[PATCH 02/20] grep2.19: CVE-2015-1345

Armin Kuster
2016-01-10T00:31:00Z

From: Sona Sarmadi <sona.sarmadi@enea.com>

Fixes heap-based buffer overflow flaw in grep.
Affected versions are: grep 2.19 through 2.21

Removed THANKS.in changes from upstream patch since this
file does not exist in version 2.19.
Replaced tab with spaces in SRC_URI as well.

Upstream fix:
http://git.sv.gnu.org/cgit/grep.git/commit/?id=
83a95bd8c8561875b948cadd417c653dbe7ef2e2

Signed-off-by: Sona Sarmadi <sona.sarmadi@enea.com>
Signed-off-by: Armin Kuster <akuster@mvista.com>
---
.../grep/grep-2.19/grep2.19-CVE-2015-1345.patch | 129 +++++++++++++++++++++
meta/recipes-extended/grep/grep_2.19.bb | 4 +-
2 files changed, 132 insertions(+), 1 deletion(-)
create mode 100644 meta/recipes-extended/grep/grep-2.19/grep2.19-CVE-2015-1345.patch

diff --git a/meta/recipes-extended/grep/grep-2.19/grep2.19-CVE-2015-1345.patch b/meta/recipes-extended/grep/grep-2.19/grep2.19-CVE-2015-1345.patch
new file mode 100644
index 0000000..32846f5
--- /dev/null
+++ b/meta/recipes-extended/grep/grep-2.19/grep2.19-CVE-2015-1345.patch
@@ -0,0 +1,129 @@
+From 83a95bd8c8561875b948cadd417c653dbe7ef2e2 Mon Sep 17 00:00:00 2001
+From: Yuliy Pisetsky <ypisetsky@fb.com>
+Date: Thu, 01 Jan 2015 23:36:55 +0000
+Subject: grep -F: fix a heap buffer (read) overrun
+
+grep's read buffer is often filled to its full size, except when
+reading the final buffer of a file. In that case, the number of
+bytes read may be far less than the size of the buffer. However, for
+certain unusual pattern/text combinations, grep -F would mistakenly
+examine bytes in that uninitialized region of memory when searching
+for a match. With carefully chosen inputs, one can cause grep -F to
+read beyond the end of that buffer altogether. This problem arose via
+commit v2.18-90-g73893ff with the introduction of a more efficient
+heuristic using what is now the memchr_kwset function. The use of
+that function in bmexec_trans could leave TP much larger than EP,
+and the subsequent call to bm_delta2_search would mistakenly access
+beyond end of the main input read buffer.
+
+* src/kwset.c (bmexec_trans): When TP reaches or exceeds EP,
+do not call bm_delta2_search.
+* tests/kwset-abuse: New file.
+* tests/Makefile.am (TESTS): Add it.
+* NEWS (Bug fixes): Mention it.
+
+Prior to this patch, this command would trigger a UMR:
+
+ printf %0360db 0 | valgrind src/grep -F $(printf %019dXb 0)
+
+ Use of uninitialised value of size 8
+ at 0x4142BE: bmexec_trans (kwset.c:657)
+ by 0x4143CA: bmexec (kwset.c:678)
+ by 0x414973: kwsexec (kwset.c:848)
+ by 0x414DC4: Fexecute (kwsearch.c:128)
+ by 0x404E2E: grepbuf (grep.c:1238)
+ by 0x4054BF: grep (grep.c:1417)
+ by 0x405CEB: grepdesc (grep.c:1645)
+ by 0x405EC1: grep_command_line_arg (grep.c:1692)
+ by 0x4077D4: main (grep.c:2570)
+
+See the accompanying test for how to trigger the heap buffer overrun.
+
+Thanks to Nima Aghdaii for testing and finding numerous
+ways to break early iterations of this patch.
+
+Fixes CVE-2015-1345.
+Upstream-Status: Backport
+
+---
+diff --git a/NEWS b/NEWS
+index 975440d..3835d8d 100644
+--- a/NEWS
++++ b/NEWS
+@@ -2,6 +2,11 @@ GNU grep NEWS -*- outline -*-
+
+ * Noteworthy changes in release ?.? (????-??-??) [?]
+
++** Bug fixes
++
++ grep no longer reads from uninitialized memory or from beyond the end
++ of the heap-allocated input buffer.
++
+
+ * Noteworthy changes in release 2.21 (2014-11-23) [stable]
+
+diff --git a/src/kwset.c b/src/kwset.c
+index 4003c8d..376f7c3 100644
+--- a/src/kwset.c
++++ b/src/kwset.c
+@@ -643,6 +643,8 @@ bmexec_trans (kwset_t kwset, char const *text, size_t size)
+ if (! tp)
+ return -1;
+ tp++;
++ if (ep <= tp)
++ break;
+ }
+ }
+ }
+diff --git a/tests/Makefile.am b/tests/Makefile.am
+index 2cba2cd..0508cd2 100644
+--- a/tests/Makefile.am
++++ b/tests/Makefile.am
+@@ -75,6 +75,7 @@ TESTS = \
+ inconsistent-range \
+ invalid-multibyte-infloop \
+ khadafy \
++ kwset-abuse \
+ long-line-vs-2GiB-read \
+ match-lines \
+ max-count-overread \
+diff --git a/tests/kwset-abuse b/tests/kwset-abuse
+new file mode 100755
+index 0000000..6d8ec0c
+--- a/dev/null
++++ b/tests/kwset-abuse
+@@ -0,0 +1,32 @@
++#! /bin/sh
++# Evoke a segfault in a hard-to-reach code path of kwset.c.
++# This bug affected grep versions 2.19 through 2.21.
++#
++# Copyright (C) 2015 Free Software Foundation, Inc.
++#
++# This program is free software: you can redistribute it and/or modify
++# it under the terms of the GNU General Public License as published by
++# the Free Software Foundation, either version 3 of the License, or
++# (at your option) any later version.
++
++# This program is distributed in the hope that it will be useful,
++# but WITHOUT ANY WARRANTY; without even the implied warranty of
++# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
++# GNU General Public License for more details.
++
++# You should have received a copy of the GNU General Public License
++# along with this program. If not, see <http://www.gnu.org/licenses/>.
++
++. "${srcdir=.}/init.sh"; path_prepend_ ../src
++
++fail=0
++
++# This test case chooses a haystack of size 260,000, since prodding
++# with gdb showed a reallocation slightly larger than that in fillbuf.
++# To reach the buggy code, the needle must have length < 1/11 that of
++# the haystack, and 10,000 is a nice round number that fits the bill.
++printf '%0260000dXy\n' 0 | grep -F $(printf %010000dy 0)
++
++test $? = 1 || fail=1
++
++Exit $fail
+--
+cgit v0.9.0.2
diff --git a/meta/recipes-extended/grep/grep_2.19.bb b/meta/recipes-extended/grep/grep_2.19.bb
index 9c162cc..d60ce5e 100644
--- a/meta/recipes-extended/grep/grep_2.19.bb
+++ b/meta/recipes-extended/grep/grep_2.19.bb
@@ -5,7 +5,9 @@ SECTION = "console/utils"
LICENSE = "GPLv3"
LIC_FILES_CHKSUM = "file://COPYING;md5=8006d9c814277c1bfc4ca22af94b59ee"

-SRC_URI = "${GNU_MIRROR}/grep/grep-${PV}.tar.xz"
+SRC_URI = "${GNU_MIRROR}/grep/grep-${PV}.tar.xz \
+ file://grep2.19-CVE-2015-1345.patch \
+ "

SRC_URI[md5sum] = "ac732142227d9fe9567d71301e127979"
SRC_URI[sha256sum] = "6388295be48cfcaf7665d9cd3914e6625ea000e9414132bfefd45cf1d8eec34d"
--
1.9.1