Re: [PATCH 0/8] Security: Provide unioned file support

From: Miklos Szeredi
Date: Fri Jun 19 2015 - 04:36:17 EST

On Fri, Jun 19, 2015 at 10:29 AM, Al Viro <viro@xxxxxxxxxxxxxxxxxx> wrote:
> Directory, probably?
>> - dentry = lookup_one_len(name, parent->dentry, namelen);
>> + dentry = lookup_one_len(name, parent, namelen);
> ... it would better be one.

My point is: without a bloody accessor, there's no way to warn if the
use is illegal (i.e. nondirectory).

Maybe we won't need file->f_dentry, but we do need a way to WARN about
abuse (which there IS probably a significant number already and
nothing preventing more).

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