Merge branch 'PHP-7.3' into PHP-7.4

* PHP-7.3:
  Fix #79825: opcache.file_cache causes SIGSEGV with custom opcode handlers

diff --cc NEWS
index 2a3c248d2677e8043dcdfb58130eb9afec6af3e6,a037e2f28a0ab0192131590c420a275e65f43214..757d225a4ab1e9ad8c169eb575dd774686c3350d
--- 1/NEWS
--- 2/NEWS
+++ b/NEWS
@@@ -22,7 -18,8 +22,9 @@@ PH
  - OPcache:
    . Fixed bug #80002 (calc free space for new interned string is wrong).
      (t-matsuno)
 +  . Fixed bug #80046 (FREE for SWITCH_STRING optimized away). (Nikita)
+   . Fixed bug #79825 (opcache.file_cache causes SIGSEGV when custom opcode
+     handlers changed). (SammyK)
  
  - PDO:
    . Fixed bug #80027 (Terrible performance using $query->fetch on queries with

diff --cc ext/opcache/ZendAccelerator.c
index 6564e4ecc3ede2a56f3baf4e52dd937e2a7dab92,3c6a1ae6890b412b27cccb3ef851971ab40381b7..25148b0d4a5a1c66f4d3fa2ba32c04ec4214a5f6
--- 1/ext/opcache/ZendAccelerator.c
--- 2/ext/opcache/ZendAccelerator.c
+++ b/ext/opcache/ZendAccelerator.c
@@@ -2654,7 -2689,12 +2654,10 @@@ static void accel_globals_ctor(zend_acc
  static void accel_gen_system_id(void)
  {
        PHP_MD5_CTX context;
 -      unsigned char digest[16], c;
 -      char *md5str = ZCG(system_id);
 -      int i;
 +      unsigned char digest[16];
+       zend_module_entry *module;
+       zend_extension *extension;
+       zend_llist_position pos;
  
        PHP_MD5Init(&context);
        PHP_MD5Update(&context, PHP_VERSION, sizeof(PHP_VERSION)-1);
@@@ -2665,8 -2705,28 +2668,21 @@@
                PHP_MD5Update(&context, __DATE__, sizeof(__DATE__)-1);
                PHP_MD5Update(&context, __TIME__, sizeof(__TIME__)-1);
        }
+       /* Modules may have changed after restart which can cause dangling pointers from
+      * custom opcode handlers in the second-level cache files
+      */
+       ZEND_HASH_FOREACH_PTR(&module_registry, module) {
+               PHP_MD5Update(&context, module->name, strlen(module->name));
+               PHP_MD5Update(&context, module->version, strlen(module->version));
+       } ZEND_HASH_FOREACH_END();
+       extension = (zend_extension *) zend_llist_get_first_ex(&zend_extensions, &pos);
+       while (extension) {
+               PHP_MD5Update(&context, extension->name, strlen(extension->name));
+               PHP_MD5Update(&context, extension->version, strlen(extension->version));
+               extension = (zend_extension *) zend_llist_get_next_ex(&zend_extensions, &pos);
+       }
        PHP_MD5Final(digest, &context);
 -      for (i = 0; i < 16; i++) {
 -              c = digest[i] >> 4;
 -              c = (c <= 9) ? c + '0' : c - 10 + 'a';
 -              md5str[i * 2] = c;
 -              c = digest[i] &  0x0f;
 -              c = (c <= 9) ? c + '0' : c - 10 + 'a';
 -              md5str[(i * 2) + 1] = c;
 -      }
 +      php_hash_bin2hex(accel_system_id, digest, sizeof digest);
  }
  
  #ifdef HAVE_HUGE_CODE_PAGES