Do not set PR_SET_DUMPABLE by default

sapi/fpm/fpm/fpm_conf.c

@@ -132,6 +132,7 @@ static struct ini_value_parser_s ini_fpm_pool_options[] = {
 	{ "listen.mode",               &fpm_conf_set_string,      WPO(listen_mode) },
 	{ "listen.allowed_clients",    &fpm_conf_set_string,      WPO(listen_allowed_clients) },
 	{ "process.priority",          &fpm_conf_set_integer,     WPO(process_priority) },
+	{ "process.dumpable",          &fpm_conf_set_boolean,     WPO(process_dumpable) },
 	{ "pm",                        &fpm_conf_set_pm,          WPO(pm) },
 	{ "pm.max_children",           &fpm_conf_set_integer,     WPO(pm_max_children) },
 	{ "pm.start_servers",          &fpm_conf_set_integer,     WPO(pm_start_servers) },
@@ -613,6 +614,7 @@ static void *fpm_worker_pool_config_alloc() /* {{{ */
 	wp->config->listen_backlog = FPM_BACKLOG_DEFAULT;
 	wp->config->pm_process_idle_timeout = 10; /* 10s by default */
 	wp->config->process_priority = 64; /* 64 means unset */
+	wp->config->process_dumpable = 0;
 	wp->config->clear_env = 1;
 
 	if (!fpm_worker_all_pools) {
@@ -1602,6 +1604,7 @@ static void fpm_conf_dump() /* {{{ */
 		} else {
 			zlog(ZLOG_NOTICE, "\tprocess.priority = %d", wp->config->process_priority);
 		}
+		zlog(ZLOG_NOTICE, "\tprocess.dumpable = %s",           BOOL2STR(wp->config->process_dumpable));
 		zlog(ZLOG_NOTICE, "\tpm = %s",                         PM2STR(wp->config->pm));
 		zlog(ZLOG_NOTICE, "\tpm.max_children = %d",            wp->config->pm_max_children);
 		zlog(ZLOG_NOTICE, "\tpm.start_servers = %d",           wp->config->pm_start_servers);

sapi/fpm/fpm/fpm_conf.h

@@ -64,6 +64,7 @@ struct fpm_worker_pool_config_s {
 	char *listen_mode;
 	char *listen_allowed_clients;
 	int process_priority;
+	int process_dumpable;
 	int pm;
 	int pm_max_children;
 	int pm_start_servers;

sapi/fpm/fpm/fpm_unix.c

@@ -398,7 +398,7 @@ int fpm_unix_init_child(struct fpm_worker_pool_s *wp) /* {{{ */
 	}
 
 #ifdef HAVE_PRCTL
-	if (0 > prctl(PR_SET_DUMPABLE, 1, 0, 0, 0)) {
+	if (wp->config->process_dumpable && 0 > prctl(PR_SET_DUMPABLE, 1, 0, 0, 0)) {
 		zlog(ZLOG_SYSERROR, "[pool %s] failed to prctl(PR_SET_DUMPABLE)", wp->config->name);
 	}
 #endif

sapi/fpm/php-fpm.conf.in

@@ -197,6 +197,12 @@ listen = 127.0.0.1:9000
 ; Default Value: no set
 ; process.priority = -19
 
+; Set the process dumpable flag (PR_SET_DUMPABLE prctl) even if the process user
+; or group is differrent than the master process user. It allows to create process
+; core dump and ptrace the process for the pool user.
+; Default Value: no
+; process.dumpable = yes
+
 ; Choose how the process manager will control the number of child processes.
 ; Possible Values:
 ;   static  - a fixed number (pm.max_children) of child processes;