linux-kernel - Re: [RFC][PATCHSET] iov

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: <YL3mxdEc7uw4rhjn@infradead.org>
Date:   Mon, 7 Jun 2021 10:28:37 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Al Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        David Sterba <dsterba@...e.com>,
        Miklos Szeredi <miklos@...redi.hu>,
        Anton Altaparmakov <anton@...era.com>,
        David Howells <dhowells@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        Pavel Begunkov <asml.silence@...il.com>
Subject: Re: [RFC][PATCHSET] iov_iter work

On Sun, Jun 06, 2021 at 03:46:37PM -0700, Linus Torvalds wrote:
> And yes, I realize that 'uaccess_kernel()' is hopefully always false
> on any architectures we care about and so the compiler would just pick
> one at compile time rather than actually having both those
> initializers.
> 
> But I think that "the uaccess_kernel() KVEC case is legacy for
> architectures that haven't converted to the new world order yet" thing
> is just even more of an argument for not duplicating and writing the
> code out in full on a source level (and making that normal case be
> ".iov = iov").

It can't even happen for the legacy architectures, given that the
remaining set_fs() areas are small and never do iov_iter based I/O.