selftests/mm: Fix build with _FORTIFY_SOURCE

Add missing flags argument to open(2) call with O_CREAT.

Some tests fail to compile if _FORTIFY_SOURCE is defined (to any valid
value) (together with -O), resulting in similar error messages such as:

  In file included from /usr/include/fcntl.h:342,
                   from gup_test.c:1:
  In function 'open',
      inlined from 'main' at gup_test.c:206:10:
  /usr/include/bits/fcntl2.h:50:11: error: call to '__open_missing_mode' declared with attribute error: open with O_CREAT or O_TMPFILE in second argument needs 3 arguments
     50 |           __open_missing_mode ();
        |           ^~~~~~~~~~~~~~~~~~~~~~

_FORTIFY_SOURCE is enabled by default in some distributions, so the
tests are not built by default and are skipped.

open(2) man-page warns about missing flags argument: "if it is not
supplied, some arbitrary bytes from the stack will be applied as the
file mode."

Link: https://lkml.kernel.org/r/20240318023445.3192922-1-vt@altlinux.org
Fixes: aeb85ed4f41a ("tools/testing/selftests/vm/gup_benchmark.c: allow user specified file")
Fixes: fbe37501b252 ("mm: huge_memory: debugfs for file-backed THP split")
Fixes: c942f5bd17b3 ("selftests: soft-dirty: add test for mprotect")
Signed-off-by: Vitaly Chikunov <vt@altlinux.org>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Keith Busch <kbusch@kernel.org>
Cc: Peter Xu <peterx@redhat.com>
Cc: Yang Shi <shy828301@gmail.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Nadav Amit <nadav.amit@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/tools/testing/selftests/mm/gup_test.c b/tools/testing/selftests/mm/gup_test.c
index cbe99594d319b4156da2c48a09001d0f06e7a36f..18a49c70d4c6354baac96073bc99446ad70b0b85 100644 (file)
--- a/tools/testing/selftests/mm/gup_test.c
+++ b/tools/testing/selftests/mm/gup_test.c
@@ -203,7 +203,7 @@ int main(int argc, char **argv)
        ksft_print_header();
        ksft_set_plan(nthreads);
 
-       filed = open(file, O_RDWR|O_CREAT);
+       filed = open(file, O_RDWR|O_CREAT, 0664);
        if (filed < 0)
                ksft_exit_fail_msg("Unable to open %s: %s\n", file, strerror(errno));
 

diff --git a/tools/testing/selftests/mm/soft-dirty.c b/tools/testing/selftests/mm/soft-dirty.c
index cc5f144430d4d246fa5dfd09445b6ecc78f46a81..7dbfa53d93a05f504ea4c1019bce92677cec136d 100644 (file)
--- a/tools/testing/selftests/mm/soft-dirty.c
+++ b/tools/testing/selftests/mm/soft-dirty.c
@@ -137,7 +137,7 @@ static void test_mprotect(int pagemap_fd, int pagesize, bool anon)
                if (!map)
                        ksft_exit_fail_msg("anon mmap failed\n");
        } else {
-               test_fd = open(fname, O_RDWR | O_CREAT);
+               test_fd = open(fname, O_RDWR | O_CREAT, 0664);
                if (test_fd < 0) {
                        ksft_test_result_skip("Test %s open() file failed\n", __func__);
                        return;

diff --git a/tools/testing/selftests/mm/split_huge_page_test.c b/tools/testing/selftests/mm/split_huge_page_test.c
index 856662d2f87a1b0db004c3e4297d3e5697424d62..6c988bd2f335677b9b87af1594407e63f907e542 100644 (file)
--- a/tools/testing/selftests/mm/split_huge_page_test.c
+++ b/tools/testing/selftests/mm/split_huge_page_test.c
@@ -223,7 +223,7 @@ void split_file_backed_thp(void)
                ksft_exit_fail_msg("Fail to create file-backed THP split testing file\n");
        }
 
-       fd = open(testfile, O_CREAT|O_WRONLY);
+       fd = open(testfile, O_CREAT|O_WRONLY, 0664);
        if (fd == -1) {
                ksft_perror("Cannot open testing file");
                goto cleanup;