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pcre: add upstream security fixes

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Take Debian adapted patches of upstream.

Fixes:

CVE-2017-6004: crafted regular expression may cause denial of service

CVE-2017-7186: invalid Unicode property lookup may cause denial of service

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Baruch Siach 2017-03-31 14:09:36 +03:00 committed by Peter Korsgaard
parent 26fb7c8758
commit 3143910eec
2 changed files with 81 additions and 0 deletions
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21
package/pcre/0003-CVE-2017-6004.patch Normal file
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@ -0,0 +1,21 @@
Description: CVE-2017-6004: crafted regular expression may cause denial of service
Origin: upstream, https://vcs.pcre.org/pcre/code/trunk/pcre_jit_compile.c?r1=1676&r2=1680&view=patch
Bug: https://bugs.exim.org/show_bug.cgi?id=2035
Bug-Debian: https://bugs.debian.org/855405
Forwarded: not-needed
Author: Salvatore Bonaccorso <carnil@debian.org>
Last-Update: 2017-02-17
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
--- a/pcre_jit_compile.c
+++ b/pcre_jit_compile.c
@@ -8111,7 +8111,7 @@ if (opcode == OP_COND || opcode == OP_SC
if (*matchingpath == OP_FAIL)
stacksize = 0;
- if (*matchingpath == OP_RREF)
+ else if (*matchingpath == OP_RREF)
{
stacksize = GET2(matchingpath, 1);
if (common->currententry == NULL)

60
package/pcre/0004-CVE-2017-7186.patch Normal file
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@ -0,0 +1,60 @@
Description: Upstream fix for CVE-2017-7186 (Upstream rev 1688)
Fix Unicode property crash for 32-bit characters greater than 0x10ffff.
Author: Matthew Vernon <matthew@debian.org>
X-Dgit-Generated: 2:8.39-3 c4c2c7c4f74d53b263af2471d8e11db88096bd13
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
---
--- pcre3-8.39.orig/pcre_internal.h
+++ pcre3-8.39/pcre_internal.h
@@ -2772,6 +2772,9 @@ extern const pcre_uint8 PRIV(ucd_stage1
extern const pcre_uint16 PRIV(ucd_stage2)[];
extern const pcre_uint32 PRIV(ucp_gentype)[];
extern const pcre_uint32 PRIV(ucp_gbtable)[];
+#ifdef COMPILE_PCRE32
+extern const ucd_record PRIV(dummy_ucd_record)[];
+#endif
#ifdef SUPPORT_JIT
extern const int PRIV(ucp_typerange)[];
#endif
@@ -2780,9 +2783,15 @@ extern const int PRIV(ucp_typera
/* 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])
+
+#ifdef COMPILE_PCRE32
+#define GET_UCD(ch) ((ch > 0x10ffff)? 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
--- pcre3-8.39.orig/pcre_ucd.c
+++ pcre3-8.39/pcre_ucd.c
@@ -38,6 +38,20 @@ const pcre_uint16 PRIV(ucd_stage2)[] = {
const pcre_uint32 PRIV(ucd_caseless_sets)[] = {0};
#else
+/* 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. */
+
+#ifdef COMPILE_PCRE32
+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 pcre_internal.h (the actual
field names will be different):