mailing list of musl libc
 help / color / mirror / code / Atom feed
From: "Jₑₙₛ Gustedt" <jens.gustedt@inria.fr>
To: Tamir Duberstein <tamird@google.com>
Cc: musl@lists.openwall.com, NRK <nrk@disroot.org>,
	Rich Felker <dalias@libc.org>
Subject: Re: [musl] undefined behavior in fread.c
Date: Fri, 24 Feb 2023 18:00:18 +0100	[thread overview]
Message-ID: <20230224180018.7d58ea44@inria.fr> (raw)
In-Reply-To: <CAK-_uh7KAVJOMBmJNZyn6cuFXi__TF-K6tzv=D7F3voTt_5Ujg@mail.gmail.com>

[-- Attachment #1: Type: text/plain, Size: 940 bytes --]

Tamir,

on Fri, 24 Feb 2023 11:42:30 -0500 you (Tamir Duberstein
<tamird@google.com>) wrote:

> Internal UB means "applying zero offset to null pointer" when the
> caller passes (NULL, _, 0, _).

So you mean internal misbehavior?

> Does such an attribute exist?

Yes, gcc has the nonnull old-style attribute, and I think that the C23
versions of gcc and clang will have something like `[[gnu::nonnull]]`.

Having this as attribute of the function and not of the pointer is a
bit unfortunate. For non-void pointers you could also use the `[static
1]` array parameter notation instead of a pointer.

Jₑₙₛ

-- 
:: ICube :::::::::::::::::::::::::::::: deputy director ::
:: Université de Strasbourg :::::::::::::::::::::: ICPS ::
:: INRIA Nancy Grand Est :::::::::::::::::::::::: Camus ::
:: :::::::::::::::::::::::::::::::::::: ☎ +33 368854536 ::
:: https://icube-icps.unistra.fr/index.php/Jens_Gustedt ::

[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 195 bytes --]

  reply	other threads:[~2023-02-24 17:00 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-02-24 12:52 Tamir Duberstein
2023-02-24 13:34 ` Rich Felker
2023-02-24 13:53   ` Jₑₙₛ Gustedt
2023-02-24 13:55   ` NRK
2023-02-24 14:07     ` Rich Felker
2023-02-24 14:17       ` NRK
2023-02-24 14:42         ` Tamir Duberstein
2023-02-24 15:13           ` NRK
2023-02-24 16:12             ` Tamir Duberstein
2023-02-24 16:40               ` Jₑₙₛ Gustedt
2023-02-24 16:42                 ` Tamir Duberstein
2023-02-24 17:00                   ` Jₑₙₛ Gustedt [this message]
2023-02-24 17:07                     ` enh
2023-02-24 17:32                       ` Tamir Duberstein
2023-02-24 16:42                 ` enh
2023-02-24 20:07                 ` Rich Felker

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=20230224180018.7d58ea44@inria.fr \
    --to=jens.gustedt@inria.fr \
    --cc=dalias@libc.org \
    --cc=musl@lists.openwall.com \
    --cc=nrk@disroot.org \
    --cc=tamird@google.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. 
Code repositories for project(s) associated with this public inbox

	https://git.vuxu.org/mirror/musl/

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).