From: Jeff Xu <jeffxu@xxxxxxxxxx> commit 366617a69e60610912836570546f118006ebc7cb upstream. overlayfs may be disabled in the kernel configuration, causing related tests to fail. Check that overlayfs is supported at runtime, so we can skip layout2_overlay.* accordingly. Signed-off-by: Jeff Xu <jeffxu@xxxxxxxxxx> Reviewed-by: Guenter Roeck <groeck@xxxxxxxxxxxx> Cc: stable@xxxxxxxxxxxxxxx Link: https://lore.kernel.org/r/20230113053229.1281774-2-jeffxu@xxxxxxxxxx [mic: Reword comments and constify variables] Signed-off-by: Mickaël Salaün <mic@xxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- tools/testing/selftests/landlock/fs_test.c | 47 +++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) --- a/tools/testing/selftests/landlock/fs_test.c +++ b/tools/testing/selftests/landlock/fs_test.c @@ -11,6 +11,7 @@ #include <fcntl.h> #include <linux/landlock.h> #include <sched.h> +#include <stdio.h> #include <string.h> #include <sys/capability.h> #include <sys/mount.h> @@ -87,6 +88,40 @@ static const char dir_s3d3[] = TMP_DIR " * └── s3d3 */ +static bool fgrep(FILE *const inf, const char *const str) +{ + char line[32]; + const int slen = strlen(str); + + while (!feof(inf)) { + if (!fgets(line, sizeof(line), inf)) + break; + if (strncmp(line, str, slen)) + continue; + + return true; + } + + return false; +} + +static bool supports_overlayfs(void) +{ + bool res; + FILE *const inf = fopen("/proc/filesystems", "r"); + + /* + * Consider that the filesystem is supported if we cannot get the + * supported ones. + */ + if (!inf) + return true; + + res = fgrep(inf, "nodev\toverlay\n"); + fclose(inf); + return res; +} + static void mkdir_parents(struct __test_metadata *const _metadata, const char *const path) { @@ -3539,6 +3574,9 @@ FIXTURE(layout2_overlay) {}; FIXTURE_SETUP(layout2_overlay) { + if (!supports_overlayfs()) + SKIP(return, "overlayfs is not supported"); + prepare_layout(_metadata); create_directory(_metadata, LOWER_BASE); @@ -3575,6 +3613,9 @@ FIXTURE_SETUP(layout2_overlay) FIXTURE_TEARDOWN(layout2_overlay) { + if (!supports_overlayfs()) + SKIP(return, "overlayfs is not supported"); + EXPECT_EQ(0, remove_path(lower_do1_fl3)); EXPECT_EQ(0, remove_path(lower_dl1_fl2)); EXPECT_EQ(0, remove_path(lower_fl1)); @@ -3606,6 +3647,9 @@ FIXTURE_TEARDOWN(layout2_overlay) TEST_F_FORK(layout2_overlay, no_restriction) { + if (!supports_overlayfs()) + SKIP(return, "overlayfs is not supported"); + ASSERT_EQ(0, test_open(lower_fl1, O_RDONLY)); ASSERT_EQ(0, test_open(lower_dl1, O_RDONLY)); ASSERT_EQ(0, test_open(lower_dl1_fl2, O_RDONLY)); @@ -3769,6 +3813,9 @@ TEST_F_FORK(layout2_overlay, same_conten size_t i; const char *path_entry; + if (!supports_overlayfs()) + SKIP(return, "overlayfs is not supported"); + /* Sets rules on base directories (i.e. outside overlay scope). */ ruleset_fd = create_ruleset(_metadata, ACCESS_RW, layer1_base); ASSERT_LE(0, ruleset_fd);
