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Date: Tue, 19 Oct 2021 09:13:57 +0300 From: Amir Goldstein <amir73il@...il.com> To: Gabriel Krisman Bertazi <krisman@...labora.com> Cc: Jan Kara <jack@...e.com>, "Darrick J. Wong" <djwong@...nel.org>, Theodore Tso <tytso@....edu>, Dave Chinner <david@...morbit.com>, David Howells <dhowells@...hat.com>, Khazhismel Kumykov <khazhy@...gle.com>, linux-fsdevel <linux-fsdevel@...r.kernel.org>, Ext4 <linux-ext4@...r.kernel.org>, Linux API <linux-api@...r.kernel.org>, kernel@...labora.com Subject: Re: [PATCH v8 25/32] fanotify: Report fid entry even for zero-length file_handle On Tue, Oct 19, 2021 at 3:03 AM Gabriel Krisman Bertazi <krisman@...labora.com> wrote: > > Non-inode errors will reported with an empty file_handle. In > preparation for that, allow some events to print the FID record even if > there isn't any file_handle encoded > > Even though FILEID_ROOT is used internally, make zero-length file > handles be reported as FILEID_INVALID. > > Signed-off-by: Gabriel Krisman Bertazi <krisman@...labora.com> Reviewed-by: Amir Goldstein <amir73il@...il.com> > --- > fs/notify/fanotify/fanotify_user.c | 8 +++++--- > 1 file changed, 5 insertions(+), 3 deletions(-) > > diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c > index ae848306a017..cd962deefeb7 100644 > --- a/fs/notify/fanotify/fanotify_user.c > +++ b/fs/notify/fanotify/fanotify_user.c > @@ -339,9 +339,6 @@ static int copy_fid_info_to_user(__kernel_fsid_t *fsid, struct fanotify_fh *fh, > pr_debug("%s: fh_len=%zu name_len=%zu, info_len=%zu, count=%zu\n", > __func__, fh_len, name_len, info_len, count); > > - if (!fh_len) > - return 0; > - > if (WARN_ON_ONCE(len < sizeof(info) || len > count)) > return -EFAULT; > > @@ -376,6 +373,11 @@ static int copy_fid_info_to_user(__kernel_fsid_t *fsid, struct fanotify_fh *fh, > > handle.handle_type = fh->type; > handle.handle_bytes = fh_len; > + > + /* Mangle handle_type for bad file_handle */ > + if (!fh_len) > + handle.handle_type = FILEID_INVALID; > + > if (copy_to_user(buf, &handle, sizeof(handle))) > return -EFAULT; > > -- > 2.33.0 >
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