linux-kernel - Re: [PATCH] seccomp: remove unused arg from secure

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Message-ID: <201909231650.1CCAFBA6@keescook>
Date:   Mon, 23 Sep 2019 16:51:32 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Andy Lutomirski <luto@...nel.org>,
        Christian Brauner <christian.brauner@...ntu.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Will Drewry <wad@...omium.org>,
        Oleg Nesterov <oleg@...hat.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Parisc List <linux-parisc@...r.kernel.org>,
        linux-s390 <linux-s390@...r.kernel.org>,
        linux-um@...ts.infradead.org, X86 ML <x86@...nel.org>
Subject: Re: [PATCH] seccomp: remove unused arg from secure_computing()

On Mon, Sep 23, 2019 at 09:34:46PM +0200, Borislav Petkov wrote:
> On Mon, Sep 23, 2019 at 11:41:59AM -0700, Andy Lutomirski wrote:
> > On Mon, Sep 23, 2019 at 2:49 AM Borislav Petkov <bp@...en8.de> wrote:
> > >
> > > On Fri, Sep 20, 2019 at 03:19:09PM +0200, Christian Brauner wrote:
> > > > While touching seccomp code I realized that the struct seccomp_data
> > > > argument to secure_computing() seems to be unused by all current
> > > > callers. So let's remove it unless there is some subtlety I missed.
> > > > Note, I only tested this on x86.
> > >
> > > What was amluto thinking in
> > >
> > > 2f275de5d1ed ("seccomp: Add a seccomp_data parameter secure_computing()")
> > 
> > IIRC there was a period of time in which x86 used secure_computing()
> > for normal syscalls, and it was a good deal faster to have the arch
> > code supply seccomp_data.  x86 no longer works like this, and syscalls
> > aren't fast anymore ayway :(
> 
> Uhuh, thanks Andy.
> 
> Christian, pls add that piece of history to the commit message.

Yeah, this is just left-over from the "two phase" seccomp optimization
that was removed a while back. I'll take this clean up into the seccomp
tree. Thanks!

-- 
Kees Cook