PHP :: Bug #44046 :: array_slice(&$offset, $offset) crash
| Bug #44046 | array_slice(&$offset, $offset) crash | ||||
|---|---|---|---|---|---|
| Submitted: | 2008-02-04 22:31 UTC | Modified: | 2008-02-05 16:02 UTC | ||
| From: | victor dot stinner at haypocalc dot com | Assigned: | |||
| Status: | Closed | Package: | Arrays related | ||
| PHP Version: | 5.2.5 | OS: | Linux (Ubuntu Gutsy) on i386 | ||
| Private report: | No | CVE-ID: | None | ||
[2008-02-04 22:31 UTC] victor dot stinner at haypocalc dot com
Description:
------------
Code to crash PHP5 :
* ? $input = Array("array"); array_slice(&$input, &$input); ?
* ? $input = Array("array"); array_slice(&$input, 0, &$input); ?
* ? $input = Array("array"); array_slice(&$input, 0, 0, &$input); ?
array_slice() first checks first argument ($input) and then converts other arguments ($offset to long, $length to long, $preverse_keys to boolean). If arguments are shared as reference, $input type can change (to long or boolean).
Crash occurs in instruction ? num_in = zend_hash_num_elements(Z_ARRVAL_PP(input)) ? : it reads ((HashTable*)input)->inconsistent. If input is 0 or 1, input read does crash with segmentation fault.
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[2008-02-04 22:53 UTC] victor dot stinner at haypocalc dot com
gdb session: * $input type in array_slice() entry: (gdb) print (**input).type $1 = 4 '\004' # IS_ARRAY * $input type after execution of convert_to_long_ex() or convert_to_boolean_ex() : (gdb) print (**input).type $4 = 1 '\001' # IS_LONG * Execution of ? num_in = zend_hash_num_elements(Z_ARRVAL_PP(input)) ? : Program received signal SIGSEGV, Segmentation fault. (gdb) where #0 0x083281ad in _zend_is_inconsistent (ht=0x1, file=0x8451248 "/home/haypo/php-5.2.5/Zend/zend_hash.c", line=1015) at /home/haypo/php-5.2.5/Zend/zend_hash.c:53 #1 0x0832ae37 in zend_hash_num_elements (ht=0x1) at /home/haypo/php-5.2.5/Zend/zend_hash.c:1015 #2 0x08226ff2 in zif_array_slice (ht=3, return_value=0x853e928, return_value_ptr=0x0, this_ptr=0x0, return_value_used=0) at /home/haypo/php-5.2.5/ext/standard/array.c:2253 (...) (gdb) frame 2 #2 0x08226ff2 in zif_array_slice (ht=3, return_value=0x853e928, return_value_ptr=0x0, this_ptr=0x0, return_value_used=0) at /home/haypo/php-5.2.5/ext/standard/array.c:2253 2253 num_in = zend_hash_num_elements(Z_ARRVAL_PP(input)); (gdb) print (**input).type $2 = 1 '\001'[2008-02-05 16:02 UTC] iliaa@php.net