Amir Goldstein <amir73il@xxxxxxxxx> writes:
> On Tue, Aug 3, 2021 at 12:47 AM Gabriel Krisman Bertazi
> <krisman@xxxxxxxxxxxxx> wrote:
>>
>> This test corrupts an inode entry with an invalid mode through debugfs
>> and then tries to access it. This should result in a ext4 error, which
>> we monitor through the fanotify group.
>>
>> Signed-off-by: Gabriel Krisman Bertazi <krisman@xxxxxxxxxxxxx>
>> ---
>> .../kernel/syscalls/fanotify/fanotify20.c | 38 +++++++++++++++++++
>> 1 file changed, 38 insertions(+)
>>
>> diff --git a/testcases/kernel/syscalls/fanotify/fanotify20.c b/testcases/kernel/syscalls/fanotify/fanotify20.c
>> index e7ced28eb61d..0c63e90edc3a 100644
>> --- a/testcases/kernel/syscalls/fanotify/fanotify20.c
>> +++ b/testcases/kernel/syscalls/fanotify/fanotify20.c
>> @@ -76,6 +76,36 @@ static void trigger_fs_abort(void)
>> MS_REMOUNT|MS_RDONLY, "abort");
>> }
>>
>> +#define TCASE2_BASEDIR "tcase2"
>> +#define TCASE2_BAD_DIR TCASE2_BASEDIR"/bad_dir"
>> +
>> +static unsigned int tcase2_bad_ino;
>> +static void tcase2_prepare_fs(void)
>> +{
>> + struct stat stat;
>> +
>> + SAFE_MKDIR(MOUNT_PATH"/"TCASE2_BASEDIR, 0777);
>> + SAFE_MKDIR(MOUNT_PATH"/"TCASE2_BAD_DIR, 0777);
>> +
>> + SAFE_STAT(MOUNT_PATH"/"TCASE2_BAD_DIR, &stat);
>> + tcase2_bad_ino = stat.st_ino;
>> +
>> + SAFE_UMOUNT(MOUNT_PATH);
>> + do_debugfs_request(tst_device->dev, "sif " TCASE2_BAD_DIR " mode 0xff");
>> + SAFE_MOUNT(tst_device->dev, MOUNT_PATH, tst_device->fs_type, 0, NULL);
>> +}
>> +
>> +static void tcase2_trigger_lookup(void)
>> +{
>> + int ret;
>> +
>> + /* SAFE_OPEN cannot be used here because we expect it to fail. */
>> + ret = open(MOUNT_PATH"/"TCASE2_BAD_DIR, O_RDONLY, 0);
>> + if (ret != -1 && errno != EUCLEAN)
>> + tst_res(TFAIL, "Unexpected lookup result(%d) of %s (%d!=%d)",
>> + ret, TCASE2_BAD_DIR, errno, EUCLEAN);
>> +}
>> +
>> static const struct test_case {
>> char *name;
>> int error;
>> @@ -92,6 +122,14 @@ static const struct test_case {
>> .error_count = 1,
>> .error = EXT4_ERR_ESHUTDOWN,
>> .inode = NULL
>> + },
>> + {
>> + .name = "Lookup of inode with invalid mode",
>> + .prepare_fs = tcase2_prepare_fs,
>> + .trigger_error = &tcase2_trigger_lookup,
>> + .error_count = 1,
>> + .error = 0,
>> + .inode = &tcase2_bad_ino,
>
> Why is error 0?
> What's the rationale?
Hi Amir,
That is specific to Ext4. Some ext4 conditions report bogus error codes. I will
come up with a kernel patch changing it.
--
Gabriel Krisman Bertazi
