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From: Kees Cook <keescook@chromium.org>
To: Mark Brown <broonie@kernel.org>
Cc: "Catalin Marinas" <catalin.marinas@arm.com>,
	"Will Deacon" <will@kernel.org>,
	"Alexander Viro" <viro@zeniv.linux.org.uk>,
	"Paul Elliott" <paul.elliott@arm.com>,
	"Peter Zijlstra" <peterz@infradead.org>,
	"Yu-cheng Yu" <yu-cheng.yu@intel.com>,
	"Amit Kachhap" <amit.kachhap@arm.com>,
	"Vincenzo Frascino" <vincenzo.frascino@arm.com>,
	"Marc Zyngier" <maz@kernel.org>,
	"Eugene Syromiatnikov" <esyr@redhat.com>,
	"Szabolcs Nagy" <szabolcs.nagy@arm.com>,
	"H . J . Lu " <hjl.tools@gmail.com>,
	"Andrew Jones" <drjones@redhat.com>,
	"Arnd Bergmann" <arnd@arndb.de>, "Jann Horn" <jannh@google.com>,
	"Richard Henderson" <richard.henderson@linaro.org>,
	"Kristina Martšenko" <kristina.martsenko@arm.com>,
	"Thomas Gleixner" <tglx@linutronix.de>,
	"Florian Weimer" <fweimer@redhat.com>,
	"Sudakshina Das" <sudi.das@arm.com>,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
	linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH v7 11/11] arm64: mm: Display guarded pages in ptdump
Date: Wed, 26 Feb 2020 13:38:53 -0800
Message-ID: <202002261338.9890367C@keescook> (raw)
In-Reply-To: <20200226155714.43937-12-broonie@kernel.org>

On Wed, Feb 26, 2020 at 03:57:14PM +0000, Mark Brown wrote:
> v8.5-BTI introduces the GP field in stage 1 translation tables which
> indicates that blocks and pages with it set are guarded pages for which
> branch target identification checks should be performed. Decode this
> when dumping the page tables to aid debugging.
> 
> Signed-off-by: Mark Brown <broonie@kernel.org>

Reviewed-by: Kees Cook <keescook@chromium.org>

-Kees

> ---
>  arch/arm64/mm/dump.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/arch/arm64/mm/dump.c b/arch/arm64/mm/dump.c
> index 860c00ec8bd3..78163b7a7dde 100644
> --- a/arch/arm64/mm/dump.c
> +++ b/arch/arm64/mm/dump.c
> @@ -145,6 +145,11 @@ static const struct prot_bits pte_bits[] = {
>  		.val	= PTE_UXN,
>  		.set	= "UXN",
>  		.clear	= "   ",
> +	}, {
> +		.mask	= PTE_GP,
> +		.val	= PTE_GP,
> +		.set	= "GP",
> +		.clear	= "  ",
>  	}, {
>  		.mask	= PTE_ATTRINDX_MASK,
>  		.val	= PTE_ATTRINDX(MT_DEVICE_nGnRnE),
> -- 
> 2.20.1
> 

-- 
Kees Cook

  reply index

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-26 15:57 [PATCH v7 00/11] arm64: Branch Target Identification support Mark Brown
2020-02-26 15:57 ` [PATCH v7 01/11] ELF: UAPI and Kconfig additions for ELF program properties Mark Brown
2020-02-26 15:57 ` [PATCH v7 02/11] ELF: Add ELF program property parsing support Mark Brown
2020-02-26 15:57 ` [PATCH v7 03/11] arm64: Basic Branch Target Identification support Mark Brown
2020-02-26 15:57 ` [PATCH v7 04/11] elf: Allow arch to tweak initial mmap prot flags Mark Brown
2020-02-26 15:57 ` [PATCH v7 05/11] arm64: elf: Enable BTI at exec based on ELF program properties Mark Brown
2020-02-26 21:43   ` Kees Cook
2020-02-27  4:45   ` Amit Kachhap
2020-02-26 15:57 ` [PATCH v7 06/11] arm64: BTI: Decode BYTPE bits when printing PSTATE Mark Brown
2020-02-26 21:42   ` Kees Cook
2020-02-26 15:57 ` [PATCH v7 07/11] arm64: unify native/compat instruction skipping Mark Brown
2020-02-26 21:41   ` Kees Cook
2020-02-26 15:57 ` [PATCH v7 08/11] arm64: traps: Shuffle code to eliminate forward declarations Mark Brown
2020-02-26 21:39   ` Kees Cook
2020-02-26 15:57 ` [PATCH v7 09/11] arm64: BTI: Reset BTYPE when skipping emulated instructions Mark Brown
2020-02-26 15:57 ` [PATCH v7 10/11] KVM: " Mark Brown
2020-02-26 15:57 ` [PATCH v7 11/11] arm64: mm: Display guarded pages in ptdump Mark Brown
2020-02-26 21:38   ` Kees Cook [this message]
2020-02-26 21:44 ` [PATCH v7 00/11] arm64: Branch Target Identification support Kees Cook
2020-02-27 13:13   ` Mark Brown

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