diff options
Diffstat (limited to 'tools/testing/selftests/landlock')
| -rw-r--r-- | tools/testing/selftests/landlock/audit.h | 140 | ||||
| -rw-r--r-- | tools/testing/selftests/landlock/audit_test.c | 6 | ||||
| -rw-r--r-- | tools/testing/selftests/landlock/net_test.c | 62 | ||||
| -rw-r--r-- | tools/testing/selftests/landlock/ptrace_test.c | 1 | ||||
| -rw-r--r-- | tools/testing/selftests/landlock/scoped_abstract_unix_test.c | 1 |
5 files changed, 164 insertions, 46 deletions
diff --git a/tools/testing/selftests/landlock/audit.h b/tools/testing/selftests/landlock/audit.h index 834005b2b0f0..f45fdef35681 100644 --- a/tools/testing/selftests/landlock/audit.h +++ b/tools/testing/selftests/landlock/audit.h @@ -45,17 +45,25 @@ struct audit_message { }; }; -static const struct timeval audit_tv_dom_drop = { +static const struct timeval audit_tv_default = { /* - * Because domain deallocation is tied to asynchronous credential - * freeing, receiving such event may take some time. In practice, - * on a small VM, it should not exceed 100k usec, but let's wait up - * to 1 second to be safe. + * Default socket timeout for audit_match_record() callers that expect a + * record to arrive. Asynchronous kauditd delivery can exceed 1 usec + * under heavy debug configs (KASAN, lockdep), where kauditd_thread + * scheduling between audit_log_end() and netlink_unicast() takes longer + * than the previous 1 usec timeout. 1 second is a generous ceiling: on + * the happy path, kauditd delivers within dozens of usec. */ .tv_sec = 1, }; -static const struct timeval audit_tv_default = { +static const struct timeval audit_tv_fast = { + /* + * Fast timeout for paths that expect no record (audit_init() drain, + * audit_count_records(), probes). Causes audit_recv() to return + * -EAGAIN once the socket buffer is empty, naturally terminating the + * read loop. + */ .tv_usec = 1, }; @@ -334,8 +342,13 @@ static int __maybe_unused matches_log_domain_allocated(int audit_fd, pid_t pid, * Matches a domain deallocation record. When expected_domain_id is non-zero, * the pattern includes the specific domain ID so that stale deallocation * records from a previous test (with a different domain ID) are skipped by - * audit_match_record(), and the socket timeout is temporarily increased to - * audit_tv_dom_drop to wait for the asynchronous kworker deallocation. + * audit_match_record(), waiting for the asynchronous kworker deallocation with + * the default patient timeout. + * + * When expected_domain_id is zero, the caller is probing for any dealloc record + * that may or may not arrive. Temporarily lowers the socket timeout to + * audit_tv_fast for this probe so it returns promptly when no record is + * pending; restores audit_tv_default after. */ static int __maybe_unused matches_log_domain_deallocated(int audit_fd, unsigned int num_denials, @@ -361,16 +374,21 @@ matches_log_domain_deallocated(int audit_fd, unsigned int num_denials, if (log_match_len >= sizeof(log_match)) return -E2BIG; - if (expected_domain_id) - setsockopt(audit_fd, SOL_SOCKET, SO_RCVTIMEO, - &audit_tv_dom_drop, sizeof(audit_tv_dom_drop)); + if (!expected_domain_id) { + if (setsockopt(audit_fd, SOL_SOCKET, SO_RCVTIMEO, + &audit_tv_fast, sizeof(audit_tv_fast))) + return -errno; + } err = audit_match_record(audit_fd, AUDIT_LANDLOCK_DOMAIN, log_match, domain_id); - if (expected_domain_id) - setsockopt(audit_fd, SOL_SOCKET, SO_RCVTIMEO, &audit_tv_default, - sizeof(audit_tv_default)); + if (!expected_domain_id) { + if (setsockopt(audit_fd, SOL_SOCKET, SO_RCVTIMEO, + &audit_tv_default, sizeof(audit_tv_default)) && + !err) + err = -errno; + } return err; } @@ -381,30 +399,46 @@ struct audit_records { }; /* - * WARNING: Do not assert records.domain == 0 without a preceding - * audit_match_record() call. Domain deallocation records are emitted - * asynchronously from kworker threads and can arrive after the drain in - * audit_init(), corrupting the domain count. A preceding audit_match_record() - * call consumes stale records while scanning, making the assertion safe in - * practice because stale deallocation records arrive before the expected access - * records. + * Counts remaining audit records by type, skipping domain deallocation records. + * Deallocation records are emitted asynchronously from kworker threads after a + * previous test's child has exited, so they can arrive after the drain in + * audit_init() and after the preceding audit_match_record() call. Allocation + * records are emitted synchronously during landlock_log_denial() in the current + * test's syscall context, so only those are counted in records->domain. + * + * Temporarily lowers SO_RCVTIMEO to audit_tv_fast for the read loop: this is a + * "no record expected" path that should terminate on the first -EAGAIN. The + * default patient timeout is restored on exit for subsequent + * audit_match_record() callers. */ static int audit_count_records(int audit_fd, struct audit_records *records) { + static const char dealloc_pattern[] = REGEX_LANDLOCK_PREFIX + " status=deallocated "; struct audit_message msg; - int err; + regex_t dealloc_re; + int ret, err = 0; + + ret = regcomp(&dealloc_re, dealloc_pattern, 0); + if (ret) + return -ENOMEM; records->access = 0; records->domain = 0; + if (setsockopt(audit_fd, SOL_SOCKET, SO_RCVTIMEO, &audit_tv_fast, + sizeof(audit_tv_fast))) { + err = -errno; + goto out; + } + do { memset(&msg, 0, sizeof(msg)); err = audit_recv(audit_fd, &msg); if (err) { if (err == -EAGAIN) - return 0; - else - return err; + err = 0; + break; } switch (msg.header.nlmsg_type) { @@ -412,12 +446,24 @@ static int audit_count_records(int audit_fd, struct audit_records *records) records->access++; break; case AUDIT_LANDLOCK_DOMAIN: - records->domain++; + ret = regexec(&dealloc_re, msg.data, 0, NULL, 0); + if (ret == REG_NOMATCH) { + records->domain++; + } else if (ret != 0) { + err = -EIO; + goto out; + } break; } } while (true); - return 0; +out: + if (setsockopt(audit_fd, SOL_SOCKET, SO_RCVTIMEO, &audit_tv_default, + sizeof(audit_tv_default)) && + !err) + err = -errno; + regfree(&dealloc_re); + return err; } static int audit_init(void) @@ -436,9 +482,9 @@ static int audit_init(void) if (err) goto err_close; - /* Sets a timeout for negative tests. */ - err = setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &audit_tv_default, - sizeof(audit_tv_default)); + /* Uses the fast timeout to drain stale records below. */ + err = setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &audit_tv_fast, + sizeof(audit_tv_fast)); if (err) { err = -errno; goto err_close; @@ -454,6 +500,19 @@ static int audit_init(void) while (audit_recv(fd, NULL) == 0) ; + /* + * Restores the default timeout for audit_match_record() callers that + * expect a record to arrive. Paths that expect no record restore the + * fast timeout locally (audit_count_records(), the expected_domain_id + * == 0 probe in matches_log_domain_deallocated()). + */ + err = setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &audit_tv_default, + sizeof(audit_tv_default)); + if (err) { + err = -errno; + goto err_close; + } + return fd; err_close: @@ -494,10 +553,9 @@ static int audit_init_filter_exe(struct audit_filter *filter, const char *path) static int audit_cleanup(int audit_fd, struct audit_filter *filter) { struct audit_filter new_filter; + int err = 0; if (audit_fd < 0 || !filter) { - int err; - /* * Simulates audit_init_with_exe_filter() when called from * FIXTURE_TEARDOWN_PARENT(). @@ -508,23 +566,19 @@ static int audit_cleanup(int audit_fd, struct audit_filter *filter) filter = &new_filter; err = audit_init_filter_exe(filter, NULL); - if (err) { - close(audit_fd); - return err; - } + if (err) + goto err_close; } /* Filters might not be in place. */ audit_filter_exe(audit_fd, filter, AUDIT_DEL_RULE); audit_filter_drop(audit_fd, AUDIT_DEL_RULE); - /* - * Because audit_cleanup() might not be called by the test auditd - * process, it might not be possible to explicitly set it. Anyway, - * AUDIT_STATUS_ENABLED will implicitly be set to 0 when the auditd - * process will exit. - */ - return close(audit_fd); + err = audit_set_status(audit_fd, AUDIT_STATUS_ENABLED, 0); + +err_close: + close(audit_fd); + return err; } static int audit_init_with_exe_filter(struct audit_filter *filter) diff --git a/tools/testing/selftests/landlock/audit_test.c b/tools/testing/selftests/landlock/audit_test.c index 93ae5bd0dcce..bd9f207b36e4 100644 --- a/tools/testing/selftests/landlock/audit_test.c +++ b/tools/testing/selftests/landlock/audit_test.c @@ -730,6 +730,7 @@ TEST_F(audit_flags, signal) } else { EXPECT_EQ(1, records.access); } + EXPECT_EQ(0, records.domain); /* Updates filter rules to match the drop record. */ set_cap(_metadata, CAP_AUDIT_CONTROL); @@ -849,10 +850,8 @@ FIXTURE_SETUP(audit_exec) FIXTURE_TEARDOWN(audit_exec) { set_cap(_metadata, CAP_AUDIT_CONTROL); - EXPECT_EQ(0, audit_filter_exe(self->audit_fd, &self->audit_filter, - AUDIT_DEL_RULE)); + EXPECT_EQ(0, audit_cleanup(self->audit_fd, &self->audit_filter)); clear_cap(_metadata, CAP_AUDIT_CONTROL); - EXPECT_EQ(0, close(self->audit_fd)); } TEST_F(audit_exec, signal_and_open) @@ -917,6 +916,7 @@ TEST_F(audit_exec, signal_and_open) /* Tests that there was no denial until now. */ EXPECT_EQ(0, audit_count_records(self->audit_fd, &records)); EXPECT_EQ(0, records.access); + EXPECT_EQ(0, records.domain); /* * Wait for the child to do a first denied action by layer1 and diff --git a/tools/testing/selftests/landlock/net_test.c b/tools/testing/selftests/landlock/net_test.c index 4c528154ea92..0c256e7c8675 100644 --- a/tools/testing/selftests/landlock/net_test.c +++ b/tools/testing/selftests/landlock/net_test.c @@ -2026,4 +2026,66 @@ TEST_F(audit, connect) EXPECT_EQ(0, close(sock_fd)); } +static int matches_log_tcp_bound(int audit_fd, const char *const addr, + __u16 lport, __u16 dport) +{ + static const char log_template[] = REGEX_LANDLOCK_PREFIX + " blockers=net\\.connect_tcp laddr=%s lport=%u daddr=%s dest=%u$"; + /* Slack for two addresses and two port numbers. */ + char log_match[sizeof(log_template) + 40]; + int log_match_len; + + log_match_len = snprintf(log_match, sizeof(log_match), log_template, + addr, lport, addr, dport); + if (log_match_len > sizeof(log_match)) + return -E2BIG; + + return audit_match_record(audit_fd, AUDIT_LANDLOCK_ACCESS, log_match, + NULL); +} + +/* + * After a bind() to an allowed port, a denied connect must report laddr/lport + * from the bound socket (made available through audit_net.sk) in addition to + * the connect sockaddr's daddr/dest. + */ +TEST_F(audit, connect_tcp_bound) +{ + const struct landlock_ruleset_attr ruleset_attr = { + .handled_access_net = LANDLOCK_ACCESS_NET_BIND_TCP | + LANDLOCK_ACCESS_NET_CONNECT_TCP, + }; + const struct landlock_net_port_attr rule_bind = { + .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP, + .port = self->srv0.port, + }; + struct service_fixture srv_remote; + struct audit_records records; + int ruleset_fd, sock_fd; + + /* Uses a second port as the denied connect target. */ + ASSERT_EQ(0, set_service(&srv_remote, variant->prot, 1)); + + ruleset_fd = + landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0); + ASSERT_LE(0, ruleset_fd); + ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, + &rule_bind, 0)); + enforce_ruleset(_metadata, ruleset_fd); + EXPECT_EQ(0, close(ruleset_fd)); + + sock_fd = socket_variant(&self->srv0); + ASSERT_LE(0, sock_fd); + EXPECT_EQ(0, bind_variant(sock_fd, &self->srv0)); + EXPECT_EQ(-EACCES, connect_variant(sock_fd, &srv_remote)); + EXPECT_EQ(0, matches_log_tcp_bound(self->audit_fd, variant->addr, + self->srv0.port, srv_remote.port)); + + EXPECT_EQ(0, audit_count_records(self->audit_fd, &records)); + EXPECT_EQ(0, records.access); + EXPECT_EQ(1, records.domain); + + EXPECT_EQ(0, close(sock_fd)); +} + TEST_HARNESS_MAIN diff --git a/tools/testing/selftests/landlock/ptrace_test.c b/tools/testing/selftests/landlock/ptrace_test.c index 1b6c8b53bf33..4f64c90583cd 100644 --- a/tools/testing/selftests/landlock/ptrace_test.c +++ b/tools/testing/selftests/landlock/ptrace_test.c @@ -342,6 +342,7 @@ TEST_F(audit, trace) /* Makes sure there is no superfluous logged records. */ EXPECT_EQ(0, audit_count_records(self->audit_fd, &records)); EXPECT_EQ(0, records.access); + EXPECT_EQ(0, records.domain); yama_ptrace_scope = get_yama_ptrace_scope(); ASSERT_LE(0, yama_ptrace_scope); diff --git a/tools/testing/selftests/landlock/scoped_abstract_unix_test.c b/tools/testing/selftests/landlock/scoped_abstract_unix_test.c index c47491d2d1c1..72f97648d4a7 100644 --- a/tools/testing/selftests/landlock/scoped_abstract_unix_test.c +++ b/tools/testing/selftests/landlock/scoped_abstract_unix_test.c @@ -312,6 +312,7 @@ TEST_F(scoped_audit, connect_to_child) /* Makes sure there is no superfluous logged records. */ EXPECT_EQ(0, audit_count_records(self->audit_fd, &records)); EXPECT_EQ(0, records.access); + EXPECT_EQ(0, records.domain); ASSERT_EQ(0, pipe2(pipe_child, O_CLOEXEC)); ASSERT_EQ(0, pipe2(pipe_parent, O_CLOEXEC)); |