[oe-commits] [openembedded-core] 02/12: libpcre2: Fix CVE-2017-7186
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Wed Aug 30 10:21:17 UTC 2017
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commit 1b87201784e733f3a9d436f56cb5a6151ba6bdfa
Author: Robert Yang <liezhi.yang at windriver.com>
AuthorDate: Tue Aug 29 17:48:57 2017 -0700
libpcre2: Fix CVE-2017-7186
A fuzz on libpcre1 through the pcretest utility revealed an invalid read in the
library. For who is interested in a detailed description of the bug, will
follow a feedback from upstream:
This was a genuine bug in the 32-bit library. Thanks for finding it. The crash
was caused by trying to find a Unicode property for a code value greater than
0x10ffff, the Unicode maximum, when running in non-UTF mode (where character
values can be up to 0xffffffff).
Signed-off-by: Robert Yang <liezhi.yang at windriver.com>
Signed-off-by: Richard Purdie <richard.purdie at linuxfoundation.org>
---
.../libpcre/libpcre2/libpcre2-CVE-2017-7186.patch | 96 ++++++++++++++++++++++
meta/recipes-support/libpcre/libpcre2_10.23.bb | 1 +
2 files changed, 97 insertions(+)
diff --git a/meta/recipes-support/libpcre/libpcre2/libpcre2-CVE-2017-7186.patch b/meta/recipes-support/libpcre/libpcre2/libpcre2-CVE-2017-7186.patch
new file mode 100644
index 0000000..bfa3bfe
--- /dev/null
+++ b/meta/recipes-support/libpcre/libpcre2/libpcre2-CVE-2017-7186.patch
@@ -0,0 +1,96 @@
+libpcre2-10.23: Fix CVE-2017-7186
+
+A fuzz on libpcre1 through the pcretest utility revealed an invalid read in the
+library. For who is interested in a detailed description of the bug, will
+follow a feedback from upstream:
+
+This was a genuine bug in the 32-bit library. Thanks for finding it. The crash
+was caused by trying to find a Unicode property for a code value greater than
+0x10ffff, the Unicode maximum, when running in non-UTF mode (where character
+values can be up to 0xffffffff).
+
+The complete ASan output:
+
+# pcretest -32 -d $FILE
+==14788==ERROR: AddressSanitizer: SEGV on unknown address 0x7f1bbffed4df (pc 0x7f1bbee3fe6b bp 0x7fff8b50d8c0 sp 0x7fff8b50d3a0 T0)
+==14788==The signal is caused by a READ memory access.
+ #0 0x7f1bbee3fe6a in match /tmp/portage/dev-libs/libpcre-8.40/work/pcre-8.40/pcre_exec.c:5473:18
+ #1 0x7f1bbee09226 in pcre32_exec /tmp/portage/dev-libs/libpcre-8.40/work/pcre-8.40/pcre_exec.c:6936:8
+ #2 0x527d6c in main /tmp/portage/dev-libs/libpcre-8.40/work/pcre-8.40/pcretest.c:5218:9
+ #3 0x7f1bbddd678f in __libc_start_main /tmp/portage/sys-libs/glibc-2.23-r3/work/glibc-2.23/csu/../csu/libc-start.c:289
+ #4 0x41b438 in _init (/usr/bin/pcretest+0x41b438)
+
+AddressSanitizer can not provide additional info.
+SUMMARY: AddressSanitizer: SEGV /tmp/portage/dev-libs/libpcre-8.40/work/pcre-8.40/pcre_exec.c:5473:18 in match
+==14788==ABORTING
+
+Upstream-Status: Backport [https://vcs.pcre.org/pcre2/code/trunk/src/pcre2_ucd.c?view=patch&r1=316&r2=670&sortby=date \
+ https://vcs.pcre.org/pcre2/code/trunk/src/pcre2_internal.h?view=patch&r1=600&r2=670&sortby=date]
+CVE: CVE-2017-7186
+
+Signed-off-by: Robert Yang <liezhi.yang at windriver.com>
+
+--- trunk/src/pcre2_ucd.c 2015/07/17 15:44:51 316
++++ trunk/src/pcre2_ucd.c 2017/02/24 18:25:32 670
+@@ -41,6 +41,20 @@
+
+ const char *PRIV(unicode_version) = "8.0.0";
+
++/* If the 32-bit library is run in non-32-bit mode, character values
++greater than 0x10ffff may be encountered. For these we set up a
++special record. */
++
++#if PCRE2_CODE_UNIT_WIDTH == 32
++const ucd_record PRIV(dummy_ucd_record)[] = {{
++ ucp_Common, /* script */
++ ucp_Cn, /* type unassigned */
++ ucp_gbOther, /* grapheme break property */
++ 0, /* case set */
++ 0, /* other case */
++ }};
++#endif
++
+ /* When recompiling tables with a new Unicode version, please check the
+ types in this structure definition from pcre2_internal.h (the actual
+ field names will be different):
+--- trunk/src/pcre2_internal.h 2016/11/19 12:46:24 600
++++ trunk/src/pcre2_internal.h 2017/02/24 18:25:32 670
+@@ -1774,10 +1774,17 @@
+ /* UCD access macros */
+
+ #define UCD_BLOCK_SIZE 128
+-#define GET_UCD(ch) (PRIV(ucd_records) + \
++#define REAL_GET_UCD(ch) (PRIV(ucd_records) + \
+ PRIV(ucd_stage2)[PRIV(ucd_stage1)[(int)(ch) / UCD_BLOCK_SIZE] * \
+ UCD_BLOCK_SIZE + (int)(ch) % UCD_BLOCK_SIZE])
+
++#if PCRE2_CODE_UNIT_WIDTH == 32
++#define GET_UCD(ch) ((ch > MAX_UTF_CODE_POINT)? \
++ PRIV(dummy_ucd_record) : REAL_GET_UCD(ch))
++#else
++#define GET_UCD(ch) REAL_GET_UCD(ch)
++#endif
++
+ #define UCD_CHARTYPE(ch) GET_UCD(ch)->chartype
+ #define UCD_SCRIPT(ch) GET_UCD(ch)->script
+ #define UCD_CATEGORY(ch) PRIV(ucp_gentype)[UCD_CHARTYPE(ch)]
+@@ -1834,6 +1841,9 @@
+ #define _pcre2_default_compile_context PCRE2_SUFFIX(_pcre2_default_compile_context_)
+ #define _pcre2_default_match_context PCRE2_SUFFIX(_pcre2_default_match_context_)
+ #define _pcre2_default_tables PCRE2_SUFFIX(_pcre2_default_tables_)
++#if PCRE2_CODE_UNIT_WIDTH == 32
++#define _pcre2_dummy_ucd_record PCRE2_SUFFIX(_pcre2_dummy_ucd_record_)
++#endif
+ #define _pcre2_hspace_list PCRE2_SUFFIX(_pcre2_hspace_list_)
+ #define _pcre2_vspace_list PCRE2_SUFFIX(_pcre2_vspace_list_)
+ #define _pcre2_ucd_caseless_sets PCRE2_SUFFIX(_pcre2_ucd_caseless_sets_)
+@@ -1858,6 +1868,9 @@
+ extern const uint32_t PRIV(vspace_list)[];
+ extern const uint32_t PRIV(ucd_caseless_sets)[];
+ extern const ucd_record PRIV(ucd_records)[];
++#if PCRE2_CODE_UNIT_WIDTH == 32
++extern const ucd_record PRIV(dummy_ucd_record)[];
++#endif
+ extern const uint8_t PRIV(ucd_stage1)[];
+ extern const uint16_t PRIV(ucd_stage2)[];
+ extern const uint32_t PRIV(ucp_gbtable)[];
diff --git a/meta/recipes-support/libpcre/libpcre2_10.23.bb b/meta/recipes-support/libpcre/libpcre2_10.23.bb
index 63f8d51..ca2b028 100644
--- a/meta/recipes-support/libpcre/libpcre2_10.23.bb
+++ b/meta/recipes-support/libpcre/libpcre2_10.23.bb
@@ -13,6 +13,7 @@ LIC_FILES_CHKSUM = "file://LICENCE;md5=3de34df49e1fe3c3b59a08dff214488b"
SRC_URI = "https://ftp.pcre.org/pub/pcre/pcre2-${PV}.tar.bz2 \
file://pcre-cross.patch \
file://libpcre2-CVE-2017-8786.patch \
+ file://libpcre2-CVE-2017-7186.patch \
"
SRC_URI[md5sum] = "b2cd00ca7e24049040099b0a46bb3649"
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