linux-kernel - Re: [PATCH 16/18] arm64: kprobes: fix kprobes without CONFIG

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Message-ID: <201910210905.7494C5C@keescook>
Date:   Mon, 21 Oct 2019 09:06:58 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:     Sami Tolvanen <samitolvanen@...gle.com>,
        Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Dave Martin <Dave.Martin@....com>,
        Laura Abbott <labbott@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Kernel Hardening <kernel-hardening@...ts.openwall.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 16/18] arm64: kprobes: fix kprobes without
 CONFIG_KRETPROBES

On Mon, Oct 21, 2019 at 08:21:48AM +0200, Ard Biesheuvel wrote:
> On Fri, 18 Oct 2019 at 18:11, Sami Tolvanen <samitolvanen@...gle.com> wrote:
> >
> > This allows CONFIG_KRETPROBES to be disabled without disabling
> > kprobes entirely.
> >
> > Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>
> 
> Can we make kretprobes work with the shadow call stack instead?

I've been viewing that as "next steps". This series is the first step:
actually gaining the feature and clearly indicating where future
improvements can live.

-- 
Kees Cook