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tests/nanocoap: add test for option parse overflow

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This commit is contained in:
Ken Bannister 2019-01-12 07:39:39 -05:00 committed by Kaspar Schleiser
parent 4b1b0aa84e
commit 1058a8d07e
1 changed files with 44 additions and 6 deletions
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50
tests/unittests/tests-nanocoap/tests-nanocoap.c
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@ -437,12 +437,13 @@ static void test_nanocoap__server_reply_simple_con(void)
static void test_nanocoap__server_option_count_overflow_check(void)
{
/* this test passes a forged CoAP packet containing 42 options (provided by
* @nmeum in #10753) to coap_parse(). The used coap_pkt_t is part of a
* struct, followed by an array of 42 coap_option_t. The array is cleared
* before the call to coap_parse(). If the overflow protection is working,
* the array must still be clear after parsing the packet, and the proper
* error code (-ENOMEM) is returned. Otherwise, the parsing wrote past
* scratch.pkt, thus the array is not zeroed anymore.
* @nmeum in #10753, 42 is a random number which just needs to be higher
* than NANOCOAP_NOPTS_MAX) to coap_parse(). The used coap_pkt_t is part
* of a struct, followed by an array of 42 coap_option_t. The array is
* cleared before the call to coap_parse(). If the overflow protection is
* working, the array must still be clear after parsing the packet, and the
* proper error code (-ENOMEM) is returned. Otherwise, the parsing wrote
* past scratch.pkt, thus the array is not zeroed anymore.
*/
static uint8_t pkt_data[] = {
@ -481,6 +482,42 @@ static void test_nanocoap__server_option_count_overflow_check(void)
TEST_ASSERT_EQUAL_INT(-ENOMEM, res);
}
/*
* Verifies that coap_parse() recognizes inclusion of too many options.
*/
static void test_nanocoap__server_option_count_overflow(void)
{
/* base pkt is a GET for /riot/value, which results in two options for the
* path, but only 1 entry in the options array.
* Size buf to accept an extra 2-byte option */
unsigned base_len = 17;
uint8_t buf[17 + (2 * NANOCOAP_NOPTS_MAX)] = {
0x42, 0x01, 0xbe, 0x16, 0x35, 0x61, 0xb4, 0x72,
0x69, 0x6f, 0x74, 0x05, 0x76, 0x61, 0x6c, 0x75,
0x65
};
coap_pkt_t pkt;
/* nonsense filler option that contains a single byte of data */
uint8_t fill_opt[] = { 0x11, 0x01 };
/* fill pkt with maximum options; should succeed */
int i = 0;
for (; i < (2 * (NANOCOAP_NOPTS_MAX - 1)); i+=2) {
memcpy(&buf[base_len+i], fill_opt, 2);
}
/* don't read final two bytes, where overflow option will be added later */
int res = coap_parse(&pkt, buf, sizeof(buf) - 2);
TEST_ASSERT_EQUAL_INT(0, res);
/* add option to overflow */
memcpy(&buf[base_len+i], fill_opt, 2);
res = coap_parse(&pkt, buf, sizeof(buf));
TEST_ASSERT(res < 0);
}
Test *tests_nanocoap_tests(void)
{
EMB_UNIT_TESTFIXTURES(fixtures) {
@ -499,6 +536,7 @@ Test *tests_nanocoap_tests(void)
new_TestFixture(test_nanocoap__server_get_req_con),
new_TestFixture(test_nanocoap__server_reply_simple_con),
new_TestFixture(test_nanocoap__server_option_count_overflow_check),
new_TestFixture(test_nanocoap__server_option_count_overflow),
};
EMB_UNIT_TESTCALLER(nanocoap_tests, NULL, NULL, fixtures);