Merge branch 'maint-0.4.2' into release-0.4.2

changes/bug29819

@@ -0,0 +1,8 @@
+  o Minor bugfixes (linux seccomp sandbox):
+    - Correct how we use libseccomp. Particularly, stop assuming that
+      rules are applied in a particular order or that more rules are
+      processed after the first match. Neither is the case! In libseccomp
+      <2.4.0 this lead to some rules having no effect. Libseccomp 2.4.0
+      changed how rules are generated leading to a different ordering
+      which in turn lead to a fatal crash during startup. Fixes bug
+      29819; bugfix on 0.2.5.1-alpha. Patch by Peter Gerber.

changes/bug32778

@@ -0,0 +1,3 @@
+  o Minor bugfixes (windows service):
+    - Initialize publish/subscribe system when running as a windows service.
+      Fixes bug 32778; bugfix on 0.4.1.1-alpha.

src/app/main/main.c

@@ -1237,7 +1237,7 @@ run_tor_main_loop(void)
 }
 
 /** Install the publish/subscribe relationships for all the subsystems. */
-static void
+void
 pubsub_install(void)
 {
     pubsub_builder_t *builder = pubsub_builder_new();
@@ -1249,7 +1249,7 @@ pubsub_install(void)
 
 /** Connect the mainloop to its publish/subscribe message delivery events if
  * appropriate, and configure the global channels appropriately. */
-static void
+void
 pubsub_connect(void)
 {
   if (get_options()->command == CMD_RUN_TOR) {

src/app/main/main.h

@@ -25,4 +25,7 @@ int tor_init(int argc, char **argv);
 
 int run_tor_main_loop(void);
 
+void pubsub_install(void);
+void pubsub_connect(void);
+
 #endif /* !defined(TOR_MAIN_H) */

src/app/main/ntmain.c

@@ -283,7 +283,9 @@ nt_service_body(int argc, char **argv)
     return;
   }
 
+  pubsub_install();
   r = tor_init(backup_argc, backup_argv);
+
   if (r) {
     /* Failed to start the Tor service */
     r = NT_SERVICE_ERROR_TORINIT_FAILED;
@@ -294,6 +296,8 @@ nt_service_body(int argc, char **argv)
     return;
   }
 
+  pubsub_connect();
+
   /* Set the service's status to SERVICE_RUNNING and start the main
    * event loop */
   service_status.dwCurrentState = SERVICE_RUNNING;
@@ -322,9 +326,12 @@ nt_service_main(void)
     errmsg = format_win32_error(result);
     printf("Service error %d : %s\n", (int) result, errmsg);
     tor_free(errmsg);
+
+    pubsub_install();
     if (result == ERROR_FAILED_SERVICE_CONTROLLER_CONNECT) {
       if (tor_init(backup_argc, backup_argv))
         return;
+      pubsub_connect();
       switch (get_options()->command) {
       case CMD_RUN_TOR:
         run_tor_main_loop();

src/lib/sandbox/sandbox.c

@@ -492,24 +492,6 @@ sb_open(scmp_filter_ctx ctx, sandbox_cfg_t *filter)
     }
   }
 
-  rc = seccomp_rule_add_1(ctx, SCMP_ACT_ERRNO(EACCES), SCMP_SYS(open),
-                SCMP_CMP_MASKED(1, O_CLOEXEC|O_NONBLOCK|O_NOCTTY|O_NOFOLLOW,
-                                O_RDONLY));
-  if (rc != 0) {
-    log_err(LD_BUG,"(Sandbox) failed to add open syscall, received libseccomp "
-        "error %d", rc);
-    return rc;
-  }
-
-  rc = seccomp_rule_add_1(ctx, SCMP_ACT_ERRNO(EACCES), SCMP_SYS(openat),
-                SCMP_CMP_MASKED(2, O_CLOEXEC|O_NONBLOCK|O_NOCTTY|O_NOFOLLOW,
-                                O_RDONLY));
-  if (rc != 0) {
-    log_err(LD_BUG,"(Sandbox) failed to add openat syscall, received "
-            "libseccomp error %d", rc);
-    return rc;
-  }
-
   return 0;
 }
 
@@ -563,23 +545,6 @@ sb_chown(scmp_filter_ctx ctx, sandbox_cfg_t *filter)
   return 0;
 }
 
-static int
-sb__sysctl(scmp_filter_ctx ctx, sandbox_cfg_t *filter)
-{
-  int rc;
-  (void) filter;
-  (void) ctx;
-
-  rc = seccomp_rule_add_0(ctx, SCMP_ACT_ERRNO(EPERM), SCMP_SYS(_sysctl));
-  if (rc != 0) {
-    log_err(LD_BUG,"(Sandbox) failed to add _sysctl syscall, "
-        "received libseccomp error %d", rc);
-    return rc;
-  }
-
-  return 0;
-}
-
 /**
  * Function responsible for setting up the rename syscall for
  * the seccomp filter sandbox.
@@ -1148,7 +1113,6 @@ static sandbox_filter_func_t filter_func[] = {
     sb_chmod,
     sb_open,
     sb_openat,
-    sb__sysctl,
     sb_rename,
 #ifdef __NR_fcntl64
     sb_fcntl64,
@@ -1525,14 +1489,14 @@ install_syscall_filter(sandbox_cfg_t* cfg)
   int rc = 0;
   scmp_filter_ctx ctx;
 
-  ctx = seccomp_init(SCMP_ACT_TRAP);
+  ctx = seccomp_init(SCMP_ACT_ERRNO(EPERM));
   if (ctx == NULL) {
     log_err(LD_BUG,"(Sandbox) failed to initialise libseccomp context");
     rc = -1;
     goto end;
   }
 
-  // protectign sandbox parameter strings
+  // protecting sandbox parameter strings
   if ((rc = prot_strings(ctx, cfg))) {
     goto end;
   }