Closed
Description
Description
The following code:
<?php
class C {
function __toString() {
global $heap;
$heap->extract();
return "0";
}
}
$heap = new SplMinHeap;
for ($i = 0; $i < 100; $i++) {
$heap->insert((string) $i);
}
$heap->insert(new C);Resulted in this output:
=================================================================
==315583==ERROR: AddressSanitizer: heap-use-after-free on address 0x603000028b10 at pc 0x55da198e2595 bp 0x7ffe7f223380 sp 0x7ffe7f223378
READ of size 4 at 0x603000028b10 thread T0
#0 0x55da198e2594 in zend_gc_delref /tmp/php-afl/Zend/zend_types.h:1346:2
#1 0x55da198e2594 in i_zval_ptr_dtor /tmp/php-afl/Zend/zend_variables.h:44:8
#2 0x55da198e2594 in zval_ptr_dtor /tmp/php-afl/Zend/zend_variables.c:84:2
#3 0x55da18c100d9 in spl_ptr_heap_destroy /tmp/php-afl/ext/spl/spl_heap.c:381:3
#4 0x55da18c100d9 in spl_heap_object_free_storage /tmp/php-afl/ext/spl/spl_heap.c:400:2
#5 0x55da1985594f in zend_objects_store_del /tmp/php-afl/Zend/zend_objects_API.c:194:4
#6 0x55da198e3b02 in rc_dtor_func /tmp/php-afl/Zend/zend_variables.c:57:2
#7 0x55da198e3b02 in i_zval_ptr_dtor /tmp/php-afl/Zend/zend_variables.h:45:4
#8 0x55da198e3b02 in zend_reference_destroy /tmp/php-afl/Zend/zend_variables.c:74:2
#9 0x55da198e2523 in rc_dtor_func /tmp/php-afl/Zend/zend_variables.c:57:2
#10 0x55da198e2523 in i_zval_ptr_dtor /tmp/php-afl/Zend/zend_variables.h:45:4
#11 0x55da198e2523 in zval_ptr_dtor /tmp/php-afl/Zend/zend_variables.c:84:2
#12 0x55da1971178f in _zend_hash_del_el_ex /tmp/php-afl/Zend/zend_hash.c:1487:3
#13 0x55da1971178f in _zend_hash_del_el /tmp/php-afl/Zend/zend_hash.c:1514:2
#14 0x55da1972112d in zend_hash_graceful_reverse_destroy /tmp/php-afl/Zend/zend_hash.c:2039:4
#15 0x55da193e3f18 in zend_shutdown_executor_values /tmp/php-afl/Zend/zend_execute_API.c:287:3
#16 0x55da193e84a5 in shutdown_executor /tmp/php-afl/Zend/zend_execute_API.c:442:2
#17 0x55da19901bb9 in zend_deactivate /tmp/php-afl/Zend/zend.c:1341:2
#18 0x55da18fce440 in php_request_shutdown /tmp/php-afl/main/main.c:1950:2
#19 0x55da1991357b in do_cli /tmp/php-afl/sapi/cli/php_cli.c:1106:3
#20 0x55da1990e441 in main /tmp/php-afl/sapi/cli/php_cli.c:1310:18
#21 0x7f7c55629d8f (/lib/x86_64-linux-gnu/libc.so.6+0x29d8f) (BuildId: 490fef8403240c91833978d494d39e537409b92e)
#22 0x7f7c55629e3f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e3f) (BuildId: 490fef8403240c91833978d494d39e537409b92e)
#23 0x55da18202a24 in _start (/workspaces/TriFuzz/targets/php-afl/bin/php+0x402a24)
0x603000028b10 is located 0 bytes inside of 32-byte region [0x603000028b10,0x603000028b30)
freed by thread T0 here:
#0 0x55da18287342 in free /opt/llvm-15-build/llvm-15.x/final/llvm-project/compiler-rt/lib/asan/asan_malloc_linux.cpp:52:3
#1 0x55da198e2523 in rc_dtor_func /tmp/php-afl/Zend/zend_variables.c:57:2
#2 0x55da198e2523 in i_zval_ptr_dtor /tmp/php-afl/Zend/zend_variables.h:45:4
#3 0x55da198e2523 in zval_ptr_dtor /tmp/php-afl/Zend/zend_variables.c:84:2
#4 0x55da18c100d9 in spl_ptr_heap_destroy /tmp/php-afl/ext/spl/spl_heap.c:381:3
#5 0x55da18c100d9 in spl_heap_object_free_storage /tmp/php-afl/ext/spl/spl_heap.c:400:2
#6 0x55da1985594f in zend_objects_store_del /tmp/php-afl/Zend/zend_objects_API.c:194:4
#7 0x55da198e3b02 in rc_dtor_func /tmp/php-afl/Zend/zend_variables.c:57:2
#8 0x55da198e3b02 in i_zval_ptr_dtor /tmp/php-afl/Zend/zend_variables.h:45:4
#9 0x55da198e3b02 in zend_reference_destroy /tmp/php-afl/Zend/zend_variables.c:74:2
#10 0x55da198e2523 in rc_dtor_func /tmp/php-afl/Zend/zend_variables.c:57:2
#11 0x55da198e2523 in i_zval_ptr_dtor /tmp/php-afl/Zend/zend_variables.h:45:4
#12 0x55da198e2523 in zval_ptr_dtor /tmp/php-afl/Zend/zend_variables.c:84:2
#13 0x55da1971178f in _zend_hash_del_el_ex /tmp/php-afl/Zend/zend_hash.c:1487:3
#14 0x55da1971178f in _zend_hash_del_el /tmp/php-afl/Zend/zend_hash.c:1514:2
#15 0x55da1972112d in zend_hash_graceful_reverse_destroy /tmp/php-afl/Zend/zend_hash.c:2039:4
#16 0x55da193e3f18 in zend_shutdown_executor_values /tmp/php-afl/Zend/zend_execute_API.c:287:3
#17 0x55da193e84a5 in shutdown_executor /tmp/php-afl/Zend/zend_execute_API.c:442:2
#18 0x55da19901bb9 in zend_deactivate /tmp/php-afl/Zend/zend.c:1341:2
#19 0x55da18fce440 in php_request_shutdown /tmp/php-afl/main/main.c:1950:2
#20 0x55da1991357b in do_cli /tmp/php-afl/sapi/cli/php_cli.c:1106:3
#21 0x55da1990e441 in main /tmp/php-afl/sapi/cli/php_cli.c:1310:18
#22 0x7f7c55629d8f (/lib/x86_64-linux-gnu/libc.so.6+0x29d8f) (BuildId: 490fef8403240c91833978d494d39e537409b92e)
previously allocated by thread T0 here:
#0 0x55da182875ee in malloc /opt/llvm-15-build/llvm-15.x/final/llvm-project/compiler-rt/lib/asan/asan_malloc_linux.cpp:69:3
#1 0x55da19222cee in __zend_malloc /tmp/php-afl/Zend/zend_alloc.c:3280:14
#2 0x55da1987f9c1 in zend_string_alloc /tmp/php-afl/Zend/zend_string.h:176:36
#3 0x55da1987f9c1 in zend_string_init /tmp/php-afl/Zend/zend_string.h:198:21
#4 0x55da1987f9c1 in zend_long_to_str /tmp/php-afl/Zend/zend_operators.c:3425:23
#5 0x55da1987f9c1 in __zval_get_string_func /tmp/php-afl/Zend/zend_operators.c:1023:11
#6 0x55da1950f1f9 in zval_get_string /tmp/php-afl/Zend/zend_operators.h:327:79
#7 0x55da1950f1f9 in ZEND_CAST_SPEC_CV_HANDLER /tmp/php-afl/Zend/zend_vm_execute.h:40945:4
#8 0x55da194206f0 in execute_ex /tmp/php-afl/Zend/zend_vm_execute.h:58554:7
#9 0x55da19421507 in zend_execute /tmp/php-afl/Zend/zend_vm_execute.h:64206:2
#10 0x55da19908b34 in zend_execute_script /tmp/php-afl/Zend/zend.c:1928:3
#11 0x55da18fd559e in php_execute_script_ex /tmp/php-afl/main/main.c:2574:13
#12 0x55da199126fc in do_cli /tmp/php-afl/sapi/cli/php_cli.c:935:5
#13 0x55da1990e441 in main /tmp/php-afl/sapi/cli/php_cli.c:1310:18
#14 0x7f7c55629d8f (/lib/x86_64-linux-gnu/libc.so.6+0x29d8f) (BuildId: 490fef8403240c91833978d494d39e537409b92e)
SUMMARY: AddressSanitizer: heap-use-after-free /tmp/php-afl/Zend/zend_types.h:1346:2 in zend_gc_delref
Shadow bytes around the buggy address:
0x0c067fffd110: fd fd fa fa fd fd fd fd fa fa fd fd fd fd fa fa
0x0c067fffd120: fd fd fd fd fa fa fd fd fd fd fa fa fd fd fd fd
0x0c067fffd130: fa fa fd fd fd fd fa fa fd fd fd fd fa fa fd fd
0x0c067fffd140: fd fd fa fa fd fd fd fd fa fa fd fd fd fd fa fa
0x0c067fffd150: fd fd fd fd fa fa fd fd fd fd fa fa fd fd fd fd
=>0x0c067fffd160: fa fa[fd]fd fd fd fa fa fd fd fd fd fa fa fd fd
0x0c067fffd170: fd fd fa fa fd fd fd fd fa fa fd fd fd fd fa fa
0x0c067fffd180: fd fd fd fd fa fa 00 00 00 00 fa fa 00 00 00 01
0x0c067fffd190: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c067fffd1a0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c067fffd1b0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
==315583==ABORTING
But I expected this output instead:
no crash
PHP Version
PHP 8.4.0-dev
Operating System
No response