Closed
Description
Description
The following code:
<?php
$file = $dirname . 'tmp.zip';
$zip = new ZipArchive;
if (!$zip->open($file, ZipArchive::CREATE)) {
}
$zip->addFromString('�', __FILE__, ZipArchive::FL_ENC_UTF_8);
$fusion = $zip;
require(__DIR__ . "/run_bcmath_tests_function.inc");
$exponents = ["252", "-112"];
run_bcmath_tests($fusion, $exponents, "**", bcpow(...));Resulted in this output:
=================================================================
==845608==ERROR: AddressSanitizer: stack-buffer-overflow on address 0x7ffedda3eff0 at pc 0x000000e6e458 bp 0x7ffedda3e380 sp 0x7ffedda3e378
WRITE of size 1 at 0x7ffedda3eff0 thread T0
#0 0xe6e457 in bc_divide /home/phpfuzz/WorkSpace/flowfusion/php-src/ext/bcmath/libbcmath/src/div.c:464:12
#1 0xe83120 in bc_raise /home/phpfuzz/WorkSpace/flowfusion/php-src/ext/bcmath/libbcmath/src/raise.c:95:7
#2 0xe41e90 in zif_bcpow /home/phpfuzz/WorkSpace/flowfusion/php-src/ext/bcmath/bcmath.c:618:7
#3 0x3d67ff8 in zend_closure_internal_handler /home/phpfuzz/WorkSpace/flowfusion/php-src/Zend/zend_closures.c:724:2
#4 0x4291997 in ZEND_DO_FCALL_SPEC_RETVAL_USED_HANDLER /home/phpfuzz/WorkSpace/flowfusion/php-src/Zend/zend_vm_execute.h:2037:4
#5 0x3fb01c7 in execute_ex /home/phpfuzz/WorkSpace/flowfusion/php-src/Zend/zend_vm_execute.h:58595:7
#6 0x3fb244c in zend_execute /home/phpfuzz/WorkSpace/flowfusion/php-src/Zend/zend_vm_execute.h:64247:2
#7 0x4d48a09 in zend_execute_script /home/phpfuzz/WorkSpace/flowfusion/php-src/Zend/zend.c:1934:3
#8 0x355e25a in php_execute_script_ex /home/phpfuzz/WorkSpace/flowfusion/php-src/main/main.c:2577:13
#9 0x355f398 in php_execute_script /home/phpfuzz/WorkSpace/flowfusion/php-src/main/main.c:2617:9
#10 0x4d5cd1a in do_cli /home/phpfuzz/WorkSpace/flowfusion/php-src/sapi/cli/php_cli.c:938:5
#11 0x4d571ff in main /home/phpfuzz/WorkSpace/flowfusion/php-src/sapi/cli/php_cli.c:1313:18
#12 0x7f282fcddd8f in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16
#13 0x7f282fcdde3f in __libc_start_main csu/../csu/libc-start.c:392:3
#14 0x605a64 in _start (/home/phpfuzz/WorkSpace/flowfusion/php-src/sapi/cli/php+0x605a64)
Address 0x7ffedda3eff0 is located in stack of thread T0 at offset 496 in frame
#0 0xe3ffff in zif_bcpow /home/phpfuzz/WorkSpace/flowfusion/php-src/ext/bcmath/bcmath.c:571
This frame has 8 object(s):
[32, 40) 'base_str' (line 572)
[64, 72) 'exponent_str' (line 572)
[96, 104) 'scale_param' (line 573)
[128, 129) 'scale_param_is_null' (line 574)
[144, 152) 'first' (line 575)
[176, 184) 'bc_exponent' (line 575)
[208, 216) 'result' (line 575)
[240, 496) 'bc_arena' (line 593) <== Memory access at offset 496 overflows this variable
HINT: this may be a false positive if your program uses some custom stack unwind mechanism, swapcontext or vfork
(longjmp and C++ exceptions *are* supported)
SUMMARY: AddressSanitizer: stack-buffer-overflow /home/phpfuzz/WorkSpace/flowfusion/php-src/ext/bcmath/libbcmath/src/div.c:464:12 in bc_divide
Shadow bytes around the buggy address:
0x10005bb3fda0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x10005bb3fdb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x10005bb3fdc0: f1 f1 f1 f1 00 f2 f2 f2 00 f2 f2 f2 00 f2 f2 f2
0x10005bb3fdd0: 01 f2 00 f2 f2 f2 00 f2 f2 f2 00 f2 f2 f2 00 00
0x10005bb3fde0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x10005bb3fdf0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00[f3]f3
0x10005bb3fe00: f3 f3 f3 f3 f3 f3 f3 f3 00 00 00 00 00 00 00 00
0x10005bb3fe10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x10005bb3fe20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x10005bb3fe30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x10005bb3fe40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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
Shadow gap: cc
==845608==ABORTING
PHP Version
nightly
Operating System
ubuntu 22.04