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From: Peter Zijlstra <peterz@infradead.org>
To: Kees Cook <keescook@chromium.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	Elena Reshetova <elena.reshetova@intel.com>,
	x86@kernel.org, Andy Lutomirski <luto@kernel.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Alexander Potapenko <glider@google.com>,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	Jann Horn <jannh@google.com>,
	"Perla, Enrico" <enrico.perla@intel.com>,
	kernel-hardening@lists.openwall.com,
	linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 1/5] jump_label: Provide CONFIG-driven build state defaults
Date: Tue, 24 Mar 2020 23:06:41 +0100	[thread overview]
Message-ID: <20200324220641.GT2452@worktop.programming.kicks-ass.net> (raw)
In-Reply-To: <20200324203231.64324-2-keescook@chromium.org>

On Tue, Mar 24, 2020 at 01:32:27PM -0700, Kees Cook wrote:
> Choosing the initial state of static branches changes the assembly
> layout (if the condition is expected to be likely, inline, or unlikely,
> out of line via a jump). A few places in the kernel use (or could be
> using) a CONFIG to choose the default state, so provide the
> infrastructure to do this and convert the existing cases (init_on_alloc
> and init_on_free) to the new macros.
> 
> Signed-off-by: Kees Cook <keescook@chromium.org>

Cute,

Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>

WARNING: multiple messages have this Message-ID (diff)
From: Peter Zijlstra <peterz@infradead.org>
To: Kees Cook <keescook@chromium.org>
Cc: Mark Rutland <mark.rutland@arm.com>, Jann Horn <jannh@google.com>,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	x86@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	Alexander Potapenko <glider@google.com>,
	linux-arm-kernel@lists.infradead.org,
	Andy Lutomirski <luto@kernel.org>,
	kernel-hardening@lists.openwall.com, "Perla,
	Enrico" <enrico.perla@intel.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Will Deacon <will@kernel.org>,
	Elena Reshetova <elena.reshetova@intel.com>
Subject: Re: [PATCH v2 1/5] jump_label: Provide CONFIG-driven build state defaults
Date: Tue, 24 Mar 2020 23:06:41 +0100	[thread overview]
Message-ID: <20200324220641.GT2452@worktop.programming.kicks-ass.net> (raw)
In-Reply-To: <20200324203231.64324-2-keescook@chromium.org>

On Tue, Mar 24, 2020 at 01:32:27PM -0700, Kees Cook wrote:
> Choosing the initial state of static branches changes the assembly
> layout (if the condition is expected to be likely, inline, or unlikely,
> out of line via a jump). A few places in the kernel use (or could be
> using) a CONFIG to choose the default state, so provide the
> infrastructure to do this and convert the existing cases (init_on_alloc
> and init_on_free) to the new macros.
> 
> Signed-off-by: Kees Cook <keescook@chromium.org>

Cute,

Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>

_______________________________________________
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linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  reply	other threads:[~2020-03-24 22:07 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-24 20:32 [PATCH v2 0/5] Optionally randomize kernel stack offset each syscall Kees Cook
2020-03-24 20:32 ` Kees Cook
2020-03-24 20:32 ` [PATCH v2 1/5] jump_label: Provide CONFIG-driven build state defaults Kees Cook
2020-03-24 20:32   ` Kees Cook
2020-03-24 22:06   ` Peter Zijlstra [this message]
2020-03-24 22:06     ` Peter Zijlstra
2020-03-24 20:32 ` [PATCH v2 2/5] init_on_alloc: Unpessimize default-on builds Kees Cook
2020-03-24 20:32   ` Kees Cook
2020-03-26 15:48   ` Alexander Potapenko
2020-03-26 15:48     ` Alexander Potapenko
2020-03-24 20:32 ` [PATCH v2 3/5] stack: Optionally randomize kernel stack offset each syscall Kees Cook
2020-03-24 20:32   ` Kees Cook
2020-03-30 11:25   ` Mark Rutland
2020-03-30 11:25     ` Mark Rutland
2020-03-30 18:18     ` Kees Cook
2020-03-30 18:18       ` Kees Cook
2020-03-30 18:27     ` Kees Cook
2020-03-30 18:27       ` Kees Cook
2020-03-24 20:32 ` [PATCH v2 4/5] x86/entry: Enable random_kstack_offset support Kees Cook
2020-03-24 20:32   ` Kees Cook
2020-03-28 22:26   ` Kees Cook
2020-03-28 22:26     ` Kees Cook
2020-03-24 20:32 ` [PATCH v2 5/5] arm64: entry: " Kees Cook
2020-03-24 20:32   ` Kees Cook
2020-03-25 13:21   ` Mark Rutland
2020-03-25 13:21     ` Mark Rutland
2020-03-25 20:22     ` Kees Cook
2020-03-25 20:22       ` Kees Cook
2020-03-26 11:15       ` Mark Rutland
2020-03-26 11:15         ` Mark Rutland
2020-03-26 16:31         ` Kees Cook
2020-03-26 16:31           ` Kees Cook
2020-03-30 11:26           ` Mark Rutland
2020-03-30 11:26             ` Mark Rutland
2020-04-20 20:54   ` Will Deacon
2020-04-20 20:54     ` Will Deacon
2020-04-20 22:34     ` Kees Cook
2020-04-20 22:34       ` Kees Cook
2020-04-21  7:02       ` Will Deacon
2020-04-21  7:02         ` Will Deacon
2020-03-24 21:28 ` [PATCH v2 0/5] Optionally randomize kernel stack offset each syscall Jann Horn
2020-03-24 21:28   ` Jann Horn
2020-03-24 23:07   ` Kees Cook
2020-03-24 23:07     ` Kees Cook
2020-03-25 12:15     ` Reshetova, Elena
2020-03-25 12:15       ` Reshetova, Elena
2020-03-25 20:27       ` Kees Cook
2020-03-25 20:27         ` Kees Cook
2020-03-25 23:20         ` Jann Horn
2020-03-25 23:20           ` Jann Horn
2020-03-26 17:18           ` Kees Cook
2020-03-26 17:18             ` Kees Cook

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