On 6/6/23 12:16 PM, John Hubbard wrote:
> The uffd tests generate two compile time warnings from clang's
> -Wformat-security setting. These trigger at the call sites for
> uffd_test_start() and uffd_test_skip().
>
> 1) Fix the uffd_test_start() issue by removing the intermediate
> test_name variable (thanks to David Hildenbrand for showing how to do
> this).
>
> 2) Fix the uffd_test_skip() issue by observing that there is no need for
> a macro and a variable args approach, because all callers of
> uffd_test_skip() pass in a simple char* string, without any format
> specifiers. So just change uffd_test_skip() into a regular C function.
>
> Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
> Reviewed-by: Peter Xu <peterx@xxxxxxxxxx>
> Signed-off-by: John Hubbard <jhubbard@xxxxxxxxxx>
Tested-by: Muhammad Usama Anjum <usama.anjum@xxxxxxxxxxxxx>
> ---
> tools/testing/selftests/mm/uffd-unit-tests.c | 16 ++++++----------
> 1 file changed, 6 insertions(+), 10 deletions(-)
>
> diff --git a/tools/testing/selftests/mm/uffd-unit-tests.c b/tools/testing/selftests/mm/uffd-unit-tests.c
> index 269c86768a02..04d91f144d1c 100644
> --- a/tools/testing/selftests/mm/uffd-unit-tests.c
> +++ b/tools/testing/selftests/mm/uffd-unit-tests.c
> @@ -109,12 +109,11 @@ static void uffd_test_pass(void)
> ksft_inc_fail_cnt(); \
> } while (0)
>
> -#define uffd_test_skip(...) do { \
> - printf("skipped [reason: "); \
> - printf(__VA_ARGS__); \
> - printf("]\n"); \
> - ksft_inc_xskip_cnt(); \
> - } while (0)
> +static void uffd_test_skip(const char *message)
> +{
> + printf("skipped [reason: %s]\n", message);
> + ksft_inc_xskip_cnt();
> +}
>
> /*
> * Returns 1 if specific userfaultfd supported, 0 otherwise. Note, we'll
> @@ -1149,7 +1148,6 @@ int main(int argc, char *argv[])
> uffd_test_case_t *test;
> mem_type_t *mem_type;
> uffd_test_args_t args;
> - char test_name[128];
> const char *errmsg;
> int has_uffd, opt;
> int i, j;
> @@ -1192,10 +1190,8 @@ int main(int argc, char *argv[])
> mem_type = &mem_types[j];
> if (!(test->mem_targets & mem_type->mem_flag))
> continue;
> - snprintf(test_name, sizeof(test_name),
> - "%s on %s", test->name, mem_type->name);
>
> - uffd_test_start(test_name);
> + uffd_test_start("%s on %s", test->name, mem_type->name);
> if (!uffd_feature_supported(test)) {
> uffd_test_skip("feature missing");
> continue;
--
BR,
Muhammad Usama Anjum
