Edit report at https://bugs.php.net/bug.php?id=78182&edit=1
ID: 78182
Updated by: ni...@php.net
Reported by: nguyenmanhdung1710 at gmail dot com
Summary: Segmentation fault during by-reference property
assignment
-Status: Verified
+Status: Closed
Type: Bug
Package: Testing related
Operating System: Ubuntu 16.04 x64
PHP Version: 7.4.0alpha1
Block user comment: N
Private report: N
New Comment:
Automatic comment on behalf of nikita....@gmail.com
Revision:
http://git.php.net/?p=php-src.git;a=commit;h=268b5fec8e42e82dce398b86a4970ad8875978d3
Log: Fixed bug #78182
Previous Comments:
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[2019-06-19 14:22:18] ni...@php.net
Cleaned up repro:
<?php
$varName = 'var';
$propName = 'prop';
$$varName->$propName =& $$varName;
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[2019-06-19 14:17:04] ni...@php.net
Based on the trace this has to be on 7.4 or master. I can confirm the segfault
on 7.4.
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[2019-06-19 14:12:06] dan...@php.net
"php version 3.1.6"
That version of PHP is 'slightly' out of date. Can you confirm you really meant
7.3.6?
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[2019-06-19 14:01:30] nguyenmanhdung1710 at gmail dot com
Description:
------------
Our fuzzer found a crash (a potential false positive) on php version 3.1.6
(commit b1bdae7621) due to a malformed input.
PoC: https://github.com/strongcourage/PoCs/blob/master/php_v3.1.6_b1bdae7621/PoC
Command: php $POC
Valgrind says:
==25180== Invalid read of size 1
==25180== at 0x12A5359: zend_object_fetch_property_type_info
(zend_execute.c:2572)
==25180== by 0x12A5359:
ZEND_ASSIGN_OBJ_REF_SPEC_VAR_TMPVAR_OP_DATA_VAR_HANDLER
(zend_vm_execute.h:26956)
==25180== by 0x12D6428: execute_ex (zend_vm_execute.h:62493)
==25180== by 0x130F8DB: zend_execute (zend_vm_execute.h:65287)
==25180== by 0xF374A2: zend_execute_scripts (zend.c:1625)
==25180== by 0xD08147: php_execute_script (main.c:2650)
==25180== by 0x131A67C: do_cli (php_cli.c:985)
==25180== by 0x26F6FC: main (php_cli.c:1375)
==25180== Address 0x125 is not stack'd, malloc'd or (recently) free'd
ASAN says:
ASAN:DEADLYSIGNAL
=================================================================
==11961==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000124 (pc
0x5654a71320f8 bp 0x7ffc1c9e4470 sp 0x7ffc1c9e4460 T0)
==11961==The signal is caused by a READ memory access.
==11961==Hint: address points to the zero page.
#0 0x5654a71320f7 in zend_object_fetch_property_type_info
/home/dungnm/fuzzing/php-7.3.6/Zend/zend_execute.c:2572
#1 0x5654a7293da3 in
ZEND_ASSIGN_OBJ_REF_SPEC_VAR_TMPVAR_OP_DATA_VAR_HANDLER
/home/dungnm/fuzzing/php-7.3.6/Zend/zend_vm_execute.h:26956
#2 0x5654a741388d in execute_ex
/home/dungnm/fuzzing/php-7.3.6/Zend/zend_vm_execute.h:62493
#3 0x5654a742a6f5 in zend_execute
/home/dungnm/fuzzing/php-7.3.6/Zend/zend_vm_execute.h:65287
#4 0x5654a6fab1e2 in zend_execute_scripts
/home/dungnm/fuzzing/php-7.3.6/Zend/zend.c:1625
#5 0x5654a6e04ee1 in php_execute_script
/home/dungnm/fuzzing/php-7.3.6/main/main.c:2650
#6 0x5654a7433157 in do_cli
/home/dungnm/fuzzing/php-7.3.6/sapi/cli/php_cli.c:985
#7 0x5654a74358aa in main
/home/dungnm/fuzzing/php-7.3.6/sapi/cli/php_cli.c:1375
#8 0x7f4efe1a9b96 in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x21b96)
#9 0x5654a6513369 in _start
(/home/dungnm/fuzzing/php-7.3.6/obj-asan/sapi/cli/php+0x341369)
Thanks,
Manh Dung
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Edit this bug report at https://bugs.php.net/bug.php?id=78182&edit=1
