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Date: Wed, 17 Jan 2018 11:54:12 -0800
From: Dan Williams <>
To: Al Viro <>
Cc: Alan Cox <>, Linus Torvalds <>, 
	Linux Kernel Mailing List <>,, 
	Andi Kleen <>, Kees Cook <>,, 
	Greg Kroah-Hartman <>, "the arch/x86 maintainers" <>, 
	Ingo Molnar <>, "H. Peter Anvin" <>, Thomas Gleixner <>, 
	Andrew Morton <>
Subject: Re: [PATCH v3 8/9] x86: use __uaccess_begin_nospec and ASM_IFENCE in
 get_user paths

On Wed, Jan 17, 2018 at 10:52 AM, Al Viro <> wrote:
> On Wed, Jan 17, 2018 at 02:17:26PM +0000, Alan Cox wrote:
>         Incidentally, what about copy_to_iter() and friends?  They
> check iov_iter flavour and go either into the "copy to kernel buffer"
> or "copy to userland" paths.  Do we need to deal with mispredictions
> there?  We are calling a bunch of those on read()...

Those should be protected by the conversion of __uaccess_begin to
__uaccess_begin_nospec that includes the lfence.

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