cataphract Mon, 21 Feb 2011 06:53:24 +0000
Revision: http://svn.php.net/viewvc?view=revision&revision=308525
Log:
- Fixed bug #54055 (buffer overrun with high values for precision ini
setting).
#This fix (for g/G/k/H modes) is done at a different level than that for the
#modes e/E/f/F, at a bit higher level and therefore with less coverage. I
#chose this because it addresses the problem where it is -- the calling function
#that passes a buffer too small to php_gcvt.
Bug: http://bugs.php.net/54055 (Open) PHP crashes when executing strval when
`precision' setting is very hig
Changed paths:
U php/php-src/branches/PHP_5_3/NEWS
A php/php-src/branches/PHP_5_3/ext/standard/tests/strings/bug54055.phpt
U php/php-src/branches/PHP_5_3/main/snprintf.c
U php/php-src/branches/PHP_5_3/main/snprintf.h
U php/php-src/branches/PHP_5_3/main/spprintf.c
A php/php-src/trunk/ext/standard/tests/strings/bug54055.phpt
U php/php-src/trunk/main/snprintf.c
U php/php-src/trunk/main/snprintf.h
U php/php-src/trunk/main/spprintf.c
Modified: php/php-src/branches/PHP_5_3/NEWS
===================================================================
--- php/php-src/branches/PHP_5_3/NEWS 2011-02-21 06:22:00 UTC (rev 308524)
+++ php/php-src/branches/PHP_5_3/NEWS 2011-02-21 06:53:24 UTC (rev 308525)
@@ -34,6 +34,8 @@
authentication using stream_context/http/header/Proxy-Authorization (Dmitry)
. Changed default value of ini directive serialize_precision from 100 to 17.
(Gustavo)
+ . Fixed bug #54055 (buffer overrun with high values for precision ini
+ setting). (Gustavo)
. Fixed bug #53959 (reflection data for fgetcsv out-of-date). (Richard)
. Fixed bug #53577 (Regression introduced in 5.3.4 in open_basedir with a
trailing forward slash). (lekensteyn at gmail dot com, Pierre)
Added: php/php-src/branches/PHP_5_3/ext/standard/tests/strings/bug54055.phpt
===================================================================
--- php/php-src/branches/PHP_5_3/ext/standard/tests/strings/bug54055.phpt (rev 0)
+++ php/php-src/branches/PHP_5_3/ext/standard/tests/strings/bug54055.phpt 2011-02-21 06:53:24 UTC (rev 308525)
@@ -0,0 +1,589 @@
+--TEST--
+Bug #54055: PHP crashes when executing strval when precision setting is very high
+--FILE--
+<?php
+for($i = 495; $i <= 1074; $i++) {
+ ini_set('precision', $i);
+ echo "$i: len=", strlen(strval(-1 * pow(2, -1074))), "\n";
+}
+--EXPECT--
+495: len=502
+496: len=503
+497: len=504
+498: len=505
+499: len=506
+500: len=507
+501: len=507
+502: len=507
+503: len=507
+504: len=507
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Modified: php/php-src/branches/PHP_5_3/main/snprintf.c
===================================================================
--- php/php-src/branches/PHP_5_3/main/snprintf.c 2011-02-21 06:22:00 UTC (rev 308524)
+++ php/php-src/branches/PHP_5_3/main/snprintf.c 2011-02-21 06:53:24 UTC (rev 308525)
@@ -677,10 +677,6 @@
/*
* Check if a precision was specified
- *
- * XXX: an unreasonable amount of precision may be specified
- * resulting in overflow of num_buf. Currently we
- * ignore this possibility.
*/
if (*fmt == '.') {
adjust_precision = YES;
@@ -694,6 +690,10 @@
precision = 0;
} else
precision = 0;
+
+ if (precision > FORMAT_CONV_MAX_PRECISION) {
+ precision = FORMAT_CONV_MAX_PRECISION;
+ }
} else
adjust_precision = NO;
} else
Modified: php/php-src/branches/PHP_5_3/main/snprintf.h
===================================================================
--- php/php-src/branches/PHP_5_3/main/snprintf.h 2011-02-21 06:22:00 UTC (rev 308524)
+++ php/php-src/branches/PHP_5_3/main/snprintf.h 2011-02-21 06:53:24 UTC (rev 308525)
@@ -12,7 +12,7 @@
| obtain it through the world-wide-web, please send a note to |
| lice...@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
- | Author: Stig Sæther Bakken <s...@php.net> |
+ | Author: Stig Sæther Bakken <s...@php.net> |
| Marcus Boerger <he...@php.net> |
+----------------------------------------------------------------------+
*/
@@ -158,6 +158,17 @@
extern char * ap_php_conv_p2(register u_wide_int num, register int nbits,
char format, char *buf_end, register int *len);
+/* The maximum precision that's allowed for float conversion. Does not include
+ * decimal separator, exponent, sign, terminator. Currently does not affect
+ * the modes e/f, only g/k/H, as those have a different limit enforced at
+ * another level (see NDIG in php_conv_fp()).
+ * Applies to the formatting functions of both spprintf.c and snprintf.c, which
+ * use equally sized buffers of MAX_BUF_SIZE = 512 to hold the result of the
+ * call to php_gcvt().
+ * This should be reasonably smaller than MAX_BUF_SIZE (I think MAX_BUF_SIZE - 9
+ * should be enough, but let's give some more space) */
+#define FORMAT_CONV_MAX_PRECISION 500
+
#endif /* SNPRINTF_H */
/*
Modified: php/php-src/branches/PHP_5_3/main/spprintf.c
===================================================================
--- php/php-src/branches/PHP_5_3/main/spprintf.c 2011-02-21 06:22:00 UTC (rev 308524)
+++ php/php-src/branches/PHP_5_3/main/spprintf.c 2011-02-21 06:53:24 UTC (rev 308525)
@@ -285,10 +285,6 @@
/*
* Check if a precision was specified
- *
- * XXX: an unreasonable amount of precision may be specified
- * resulting in overflow of num_buf. Currently we
- * ignore this possibility.
*/
if (*fmt == '.') {
adjust_precision = YES;
@@ -302,6 +298,10 @@
precision = 0;
} else
precision = 0;
+
+ if (precision > FORMAT_CONV_MAX_PRECISION) {
+ precision = FORMAT_CONV_MAX_PRECISION;
+ }
} else
adjust_precision = NO;
} else
Added: php/php-src/trunk/ext/standard/tests/strings/bug54055.phpt
===================================================================
--- php/php-src/trunk/ext/standard/tests/strings/bug54055.phpt (rev 0)
+++ php/php-src/trunk/ext/standard/tests/strings/bug54055.phpt 2011-02-21 06:53:24 UTC (rev 308525)
@@ -0,0 +1,589 @@
+--TEST--
+Bug #54055: PHP crashes when executing strval when precision setting is very high
+--FILE--
+<?php
+for($i = 495; $i <= 1074; $i++) {
+ ini_set('precision', $i);
+ echo "$i: len=", strlen(strval(-1 * pow(2, -1074))), "\n";
+}
+--EXPECT--
+495: len=502
+496: len=503
+497: len=504
+498: len=505
+499: len=506
+500: len=507
+501: len=507
+502: len=507
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Modified: php/php-src/trunk/main/snprintf.c
===================================================================
--- php/php-src/trunk/main/snprintf.c 2011-02-21 06:22:00 UTC (rev 308524)
+++ php/php-src/trunk/main/snprintf.c 2011-02-21 06:53:24 UTC (rev 308525)
@@ -677,10 +677,6 @@
/*
* Check if a precision was specified
- *
- * XXX: an unreasonable amount of precision may be specified
- * resulting in overflow of num_buf. Currently we
- * ignore this possibility.
*/
if (*fmt == '.') {
adjust_precision = YES;
@@ -694,6 +690,10 @@
precision = 0;
} else
precision = 0;
+
+ if (precision > FORMAT_CONV_MAX_PRECISION) {
+ precision = FORMAT_CONV_MAX_PRECISION;
+ }
} else
adjust_precision = NO;
} else
Modified: php/php-src/trunk/main/snprintf.h
===================================================================
--- php/php-src/trunk/main/snprintf.h 2011-02-21 06:22:00 UTC (rev 308524)
+++ php/php-src/trunk/main/snprintf.h 2011-02-21 06:53:24 UTC (rev 308525)
@@ -12,7 +12,7 @@
| obtain it through the world-wide-web, please send a note to |
| lice...@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
- | Author: Stig Sæther Bakken <s...@php.net> |
+ | Author: Stig Sæther Bakken <s...@php.net> |
| Marcus Boerger <he...@php.net> |
+----------------------------------------------------------------------+
*/
@@ -158,6 +158,17 @@
extern char * ap_php_conv_p2(register u_wide_int num, register int nbits,
char format, char *buf_end, register int *len);
+/* The maximum precision that's allowed for float conversion. Does not include
+ * decimal separator, exponent, sign, terminator. Currently does not affect
+ * the modes e/f, only g/k/H, as those have a different limit enforced at
+ * another level (see NDIG in php_conv_fp()).
+ * Applies to the formatting functions of both spprintf.c and snprintf.c, which
+ * use equally sized buffers of MAX_BUF_SIZE = 512 to hold the result of the
+ * call to php_gcvt().
+ * This should be reasonably smaller than MAX_BUF_SIZE (I think MAX_BUF_SIZE - 9
+ * should be enough, but let's give some more space) */
+#define FORMAT_CONV_MAX_PRECISION 500
+
#endif /* SNPRINTF_H */
/*
Modified: php/php-src/trunk/main/spprintf.c
===================================================================
--- php/php-src/trunk/main/spprintf.c 2011-02-21 06:22:00 UTC (rev 308524)
+++ php/php-src/trunk/main/spprintf.c 2011-02-21 06:53:24 UTC (rev 308525)
@@ -285,10 +285,6 @@
/*
* Check if a precision was specified
- *
- * XXX: an unreasonable amount of precision may be specified
- * resulting in overflow of num_buf. Currently we
- * ignore this possibility.
*/
if (*fmt == '.') {
adjust_precision = YES;
@@ -302,6 +298,10 @@
precision = 0;
} else
precision = 0;
+
+ if (precision > FORMAT_CONV_MAX_PRECISION) {
+ precision = FORMAT_CONV_MAX_PRECISION;
+ }
} else
adjust_precision = NO;
} else
--
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