linux-kernel - Re: Have RESOLVE_* flags superseded AT

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20200302150459.zu3eo5so66vrji4w@yavin>
Date:   Tue, 3 Mar 2020 02:04:59 +1100
From:   Aleksa Sarai <cyphar@...har.com>
To:     David Howells <dhowells@...hat.com>
Cc:     Florian Weimer <fweimer@...hat.com>,
        Christian Brauner <christian.brauner@...ntu.com>,
        linux-api@...r.kernel.org, viro@...iv.linux.org.uk,
        metze@...ba.org, torvalds@...ux-foundation.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Have RESOLVE_* flags superseded AT_* flags for new syscalls?

On 2020-03-02, David Howells <dhowells@...hat.com> wrote:
> Florian Weimer <fweimer@...hat.com> wrote:
> 
> > Regarding open flags, I think the key point for future APIs is to avoid
> > using the set of flags for both control of the operation itself
> > (O_NOFOLLOW/AT_SYMLINK_NOFOLLOW, O_NOCTTY) and properaties of the
> > resulting descriptor (O_RDWR, O_SYNC).  I expect that doing that would
> > help code that has to re-create an equivalent descriptor.  The operation
> > flags are largely irrelevant to that if you can get the descriptor by
> > other means.
> 
> It would also be nice to sort out the problem with O_CLOEXEC.  That can have a
> different value, depending on the arch - so it excludes at least three bits
> from the O_* flag set.

Not to mention there are (at least?) three or four different values for
_CLOEXEC for different syscalls...

-- 
Aleksa Sarai
Senior Software Engineer (Containers)
SUSE Linux GmbH
<https://www.cyphar.com/>

Download attachment "signature.asc" of type "application/pgp-signature" (229 bytes)