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fuzz-dhcp6-client: test multiple states

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Then, now all three paths client_process_information(),
client_process_reply(), and client_process_advertise_or_rapid_commit_reply()
in client_receive_message() are fuzzed.
This commit is contained in:
Yu Watanabe
2022-02-08 00:30:56 +09:00
parent bbe3f62a16
commit 013c6904fa
1 changed files with 43 additions and 22 deletions
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65
src/libsystemd-network/fuzz-dhcp6-client.c
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@@ -6,43 +6,49 @@
#include "sd-event.h"
#include "dhcp6-internal.h"
#include "dhcp6-protocol.h"
#include "event-util.h"
#include "fd-util.h"
#include "fuzz.h"
static int test_dhcp_fd[2] = { -1, -1 };
int dhcp6_network_send_udp_socket(int s, struct in6_addr *server_address,
const void *packet, size_t len) {
int dhcp6_network_send_udp_socket(int s, struct in6_addr *server_address, const void *packet, size_t len) {
return len;
}
int dhcp6_network_bind_udp_socket(int index, struct in6_addr *local_address) {
assert_se(socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0, test_dhcp_fd) >= 0);
return test_dhcp_fd[0];
return TAKE_FD(test_dhcp_fd[0]);
}
static void fuzz_client(const uint8_t *data, size_t size, bool is_information_request_enabled) {
_cleanup_(sd_event_unrefp) sd_event *e = NULL;
_cleanup_(sd_dhcp6_client_unrefp) sd_dhcp6_client *client = NULL;
struct in6_addr address = { { { 0xfe, 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x01 } } };
assert_se(sd_event_new(&e) >= 0);
assert_se(sd_dhcp6_client_new(&client) >= 0);
assert_se(sd_dhcp6_client_attach_event(client, e, 0) >= 0);
assert_se(sd_dhcp6_client_set_ifindex(client, 42) == 0);
assert_se(sd_dhcp6_client_set_local_address(client, &address) >= 0);
assert_se(sd_dhcp6_client_set_information_request(client, is_information_request_enabled) == 0);
dhcp6_client_set_test_mode(client, true);
static void fuzz_client(sd_dhcp6_client *client, const uint8_t *data, size_t size, DHCP6State state) {
assert_se(sd_dhcp6_client_set_information_request(client, state == DHCP6_STATE_INFORMATION_REQUEST) >= 0);
assert_se(sd_dhcp6_client_start(client) >= 0);
client->state = state;
if (size >= sizeof(DHCP6Message))
assert_se(dhcp6_client_set_transaction_id(client, ((const DHCP6Message *) data)->transaction_id) == 0);
assert_se(write(test_dhcp_fd[1], data, size) == (ssize_t) size);
sd_event_run(e, UINT64_MAX);
assert_se(sd_event_run(sd_dhcp6_client_get_event(client), UINT64_MAX) > 0);
/* Check the state transition. */
if (client->state != state)
switch (state) {
case DHCP6_STATE_INFORMATION_REQUEST:
assert_se(client->state == DHCP6_STATE_STOPPED);
break;
case DHCP6_STATE_SOLICITATION:
assert_se(IN_SET(client->state, DHCP6_STATE_REQUEST, DHCP6_STATE_BOUND));
break;
case DHCP6_STATE_REQUEST:
assert_se(client->state == DHCP6_STATE_BOUND);
break;
default:
assert_not_reached();
}
assert_se(sd_dhcp6_client_stop(client) >= 0);
@@ -50,14 +56,29 @@ static void fuzz_client(const uint8_t *data, size_t size, bool is_information_re
}
int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
_cleanup_(sd_event_unrefp) sd_event *e = NULL;
_cleanup_(sd_dhcp6_client_unrefp) sd_dhcp6_client *client = NULL;
struct in6_addr address = { { { 0xfe, 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x01 } } };
if (size > 65536)
return 0;
/* This triggers client_receive_advertise */
fuzz_client(data, size, false);
assert_se(sd_event_new(&e) >= 0);
assert_se(sd_dhcp6_client_new(&client) >= 0);
assert_se(sd_dhcp6_client_attach_event(client, e, 0) >= 0);
assert_se(sd_dhcp6_client_set_ifindex(client, 42) >= 0);
assert_se(sd_dhcp6_client_set_local_address(client, &address) >= 0);
dhcp6_client_set_test_mode(client, true);
/* This triggers client_receive_reply */
fuzz_client(data, size, true);
fuzz_client(client, data, size, DHCP6_STATE_INFORMATION_REQUEST);
fuzz_client(client, data, size, DHCP6_STATE_SOLICITATION);
/* If size is zero, then the resend timer will be triggered at first,
* but in the REQUEST state the client must have a lease. */
if (size == 0)
return 0;
fuzz_client(client, data, size, DHCP6_STATE_REQUEST);
return 0;
}