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From: Joe Perches <joe@perches.com>
To: Emese Revfy <re.emese@gmail.com>,
	kernel-hardening@lists.openwall.com,
	Matt Davis <mattdavis9@gmail.com>
Cc: pageexec@freemail.hu, spender@grsecurity.net, mmarek@suse.com,
	keescook@chromium.org, linux-kernel@vger.kernel.org,
	yamada.masahiro@socionext.com, linux-kbuild@vger.kernel.org,
	minipli@ld-linux.so, linux@armlinux.org.uk,
	catalin.marinas@arm.com, linux@rasmusvillemoes.dk,
	david.brown@linaro.org, benh@kernel.crashing.org,
	tglx@linutronix.de, akpm@linux-foundation.org,
	jlayton@poochiereds.net, arnd@arndb.de
Subject: Re: [PATCH v1 0/2] Introduce the initify gcc plugin
Date: Tue, 28 Jun 2016 14:49:15 -0700	[thread overview]
Message-ID: <1467150555.24287.77.camel@perches.com> (raw)
In-Reply-To: <20160628133407.10c2ea1ecd194e8085e84c5a@gmail.com>

On Tue, 2016-06-28 at 13:34 +0200, Emese Revfy wrote:
> I would like to introduce the initify gcc plugin. The kernel already has
> a mechanism to free up code and data memory that is only used during kernel
> or module initialization.
> This plugin will teach the compiler to find more such code and data that
> can be freed after initialization. It reduces memory usage.
> The initify gcc plugin can be useful for embedded systems.

Another potentially useful plugin, especially for embedded systems,
would be to compress any string literal marked with

	 __attribute__((format(printf, string-index,)))

and decompress the compressed format on the stack in lib/vsprintf.c
vsnprintf just before use.

I've started to experiment with that.

WARNING: multiple messages have this Message-ID (diff)
From: Joe Perches <joe@perches.com>
To: Emese Revfy <re.emese@gmail.com>,
	kernel-hardening@lists.openwall.com,
	Matt Davis <mattdavis9@gmail.com>
Cc: pageexec@freemail.hu, spender@grsecurity.net, mmarek@suse.com,
	keescook@chromium.org, linux-kernel@vger.kernel.org,
	yamada.masahiro@socionext.com, linux-kbuild@vger.kernel.org,
	minipli@ld-linux.so, linux@armlinux.org.uk,
	catalin.marinas@arm.com, linux@rasmusvillemoes.dk,
	david.brown@linaro.org, benh@kernel.crashing.org,
	tglx@linutronix.de, akpm@linux-foundation.org,
	jlayton@poochiereds.net, arnd@arndb.de
Subject: [kernel-hardening] Re: [PATCH v1 0/2] Introduce the initify gcc plugin
Date: Tue, 28 Jun 2016 14:49:15 -0700	[thread overview]
Message-ID: <1467150555.24287.77.camel@perches.com> (raw)
In-Reply-To: <20160628133407.10c2ea1ecd194e8085e84c5a@gmail.com>

On Tue, 2016-06-28 at 13:34 +0200, Emese Revfy wrote:
> I would like to introduce the initify gcc plugin. The kernel already has
> a mechanism to free up code and data memory that is only used during kernel
> or module initialization.
> This plugin will teach the compiler to find more such code and data that
> can be freed after initialization. It reduces memory usage.
> The initify gcc plugin can be useful for embedded systems.

Another potentially useful plugin, especially for embedded systems,
would be to compress any string literal marked with

	 __attribute__((format(printf, string-index,)))

and decompress the compressed format on the stack in lib/vsprintf.c
vsnprintf just before use.

I've started to experiment with that.

  parent reply	other threads:[~2016-06-28 21:50 UTC|newest]

Thread overview: 61+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-06-28 11:34 [PATCH v1 0/2] Introduce the initify gcc plugin Emese Revfy
2016-06-28 11:34 ` [kernel-hardening] " Emese Revfy
2016-06-28 11:35 ` [PATCH v1 1/2] Add " Emese Revfy
2016-06-28 11:35   ` [kernel-hardening] " Emese Revfy
2016-06-28 21:05   ` Rasmus Villemoes
2016-06-28 21:05     ` [kernel-hardening] " Rasmus Villemoes
2016-06-29 14:50     ` Kees Cook
2016-06-29 14:50       ` [kernel-hardening] " Kees Cook
2016-06-29 14:50       ` Kees Cook
2016-06-29 19:03     ` Emese Revfy
2016-06-29 19:03       ` [kernel-hardening] " Emese Revfy
2016-06-28 11:36 ` [PATCH v1 2/2] Mark functions with the __nocapture attribute Emese Revfy
2016-06-28 11:36   ` [kernel-hardening] " Emese Revfy
2016-06-28 16:43   ` Joe Perches
2016-06-28 16:43     ` [kernel-hardening] " Joe Perches
2016-06-28 20:40     ` Emese Revfy
2016-06-28 20:40       ` [kernel-hardening] " Emese Revfy
2016-06-28 21:00       ` Joe Perches
2016-06-28 21:00         ` [kernel-hardening] " Joe Perches
2016-06-29 18:42         ` Emese Revfy
2016-06-29 18:42           ` [kernel-hardening] " Emese Revfy
2016-06-30  0:12           ` Joe Perches
2016-06-30  0:12             ` [kernel-hardening] " Joe Perches
2016-07-01 14:03             ` Emese Revfy
2016-07-01 14:03               ` [kernel-hardening] " Emese Revfy
2016-06-28 20:50   ` Rasmus Villemoes
2016-06-28 20:50     ` [kernel-hardening] " Rasmus Villemoes
2016-06-28 21:38     ` PaX Team
2016-06-28 21:38       ` [kernel-hardening] " PaX Team
2016-06-28 22:41       ` Rasmus Villemoes
2016-06-28 22:41         ` [kernel-hardening] " Rasmus Villemoes
2016-06-29 18:39     ` Emese Revfy
2016-06-29 18:39       ` [kernel-hardening] " Emese Revfy
2016-06-28 11:42 ` [PATCH v1 0/2] Introduce the initify gcc plugin Emese Revfy
2016-06-28 11:42   ` [kernel-hardening] " Emese Revfy
2016-06-28 12:57 ` [kernel-hardening] " Mark Rutland
2016-06-28 16:14   ` Emese Revfy
2016-06-28 20:46     ` Kees Cook
2016-06-28 20:46       ` Kees Cook
2016-06-29  8:21       ` Mark Rutland
2016-06-29  8:21         ` Mark Rutland
2016-06-29 17:52         ` Mark Rutland
2016-06-29 17:52           ` Mark Rutland
2016-06-29 18:28           ` Emese Revfy
2016-06-29 18:28             ` Emese Revfy
2016-06-28 16:35 ` Joe Perches
2016-06-28 16:35   ` [kernel-hardening] " Joe Perches
2016-06-28 18:48   ` Joe Perches
2016-06-28 18:48     ` [kernel-hardening] " Joe Perches
2016-06-28 19:02     ` Rasmus Villemoes
2016-06-28 19:02       ` [kernel-hardening] " Rasmus Villemoes
2016-06-28 20:29       ` Emese Revfy
2016-06-28 20:29         ` [kernel-hardening] " Emese Revfy
2016-06-28 17:00 ` Mathias Krause
2016-06-28 17:00   ` [kernel-hardening] " Mathias Krause
2016-06-28 20:29   ` Emese Revfy
2016-06-28 20:29     ` [kernel-hardening] " Emese Revfy
2016-06-28 21:49 ` Joe Perches [this message]
2016-06-28 21:49   ` Joe Perches
2016-06-28 22:07   ` Valdis.Kletnieks
2016-06-28 23:54     ` Joe Perches

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