linux-kernel - Re: [PATCH] x86/asm/memcpy_mcsafe: Fix copy_to_user

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Date:   Wed, 4 Jul 2018 23:38:25 +0100
From:   Al Viro <viro@...IV.linux.org.uk>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Dan Williams <dan.j.williams@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Lutomirski <luto@...capital.net>,
        Borislav Petkov <bp@...en8.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tony Luck <tony.luck@...el.com>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        x86@...nel.org
Subject: Re: [PATCH] x86/asm/memcpy_mcsafe: Fix copy_to_user_mcsafe()
 exception handling

On Tue, Jul 03, 2018 at 10:30:40AM +0200, Ingo Molnar wrote:
> 
> * Dan Williams <dan.j.williams@...el.com> wrote:
> 
> > Hi Ingo,
> > 
> > Here is an additional copy_to_iter_mcsafe() fix to address the crash
> > reported by Ross. This now passes xfstests:generic/323 on my system.
> 
> The lib/iov_iter fix would need an Acked-by from Al.

I can live with that; I would really like to see some documentation on
the copy_to_iter_mcsafe(), but that's a separate story.  Incidentally,
are there any expectations of other callers appearing, or is that
(and copy_from_iter_flushcache()) YASingleConsumerAPI?