UBSan: Negation of PHP_INT_MIN triggers runtime error in streams/memory.c via SplTempFileObject::fseek

Description

The following code:

<?php
$cls = new SplTempFileObject();
$fusion = $cls;
var_dump($fusion->fseek(PHP_INT_MIN, SEEK_END));

Resulted in this output:

/home/phpfuzz/WorkSpace/flowfusion/php-src/main/streams/memory.c:168:45: runtime error: negation of -9223372036854775808 cannot be represented in type 'zend_off_t' (aka 'long'); cast to an unsigned type to negate this value to itself
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /home/phpfuzz/WorkSpace/flowfusion/php-src/main/streams/memory.c:168:45 in 

To reproduce:

./php-src/sapi/cli/php  ./test.php

Commit:

9ab800ec9b5959dfe3d4cde50f7a27a763d102f8

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

nightly

Operating System

No response

main/streams/memory.c の 168 行目付近から開始し、test.php にある PHP_INT_MIN と SEEK_END を使った提供済みの再現手順で SplTempFileObject::fseek のエントリーポイントを追跡します。レポートに示されている UBSan コマンドを実行します。この入力で negation runtime error が発生しなくなれば完了です。