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From: Will Deacon <will@kernel.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Andy Lutomirski <luto@kernel.org>,
	Gabriel Krisman Bertazi <krisman@collabora.com>,
	LKML <linux-kernel@vger.kernel.org>,
	kernel@collabora.com, Matthew Wilcox <willy@infradead.org>,
	Paul Gofman <gofmanp@gmail.com>,
	Kees Cook <keescook@chromium.org>,
	"open list:KERNEL SELFTEST FRAMEWORK" 
	<linux-kselftest@vger.kernel.org>, Shuah Khan <shuah@kernel.org>
Subject: Re: [PATCH v4 1/2] kernel: Implement selective syscall userspace redirection
Date: Mon, 20 Jul 2020 10:44:38 +0100	[thread overview]
Message-ID: <20200720094437.GA11405@willie-the-truck> (raw)
In-Reply-To: <874kq2o7zy.fsf@nanos.tec.linutronix.de>

On Mon, Jul 20, 2020 at 11:23:13AM +0200, Thomas Gleixner wrote:
> Andy Lutomirski <luto@kernel.org> writes:
> > On Thu, Jul 16, 2020 at 12:31 PM Gabriel Krisman Bertazi
> > <krisman@collabora.com> wrote:
> > The amount of syscall entry wiring that arches need to do is IMO
> > already a bit out of hand.  Should we instead rename TIF_SECCOMP to
> > TIF_SYSCALL_INTERCEPTION and have one generic callback that handles
> > seccomp and this new thing?
> 
> The right way to go is to consolidate all the stupidly different
> entry/exit work handling implementations and have exactly one in generic
> code, i.e. what I posted a few days ago.
> 
> Then we can make new features only available in the generic version by
> hiding the new functionality in the core code and not exposing the
> functions to architecture implementations.
> 
> Making it easy for architectures to keep their own variant forever just
> proliferates the mess we have right now.

Couldn't agree more. We recently added PTRACE_SYSEMU to arm64 and I deeply
regret doing that now that yet another way to rewrite the syscall number
has come along. I only just untangled some of the mess in our entry code
for that, so I can't say I'm looking forward to opening it right back up
to support this new feature. Much better to do it in the core code instead.

Will

  reply	other threads:[~2020-07-20  9:44 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-16 19:31 [PATCH v4 0/2] Syscall User Redirection Gabriel Krisman Bertazi
2020-07-16 19:31 ` [PATCH v4 1/2] kernel: Implement selective syscall userspace redirection Gabriel Krisman Bertazi
2020-07-16 21:06   ` Matthew Wilcox
2020-07-16 21:26     ` Kees Cook
2020-07-17  0:20   ` Andy Lutomirski
2020-07-17  2:15     ` Gabriel Krisman Bertazi
2020-07-17  4:48       ` Andy Lutomirski
2020-07-21 12:06         ` Mark Rutland
2020-07-20  9:23     ` Thomas Gleixner
2020-07-20  9:44       ` Will Deacon [this message]
2020-07-20 10:08   ` Thomas Gleixner
2020-07-20 13:46     ` Gabriel Krisman Bertazi
2020-07-16 19:31 ` [PATCH v4 2/2] selftests: Add kselftest for syscall user dispatch Gabriel Krisman Bertazi
2020-07-16 20:04 ` [PATCH v4 0/2] Syscall User Redirection Kees Cook
2020-07-16 20:22   ` Christian Brauner
2020-07-16 20:25     ` Kees Cook
2020-07-16 20:29       ` Christian Brauner
2020-07-16 20:30         ` Gabriel Krisman Bertazi
2020-07-16 21:06           ` Carlos O'Donell
2020-08-02 12:01 ` Pavel Machek
2020-08-04 14:26   ` Gabriel Krisman Bertazi

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