linux-kernel - Re: [RFC v3 36/45] NFSv4: Fix GETATTR bitmap verification

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Message-ID: <CAHpGcMLQGc4HUZEDRKAv2yaH7wwSBBO_jrMA6+=AQ6hb=WrNUg@mail.gmail.com>
Date:	Fri, 29 May 2015 00:09:38 +0200
From:	Andreas Grünbacher <andreas.gruenbacher@...il.com>
To:	Trond Myklebust <trond.myklebust@...marydata.com>
Cc:	"J. Bruce Fields" <bfields@...ldses.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux FS-devel Mailing List <linux-fsdevel@...r.kernel.org>,
	Linux NFS Mailing List <linux-nfs@...r.kernel.org>
Subject: Re: [RFC v3 36/45] NFSv4: Fix GETATTR bitmap verification

2015-05-28 23:55 GMT+02:00 Trond Myklebust <trond.myklebust@...marydata.com>:
>> We already do this kind of check with the existing code. What's wrong with it?
>
> Actually, you're right, we don't check for the previous word, however
> fixing that is a question of adding 2 extra checks in
> decode_getfattr_attrs(), one in decode_getfattr_statfs(), and one in
> decode_fsinfo().
>
> It shouldn't require a rewrite of the entire nfs4xdr.c.

I would actually prefer either verifying the reply bitmap against the
request bitmap,
or checking the bitmap first as this patch does --- the current
approach of knocking
individual bits over and checking if any "before" bits have been missed isn't
exactly what I would take as a textbook example.

Thanks,
Andreas
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