On Sun, Feb 19, 2017 at 4:27 AM, Al Viro <viro@xxxxxxxxxxxxxxxxxx> wrote:
> On Mon, Jan 16, 2017 at 08:47:32PM +0100, Miklos Szeredi wrote:
>
>> > + umode_t mode, int open_flag)
>> > +{
>> > + static const struct qstr name = QSTR_INIT("/", 1);
>> > + struct dentry *child = NULL;
>> > + struct inode *inode;
>> > + int error;
>> > +
>> > + /* we want directory to be writable */
>> > + error = inode_permission(dir, MAY_WRITE | MAY_EXEC);
>>
>> This is not in the scope of this patch, but shoudln't we be using
>> may_create() here? Or at least a variant without the audit thing...
>>
>> Al?
>
> may_create() expects directory + child dentry; here we have only parent.
> IS_DEADDIR is rather pointless here - directory is not locked, for
> starters, so rmdir might happen right under you. Or right after you've
> returned from your function, for that matter. userns checks...
> FWIW, no such checks are done in ->atomic_open() paths, so I'm not sure
> how much are those worth...
Eric would know since he added those checks.
Thanks,
Miklos
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