From: Josh Triplett <josh@joshtriplett.org>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Kees Cook <keescook@chromium.org>,
Johannes Weiner <hannes@cmpxchg.org>,
Ingo Molnar <mingo@kernel.org>, Andy Lutomirski <luto@kernel.org>,
Petr Mladek <pmladek@suse.com>,
Thomas Garnier <thgarnie@google.com>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Nicolas Pitre <nicolas.pitre@linaro.org>,
Zefan Li <lizefan@huawei.com>, Li Bin <huawei.libin@huawei.com>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Dmitry Vyukov <dvyukov@google.com>,
Ralf Baechle <ralf@linux-mips.org>,
Alex Thorlton <athorlton@sgi.com>, Michal Hocko <mhocko@suse.com>,
Mateusz Guzik <mguzik@redhat.com>,
Cyrill Gorcunov <gorcunov@openvz.org>,
John Stultz <john.stultz@linaro.org>,
Al Viro <viro@zeniv.linux.org.uk>,
Zach
Subject: Re: [PATCH 0/2] Support compiling out the prctl syscall
Date: Tue, 8 Nov 2016 19:42:09 -0800 [thread overview]
Message-ID: <20161109034209.i5ok4cy2apjp3mpk@x> (raw)
In-Reply-To: <3032452.SC5nD8WpIB@wuerfel>
On Wed, Nov 09, 2016 at 01:26:53AM +0100, Arnd Bergmann wrote:
> On Tuesday, November 8, 2016 4:17:47 PM CET Josh Triplett wrote:
> > Some embedded systems can do without the prctl syscall, saving some space.
> >
> > This also avoids regular increases in tinyconfig size as people add more
> > non-optional functionality to prctl (observed via the 0-day kernel
> > infrastructure).
> >
> > The first patch moves prctl and all its helpers into a separate source file,
> > kernel/prctl.c, to allow making it optional via the Makefile without any
> > ifdefs. The second patch adds the Kconfig option to make prctl optional.
> >
> > Josh Triplett (2):
> > kernel: Move prctl and helpers from kernel/sys.c to new kernel/prctl.c
> > kernel: Support compiling out the prctl syscall
> >
>
> Both of these look really nice to me. Another syscall that comes to
> mind as a candidate to be made optional is ptrace, and I've added
> Nicolas Pitre to Cc here, as he has looked into this before.
I've looked at that as well; it's a rather more complex patch, as
several other bits of the kernel hook into ptrace or otherwise depend on
ptrace. (And ptrace_may_access will need to stick around even when
ptrace doesn't.)
- Josh Triplett
WARNING: multiple messages have this Message-ID (diff)
From: Josh Triplett <josh@joshtriplett.org>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Kees Cook <keescook@chromium.org>,
Johannes Weiner <hannes@cmpxchg.org>,
Ingo Molnar <mingo@kernel.org>, Andy Lutomirski <luto@kernel.org>,
Petr Mladek <pmladek@suse.com>,
Thomas Garnier <thgarnie@google.com>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Nicolas Pitre <nicolas.pitre@linaro.org>,
Zefan Li <lizefan@huawei.com>, Li Bin <huawei.libin@huawei.com>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Dmitry Vyukov <dvyukov@google.com>,
Ralf Baechle <ralf@linux-mips.org>,
Alex Thorlton <athorlton@sgi.com>, Michal Hocko <mhocko@suse.com>,
Mateusz Guzik <mguzik@redhat.com>,
Cyrill Gorcunov <gorcunov@openvz.org>,
John Stultz <john.stultz@linaro.org>,
Al Viro <viro@zeniv.linux.org.uk>, Zach Brown <zab@redhat.com>,
Anna Schumaker <Anna.Schumaker@netapp.com>,
Dave Hansen <dave.hansen@intel.com>,
linux-kernel@vger.kernel.org, linux-api@vger.kernel.org,
Nicolas Pitre <nico@linaro.org>
Subject: Re: [PATCH 0/2] Support compiling out the prctl syscall
Date: Tue, 8 Nov 2016 19:42:09 -0800 [thread overview]
Message-ID: <20161109034209.i5ok4cy2apjp3mpk@x> (raw)
In-Reply-To: <3032452.SC5nD8WpIB@wuerfel>
On Wed, Nov 09, 2016 at 01:26:53AM +0100, Arnd Bergmann wrote:
> On Tuesday, November 8, 2016 4:17:47 PM CET Josh Triplett wrote:
> > Some embedded systems can do without the prctl syscall, saving some space.
> >
> > This also avoids regular increases in tinyconfig size as people add more
> > non-optional functionality to prctl (observed via the 0-day kernel
> > infrastructure).
> >
> > The first patch moves prctl and all its helpers into a separate source file,
> > kernel/prctl.c, to allow making it optional via the Makefile without any
> > ifdefs. The second patch adds the Kconfig option to make prctl optional.
> >
> > Josh Triplett (2):
> > kernel: Move prctl and helpers from kernel/sys.c to new kernel/prctl.c
> > kernel: Support compiling out the prctl syscall
> >
>
> Both of these look really nice to me. Another syscall that comes to
> mind as a candidate to be made optional is ptrace, and I've added
> Nicolas Pitre to Cc here, as he has looked into this before.
I've looked at that as well; it's a rather more complex patch, as
several other bits of the kernel hook into ptrace or otherwise depend on
ptrace. (And ptrace_may_access will need to stick around even when
ptrace doesn't.)
- Josh Triplett
next prev parent reply other threads:[~2016-11-09 3:42 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-09 0:17 [PATCH 0/2] Support compiling out the prctl syscall Josh Triplett
2016-11-09 0:17 ` Josh Triplett
[not found] ` <cover.c693f10dfc19e12c214758e4b13ca9b4e4cf9668.1478650356.git-series.josh-iaAMLnmF4UmaiuxdJuQwMA@public.gmane.org>
2016-11-09 0:18 ` [PATCH 1/2] kernel: Move prctl and helpers from kernel/sys.c to new kernel/prctl.c Josh Triplett
2016-11-09 0:18 ` Josh Triplett
[not found] ` <afb9a2bb41be9e129ececea27e09a7d69d1c5e6c.1478650356.git-series.josh-iaAMLnmF4UmaiuxdJuQwMA@public.gmane.org>
2016-11-09 0:19 ` Andy Lutomirski
2016-11-09 0:19 ` Andy Lutomirski
2016-11-09 7:02 ` Cyrill Gorcunov
2016-11-09 7:02 ` Cyrill Gorcunov
2016-11-09 0:18 ` [PATCH 2/2] kernel: Support compiling out the prctl syscall Josh Triplett
2016-11-09 0:18 ` Josh Triplett
[not found] ` <b5c45594261252a486b891090eba8f10aa7ed329.1478650356.git-series.josh-iaAMLnmF4UmaiuxdJuQwMA@public.gmane.org>
2016-11-09 0:40 ` Kees Cook
2016-11-09 0:40 ` Kees Cook
[not found] ` <CAGXu5j+V11oF0gcqBQTsBMgetsSdRqLQffobhyEbze82gbW2vA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-11-09 0:47 ` Josh Triplett
2016-11-09 0:47 ` Josh Triplett
2016-11-09 0:56 ` Kees Cook
2016-11-09 0:56 ` Kees Cook
[not found] ` <CAGXu5jK-dh0DYGp=syrJb6NQ6x_FNBc-migCj4fvBHv4yvukpA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-11-09 1:08 ` Josh Triplett
2016-11-09 1:08 ` Josh Triplett
2016-11-09 0:26 ` [PATCH 0/2] " Arnd Bergmann
2016-11-09 0:26 ` Arnd Bergmann
2016-11-09 3:42 ` Josh Triplett [this message]
2016-11-09 3:42 ` Josh Triplett
2016-11-09 0:30 ` Nicolas Pitre
2016-11-09 0:30 ` Nicolas Pitre
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