoimboe@redhat.com
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Signed-off-by: Ingo Molnar <mingo@kernel.org>
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(cherry picked from commit 00d96180dc38ef872ac471c2d3e14b067cbd895d)
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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 9d22f903bba24f2ac86de8a81dc1788f9957aca8)
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Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
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---
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tools/objtool/check.c | 7 +++++--
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1 file changed, 5 insertions(+), 2 deletions(-)
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diff --git a/tools/objtool/check.c b/tools/objtool/check.c
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index 368275de5f23..0a86fd0ac082 100644
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--- a/tools/objtool/check.c
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+++ b/tools/objtool/check.c
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@@ -1652,11 +1652,14 @@ static int validate_branch(struct objtool_file *file, struct instruction *first,
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if (insn->dead_end)
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return 0;
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- insn = next_insn;
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- if (!insn) {
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+ if (!next_insn) {
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+ if (state.cfa.base == CFI_UNDEFINED)
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+ return 0;
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WARN("%s: unexpected end of section", sec->name);
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return 1;
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}
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+
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+ insn = next_insn;
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}
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return 0;
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--
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2.14.2
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