tty: Restore peers uid, gid

Currently when we create peers we don't consider
if they were owned by someone else. Lest carry
uid/gid into image and restore then.

https://github.com/xemul/criu/issues/198Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Reviewed-by: Dmitry Safonov <dsafonov@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

criu/tty.c

@@ -838,6 +838,16 @@ static int restore_tty_params(int fd, struct tty_info *info)
 		winsize_copy(&p.w, info->tie->winsize);
 	}
 
+	if (info->tie->has_uid && info->tie->has_gid) {
+		if (fchown(fd, info->tie->uid, info->tie->gid)) {
+			pr_perror("Can't setup uid %d gid %d on %x\n",
+				  (int)info->tie->uid,
+				  (int)info->tie->gid,
+				  info->tfe->id);
+			return -1;
+		}
+	}
+
 	return userns_call(do_restore_tty_parms, UNS_ASYNC, &p, sizeof(p), fd);
 }
 
@@ -1714,6 +1724,11 @@ static int dump_tty_info(int lfd, u32 id, const struct fd_parms *p, struct tty_d
 	info.exclusive		= pti->st_excl;
 	info.packet_mode	= pti->st_pckt;
 
+	info.has_uid		= true;
+	info.uid		= userns_uid(p->stat.st_uid);
+	info.has_gid		= true;
+	info.gid		= userns_gid(p->stat.st_gid);
+
 	info.type = driver->type;
 	if (info.type == TTY_TYPE__PTY) {
 		info.pty	= &pty;

images/tty.proto

@@ -70,6 +70,9 @@ message tty_info_entry {
 	 */
 	optional tty_pty_entry		pty		= 12;
 	optional uint32			dev		= 13;
+
+	optional uint32			uid		= 14;
+	optional uint32			gid		= 15;
 };
 
 message tty_file_entry {