SEGV test.c

[YuanchengJiang]

Description

The following code:

<?php
include('encoding_tests.inc');
readConversionTable(__DIR__ . '/data/CP936.txt', $toUnicode, $fromUnicode);
findInvalidChars($toUnicode, $invalid, $truncated);
testAllValidChars($toUnicode, 'CP936', 'UTF-16BE');

Resulted in this output:

/home/phpfuzz/WorkSpace/flowfusion/php-src/ext/zend_test/test.c:739:3: runtime error: member access within misaligned address 0x000000000002 for type 'const zend_op' (aka 'const struct _zend_op'), which requires 8 byte alignment
0x000000000002: note: pointer points here
<memory cannot be printed>
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /home/phpfuzz/WorkSpace/flowfusion/php-src/ext/zend_test/test.c:739:3 in 

To reproduce:

./php-src/sapi/cli/php  -d "zend_test.observe_opline_in_zendmm=1" -d "opcache.enable_cli=1" -d "opcache.jit=1205"  ./test.php

Commit:

7e5ad5caf8e249453a84b4f62565188cf69b877f

Configurations:

CC="clang-12" CXX="clang++-12" CFLAGS="-DZEND_VERIFY_TYPE_INFERENCE" CXXFLAGS="-DZEND_VERIFY_TYPE_INFERENCE" ./configure --enable-debug --enable-address-sanitizer --enable-undefined-sanitizer --enable-re2c-cgoto --enable-fpm --enable-litespeed --enable-phpdbg-debug --enable-zts --enable-bcmath --enable-calendar --enable-dba --enable-dl-test --enable-exif --enable-ftp --enable-gd --enable-gd-jis-conv --enable-mbstring --enable-pcntl --enable-shmop --enable-soap --enable-sockets --enable-sysvmsg --enable-zend-test --with-zlib --with-bz2 --with-curl --with-enchant --with-gettext --with-gmp --with-mhash --with-ldap --with-libedit --with-readline --with-snmp --with-sodium --with-xsl --with-zip --with-mysqli --with-pdo-mysql --with-pdo-pgsql --with-pgsql --with-sqlite3 --with-pdo-sqlite --with-webp --with-jpeg --with-freetype --enable-sigchild --with-readline --with-pcre-jit --with-iconv

Operating System:

Ubuntu 20.04 Host, Docker 0599jiangyc/flowfusion:latest

This report is automatically generated by FlowFusion

PHP Version

7e5ad5caf8e249453a84b4f62565188cf69b877f

Operating System

No response

[iluuu1994]

This only fails together with USE_ZEND_ALLOC, because that skips zend_mm_init() (see alloc_globals_ctor()), and the malloc/tracked_alloc allocator is not expected to be passed to _zend_mm_alloc(), as it doesn't have most structures initialized.

It's probably enough to skip zend_test.observe_opline_in_zendmm=1 tests when USE_ZEND_ALLOC=0 is set.

[iluuu1994]

Oh, I see USE_ZEND_ALLOC=1 is already force-enabled by these tests (e.g. ext/zend_test/tests/opline_dangling.phpt). Hence, this seems like a #wontfix.