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Message-ID: <CAGXu5jJpeh5Ark4QG-UMUUkr-d+hWoBBb5eYzoGOCFXnW3xgkw@mail.gmail.com>
Date: Tue, 26 Feb 2019 15:40:34 -0800
From: Kees Cook <keescook@...omium.org>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: Peter Zijlstra <peterz@...radead.org>, Jann Horn <jannh@...gle.com>,
Sean Christopherson <sean.j.christopherson@...el.com>,
Dominik Brodowski <linux@...inikbrodowski.net>,
Kernel Hardening <kernel-hardening@...ts.openwall.com>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] lkdtm: Check for SMEP clearing protections
On Tue, Feb 26, 2019 at 3:37 PM Kees Cook <keescook@...omium.org> wrote:
> + for (i = 0; i < 64; i++) {
> ...
> + }
> + if (i >= 256) {
> + pr_info("ok: cannot locate cr4 writing call gadget\n");
> + return;
> + }
*brown paper bag*
Argh. I changed the depth of that search at the last moment and now
it's mismatched. *sigh* I will send a v2 for this with it fixed.
--
Kees Cook
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