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From: Rabin Vincent <rabin@rab.in>
To: Kees Cook <keescook@chromium.org>
Cc: Will Deacon <will.deacon@arm.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Rob Herring <robh@kernel.org>,
	Laura Abbott <lauraa@codeaurora.org>,
	Leif Lindholm <leif.lindholm@linaro.org>,
	Stephen Boyd <sboyd@codeaurora.org>,
	"msalter@redhat.com" <msalter@redhat.com>,
	Liu hua <sdu.liu@huawei.com>,
	Nikolay Borisov <Nikolay.Borisov@arm.com>,
	Nicolas Pitre <nicolas.pitre@linaro.org>,
	Tomasz Figa <t.figa@samsung.com>,
	Doug Anderson <dianders@google.com>,
	Jason Wessel <jason.wessel@windriver.com>,
	Catalin Marinas <Catalin.Marinas@arm.com>,
	Russell King - ARM Linux <linux@arm.linux.org.uk>,
	"linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>,
	"linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>
Subject: Re: [PATCH v4 7/8] ARM: mm: allow non-text sections to be non-executable
Date: Sun, 31 Aug 2014 16:59:21 +0200	[thread overview]
Message-ID: <20140831145921.GA4931@dator> (raw)
In-Reply-To: <CAGXu5j+OnpaZAJRsSsR=iid8178p+4hR5xzrJ7N3F94DZ7DYMg@mail.gmail.com>

On Fri, Aug 29, 2014 at 09:04:41AM -0700, Kees Cook wrote:
> On Tue, Aug 26, 2014 at 7:43 AM, Will Deacon <will.deacon@arm.com> wrote:
> > Hmm, so do you mandate that preemption is disabled during sections of code
> > where the permissions must be changed after boot? (e.g. ftrace patching)
> 
> I guess it's not enforced (how do I make sure preempt is off?), but
> it's only used during the ftrace patching. I'm open to suggestions! (I
> had avoided going the fixmap route since I would have expected that to
> be much slower.)

For ftrace patching this is called under stop_machine() so preemption is
already off there.

WARNING: multiple messages have this Message-ID (diff)
From: rabin@rab.in (Rabin Vincent)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v4 7/8] ARM: mm: allow non-text sections to be non-executable
Date: Sun, 31 Aug 2014 16:59:21 +0200	[thread overview]
Message-ID: <20140831145921.GA4931@dator> (raw)
In-Reply-To: <CAGXu5j+OnpaZAJRsSsR=iid8178p+4hR5xzrJ7N3F94DZ7DYMg@mail.gmail.com>

On Fri, Aug 29, 2014 at 09:04:41AM -0700, Kees Cook wrote:
> On Tue, Aug 26, 2014 at 7:43 AM, Will Deacon <will.deacon@arm.com> wrote:
> > Hmm, so do you mandate that preemption is disabled during sections of code
> > where the permissions must be changed after boot? (e.g. ftrace patching)
> 
> I guess it's not enforced (how do I make sure preempt is off?), but
> it's only used during the ftrace patching. I'm open to suggestions! (I
> had avoided going the fixmap route since I would have expected that to
> be much slower.)

For ftrace patching this is called under stop_machine() so preemption is
already off there.

  reply	other threads:[~2014-08-31 14:59 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-08-13 17:06 [PATCH v4 0/8] arm: support CONFIG_RODATA Kees Cook
2014-08-13 17:06 ` Kees Cook
2014-08-13 17:06 ` [PATCH v4 1/8] arm: use generic fixmap.h Kees Cook
2014-08-13 17:06   ` Kees Cook
2014-08-13 17:06 ` [PATCH v4 2/8] ARM: expand fixmap region to 3MB Kees Cook
2014-08-13 17:06   ` Kees Cook
2014-08-19 12:26   ` Will Deacon
2014-08-19 12:26     ` Will Deacon
2014-08-20 12:16     ` Kees Cook
2014-08-20 12:16       ` Kees Cook
2014-08-26 14:37       ` Will Deacon
2014-08-26 14:37         ` Will Deacon
2014-08-13 17:06 ` [PATCH v4 3/8] arm: fixmap: implement __set_fixmap() Kees Cook
2014-08-13 17:06   ` Kees Cook
2014-08-13 17:06 ` [PATCH v4 4/8] arm: use fixmap for text patching when text is RO Kees Cook
2014-08-13 17:06   ` Kees Cook
2014-08-19 12:29   ` Will Deacon
2014-08-19 12:29     ` Will Deacon
2014-08-20 12:28     ` Kees Cook
2014-08-20 12:28       ` Kees Cook
2014-09-03 21:43       ` Kees Cook
2014-09-03 21:43         ` Kees Cook
2014-09-04  9:27         ` Will Deacon
2014-09-04  9:27           ` Will Deacon
2014-09-04 14:00           ` Kees Cook
2014-09-04 14:00             ` Kees Cook
2014-09-04 14:06             ` Will Deacon
2014-09-04 14:06               ` Will Deacon
2014-08-13 17:06 ` [PATCH v4 5/8] ARM: kexec: Make .text R/W in machine_kexec Kees Cook
2014-08-13 17:06   ` Kees Cook
2014-08-13 17:06 ` [PATCH v4 6/8] arm: kgdb: Handle read-only text / modules Kees Cook
2014-08-13 17:06   ` Kees Cook
2014-08-13 17:06 ` [PATCH v4 7/8] ARM: mm: allow non-text sections to be non-executable Kees Cook
2014-08-13 17:06   ` Kees Cook
2014-08-19 12:33   ` Will Deacon
2014-08-19 12:33     ` Will Deacon
2014-08-20 12:37     ` Kees Cook
2014-08-20 12:37       ` Kees Cook
2014-08-26 14:43       ` Will Deacon
2014-08-26 14:43         ` Will Deacon
2014-08-29 16:04         ` Kees Cook
2014-08-29 16:04           ` Kees Cook
2014-08-31 14:59           ` Rabin Vincent [this message]
2014-08-31 14:59             ` Rabin Vincent
2014-08-13 17:06 ` [PATCH v4 8/8] ARM: mm: allow text and rodata sections to be read-only Kees Cook
2014-08-13 17:06   ` Kees Cook
2014-08-19 12:36   ` Will Deacon
2014-08-19 12:36     ` Will Deacon
2014-08-20 12:52     ` Kees Cook
2014-08-20 12:52       ` Kees Cook
2014-08-13 17:38 ` [PATCH v4 0/8] arm: support CONFIG_RODATA Nicolas Pitre
2014-08-13 17:38   ` Nicolas Pitre

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