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Add backtrace-based error path testing mechanism

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The new TEST_FAIL and GET_FAIL control interface commands can be used
similarly to the earlier TEST_ALLOC_FAIL/GET_ALLOC_FAIL design. The new
version is more generic framework allowing any function to be annotated
for failure testing with the TEST_FAIL() macro. This mechanism is only
available in builds with CONFIG_WPA_TRACE_BFD=y and
CONFIG_TESTING_OPTIONS=y. For other builds, the TEST_FAIL() macro is
defined to return 0 to allow the compiler to remove the test code from
normal production builds.

As the first test site, allow os_get_random() to be marked for failing
based on call backtrace.

Signed-off-by: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2015-06-28 21:35:43 +03:00
parent 0937ea746b
commit 2da525651d
4 changed files with 170 additions and 0 deletions
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75
src/utils/os_unix.c
View file

@ -226,6 +226,9 @@ int os_get_random(unsigned char *buf, size_t len)
FILE *f;
size_t rc;
if (TEST_FAIL())
return -1;
f = fopen("/dev/urandom", "rb");
if (f == NULL) {
printf("Could not open /dev/urandom.\n");
@ -548,6 +551,78 @@ static int testing_fail_alloc(void)
return 0;
}
char wpa_trace_test_fail_func[256] = { 0 };
unsigned int wpa_trace_test_fail_after;
int testing_test_fail(void)
{
const char *func[WPA_TRACE_LEN];
size_t i, res, len;
char *pos, *next;
int match;
if (!wpa_trace_test_fail_after)
return 0;
res = wpa_trace_calling_func(func, WPA_TRACE_LEN);
i = 0;
if (i < res && os_strcmp(func[i], __func__) == 0)
i++;
pos = wpa_trace_test_fail_func;
match = 0;
while (i < res) {
int allow_skip = 1;
int maybe = 0;
if (*pos == '=') {
allow_skip = 0;
pos++;
} else if (*pos == '?') {
maybe = 1;
pos++;
}
next = os_strchr(pos, ';');
if (next)
len = next - pos;
else
len = os_strlen(pos);
if (os_memcmp(pos, func[i], len) != 0) {
if (maybe && next) {
pos = next + 1;
continue;
}
if (allow_skip) {
i++;
continue;
}
return 0;
}
if (!next) {
match = 1;
break;
}
pos = next + 1;
i++;
}
if (!match)
return 0;
wpa_trace_test_fail_after--;
if (wpa_trace_test_fail_after == 0) {
wpa_printf(MSG_INFO, "TESTING: fail at %s",
wpa_trace_test_fail_func);
for (i = 0; i < res; i++)
wpa_printf(MSG_INFO, "backtrace[%d] = %s",
(int) i, func[i]);
return 1;
}
return 0;
}
#else
static inline int testing_fail_alloc(void)