linux-ext4 - Re: [PATCH 3/7] syscalls/fanotify20: Validate incoming FID in FAN_FS

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Date:   Tue, 3 Aug 2021 11:56:31 +0300
From:   Amir Goldstein <amir73il@...il.com>
To:     Gabriel Krisman Bertazi <krisman@...labora.com>
Cc:     LTP List <ltp@...ts.linux.it>, Jan Kara <jack@...e.com>,
        Ext4 <linux-ext4@...r.kernel.org>,
        Khazhismel Kumykov <khazhy@...gle.com>, kernel@...labora.com
Subject: Re: [PATCH 3/7] syscalls/fanotify20: Validate incoming FID in FAN_FS_ERROR

On Tue, Aug 3, 2021 at 12:47 AM Gabriel Krisman Bertazi
<krisman@...labora.com> wrote:
>
> Verify the FID provided in the event.  If the testcase has a null inode,
> this is assumed to be a superblock error (i.e. null FH).
>
> Signed-off-by: Gabriel Krisman Bertazi <krisman@...labora.com>
> ---
>  .../kernel/syscalls/fanotify/fanotify20.c     | 51 +++++++++++++++++++
>  1 file changed, 51 insertions(+)
>
> diff --git a/testcases/kernel/syscalls/fanotify/fanotify20.c b/testcases/kernel/syscalls/fanotify/fanotify20.c
> index fd5cfb8744f1..d8d788ae685f 100644
> --- a/testcases/kernel/syscalls/fanotify/fanotify20.c
> +++ b/testcases/kernel/syscalls/fanotify/fanotify20.c
> @@ -40,6 +40,14 @@
>
>  #define FAN_EVENT_INFO_TYPE_ERROR      4
>
> +#ifndef FILEID_INVALID
> +#define        FILEID_INVALID          0xff
> +#endif
> +
> +#ifndef FILEID_INO32_GEN
> +#define FILEID_INO32_GEN       1
> +#endif
> +
>  struct fanotify_event_info_error {
>         struct fanotify_event_info_header hdr;
>         __s32 error;
> @@ -57,6 +65,9 @@ static const struct test_case {
>         char *name;
>         int error;
>         unsigned int error_count;
> +
> +       /* inode can be null for superblock errors */
> +       unsigned int *inode;

Any reason not to use fanotify_fid_t * like fanotify16.c?

Thanks,
Amir.