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Add fix for off by one adding DW_FORM_string replacement (#1434347)

This commit is contained in:
Mark Wielaard 2017-03-21 17:04:02 +01:00
parent 915296ceec
commit bc4decbc5f
2 changed files with 56 additions and 1 deletions
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51
0021-debugedit-Fix-off-by-one-adding-DW_FORM_string-repla.patch Normal file
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@ -0,0 +1,51 @@
From e6cbf971242e424264711f9ffad57eee7f6d6f67 Mon Sep 17 00:00:00 2001
From: Mark Wielaard <mark@klomp.org>
Date: Tue, 21 Mar 2017 16:46:37 +0100
Subject: [PATCH] debugedit: Fix off-by-one adding DW_FORM_string replacement
slashes.
We would put one too many slashes in between the new dest_dir and file name
part of the replacement of a DW_FORM_string in the .debug_info. If there
was file part then we would overwrite the first character of the name. If
there was no file part at all then this would overwrite the zero terminator
and cause a crash reading the rest of the data.
A crash did happen while building the docker package on fedora s390x.
https://bugzilla.redhat.com/show_bug.cgi?id=1434347
The reason neither issue would normally trigger is because if we do detect
that the dest_dir is larger than the base_dir we refuse to replace anything.
Signed-off-by: Mark Wielaard <mark@klomp.org>
---
tools/debugedit.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/tools/debugedit.c b/tools/debugedit.c
index 0f37316..b618dce 100644
--- a/tools/debugedit.c
+++ b/tools/debugedit.c
@@ -1507,12 +1507,16 @@ edit_attributes (DSO *dso, unsigned char *ptr, struct abbrev_tag *t, int phase)
comp_dir, base_dir, dest_dir);
else
{
- /* Add one or more slashes in between to
- fill up all space (replacement must be
- of the same length). */
+ /* Add zero (if no file part), one or more
+ slashes in between the new dest_dir and the
+ file name to fill up all space (replacement
+ DW_FORM_string must be of the same length).
+ We don't need to copy the old file name (if
+ any) or the zero terminator, because those
+ are already at the end of the string. */
memcpy (ptr, dest_dir, dest_len);
memset (ptr + dest_len, '/',
- orig_len - new_len + 1);
+ orig_len - new_len);
}
}
}
--
1.8.3.1

6
rpm.spec
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@ -29,7 +29,7 @@
Summary: The RPM package management system
Name: rpm
Version: %{rpmver}
Release: %{?snapver:0.%{snapver}.}13%{?dist}
Release: %{?snapver:0.%{snapver}.}14%{?dist}
Group: System Environment/Base
Url: http://www.rpm.org/
Source0: http://rpm.org/releases/%{srcdir}/%{name}-%{srcver}.tar.bz2
@ -92,6 +92,7 @@ Patch266: 0017-do-not-process-buildi-ds-for-noarch.patch
Patch267: 0018-update-build-id-endian.patch
Patch268: 0019-fix-sed-build-id-match-test.patch
Patch269: 0020-build-files-exec-build-id.patch
Patch270: 0021-debugedit-Fix-off-by-one-adding-DW_FORM_string-repla.patch
# OpenSSL backend
Patch300: 0001-Add-OpenSSL-support-for-digest-and-signatures.patch
@ -596,6 +597,9 @@ exit 0
%doc doc/librpm/html/*
%changelog
* Tue Mar 21 2017 Mark Wielaard <mjw@redhat.com> - 4.13.0.1-14
- Add fix for off by one adding DW_FORM_string replacement (#1434347).
* Mon Mar 20 2017 Mark Wielaard <mjw@redhat.com> - 4.13.0.1-13
- Add tests fix for sed file build-id regexp matching.
- Add fix for build-ids in non-executable ELF files (#1433837).