linux-kernel - Re: [PATCH 3.12 69/72] Revert "fix minor infoleak in get_user

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Message-ID: <20161108103657.GA10689@kroah.com>
Date:   Tue, 8 Nov 2016 11:36:57 +0100
From:   Greg KH <greg@...ah.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Jiri Slaby <jslaby@...e.cz>, stable <stable@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH 3.12 69/72] Revert "fix minor infoleak in get_user_ex()"

On Mon, Nov 07, 2016 at 08:45:59AM -0800, Linus Torvalds wrote:
> So a patch something like this might be a safe way to fix the
> potential infoleak in older kernels.
> 
> THIS IS UNTESTED. It's a very obvious patch, though, so if it compiles
> it probably works. It just initializes the output variable with 0 in
> the inline asm description, instead of doing it in the exception
> handler.
> 
> It will generate slightly worse code (a few unnecessary ALU
> operations), but it doesn't have any interactions with the exception
> handler implementation.

It builds here, so I've queued it up for 4.4-stable, let's see if
the auto-builders have any problems with it.  Thanks for the patch.

greg k-h