This patch adds a "positive" pattern for "%c", which intentionally uses a
__u32 value (0x64636261, "dbca") to print a single character "a". If the
implementation went wrong, other 3 bytes might show up as the part of the
latter "%+05s".
Also, this patch adds two "negative" patterns for wide character.
Signed-off-by: Kuniyuki Iwashima <kuniyu@xxxxxxxxxxxx>
---
tools/testing/selftests/bpf/prog_tests/snprintf.c | 4 +++-
tools/testing/selftests/bpf/progs/test_snprintf.c | 7 ++++---
2 files changed, 7 insertions(+), 4 deletions(-)
diff --git a/tools/testing/selftests/bpf/prog_tests/snprintf.c b/tools/testing/selftests/bpf/prog_tests/snprintf.c
index dffbcaa1ec98..f77d7def7fed 100644
--- a/tools/testing/selftests/bpf/prog_tests/snprintf.c
+++ b/tools/testing/selftests/bpf/prog_tests/snprintf.c
@@ -19,7 +19,7 @@
#define EXP_ADDR_OUT "0000000000000000 ffff00000add4e55 "
#define EXP_ADDR_RET sizeof(EXP_ADDR_OUT "unknownhashedptr")
-#define EXP_STR_OUT "str1 longstr"
+#define EXP_STR_OUT "str1 a longstr"
#define EXP_STR_RET sizeof(EXP_STR_OUT)
#define EXP_OVER_OUT "%over"
@@ -114,6 +114,8 @@ void test_snprintf_negative(void)
ASSERT_ERR(load_single_snprintf("%"), "invalid specifier 3");
ASSERT_ERR(load_single_snprintf("%12345678"), "invalid specifier 4");
ASSERT_ERR(load_single_snprintf("%--------"), "invalid specifier 5");
+ ASSERT_ERR(load_single_snprintf("%lc"), "invalid specifier 6");
+ ASSERT_ERR(load_single_snprintf("%llc"), "invalid specifier 7");
ASSERT_ERR(load_single_snprintf("\x80"), "non ascii character");
ASSERT_ERR(load_single_snprintf("\x1"), "non printable character");
}
diff --git a/tools/testing/selftests/bpf/progs/test_snprintf.c b/tools/testing/selftests/bpf/progs/test_snprintf.c
index e2ad26150f9b..afc2c583125b 100644
--- a/tools/testing/selftests/bpf/progs/test_snprintf.c
+++ b/tools/testing/selftests/bpf/progs/test_snprintf.c
@@ -40,6 +40,7 @@ int handler(const void *ctx)
/* Convenient values to pretty-print */
const __u8 ex_ipv4[] = {127, 0, 0, 1};
const __u8 ex_ipv6[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1};
+ const __u32 chr1 = 0x64636261; /* dcba */
static const char str1[] = "str1";
static const char longstr[] = "longstr";
@@ -59,9 +60,9 @@ int handler(const void *ctx)
/* Kernel pointers */
addr_ret = BPF_SNPRINTF(addr_out, sizeof(addr_out), "%pK %px %p",
0, 0xFFFF00000ADD4E55, 0xFFFF00000ADD4E55);
- /* Strings embedding */
- str_ret = BPF_SNPRINTF(str_out, sizeof(str_out), "%s %+05s",
- str1, longstr);
+ /* Strings and single-byte character embedding */
+ str_ret = BPF_SNPRINTF(str_out, sizeof(str_out), "%s % 9c %+05s",
+ str1, chr1, longstr);
/* Overflow */
over_ret = BPF_SNPRINTF(over_out, sizeof(over_out), "%%overflow");
/* Padding of fixed width numbers */
--
2.30.2
