Closed
Description
Description
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 Version
PHP 8.4.0-dev
Operating System
ubuntu 22.04