Fix opcache checksum calc for inheritance_cache

Fixes phpGH-8065

Author: iluuu1994

ext/opcache/ZendAccelerator.c

@@ -2114,7 +2114,7 @@ zend_op_array *persistent_compile_file(zend_file_handle *file_handle, int type)
 		unsigned int checksum = zend_accel_script_checksum(persistent_script);
 		if (checksum != persistent_script->dynamic_members.checksum ) {
 			/* The checksum is wrong */
-			zend_accel_error(ACCEL_LOG_INFO, "Checksum failed for '%s':  expected=0x%08x, found=0x%08x",
+			zend_accel_error(ACCEL_LOG_WARNING, "Checksum failed for '%s':  expected=0x%08x, found=0x%08x",
 							 ZSTR_VAL(persistent_script->script.filename), persistent_script->dynamic_members.checksum, checksum);
 			zend_shared_alloc_lock();
 			if (!persistent_script->corrupted) {

ext/opcache/tests/gh8065.inc

@@ -0,0 +1,3 @@
+<?php
+
+class Bar extends Foo {}

ext/opcache/tests/gh8065.phpt

@@ -0,0 +1,22 @@
+--TEST--
+Bug GH-8065: Opcache chdir() breaks persistent script checksum
+--INI--
+opcache.enable=1
+opcache.enable_cli=1
+opcache.consistency_checks=1
+opcache.log_verbosity_level=2
+opcache.protect_memory=1
+--EXTENSIONS--
+opcache
+--FILE--
+<?php
+
+class Foo {}
+
+require_once __DIR__ . '/gh8065.inc';
+
+echo "Done\n";
+
+?>
+--EXPECT--
+Done

ext/opcache/zend_accelerator_util_funcs.c

@@ -353,12 +353,31 @@ unsigned int zend_accel_script_checksum(zend_persistent_script *persistent_scrip
 		mem  += (unsigned char*)persistent_script - mem;
 	}
 
+	// zend_class_entry.inheritance_cache is mutated, so we need to reset it before
+	HashTable inheritance_cache_backup;
+	zend_hash_init(&inheritance_cache_backup, zend_hash_num_elements(&persistent_script->script.class_table), NULL, NULL, 0);
+	zend_class_entry *class;
+	ZEND_HASH_FOREACH_PTR(&persistent_script->script.class_table, class) {
+		if (!class->inheritance_cache) {
+			continue;
+		}
+		zend_hash_add_ptr(&inheritance_cache_backup, class->name, class->inheritance_cache);
+		class->inheritance_cache = NULL;
+	} ZEND_HASH_FOREACH_END();
+
 	zend_adler32(checksum, mem, persistent_script_check_block_size);
 	mem  += sizeof(*persistent_script);
 	size -= sizeof(*persistent_script);
 
 	if (size > 0) {
 		checksum = zend_adler32(checksum, mem, size);
 	}
+
+	// Restore the zend_class_entry.inheritance_cache
+	ZEND_HASH_FOREACH_PTR(&persistent_script->script.class_table, class) {
+		class->inheritance_cache = zend_hash_find_ptr(&inheritance_cache_backup, class->name);
+	} ZEND_HASH_FOREACH_END();
+	zend_hash_destroy(&inheritance_cache_backup);
+
 	return checksum;
 }