linux-kernel - Re: [PATCH v2] x86/syscalls: Mark expected switch fall-throughs

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Date:   Thu, 28 Mar 2019 01:20:14 +0300
From:   "Dmitry V. Levin" <ldv@...linux.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Oleg Nesterov <oleg@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Andy Lutomirski <luto@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [PATCH v2] x86/syscalls: Mark expected switch fall-throughs

On Wed, Mar 27, 2019 at 03:29:16PM +0100, Thomas Gleixner wrote:
> On Wed, 27 Mar 2019, Dmitry V. Levin wrote:
> > On Tue, Mar 26, 2019 at 04:12:45PM +0100, Oleg Nesterov wrote:
> > > On 03/23, Thomas Gleixner wrote:
> > [...]
> > > >  2) syscall_set_arguments() has been introduced in 2008 and we still have
> > > >     no caller. Instead of polishing it, can it be removed completely or are
> > > >     there plans to actually use it?
> > > 
> > > I think it can die.
> > 
> > When PTRACE_GET_SYSCALL_INFO is finally squeezed into the kernel,
> > we could discuss adding PTRACE_SET_SYSCALL_INFO as well, and it
> > will need syscall_set_arguments().
> 
> So if that ever happens, then adding the code back isn't rocket
> science. But if not, then there is no point in carrying the dead horse
> around another 11 years.

Given that it took me roughly 4 months to get a relatively simple revert
of commit 5e937a9ae913 accepted into linux-next, adding the code back
might be time-consuming.

Could we delay the removal of syscall_set_arguments() until
PTRACE_GET_SYSCALL_INFO is merged into the kernel?
I hope it won't take another 11 years.


-- 
ldv

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