diff options
| author |   Thomas Weißschuh <thomas.weissschuh@linutronix.de> | 2025-04-11 11:00:54 +0200 |
|---|---|---|
| committer |   Thomas Weißschuh <linux@weissschuh.net> | 2025-04-22 10:59:06 +0200 |
| commit | b0bd7760df94714f78ccf98b3aa612ed71e48770 (patch) | |
| tree | c52caf82698283c73a2577b413fd9abc0dd9505d | |
| parent | selftests/nolibc: rename vfprintf test suite (diff) | |
| download | wireguard-linux-b0bd7760df94714f78ccf98b3aa612ed71e48770.tar.xz wireguard-linux-b0bd7760df94714f78ccf98b3aa612ed71e48770.zip | |
selftests/nolibc: add test for snprintf() truncation
Now that we have a proper snprintf() implementation,
make sure truncation is handled properly.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
| -rw-r--r-- | tools/testing/selftests/nolibc/nolibc-test.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/tools/testing/selftests/nolibc/nolibc-test.c b/tools/testing/selftests/nolibc/nolibc-test.c index 5fb4319545d5..33cd64a1b768 100644 --- a/tools/testing/selftests/nolibc/nolibc-test.c +++ b/tools/testing/selftests/nolibc/nolibc-test.c @@ -1306,7 +1306,8 @@ static int expect_vfprintf(int llen, int c, const char *expected, const char *fm va_start(args, fmt); - w = vsnprintf(buf, sizeof(buf), fmt, args); + /* Only allow writing 21 bytes, to test truncation */ + w = vsnprintf(buf, 21, fmt, args); va_end(args); if (w != c) { @@ -1412,6 +1413,7 @@ static int run_printf(int min, int max) CASE_TEST(pointer); EXPECT_VFPRINTF(3, "0x1", "%p", (void *) 0x1); break; CASE_TEST(uintmax_t); EXPECT_VFPRINTF(20, "18446744073709551615", "%ju", 0xffffffffffffffffULL); break; CASE_TEST(intmax_t); EXPECT_VFPRINTF(20, "-9223372036854775807", "%jd", 0x8000000000000001LL); break; + CASE_TEST(truncation); EXPECT_VFPRINTF(25, "01234567890123456789", "%s", "0123456789012345678901234"); break; CASE_TEST(scanf); EXPECT_ZR(1, test_scanf()); break; case __LINE__: return ret; /* must be last */ |