linux-kernel - Re: [PATCH v3 0/6] Tracing vs CR2

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Message-ID: <CALCETrVH_F-OVQOsJ=KRGtNLQfM5QpSzP4UNn2RbLjP4ueeq-g@mail.gmail.com>
Date:   Thu, 18 Jul 2019 13:27:23 -0700
From:   Andy Lutomirski <luto@...nel.org>
To:     Eiichi Tsukata <devel@...ukata.com>
Cc:     Vegard Nossum <vegard.nossum@...cle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Andrew Lutomirski <luto@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux_lkml_grp@...cle.com, "H. Peter Anvin" <hpa@...or.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Juergen Gross <jgross@...e.com>,
        LKML <linux-kernel@...r.kernel.org>,
        He Zhe <zhe.he@...driver.com>,
        Joel Fernandes <joel@...lfernandes.org>
Subject: Re: [PATCH v3 0/6] Tracing vs CR2

Hi all-

I suspect that a bunch of the bugs you're all finding boil down to:

 - Nested debug exceptions could corrupt the outer exception's DR6.
 - Nested debug exceptions in which *both* exceptions came from the
kernel were probably all kinds of buggy
 - Data breakpoints in bad places in the kernel were bad news

Could you give this not-quite-finished series a try?

https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git/