linux-kernel - Re: [RFC][PATCH] x86: Verify access

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Message-ID: <alpine.DEB.2.20.1701162211570.3923@nanos>
Date:   Mon, 16 Jan 2017 22:14:31 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     David Smith <dsmith@...hat.com>
cc:     Peter Zijlstra <peterz@...radead.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andy Lutomirski <luto@...capital.net>,
        Ingo Molnar <mingo@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Frank Ch. Eigler" <fche@...hat.com>
Subject: Re: [RFC][PATCH] x86: Verify access_ok() context

On Mon, 16 Jan 2017, David Smith wrote:

> If you call access_ok() with page faulting disabled, you'll still see
> this new warning.

And how so? It's just checking for task context. page fault disable/enable
has absolutely nothing to do with that.

> If you put that new access_ok() call in a module that gets
> loaded/unloaded, you see one warning for every module load, which gets a
> bit annoying.

Can you please elaborate where this access_ok() is placed in the module
code?

Thanks,

	tglx