Open YuanchengJiang opened 1 week ago
The following code:
<?php $array = array (10); $fusion = $array; require(__DIR__ . "/run_bcmath_tests_function.inc"); $exponents = ["252", "-112"]; $baseNumbers = array_merge($fusion, [ ]); run_bcmath_tests($baseNumbers, $exponents, "**", bcpow(...));
Resulted in this output:
==1599205==ERROR: AddressSanitizer: stack-buffer-overflow on address 0x7f0179c71df0 at pc 0x5599a5410139 bp 0x7ffeb0b4acb0 sp 0x7ffeb0b4aca8 WRITE of size 1 at 0x7f0179c71df0 thread T0 #0 0x5599a5410138 in bc_divide /php-src/ext/bcmath/libbcmath/src/div.c:459:12 #1 0x5599a542466f in bc_raise /php-src/ext/bcmath/libbcmath/src/raise.c:95:3 #2 0x5599a53e582f in zif_bcpow /php-src/ext/bcmath/bcmath.c:618:2 #3 0x5599a7e56fac in zend_closure_internal_handler /php-src/Zend/zend_closures.c:724:2 #4 0x5599a8343d67 in ZEND_DO_FCALL_SPEC_RETVAL_USED_HANDLER /php-src/Zend/zend_vm_execute.h:2037:4 #5 0x5599a8086303 in execute_ex /php-src/Zend/zend_vm_execute.h:58565:7 #6 0x5599a8088462 in zend_execute /php-src/Zend/zend_vm_execute.h:64217:2 #7 0x5599a8d886e1 in zend_execute_script /php-src/Zend/zend.c:1928:3 #8 0x5599a769a9d8 in php_execute_script_ex /php-src/main/main.c:2574:13 #9 0x5599a769ba98 in php_execute_script /php-src/main/main.c:2614:9 #10 0x5599a8d9be56 in do_cli /php-src/sapi/cli/php_cli.c:935:5 #11 0x5599a8d96524 in main /php-src/sapi/cli/php_cli.c:1310:18 #12 0x7f017d8e6d8f in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16 #13 0x7f017d8e6e3f in __libc_start_main csu/../csu/libc-start.c:392:3 #14 0x5599a4c03904 in _start (/php-src/sapi/cli/php+0x2403904) (BuildId: d9851980940e1525eb2e61068d0828e86059842d) Address 0x7f0179c71df0 is located in stack of thread T0 at offset 496 in frame #0 0x5599a53e3a8f in zif_bcpow /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 /php-src/ext/bcmath/libbcmath/src/div.c:459:12 in bc_divide Shadow bytes around the buggy address: 0x0fe0af386360: f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 0x0fe0af386370: f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 0x0fe0af386380: f1 f1 f1 f1 00 f2 f2 f2 00 f2 f2 f2 00 f2 f2 f2 0x0fe0af386390: 01 f2 00 f2 f2 f2 00 f2 f2 f2 00 f2 f2 f2 00 00 0x0fe0af3863a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 =>0x0fe0af3863b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00[f3]f3 0x0fe0af3863c0: f3 f3 f3 f3 f3 f3 f3 f3 00 00 00 00 00 00 00 00 0x0fe0af3863d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0fe0af3863e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0fe0af3863f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0fe0af386400: 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 ==1599205==ABORTING
PHP 8.4.0-dev
ubuntu 22.04
Simplied reproducer:
bcpow("10", "-112", 1);
Description
The following code:
Resulted in this output:
PHP Version
PHP 8.4.0-dev
Operating System
ubuntu 22.04