The zero_len fixture injects raw pre-encrypted records over a socket carrying a TLS_RX key only, and its record table already holds zero-length application_data records. Every variant reads them back with a plain recv(), so neither the splice path nor MSG_PEEK is exercised against a record that decrypts to no payload.
Add zero_len_splice. An empty data record splices zero bytes, and a zero return from splice() means EOF, so a peer that sends one ends a connection that is still live. Its variants expect the payload's length when one sits behind a run of empty records, EAGAIN when nothing does, and EINVAL when a control record does; an unfixed kernel reports 0 for all three. Add zero_len_peek, which checks that a peek reaches the payload behind such a run and leaves it in place for the read that follows. That one reproduces no failure: the unbounded rx_list growth it accompanies needs a sustained flood that three fixed-sequence records cannot supply. Signed-off-by: Chuck Lever <[email protected]> --- tools/testing/selftests/net/tls.c | 213 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 213 insertions(+) diff --git a/tools/testing/selftests/net/tls.c b/tools/testing/selftests/net/tls.c index cbdd3ea28b99..089e940ac43d 100644 --- a/tools/testing/selftests/net/tls.c +++ b/tools/testing/selftests/net/tls.c @@ -2573,6 +2573,219 @@ TEST_F(zero_len, test) } }; +static void zero_len_sock_pair(struct __test_metadata *_metadata, + int *fd, int *cfd, bool *notls) +{ + struct tls_crypto_info_keys tls12; + int ret; + + tls_crypto_info_init(TLS_1_2_VERSION, TLS_CIPHER_AES_CCM_128, + &tls12, 0); + + ulp_sock_pair(_metadata, fd, cfd, notls); + if (*notls) + return; + + /* fd stays keyless; these fixtures send raw records over it */ + ret = setsockopt(*cfd, SOL_TLS, TLS_RX, &tls12, tls12.len); + ASSERT_EQ(ret, 0); +} + +/* Send a variant's records; return the last one carrying payload */ +static const struct raw_rec * +zero_len_send_recs(struct __test_metadata *_metadata, int fd, + const struct raw_rec *const *recs) +{ + const struct raw_rec *payload = NULL; + int i; + + for (i = 0; i < 4 && recs[i]; i++) { + EXPECT_EQ(send(fd, recs[i]->cipher_data, recs[i]->cipher_len, 0), + recs[i]->cipher_len); + if (recs[i]->plain_len) + payload = recs[i]; + } + + return payload; +} + +FIXTURE(zero_len_peek) +{ + int fd, cfd; + bool notls; +}; + +FIXTURE_VARIANT(zero_len_peek) +{ + const struct raw_rec *recs[4]; + ssize_t peek_ret; +}; + +FIXTURE_VARIANT_ADD(zero_len_peek, 0data_0data_data) +{ + .recs = { &id0_data_l0, &id1_data_l0, &id2_data_l11, }, + .peek_ret = 11, +}; + +FIXTURE_VARIANT_ADD(zero_len_peek, 0data_0data_0data) +{ + .recs = { &id0_data_l0, &id1_data_l0, &id2_data_l0, }, + .peek_ret = -EAGAIN, +}; + +FIXTURE_SETUP(zero_len_peek) +{ + zero_len_sock_pair(_metadata, &self->fd, &self->cfd, &self->notls); +} + +FIXTURE_TEARDOWN(zero_len_peek) +{ + close(self->fd); + close(self->cfd); +} + +/* Peeking past a run of empty data records must reach the payload + * behind them, and a run with no payload behind it must report EAGAIN + * rather than the zero return that means EOF. + */ +TEST_F(zero_len_peek, test) +{ + const struct raw_rec *payload; + unsigned char buf[128]; + ssize_t ret; + + if (self->notls) + SKIP(return, "no TLS support"); + + payload = zero_len_send_recs(_metadata, self->fd, variant->recs); + + if (variant->peek_ret < 0) { + ret = recv(self->cfd, buf, sizeof(buf), + MSG_DONTWAIT | MSG_PEEK); + EXPECT_EQ(ret, -1); + if (ret == -1) + EXPECT_EQ(errno, -variant->peek_ret); + return; + } + + ret = recv(self->cfd, buf, sizeof(buf), MSG_DONTWAIT | MSG_PEEK); + EXPECT_EQ(ret, variant->peek_ret); + if (ret == variant->peek_ret) + EXPECT_EQ(memcmp(buf, payload->plain_data, + variant->peek_ret), 0); + + /* Peeking left the payload in place for the read that follows */ + ret = recv(self->cfd, buf, sizeof(buf), MSG_DONTWAIT); + EXPECT_EQ(ret, variant->peek_ret); + if (ret == variant->peek_ret) + EXPECT_EQ(memcmp(buf, payload->plain_data, + variant->peek_ret), 0); + + ret = recv(self->cfd, buf, sizeof(buf), MSG_DONTWAIT); + EXPECT_EQ(ret, -1); + if (ret == -1) + EXPECT_EQ(errno, EAGAIN); +} + +FIXTURE(zero_len_splice) +{ + int fd, cfd; + bool notls; +}; + +FIXTURE_VARIANT(zero_len_splice) +{ + const struct raw_rec *recs[4]; + ssize_t splice_ret; +}; + +FIXTURE_VARIANT_ADD(zero_len_splice, 0data_data) +{ + .recs = { &id0_data_l0, &id1_data_l11, }, + .splice_ret = 11, +}; + +FIXTURE_VARIANT_ADD(zero_len_splice, 0data_0data_data) +{ + .recs = { &id0_data_l0, &id1_data_l0, &id2_data_l11, }, + .splice_ret = 11, +}; + +FIXTURE_VARIANT_ADD(zero_len_splice, 0data_0data_0data) +{ + .recs = { &id0_data_l0, &id1_data_l0, &id2_data_l0, }, + .splice_ret = -EAGAIN, +}; + +FIXTURE_VARIANT_ADD(zero_len_splice, 0data_0ctrl) +{ + .recs = { &id0_data_l0, &id1_ctrl_l0, }, + .splice_ret = -EINVAL, +}; + +FIXTURE_SETUP(zero_len_splice) +{ + zero_len_sock_pair(_metadata, &self->fd, &self->cfd, &self->notls); +} + +FIXTURE_TEARDOWN(zero_len_splice) +{ + close(self->fd); + close(self->cfd); +} + +/* An empty data record splices zero bytes, which a splice caller reads + * as EOF. Splicing must skip past such a record to the payload behind + * it, and report EAGAIN when a run of them has no payload behind it. + * A control record behind the run reports EINVAL, the error splice + * already reports for a control record it meets first. + */ +TEST_F(zero_len_splice, test) +{ + const struct raw_rec *payload; + unsigned char buf[128]; + ssize_t ret; + int p[2]; + + if (self->notls) + SKIP(return, "no TLS support"); + + ASSERT_GE(pipe(p), 0); + + payload = zero_len_send_recs(_metadata, self->fd, variant->recs); + + if (variant->splice_ret < 0) { + ret = splice(self->cfd, NULL, p[1], NULL, sizeof(buf), + SPLICE_F_NONBLOCK); + EXPECT_EQ(ret, -1); + if (ret == -1) + EXPECT_EQ(errno, -variant->splice_ret); + } else { + /* Assert: a zero return, which is what an unfixed kernel + * gives here, leaves the pipe empty, and the read below + * would then block until the harness timeout. + */ + ASSERT_EQ(splice(self->cfd, NULL, p[1], NULL, sizeof(buf), + SPLICE_F_NONBLOCK), variant->splice_ret); + ret = read(p[0], buf, sizeof(buf)); + EXPECT_EQ(ret, variant->splice_ret); + if (ret == variant->splice_ret) + EXPECT_EQ(memcmp(buf, payload->plain_data, + variant->splice_ret), 0); + + /* Reaching the payload consumed the empty records ahead + * of it rather than leaving them on the receive queue + */ + ret = recv(self->cfd, buf, sizeof(buf), MSG_DONTWAIT); + EXPECT_EQ(ret, -1); + if (ret == -1) + EXPECT_EQ(errno, EAGAIN); + } + + close(p[0]); + close(p[1]); +} + FIXTURE(tls_err) { int fd, cfd; -- 2.54.0
