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From: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
To: Nick Desaulniers <ndesaulniers@google.com>
Cc: "James E.J. Bottomley" <jejb@linux.vnet.ibm.com>,
	zohar@linux.vnet.ibm.com, David Howells <dhowells@redhat.com>,
	Nathan Chancellor <natechancellor@gmail.com>,
	David.Laight@aculab.com, denkenz@gmail.com, jmorris@namei.org,
	serge@hallyn.com, keyrings@vger.kernel.org,
	LKML <linux-kernel@vger.kernel.org>,
	linux-integrity@vger.kernel.org,
	linux-security-module@vger.kernel.org
Subject: Re: [PATCH v2] [PATCH] KEYS: trusted: fix -Wvarags warning
Date: Wed, 13 Feb 2019 01:12:56 +0200
Message-ID: <20190212231256.GD3977@linux.intel.com> (raw)
In-Reply-To: <CAKwvOdnhDin6TJfBVxm6xsCh_nJeBuA7GqbgJwgLnqc3PrJGxA@mail.gmail.com>

On Mon, Feb 11, 2019 at 10:36:51AM -0800, Nick Desaulniers wrote:
> On Mon, Oct 29, 2018 at 10:54 AM Nick Desaulniers
> <ndesaulniers@google.com> wrote:
> >
> > On Wed, Oct 24, 2018 at 1:37 AM Jarkko Sakkinen
> > <jarkko.sakkinen@linux.intel.com> wrote:
> > >
> > > On Mon, 22 Oct 2018, ndesaulniers@google.com wrote:
> > > > Fixes the warning reported by Clang:
> > > > security/keys/trusted.c:146:17: warning: passing an object that
> > > > undergoes default
> > > >      argument promotion to 'va_start' has undefined behavior [-Wvarargs]
> > > >        va_start(argp, h3);
> > > >                       ^
> > > > security/keys/trusted.c:126:37: note: parameter of type 'unsigned
> > > > char' is declared here
> > > > unsigned char *h2, unsigned char h3, ...)
> > > >                               ^
> > > > Specifically, it seems that both the C90 (4.8.1.1) and C11 (7.16.1.4)
> > > > standards explicitly call this out as undefined behavior:
> > > >
> > > > The parameter parmN is the identifier of the rightmost parameter in
> > > > the variable parameter list in the function definition (the one just
> > > > before the ...). If the parameter parmN is declared with ... or with a
> > > > type that is not compatible with the type that results after
> > > > application of the default argument promotions, the behavior is
> > > > undefined.
> > > >
> > > > Link: https://github.com/ClangBuiltLinux/linux/issues/41
> > > > Link: https://www.eskimo.com/~scs/cclass/int/sx11c.html
> > > > Suggested-by: David Laight <David.Laight@aculab.com>
> > > > Suggested-by: Denis Kenzior <denkenz@gmail.com>
> > > > Suggested-by: James Bottomley <jejb@linux.vnet.ibm.com>
> > > > Suggested-by: Nathan Chancellor <natechancellor@gmail.com>
> > > > Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
> > >
> > > Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> > >
> > > /Jarkko
> >
> > Bumping the maintainers if this isn't already picked up?
> 
> James, Jarkko, or Mimi, can you please pick this up (and let me know
> what tree it lands in)?

I can volunteer. Have not done yet v5.1 PR so it would land to that
release. Is this agreed?

/Jarkko

  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
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 [this message]
2019-02-14 10:52                       ` Jarkko Sakkinen

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