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Fix CVE-2017-8786:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-8786
https://bugs.exim.org/show_bug.cgi?id=2079
https://blogs.gentoo.org/ago/2017/04/29/libpcre-heap-based-buffer-overflow-write-in-pcre2test-c/
Patch copied from upstream source repository:
https://vcs.pcre.org/pcre2?view=revision&revision=696
https://vcs.pcre.org/pcre2?view=revision&revision=697
--- trunk/doc/pcre2api.3 2017/03/21 16:48:40 695
+++ trunk/doc/pcre2api.3 2017/03/21 17:46:21 696
@@ -1,4 +1,4 @@
-.TH PCRE2API 3 "24 December 2016" "PCRE2 10.23"
+.TH PCRE2API 3 "21 March 2017" "PCRE2 10.30"
.SH NAME
PCRE2 - Perl-compatible regular expressions (revised API)
.sp
@@ -2633,8 +2633,8 @@
A text message for an error code from any PCRE2 function (compile, match, or
auxiliary) can be obtained by calling \fBpcre2_get_error_message()\fP. The code
is passed as the first argument, with the remaining two arguments specifying a
-code unit buffer and its length, into which the text message is placed. Note
-that the message is returned in code units of the appropriate width for the
+code unit buffer and its length in code units, into which the text message is
+placed. The message is returned in code units of the appropriate width for the
library that is being used.
.P
The returned message is terminated with a trailing zero, and the function
@@ -3321,6 +3321,6 @@
.rs
.sp
.nf
-Last updated: 23 December 2016
-Copyright (c) 1997-2016 University of Cambridge.
+Last updated: 21 March 2017
+Copyright (c) 1997-2017 University of Cambridge.
.fi
--- trunk/src/pcre2_error.c 2017/03/21 16:48:40 695
+++ trunk/src/pcre2_error.c 2017/03/21 17:46:21 696
@@ -271,7 +271,7 @@
Arguments:
enumber error number
buffer where to put the message (zero terminated)
- size size of the buffer
+ size size of the buffer in code units
Returns: length of message if all is well
negative on error
--- trunk/src/pcre2test.c 2017/03/21 17:46:21 696
+++ trunk/src/pcre2test.c 2017/03/21 18:36:13 697
@@ -1017,9 +1017,9 @@
if (test_mode == PCRE8_MODE) \
r = pcre2_get_error_message_8(a,G(b,8),G(G(b,8),_size)); \
else if (test_mode == PCRE16_MODE) \
- r = pcre2_get_error_message_16(a,G(b,16),G(G(b,16),_size)); \
+ r = pcre2_get_error_message_16(a,G(b,16),G(G(b,16),_size/2)); \
else \
- r = pcre2_get_error_message_32(a,G(b,32),G(G(b,32),_size))
+ r = pcre2_get_error_message_32(a,G(b,32),G(G(b,32),_size/4))
#define PCRE2_GET_OVECTOR_COUNT(a,b) \
if (test_mode == PCRE8_MODE) \
@@ -1399,6 +1399,9 @@
/* ----- Common macros for two-mode cases ----- */
+#define BYTEONE (BITONE/8)
+#define BYTETWO (BITTWO/8)
+
#define CASTFLD(t,a,b) \
((test_mode == G(G(PCRE,BITONE),_MODE))? (t)(G(a,BITONE)->b) : \
(t)(G(a,BITTWO)->b))
@@ -1481,9 +1484,9 @@
#define PCRE2_GET_ERROR_MESSAGE(r,a,b) \
if (test_mode == G(G(PCRE,BITONE),_MODE)) \
- r = G(pcre2_get_error_message_,BITONE)(a,G(b,BITONE),G(G(b,BITONE),_size)); \
+ r = G(pcre2_get_error_message_,BITONE)(a,G(b,BITONE),G(G(b,BITONE),_size/BYTEONE)); \
else \
- r = G(pcre2_get_error_message_,BITTWO)(a,G(b,BITTWO),G(G(b,BITTWO),_size))
+ r = G(pcre2_get_error_message_,BITTWO)(a,G(b,BITTWO),G(G(b,BITTWO),_size/BYTETWO))
#define PCRE2_GET_OVECTOR_COUNT(a,b) \
if (test_mode == G(G(PCRE,BITONE),_MODE)) \
@@ -1904,7 +1907,7 @@
#define PCRE2_DFA_MATCH(a,b,c,d,e,f,g,h,i,j) \
a = pcre2_dfa_match_16(G(b,16),(PCRE2_SPTR16)c,d,e,f,G(g,16),h,i,j)
#define PCRE2_GET_ERROR_MESSAGE(r,a,b) \
- r = pcre2_get_error_message_16(a,G(b,16),G(G(b,16),_size))
+ r = pcre2_get_error_message_16(a,G(b,16),G(G(b,16),_size/2))
#define PCRE2_GET_OVECTOR_COUNT(a,b) a = pcre2_get_ovector_count_16(G(b,16))
#define PCRE2_GET_STARTCHAR(a,b) a = pcre2_get_startchar_16(G(b,16))
#define PCRE2_JIT_COMPILE(r,a,b) r = pcre2_jit_compile_16(G(a,16),b)
@@ -2000,7 +2003,7 @@
#define PCRE2_DFA_MATCH(a,b,c,d,e,f,g,h,i,j) \
a = pcre2_dfa_match_32(G(b,32),(PCRE2_SPTR32)c,d,e,f,G(g,32),h,i,j)
#define PCRE2_GET_ERROR_MESSAGE(r,a,b) \
- r = pcre2_get_error_message_32(a,G(b,32),G(G(b,32),_size))
+ r = pcre2_get_error_message_32(a,G(b,32),G(G(b,32),_size/4))
#define PCRE2_GET_OVECTOR_COUNT(a,b) a = pcre2_get_ovector_count_32(G(b,32))
#define PCRE2_GET_STARTCHAR(a,b) a = pcre2_get_startchar_32(G(b,32))
#define PCRE2_JIT_COMPILE(r,a,b) r = pcre2_jit_compile_32(G(a,32),b)
--- trunk/src/pcre2test.c 2017/03/21 16:48:40 695
+++ trunk/src/pcre2test.c 2017/03/21 17:46:21 696
@@ -2889,7 +2889,7 @@
{
if (pbuffer32 != NULL) free(pbuffer32);
pbuffer32_size = 4*len + 4;
- if (pbuffer32_size < 256) pbuffer32_size = 256;
+ if (pbuffer32_size < 512) pbuffer32_size = 512;
pbuffer32 = (uint32_t *)malloc(pbuffer32_size);
if (pbuffer32 == NULL)
{
@@ -7600,7 +7600,8 @@
int errcode;
char *endptr;
-/* Ensure the relevant non-8-bit buffer is available. */
+/* Ensure the relevant non-8-bit buffer is available. Ensure that it is at
+least 128 code units, because it is used for retrieving error messages. */
#ifdef SUPPORT_PCRE2_16
if (test_mode == PCRE16_MODE)
@@ -7620,7 +7621,7 @@
#ifdef SUPPORT_PCRE2_32
if (test_mode == PCRE32_MODE)
{
- pbuffer32_size = 256;
+ pbuffer32_size = 512;
pbuffer32 = (uint32_t *)malloc(pbuffer32_size);
if (pbuffer32 == NULL)
{
--- trunk/testdata/testinput2 2017/03/21 16:48:40 695
+++ trunk/testdata/testinput2 2017/03/21 17:46:21 696
@@ -5017,4 +5017,6 @@
/(?<!\1((?U)1((?U))))(*F)/never_backslash_c,alt_bsux,anchored,extended
+/\g{3/
+
# End of testinput2
--- trunk/testdata/testoutput2 2017/03/21 16:48:40 695
+++ trunk/testdata/testoutput2 2017/03/21 17:46:21 696
@@ -15570,6 +15570,9 @@
/(?<!\1((?U)1((?U))))(*F)/never_backslash_c,alt_bsux,anchored,extended
+/\g{3/
+Failed: error 157 at offset 2: \g is not followed by a braced, angle-bracketed, or quoted name/number or by a plain number
+
# End of testinput2
Error -63: PCRE2_ERROR_BADDATA (unknown error number)
Error -62: bad serialized data
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