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Remove memory exhaustion checks in php_chunk_split()

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George Peter Banyard 2019-08-24 01:52:17 +02:00
parent 6d578482a9
commit 5b09e6043c
5 changed files with 79 additions and 31 deletions
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19
ext/standard/string.c
View file

@ -2105,7 +2105,6 @@ static zend_string *php_chunk_split(const char *src, size_t srclen, const char *
const char *p;
size_t chunks;
size_t restlen;
size_t out_len;
zend_string *dest;
chunks = srclen / chunklen;
@ -2116,17 +2115,7 @@ static zend_string *php_chunk_split(const char *src, size_t srclen, const char *
chunks++;
}
out_len = chunks;
if (endlen !=0 && out_len > INT_MAX/endlen) {
return NULL;
}
out_len *= endlen;
if (out_len > INT_MAX - srclen) {
return NULL;
}
out_len += srclen;
dest = zend_string_alloc(out_len * sizeof(char), 0);
dest = zend_string_safe_alloc(chunks, endlen, srclen, 0);
for (p = src, q = ZSTR_VAL(dest); p < (src + srclen - chunklen + 1); ) {
memcpy(q, p, chunklen);
@ -2150,7 +2139,7 @@ static zend_string *php_chunk_split(const char *src, size_t srclen, const char *
}
/* }}} */
/* {{{ proto string|false chunk_split(string str [, int chunklen [, string ending]])
/* {{{ proto string chunk_split(string str [, int chunklen [, string ending]])
Returns split line */
PHP_FUNCTION(chunk_split)
{
@ -2187,11 +2176,7 @@ PHP_FUNCTION(chunk_split)
result = php_chunk_split(ZSTR_VAL(str), ZSTR_LEN(str), end, endlen, (size_t)chunklen);
if (result) {
RETURN_STR(result);
} else {
RETURN_FALSE;
}
}
/* }}} */

13
ext/standard/tests/strings/chunk_split.phpt
View file

@ -7,17 +7,6 @@ echo chunk_split('foooooooooooooooo', 5)."\n";
echo chunk_split(str_repeat('X', 2*76))."\n";
echo chunk_split("test", 10, "|end") . "\n";
$a=str_repeat("B", 65535);
$b=1;
$c=str_repeat("B", 65535);
var_dump(chunk_split($a,$b,$c));
$a=str_repeat("B", 65537);
$b=1;
$c=str_repeat("B", 65537);
var_dump(chunk_split($a,$b,$c));
?>
--EXPECT--
a-b-c-
@ -30,5 +19,3 @@ XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
test|end
bool(false)
bool(false)

25
ext/standard/tests/strings/chunk_split_variation1_32bit.phpt Normal file
View file

@ -0,0 +1,25 @@
--TEST--
Test chunk_split() function : usage variations - unexpected large '$end' string argument variation 1
--SKIPIF--
<?php
if (PHP_INT_SIZE != 4) die("skip this test is for 32bit platform only");
?>
--FILE--
<?php
/* Prototype : string chunk_split(string $str [, int $chunklen [, string $ending]])
* Description: Returns split line
* Source code: ext/standard/string.c
* Alias to functions: none
*/
echo "*** Testing chunk_split() : unexpected large 'end' string argument variation 1 ***\n";
$a=str_repeat("B", 65535);
$b=1;
$c=str_repeat("B", 65535);
var_dump(chunk_split($a,$b,$c));
?>
--EXPECTF--
*** Testing chunk_split() : unexpected large 'end' string argument variation 1 ***
Fatal error: Allowed memory size of %d bytes exhausted at %s (tried to allocate %d bytes) in %s on line %d

25
ext/standard/tests/strings/chunk_split_variation2_32bit.phpt Normal file
View file

@ -0,0 +1,25 @@
--TEST--
Test chunk_split() function : usage variations - unexpected large '$end' string argument variation 2
--SKIPIF--
<?php
if (PHP_INT_SIZE != 4) die("skip this test is for 32bit platform only");
?>
--FILE--
<?php
/* Prototype : string chunk_split(string $str [, int $chunklen [, string $ending]])
* Description: Returns split line
* Source code: ext/standard/string.c
* Alias to functions: none
*/
echo "*** Testing chunk_split() : unexpected large 'end' string argument variation 2 ***\n";
$a=str_repeat("B", 65537);
$b=1;
$c=str_repeat("B", 65537);
var_dump(chunk_split($a,$b,$c));
?>
--EXPECTF--
*** Testing chunk_split() : unexpected large 'end' string argument variation 2 ***
Fatal error: Possible integer overflow in memory allocation (65537 * 65537 + 65556) in %s on line %d

26
ext/standard/tests/strings/chunk_split_variation3.phpt Normal file
View file

@ -0,0 +1,26 @@
--TEST--
Test chunk_split() function : usage variations - unexpected large number of chunks
--FILE--
<?php
/* Prototype : string chunk_split(string $str [, int $chunklen [, string $ending]])
* Description: Returns split line
* Source code: ext/standard/string.c
* Alias to functions: none
*/
$chunk_length = 1;
echo "*** Testing chunk_split() : unexpected large 'end' string argument variation 2 ***\n";
echo "Body generation\n";
$body = str_repeat("Hello", 10000000);
echo "Using chunk_split()\n";
var_dump(chunk_split($body, $chunk_length));
?>
--EXPECTF--
*** Testing chunk_split() : unexpected large 'end' string argument variation 2 ***
Body generation
Using chunk_split()
Fatal error: Allowed memory size of %d bytes exhausted%s(tried to allocate %d bytes) in %s on line %d