logd: self-degrade to 'logd' user after opening pipes

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

diff --git a/log/logd.c b/log/logd.c
index 18788fed9a3cfa342e29cefc6498aeebbba337ef..7d531397db2c971d93ce0c58221fa27d33e2313c 100644 (file)
--- a/log/logd.c
+++ b/log/logd.c
@@ -11,6 +11,8 @@
  * GNU General Public License for more details.
  */
 
+#include <sys/types.h>
+#include <pwd.h>
 #include <stdio.h>
 #include <unistd.h>
 #include <syslog.h>
@@ -238,6 +240,7 @@ int
 main(int argc, char **argv)
 {
        int ch, log_size = 16;
+       struct passwd *p = NULL;
 
        signal(SIGPIPE, SIG_IGN);
        while ((ch = getopt(argc, argv, "S:")) != -1) {
@@ -255,6 +258,11 @@ main(int argc, char **argv)
        log_init(log_size);
        conn.cb = ubus_connect_handler;
        ubus_auto_connect(&conn);
+       p = getpwnam("logd");
+       if (p) {
+               setuid(p->pw_uid);
+               setgid(p->pw_gid);
+       }
        uloop_run();
        log_shutdown();
        uloop_done();