Use PDEATHSIG to kill cli-server workers if parent exists

Closes GH-9476

Zend/zend_mmap.h

@@ -17,7 +17,7 @@
 
 #include "zend_portability.h"
 
-#ifdef __linux__
+#ifdef HAVE_PRCTL
 # include <sys/prctl.h>
 
 /* fallback definitions if our libc is older than the kernel */
@@ -27,7 +27,7 @@
 # ifndef PR_SET_VMA_ANON_NAME
 #  define PR_SET_VMA_ANON_NAME 0
 # endif
-#endif // __linux__
+#endif // HAVE_PRCTL
 
 /**
  * Set a name for the specified memory area.
@@ -36,7 +36,7 @@
  */
 static zend_always_inline void zend_mmap_set_name(const void *start, size_t len, const char *name)
 {
-#ifdef __linux__
+#ifdef HAVE_PRCTL
 	prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME, (unsigned long)start, len, (unsigned long)name);
 #endif
 }

build/php.m4

@@ -2748,3 +2748,29 @@ AC_DEFUN([PHP_PATCH_CONFIG_HEADERS], [
   $SED -e 's/^#undef PACKAGE_[^ ]*/\/\* & \*\//g' < $srcdir/$1 \
     > $srcdir/$1.tmp && mv $srcdir/$1.tmp $srcdir/$1
 ])
+
+dnl Check if we have prctl
+AC_DEFUN([PHP_CHECK_PRCTL],
+[
+  AC_MSG_CHECKING([for prctl])
+
+  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/prctl.h>]], [[prctl(0, 0, 0, 0, 0);]])], [
+    AC_DEFINE([HAVE_PRCTL], 1, [do we have prctl?])
+    AC_MSG_RESULT([yes])
+  ], [
+    AC_MSG_RESULT([no])
+  ])
+])
+
+dnl Check if we have procctl
+AC_DEFUN([PHP_CHECK_PROCCTL],
+[
+  AC_MSG_CHECKING([for procctl])
+
+  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/procctl.h>]], [[procctl(0, 0, 0, 0);]])], [
+    AC_DEFINE([HAVE_PROCCTL], 1, [do we have procctl?])
+    AC_MSG_RESULT([yes])
+  ], [
+    AC_MSG_RESULT([no])
+  ])
+])

configure.ac

@@ -510,6 +510,10 @@ dnl Check __builtin_cpu_init
 PHP_CHECK_BUILTIN_CPU_INIT
 dnl Check __builtin_cpu_supports
 PHP_CHECK_BUILTIN_CPU_SUPPORTS
+dnl Check prctl
+PHP_CHECK_PRCTL
+dnl Check procctl
+PHP_CHECK_PROCCTL
 
 dnl Check for __alignof__ support in the compiler
 AC_CACHE_CHECK(whether the compiler supports __alignof__, ac_cv_alignof_exists,[

sapi/cli/php_cli_server.c

@@ -19,6 +19,7 @@
 #include <stdlib.h>
 #include <fcntl.h>
 #include <assert.h>
+#include <signal.h>
 
 #ifdef PHP_WIN32
 # include <process.h>
@@ -49,6 +50,14 @@
 #include <dlfcn.h>
 #endif
 
+#ifdef HAVE_PRCTL
+# include <sys/prctl.h>
+#endif
+
+#ifdef HAVE_PROCCTL
+# include <sys/procctl.h>
+#endif
+
 #include "SAPI.h"
 #include "php.h"
 #include "php_ini.h"
@@ -2432,6 +2441,24 @@ static char *php_cli_server_parse_addr(const char *addr, int *pport) {
 	return pestrndup(addr, end - addr, 1);
 }
 
+#if defined(HAVE_PRCTL) || defined(HAVE_PROCCTL)
+static void php_cli_server_worker_install_pdeathsig(void)
+{
+	// Ignore failure to register PDEATHSIG, it's not available on all platforms anyway
+#if defined(HAVE_PRCTL)
+	prctl(PR_SET_PDEATHSIG, SIGTERM);
+#elif defined(HAVE_PROCCTL)
+	int signal = SIGTERM;
+	procctl(P_PID, 0, PROC_PDEATHSIG_CTL, &signal);
+#endif
+
+	// Check if parent has exited just after the fork
+	if (getppid() != php_cli_server_master) {
+		exit(1);
+	}
+}
+#endif
+
 static void php_cli_server_startup_workers(void) {
 	char *workers = getenv("PHP_CLI_SERVER_WORKERS");
 	if (!workers) {
@@ -2459,6 +2486,9 @@ static void php_cli_server_startup_workers(void) {
 					php_cli_server_worker + 1;
 				return;
 			} else if (pid == 0) {
+#if defined(HAVE_PRCTL) || defined(HAVE_PROCCTL)
+				php_cli_server_worker_install_pdeathsig();
+#endif
 				return;
 			} else {
 				php_cli_server_workers[php_cli_server_worker] = pid;

sapi/cli/tests/php_cli_server.inc

@@ -4,6 +4,7 @@
 class CliServerInfo {
     public function __construct(
         public string $docRoot,
+        public $processHandle,
     ) {}
 }
 
@@ -113,7 +114,7 @@ function php_cli_server_start(
     define("PHP_CLI_SERVER_PORT", $port);
     define("PHP_CLI_SERVER_ADDRESS", PHP_CLI_SERVER_HOSTNAME.":".PHP_CLI_SERVER_PORT);
 
-    return new CliServerInfo($doc_root);
+    return new CliServerInfo($doc_root, $handle);
 }
 
 function php_cli_server_connect() {

sapi/cli/tests/php_cli_server_pdeathsig.phpt

@@ -0,0 +1,46 @@
+--TEST--
+Killing server should terminate all worker processes
+--ENV--
+PHP_CLI_SERVER_WORKERS=2
+--SKIPIF--
+<?php
+include "skipif.inc";
+if (!(str_contains(PHP_OS, 'Linux') || str_contains(PHP_OS, 'FreeBSD'))) {
+    die('skip PDEATHSIG is only supported on Linux and FreeBSD');
+}
+?>
+--FILE--
+<?php
+
+function split_words(?string $lines): array {
+    return preg_split('(\s)', trim($lines ?? ''), flags: PREG_SPLIT_NO_EMPTY);
+}
+
+function find_workers_by_ppid(string $ppid) {
+    return split_words(shell_exec('pgrep -P ' . $ppid));
+}
+
+function find_workers_by_pids(array $pids) {
+    return split_words(shell_exec('ps -o pid= -p ' . join(',', $pids)));
+}
+
+include "php_cli_server.inc";
+$cliServerInfo = php_cli_server_start('');
+
+$master = proc_get_status($cliServerInfo->processHandle)['pid'];
+$workers = find_workers_by_ppid($master);
+if (count($workers) === 0) {
+    throw new \Exception('Could not find worker pids');
+}
+
+proc_terminate($cliServerInfo->processHandle, 9); // SIGKILL
+
+$workers = find_workers_by_pids($workers);
+if (count($workers) !== 0) {
+    throw new \Exception('Workers were not properly terminated');
+}
+
+echo 'Done';
+?>
+--EXPECT--
+Done

sapi/fpm/config.m4

@@ -13,30 +13,6 @@ AC_DEFUN([AC_FPM_STDLIBS],
   AC_SEARCH_LIBS(inet_addr, nsl)
 ])
 
-AC_DEFUN([AC_FPM_PRCTL],
-[
-  AC_MSG_CHECKING([for prctl])
-
-  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/prctl.h>]], [[prctl(0, 0, 0, 0, 0);]])], [
-    AC_DEFINE([HAVE_PRCTL], 1, [do we have prctl?])
-    AC_MSG_RESULT([yes])
-  ], [
-    AC_MSG_RESULT([no])
-  ])
-])
-
-AC_DEFUN([AC_FPM_PROCCTL],
-[
-  AC_MSG_CHECKING([for procctl])
-
-  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/procctl.h>]], [[procctl(0, 0, 0, 0);]])], [
-    AC_DEFINE([HAVE_PROCCTL], 1, [do we have procctl?])
-    AC_MSG_RESULT([yes])
-  ], [
-    AC_MSG_RESULT([no])
-  ])
-])
-
 AC_DEFUN([AC_FPM_SETPFLAGS],
 [
   AC_MSG_CHECKING([for setpflags])
@@ -530,8 +506,6 @@ if test "$PHP_FPM" != "no"; then
   AC_MSG_RESULT($PHP_FPM)
 
   AC_FPM_STDLIBS
-  AC_FPM_PRCTL
-  AC_FPM_PROCCTL
   AC_FPM_SETPFLAGS
   AC_FPM_CLOCK
   AC_FPM_TRACE

sapi/litespeed/lsapilib.c

@@ -74,10 +74,11 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include <netinet/in.h>
 #include <netinet/tcp.h>
 #include <sys/un.h>
+#include <php_config.h>
 
 #include "lsapilib.h"
 
-#if defined(linux) || defined(__linux) || defined(__linux__) || defined(__gnu_linux__)
+#ifdef HAVE_PRCTL
 #include <sys/prctl.h>
 #endif
 
@@ -381,7 +382,7 @@ static void lsapi_enable_core_dump(void)
 
 #endif
 
-#if defined(linux) || defined(__linux) || defined(__linux__) || defined(__gnu_linux__)
+#ifdef HAVE_PRCTL
     if (prctl(PR_SET_DUMPABLE, s_enable_core_dump,0,0,0) == -1)
         perror( "prctl: Failed to set dumpable, "
                     "core dump may not be available!");