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From: Alexander Popov <alex.popov@linux.com>
To: Ingo Molnar <mingo@kernel.org>, Kees Cook <keescook@chromium.org>
Cc: "Linus Torvalds" <torvalds@linux-foundation.org>,
	"Kernel Hardening" <kernel-hardening@lists.openwall.com>,
	"Pax Team" <pageexec@freemail.hu>,
	"Brad Spengler" <spender@grsecurity.net>,
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	"Laura Abbott" <labbott@redhat.com>,
	"Mark Rutland" <mark.rutland@arm.com>,
	"Ard Biesheuvel" <ard.biesheuvel@linaro.org>,
	"Borislav Petkov" <bp@alien8.de>,
	"Richard Sandiford" <richard.sandiford@arm.com>,
	"Thomas Gleixner" <tglx@linutronix.de>,
	"Peter Anvin" <hpa@zytor.com>,
	"Peter Zijlstra" <a.p.zijlstra@chello.nl>,
	"Dmitry V. Levin" <ldv@altlinux.org>,
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	"Jonathan Corbet" <corbet@lwn.net>,
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	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
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	"Alexei Starovoitov" <ast@kernel.org>,
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	dingtianhong <dingtianhong@huawei.com>,
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	"Dave Hansen" <dave.hansen@linux.intel.com>,
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	"Kyle Huey" <me@kylehuey.com>,
	"Dmitry Safonov" <dsafonov@virtuozzo.com>,
	"Will Deacon" <will.deacon@arm.com>,
	"Arnd Bergmann" <arnd@arndb.de>,
	"Florian Weimer" <fweimer@redhat.com>,
	"Boris Lukashev" <blukashev@sempervictus.com>,
	"Andrey Konovalov" <andreyknvl@google.com>,
	"the arch/x86 maintainers" <x86@kernel.org>,
	"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v14 0/6] Introduce the STACKLEAK feature and a test for it
Date: Fri, 13 Jul 2018 00:22:59 +0300	[thread overview]
Message-ID: <50c690fc-c967-8376-8524-ac9c1be722bc@linux.com> (raw)
In-Reply-To: <20180712205016.GA20649@gmail.com>

Hello Ingo,

On 12.07.2018 23:50, Ingo Molnar wrote:
> Let's make sure informed users have an easy runtime way out
> from the worst of the overhead that doesn't involve "recompile your distro 
> kernel". Also, make it easier to measure and fingerpoint the overhead...

Would you like the following solution?

I'll create the CONFIG_STACKLEAK_RUNTIME_DISABLE config option, which would be
similar to CONFIG_SECURITY_SELINUX_DISABLE. That option will provide a sysctl
switch disabling stackleak_erase(), which provides the most of performance penalty.

I can design this as a 7th patch in this series.

Best regards,
Alexander

  reply	other threads:[~2018-07-12 21:22 UTC|newest]

Thread overview: 72+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-07-11 20:36 [PATCH v14 0/6] Introduce the STACKLEAK feature and a test for it Alexander Popov
2018-07-11 20:36 ` [PATCH v14 1/6] gcc-plugins: Clean up the cgraph_create_edge* macros Alexander Popov
2018-07-11 20:36 ` [PATCH v14 2/6] x86/entry: Add STACKLEAK erasing the kernel stack at the end of syscalls Alexander Popov
2018-07-11 20:36 ` [PATCH v14 3/6] gcc-plugins: Add STACKLEAK plugin for tracking the kernel stack Alexander Popov
2018-07-11 20:36 ` [PATCH v14 4/6] lkdtm: Add a test for STACKLEAK Alexander Popov
2018-07-11 20:36 ` [PATCH v14 5/6] fs/proc: Show STACKLEAK metrics in the /proc file system Alexander Popov
2018-07-11 20:36 ` [PATCH v14 6/6] doc: self-protection: Add information about STACKLEAK feature Alexander Popov
2018-07-11 20:53 ` [PATCH v14 0/6] Introduce the STACKLEAK feature and a test for it Linus Torvalds
2018-07-12 13:59   ` Ingo Molnar
2018-07-12 17:45     ` Kees Cook
2018-07-12 20:50       ` Ingo Molnar
2018-07-12 21:22         ` Alexander Popov [this message]
2018-07-12 21:32           ` Kees Cook
2018-07-12 21:37             ` Alexander Popov
2018-07-15 22:44             ` Ingo Molnar
2018-07-16  7:24               ` Alexander Popov
2018-07-16 10:13                 ` Ingo Molnar
2018-07-16 17:48                   ` Alexander Popov
2018-07-17  7:12                     ` Ingo Molnar
2018-07-17 19:58                       ` Kees Cook
2018-07-17 20:45                         ` Ingo Molnar
2018-07-19 11:31                       ` [PATCH v14 7/7] stackleak, sysctl: Allow runtime disabling of kernel stack erasing Alexander Popov
2018-07-24 22:56                         ` Kees Cook
2018-07-24 23:41                           ` Alexander Popov
2018-07-24 23:59                             ` Kees Cook
2018-07-26 10:18                               ` Alexander Popov
2018-07-26 11:11                                 ` [PATCH v14 7/7] stackleak: " Alexander Popov
2018-07-26 16:08                                   ` Kees Cook
2018-07-18 21:10 ` [PATCH 0/2] Stackleak for arm64 Laura Abbott
2018-07-18 21:10   ` Laura Abbott
2018-07-18 21:10   ` [PATCH 1/2] arm64: Introduce current_stack_type Laura Abbott
2018-07-18 21:10     ` Laura Abbott
2018-07-19 11:07     ` Mark Rutland
2018-07-19 11:07       ` Mark Rutland
2018-07-18 21:10   ` [PATCH 2/2] arm64: Clear the stack Laura Abbott
2018-07-18 21:10     ` Laura Abbott
2018-07-19  2:20     ` Kees Cook
2018-07-19  2:20       ` Kees Cook
2018-07-19 10:41     ` Alexander Popov
2018-07-19 10:41       ` Alexander Popov
2018-07-19 11:41     ` Mark Rutland
2018-07-19 11:41       ` Mark Rutland
2018-07-19 23:28 ` [PATCHv2 0/2] Stackleak for arm64 Laura Abbott
2018-07-19 23:28   ` Laura Abbott
2018-07-19 23:28   ` [PATCHv2 1/2] arm64: Add stack information to on_accessible_stack Laura Abbott
2018-07-19 23:28     ` Laura Abbott
2018-07-20  6:38     ` Mark Rutland
2018-07-20  6:38       ` Mark Rutland
2018-07-19 23:28   ` [PATCHv2 2/2] arm64: Clear the stack Laura Abbott
2018-07-19 23:28     ` Laura Abbott
2018-07-20  4:33     ` Kees Cook
2018-07-20  4:33       ` Kees Cook
2018-07-20  6:39     ` Mark Rutland
2018-07-20  6:39       ` Mark Rutland
2018-07-20 21:41 ` [PATCHv3 0/2] Stackleak for arm64 Laura Abbott
2018-07-20 21:41   ` Laura Abbott
2018-07-20 21:41   ` [PATCHv3 1/2] arm64: Add stack information to on_accessible_stack Laura Abbott
2018-07-20 21:41     ` Laura Abbott
2018-07-20 21:41   ` [PATCHv3 2/2] arm64: Add support for STACKLEAK gcc plugin Laura Abbott
2018-07-20 21:41     ` Laura Abbott
2018-07-24 12:44     ` Alexander Popov
2018-07-24 12:44       ` Alexander Popov
2018-07-24 16:35       ` Kees Cook
2018-07-24 16:35         ` Kees Cook
2018-07-24 16:38   ` [PATCHv3 0/2] Stackleak for arm64 Will Deacon
2018-07-24 16:38     ` Will Deacon
2018-07-25 11:49     ` Will Deacon
2018-07-25 11:49       ` Will Deacon
2018-07-25 22:05       ` Laura Abbott
2018-07-25 22:05         ` Laura Abbott
2018-07-26  9:55         ` Will Deacon
2018-07-26  9:55           ` Will Deacon

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