linux-kernel - Re: [PATCH 00/20] objtool: UACCESS validation v3

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Message-ID: <CAHk-=wgCnFm9HNEwQW3bG-7v1KtKfuUvq4-rfFwN122U8F61Gg@mail.gmail.com>
Date:   Thu, 7 Mar 2019 08:31:16 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>, Peter Anvin <hpa@...or.com>,
        Julien Thierry <julien.thierry@....com>,
        Will Deacon <will.deacon@....com>,
        Andy Lutomirski <luto@...capital.net>,
        Ingo Molnar <mingo@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        James Morse <james.morse@....com>, valentin.schneider@....com,
        Brian Gerst <brgerst@...il.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Andrew Lutomirski <luto@...nel.org>,
        Borislav Petkov <bp@...en8.de>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH 00/20] objtool: UACCESS validation v3

On Thu, Mar 7, 2019 at 4:03 AM Peter Zijlstra <peterz@...radead.org> wrote:
>
> Take for instance this one (.config attached); it has both
> CONFIG_PROFILE_ALL_BRANCHES=y and CONFIG_TRACE_BRANCH_PROFILING=y
> and it compiles:

How about just turning off SMAP checking for the really odd cases?

At some point it's not worth worrying about excessive debug
infrastructure, I think. Just give up and say "ok. we'll save/restore
in preempt_schedule()".

Or just make preempt_schedule() check AC and not schedule. It already
does that for IF.

                   Linus