ujail: fix signal forwarding

Signed-off-by: John Crispin <john@phrozen.org>

diff --git a/jail/jail.c b/jail/jail.c
index 8e7cddc997448410ce05fcddde0fe7472596016e..9d7483c9fa4b8f37b9fbb0b65ce27aaa36173efe 100644 (file)
--- a/jail/jail.c
+++ b/jail/jail.c
@@ -25,6 +25,7 @@
 #include <libgen.h>
 #include <sched.h>
 #include <linux/limits.h>
+#include <signal.h>
 
 #include "capabilities.h"
 #include "elf.h"
@@ -298,12 +299,19 @@ static void jail_process_timeout_cb(struct uloop_timeout *t)
        kill(jail_process.pid, SIGKILL);
 }
 
+static void jail_handle_signal(int signo)
+{
+       DEBUG("forwarding signal %d to the jailed process\n", signo);
+       kill(jail_process.pid, signo);
+}
+
 int main(int argc, char **argv)
 {
+       sigset_t sigmask;
        uid_t uid = getuid();
        char log[] = "/dev/log";
        char ubus[] = "/var/run/ubus.sock";
-       int ch;
+       int ch, i;
 
        if (uid) {
                ERROR("not root, aborting: %s\n", strerror(errno));
@@ -397,6 +405,20 @@ int main(int argc, char **argv)
                prctl(PR_SET_NAME, opts.name, NULL, NULL, NULL);
 
        uloop_init();
+
+       sigfillset(&sigmask);
+       for (i = 0; i < _NSIG; i++) {
+               struct sigaction s = { 0 };
+
+               if (!sigismember(&sigmask, i))
+                       continue;
+               if ((i == SIGCHLD) || (i == SIGPIPE))
+                       continue;
+
+               s.sa_handler = jail_handle_signal;
+               sigaction(i, &s, NULL);
+       }
+
        if (opts.namespace) {
                add_mount("/dev/full", 0, -1);
                add_mount("/dev/null", 0, -1);