Merge branch 'readonly_config'

[exim.git] / src / src / exim.c

diff --git a/src/src/exim.c b/src/src/exim.c
index 6a9a1477f21e5774fe315050eab5e0373ce00ef3..a42c48b2ca81e488cf556ac54353b7a39c0c3a61 100644 (file)
--- a/src/src/exim.c
+++ b/src/src/exim.c
@@ -211,6 +211,19 @@ exit(1);
 }
 
 
+/***********************************************
+*            Handler for SIGSEGV               *
+***********************************************/
+
+static void
+segv_handler(int sig)
+{
+log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (maybe attempt to write to immutable memory)");
+signal(SIGSEGV, SIG_DFL);
+kill(getpid(), sig);
+}
+
+
 /*************************************************
 *             Handler for SIGUSR1                *
 *************************************************/
@@ -1805,7 +1818,8 @@ descriptive text. */
 
 process_info = store_get(PROCESS_INFO_SIZE, TRUE);     /* tainted */
 set_process_info("initializing");
-os_restarting_signal(SIGUSR1, usr1_handler);
+os_restarting_signal(SIGUSR1, usr1_handler);           /* exiwhat */
+signal(SIGSEGV, segv_handler);                         /* log faults */
 
 /* If running in a dockerized environment, the TERM signal is only
 delegated to the PID 1 if we request it by setting an signal handler */
@@ -3688,7 +3702,7 @@ else
   {
   struct rlimit rlp;
 
-  #ifdef RLIMIT_NOFILE
+#ifdef RLIMIT_NOFILE
   if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
     {
     log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
@@ -3711,9 +3725,9 @@ else
           strerror(errno));
       }
     }
-  #endif
+#endif
 
-  #ifdef RLIMIT_NPROC
+#ifdef RLIMIT_NPROC
   if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
     {
     log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
@@ -3721,20 +3735,20 @@ else
     rlp.rlim_cur = rlp.rlim_max = 0;
     }
 
-  #ifdef RLIM_INFINITY
+# ifdef RLIM_INFINITY
   if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
     {
     rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
-  #else
+# else
   if (rlp.rlim_cur < 1000)
     {
     rlp.rlim_cur = rlp.rlim_max = 1000;
-  #endif
+# endif
     if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
       log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
         strerror(errno));
     }
-  #endif
+#endif
   }
 
 /* Exim is normally entered as root (but some special configurations are
@@ -3857,6 +3871,7 @@ is equivalent to the ability to modify a setuid binary!
 This needs to happen before we read the main configuration. */
 init_lookup_list();
 
+/*XXX this excrescence could move to the testsuite standard config setup file */
 #ifdef SUPPORT_I18N
 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
 #endif
@@ -3895,19 +3910,21 @@ issues (currently about tls_advertise_hosts and keep_environment not being
 defined) */
 
   {
+  int old_pool = store_pool;
 #ifdef MEASURE_TIMING
   struct timeval t0, diff;
   (void)gettimeofday(&t0, NULL);
 #endif
 
+  store_pool = POOL_CONFIG;
   readconf_main(checking || list_options);
+  store_pool = old_pool;
 
 #ifdef MEASURE_TIMING
   report_time_since(&t0, US"readconf_main (delta)");
 #endif
   }
 
-
 /* Now in directory "/" */
 
 if (cleanup_environment() == FALSE)
@@ -4494,7 +4511,13 @@ if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
   event_action gets expanded */
 
   if (msg_action == MSG_REMOVE)
+    {
+    int old_pool = store_pool;
+    store_pool = POOL_CONFIG;
     readconf_rest();
+    store_pool = old_pool;
+    store_writeprotect(POOL_CONFIG);
+    }
 
   if (!one_msg_action)
     {
@@ -4519,12 +4542,16 @@ Now, since the intro of the ${acl } expansion, ACL definitions may be
 needed in transports so we lost the optimisation. */
 
   {
+  int old_pool = store_pool;
 #ifdef MEASURE_TIMING
   struct timeval t0, diff;
   (void)gettimeofday(&t0, NULL);
 #endif
 
+  store_pool = POOL_CONFIG;
   readconf_rest();
+  store_pool = old_pool;
+  store_writeprotect(POOL_CONFIG);
 
 #ifdef MEASURE_TIMING
   report_time_since(&t0, US"readconf_rest (delta)");
@@ -5451,15 +5478,15 @@ that SIG_IGN works. */
 
 if (!f.synchronous_delivery)
   {
-  #ifdef SA_NOCLDWAIT
+#ifdef SA_NOCLDWAIT
   struct sigaction act;
   act.sa_handler = SIG_IGN;
   sigemptyset(&(act.sa_mask));
   act.sa_flags = SA_NOCLDWAIT;
   sigaction(SIGCHLD, &act, NULL);
-  #else
+#else
   signal(SIGCHLD, SIG_IGN);
-  #endif
+#endif
   }
 
 /* Save the current store pool point, for resetting at the start of