All of lore.kernel.org
 help / color / mirror / Atom feed
From: Denis Kenzior <denkenz@gmail.com>
To: James Bottomley <jejb@linux.ibm.com>,
	ndesaulniers@google.com, dhowells@redhat.com
Cc: natechancellor@gmail.com, ebiggers@google.com,
	Mimi Zohar <zohar@linux.vnet.ibm.com>,
	James Morris <jmorris@namei.org>,
	"Serge E. Hallyn" <serge@hallyn.com>,
	linux-integrity@vger.kernel.org, keyrings@vger.kernel.org,
	linux-security-module@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] KEYS: trusted: fix -Wvarags warning
Date: Fri, 12 Oct 2018 15:13:56 +0000	[thread overview]
Message-ID: <fc23168b-7275-bae0-6039-04e261b3cbad@gmail.com> (raw)
In-Reply-To: <1539356751.2656.5.camel@linux.ibm.com>

Hi James,

>> So can't we simply use 'bool' or uint32 as the type for h3 instead
>> of re-ordering everything
> 
> The problem is the standard is ambiguious.  The only thing that's
> guaranteed to work for all time is a char *.  If you want to keep the
> order, what I'd suggest is inserting a dummy pointer argument which is
> always expected to be NULL between the h3 and the varargs.

So maybe I'm misunderstanding something, but the issue seems to be that 
unsigned char is promoted to 'unsigned char *' by Clang and probably 
unsigned int or int by gcc.

So instead of having unsigned char h3, can't we simply have bool h3 or 
unsigned int h3?

Regards,
-Denis

WARNING: multiple messages have this Message-ID (diff)
From: Denis Kenzior <denkenz@gmail.com>
To: James Bottomley <jejb@linux.ibm.com>,
	ndesaulniers@google.com, dhowells@redhat.com
Cc: natechancellor@gmail.com, ebiggers@google.com,
	Mimi Zohar <zohar@linux.vnet.ibm.com>,
	James Morris <jmorris@namei.org>,
	"Serge E. Hallyn" <serge@hallyn.com>,
	linux-integrity@vger.kernel.org, keyrings@vger.kernel.org,
	linux-security-module@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] KEYS: trusted: fix -Wvarags warning
Date: Fri, 12 Oct 2018 10:13:56 -0500	[thread overview]
Message-ID: <fc23168b-7275-bae0-6039-04e261b3cbad@gmail.com> (raw)
In-Reply-To: <1539356751.2656.5.camel@linux.ibm.com>

Hi James,

>> So can't we simply use 'bool' or uint32 as the type for h3 instead
>> of re-ordering everything
> 
> The problem is the standard is ambiguious.  The only thing that's
> guaranteed to work for all time is a char *.  If you want to keep the
> order, what I'd suggest is inserting a dummy pointer argument which is
> always expected to be NULL between the h3 and the varargs.

So maybe I'm misunderstanding something, but the issue seems to be that 
unsigned char is promoted to 'unsigned char *' by Clang and probably 
unsigned int or int by gcc.

So instead of having unsigned char h3, can't we simply have bool h3 or 
unsigned int h3?

Regards,
-Denis


  reply	other threads:[~2018-10-12 15:13 UTC|newest]

Thread overview: 68+ 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
2018-10-09 22:11 ` Nick Desaulniers
2018-10-11 16:02 ` Arnd Bergmann
2018-10-11 16:02   ` Arnd Bergmann
2018-10-11 16:10   ` James Bottomley
2018-10-11 16:10     ` James Bottomley
2018-10-11 20:31     ` [PATCH] KEYS: trusted: fix -Wvarags warning ndesaulniers
2018-10-11 20:31       ` ndesaulniers
2018-10-12  1:50       ` Nathan Chancellor
2018-10-12  1:50         ` Nathan Chancellor
2018-10-12 16:55         ` Nick Desaulniers
2018-10-12 16:55           ` Nick Desaulniers
2018-10-12 17:03           ` Nathan Chancellor
2018-10-12 17:03             ` Nathan Chancellor
2018-10-12 12:29       ` Denis Kenzior
2018-10-12 12:29         ` Denis Kenzior
2018-10-12 15:05         ` James Bottomley
2018-10-12 15:05           ` James Bottomley
2018-10-12 15:13           ` Denis Kenzior [this message]
2018-10-12 15:13             ` Denis Kenzior
2018-10-12 15:22             ` James Bottomley
2018-10-12 15:22               ` James Bottomley
2018-10-12 15:44               ` Denis Kenzior
2018-10-12 15:44                 ` Denis Kenzior
2018-10-12 15:46                 ` James Bottomley
2018-10-12 15:46                   ` James Bottomley
2018-10-12 15:53                   ` Denis Kenzior
2018-10-12 15:53                     ` Denis Kenzior
2018-10-12 16:01                     ` James Bottomley
2018-10-12 16:01                       ` James Bottomley
2018-10-12 17:14                       ` Nick Desaulniers
2018-10-12 17:14                         ` Nick Desaulniers
2018-10-12 15:25             ` James Bottomley
2018-10-12 15:25               ` James Bottomley
2018-10-12 17:05             ` Nick Desaulniers
2018-10-12 17:05               ` Nick Desaulniers
2018-10-12 17:17               ` Nick Desaulniers
2018-10-12 17:17                 ` Nick Desaulniers
2018-10-12 17:27               ` Denis Kenzior
2018-10-12 17:27                 ` Denis Kenzior
2018-10-12 18:39                 ` Nick Desaulniers
2018-10-12 18:39                   ` Nick Desaulniers
2018-10-12 17:02         ` Nick Desaulniers
2018-10-12 17:02           ` Nick Desaulniers
2018-10-12 17:15           ` Denis Kenzior
2018-10-12 17:15             ` Denis Kenzior
2018-10-15  9:26       ` David Laight
2018-10-15  9:26         ` David Laight
2018-10-15  9:26         ` David Laight
2018-10-15 21:53         ` Nick Desaulniers
2018-10-15 21:53           ` Nick Desaulniers
2018-10-16  8:13           ` David Laight
2018-10-16  8:13             ` David Laight
2018-10-16  8:13             ` David Laight
2018-10-22 23:43             ` [PATCH v2] " ndesaulniers
2018-10-22 23:43               ` ndesaulniers
2018-10-23  0:00               ` Nathan Chancellor
2018-10-23  0:00                 ` Nathan Chancellor
2018-10-24  8:36               ` Jarkko Sakkinen
2018-10-24  8:36                 ` Jarkko Sakkinen
2018-10-29 17:54                 ` Nick Desaulniers
2018-10-29 17:54                   ` Nick Desaulniers
2019-02-11 18:36                   ` Nick Desaulniers
2019-02-11 18:36                     ` Nick Desaulniers
2019-02-12 23:12                     ` Jarkko Sakkinen
2019-02-12 23:12                       ` Jarkko Sakkinen
2019-02-14 10:52                       ` Jarkko Sakkinen
2019-02-14 10:52                         ` Jarkko Sakkinen

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=fc23168b-7275-bae0-6039-04e261b3cbad@gmail.com \
    --to=denkenz@gmail.com \
    --cc=dhowells@redhat.com \
    --cc=ebiggers@google.com \
    --cc=jejb@linux.ibm.com \
    --cc=jmorris@namei.org \
    --cc=keyrings@vger.kernel.org \
    --cc=linux-integrity@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-security-module@vger.kernel.org \
    --cc=natechancellor@gmail.com \
    --cc=ndesaulniers@google.com \
    --cc=serge@hallyn.com \
    --cc=zohar@linux.vnet.ibm.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.