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From: Nick Desaulniers <ndesaulniers@google.com>
To: denkenz@gmail.com
Cc: "James E.J. Bottomley" <jejb@linux.vnet.ibm.com>,
	dhowells@redhat.com, Nathan Chancellor <natechancellor@gmail.com>,
	Eric Biggers <ebiggers@google.com>,
	zohar@linux.vnet.ibm.com, jmorris@namei.org, serge@hallyn.com,
	linux-integrity@vger.kernel.org, keyrings@vger.kernel.org,
	linux-security-module@vger.kernel.org,
	LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] KEYS: trusted: fix -Wvarags warning
Date: Fri, 12 Oct 2018 10:02:39 -0700
Message-ID: <CAKwvOdmHm_2i6bQa59hw1K1ZoTzdSx9yfNoR66WLr_UCv0Lr1w@mail.gmail.com> (raw)
In-Reply-To: <f83893d2-ed9b-613f-2768-1a975d28fe8b@gmail.com>

On Fri, Oct 12, 2018 at 5:29 AM Denis Kenzior <denkenz@gmail.com> wrote:
>
> Hi Nick,
>
> > @@ -123,7 +123,7 @@ static int TSS_rawhmac(unsigned char *digest, const unsigned char *key,
> >    */
> >   static int TSS_authhmac(unsigned char *digest, const unsigned char *key,
> >                       unsigned int keylen, unsigned char *h1,
> > -                     unsigned char *h2, unsigned char h3, ...)
> > +                     unsigned char h2, unsigned char *h3, ...)
> >   {
> >       unsigned char paramdigest[SHA1_DIGEST_SIZE];
> >       struct sdesc *sdesc;
>
> So my concern here is that this actually breaks the natural argument
> order compared to what the specification uses.  This in turn requires
> one to perform some mental gymnastics and I'm not sure that this is such
> a good idea.

Thanks for the review.

> Refer to
> https://trustedcomputinggroup.org/wp-content/uploads/TPM-Main-Part-3-Commands_v1.2_rev116_01032011.pdf
> for details.

 Can you cite the relevant section?

>
> Note that H3 is really the 'continueAuthSession' variable which is a
> bool.  In the above specification BOOL has a size of 1, and TSS_authhmac
> already assigns a h3 to 'c' which is used for the actual hashing.
>
> So can't we simply use 'bool' or uint32 as the type for h3 instead of
> re-ordering everything?

int was exactly what I originally proposed:
https://github.com/ClangBuiltLinux/linux/issues/41#issuecomment-428365339.
If that works for you and the maintainers, I can send that in patch
form.

>
> Regards,
> -Denis



-- 
Thanks,
~Nick Desaulniers

  parent reply index

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-09 22:11 undefined behavior (-Wvarargs) in security/keys/trusted.c#TSS_authhmac() Nick Desaulniers
2018-10-11 16:02 ` Arnd Bergmann
2018-10-11 16:10   ` James Bottomley
2018-10-11 20:31     ` [PATCH] KEYS: trusted: fix -Wvarags warning ndesaulniers
2018-10-12  1:50       ` Nathan Chancellor
2018-10-12 16:55         ` Nick Desaulniers
2018-10-12 17:03           ` Nathan Chancellor
2018-10-12 12:29       ` Denis Kenzior
2018-10-12 15:05         ` James Bottomley
2018-10-12 15:13           ` Denis Kenzior
2018-10-12 15:22             ` James Bottomley
2018-10-12 15:44               ` Denis Kenzior
2018-10-12 15:46                 ` James Bottomley
2018-10-12 15:53                   ` Denis Kenzior
2018-10-12 16:01                     ` James Bottomley
2018-10-12 17:14                       ` Nick Desaulniers
2018-10-12 15:25             ` James Bottomley
2018-10-12 17:05             ` Nick Desaulniers
2018-10-12 17:17               ` Nick Desaulniers
2018-10-12 17:27               ` Denis Kenzior
2018-10-12 18:39                 ` Nick Desaulniers
2018-10-12 17:02         ` Nick Desaulniers [this message]
2018-10-12 17:15           ` Denis Kenzior
2018-10-15  9:26       ` David Laight
2018-10-15  9:26         ` David Laight
2018-10-15 21:53         ` Nick Desaulniers
2018-10-16  8:13           ` David Laight
2018-10-16  8:13             ` David Laight
2018-10-22 23:43             ` [PATCH v2] " ndesaulniers
2018-10-23  0:00               ` Nathan Chancellor
2018-10-24  8:36               ` Jarkko Sakkinen
2018-10-29 17:54                 ` Nick Desaulniers
2019-02-11 18:36                   ` Nick Desaulniers
2019-02-12 23:12                     ` Jarkko Sakkinen
2019-02-14 10:52                       ` Jarkko Sakkinen

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