test invalid sendmsg and recvmsg
Syzbot found a double free bug due to failure in sendmsg.
This test exposes the bug.
Reported-by:
Link:
@@ -257,6 +257,47 @@ static int test(int use_sqthread, int regfiles)
return (intptr_t)retval;
}
+static int test_invalid(void)
+{
+ struct io_uring ring;
+ int ret, i;
+ int fds[2];
+ struct io_uring_cqe *cqe;
+ struct io_uring_sqe *sqe;
+
+ ret = t_create_ring(8, &ring, 0);
+ if (ret)
+ return ret;
+
+ ret = t_create_socket_pair(fds, true);
+ if (ret)
+ return ret;
+
+ sqe = io_uring_get_sqe(&ring);
+ io_uring_prep_sendmsg(sqe, fds[0], NULL, MSG_WAITALL);
+ sqe->flags |= IOSQE_ASYNC;
+
+ sqe = io_uring_get_sqe(&ring);
+ io_uring_prep_recvmsg(sqe, fds[1], NULL, 0);
+ sqe->flags |= IOSQE_ASYNC;
+
+ ret = io_uring_submit_and_wait(&ring, 2);
+ if (ret != 2)
+ return ret;
+
+ for (i = 0; i < 2; i++) {
+ ret = io_uring_peek_cqe(&ring, &cqe);
+ if (ret || cqe->res != -EFAULT)
+ return -1;
+ io_uring_cqe_seen(&ring, cqe);
+ }
+
+ io_uring_queue_exit(&ring);
+ close(fds[0]);
+ close(fds[1]);
+ return 0;
+}
+
int main(int argc, char *argv[])
{
int ret;
@@ -264,6 +305,12 @@ int main(int argc, char *argv[])
if (argc > 1)
return 0;
+ ret = test_invalid();
+ if (ret) {
+ fprintf(stderr, "test_invalid failed\n");
+ return ret;
+ }
+
ret = test(0, 0);
if (ret) {
fprintf(stderr, "test sqthread=0 failed\n");
