log: chown pidfile to current criu user

If criu run with suid bit set, user should be able
to read pidfiles(i.e. service pidfile).
Signed-off-by: Ruslan Kuprieiev <kupruser@gmail.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

log.c

@@ -17,6 +17,7 @@
 #include "util.h"
 #include "cr_options.h"
 #include "servicefd.h"
+#include "security.h"
 
 #define DEFAULT_LOGFD		STDERR_FILENO
 /* Enable timestamps if verbosity is increased from default */
@@ -191,6 +192,12 @@ int write_pidfile(int pid)
 		return -1;
 	}
 
+	if (cr_fchown(fd)) {
+		pr_perror("Can't chown pidfile %s", opts.pidfile);
+		close(fd);
+		return -1;
+	}
+
 	dprintf(fd, "%d", pid);
 	close(fd);
 	return 0;