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Message-ID: <20170510021118.GA390@ZenIV.linux.org.uk>
Date: Wed, 10 May 2017 03:11:18 +0100
From: Al Viro <viro@...IV.linux.org.uk>
To: Christoph Hellwig <hch@...radead.org>
Cc: Andy Lutomirski <luto@...nel.org>, Ingo Molnar <mingo@...nel.org>,
Greg KH <greg@...ah.com>, Thomas Garnier <thgarnie@...gle.com>,
Martin Schwidefsky <schwidefsky@...ibm.com>,
Heiko Carstens <heiko.carstens@...ibm.com>,
Dave Hansen <dave.hansen@...el.com>, Arnd Bergmann <arnd@...db.de>,
Thomas Gleixner <tglx@...utronix.de>,
David Howells <dhowells@...hat.com>,
René Nyffenegger <mail@...enyffenegger.ch>,
Andrew Morton <akpm@...ux-foundation.org>,
"Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
"Eric W . Biederman" <ebiederm@...ssion.com>,
Oleg Nesterov <oleg@...hat.com>,
Pavel Tikhomirov <ptikhomirov@...tuozzo.com>,
Ingo Molnar <mingo@...hat.com>, "H . Peter Anvin" <hpa@...or.com>,
Paolo Bonzini <pbonzini@...hat.com>, Rik van Riel <riel@...hat.com>,
Kees Cook <keescook@...omium.org>,
Josh Poimboeuf <jpoimboe@...hat.com>,
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"Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
Christian Borntraeger <borntraeger@...ibm.com>,
Russell King <linux@...linux.org.uk>,
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the arch/x86 maintainers <x86@...nel.org>,
"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>,
Kernel Hardening <kernel-hardening@...ts.openwall.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: Re: [PATCH v9 1/4] syscalls: Verify address
limit before returning to user-mode
On Tue, May 09, 2017 at 09:03:22AM -0700, Christoph Hellwig wrote:
> On Tue, May 09, 2017 at 06:02:50AM -0700, Christoph Hellwig wrote:
> > On Tue, May 09, 2017 at 06:00:01AM -0700, Andy Lutomirski wrote:
> > > fs/splice.c has some, ahem, interesting uses that have been the source
> > > of nasty exploits in the past. Converting them to use iov_iter
> > > properly would be really, really nice. Christoph, I don't suppose
> > > you'd like to do that?
> >
> > I can take care of all the fs code including this one.
Oh?
> I spent the afternoon hacking up where I'd like this to head. It's
> completely untested as of now:
>
> http://git.infradead.org/users/hch/vfs.git/shortlog/refs/heads/setfs-elimination
And just what happens to driver that has no ->read_iter()? Unless I'm
seriously misreading that, NAK with extreme prejudice.
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