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From: Mark Brown <broonie@kernel.org>
To: Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>
Cc: "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>,
	"Kees Cook" <keescook@chromium.org>,
	"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, "Mark Brown" <broonie@kernel.org>
Subject: [PATCH v9 11/13] arm64: mm: Display guarded pages in ptdump
Date: Wed, 11 Mar 2020 19:26:06 +0000	[thread overview]
Message-ID: <20200311192608.40095-12-broonie@kernel.org> (raw)
In-Reply-To: <20200311192608.40095-1-broonie@kernel.org>

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>
---
 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


  parent reply	other threads:[~2020-03-11 19:33 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-11 19:25 [PATCH v9 00/13] arm64: Branch Target Identification support Mark Brown
2020-03-11 19:25 ` [PATCH v9 01/13] ELF: UAPI and Kconfig additions for ELF program properties Mark Brown
2020-03-11 19:25 ` [PATCH v9 02/13] ELF: Add ELF program property parsing support Mark Brown
2020-03-12 23:59   ` Kees Cook
2020-03-13 11:55     ` Mark Brown
2020-03-11 19:25 ` [PATCH v9 03/13] arm64: Basic Branch Target Identification support Mark Brown
2020-03-11 19:25 ` [PATCH v9 04/13] elf: Allow arch to tweak initial mmap prot flags Mark Brown
2020-03-11 19:26 ` [PATCH v9 05/13] arm64: elf: Enable BTI at exec based on ELF program properties Mark Brown
2020-03-11 19:26 ` [PATCH v9 06/13] arm64: BTI: Decode BYTPE bits when printing PSTATE Mark Brown
2020-03-11 19:26 ` [PATCH v9 07/13] arm64: unify native/compat instruction skipping Mark Brown
2020-03-11 19:26 ` [PATCH v9 08/13] arm64: traps: Shuffle code to eliminate forward declarations Mark Brown
2020-03-14 11:18   ` Catalin Marinas
2020-03-11 19:26 ` [PATCH v9 09/13] arm64: BTI: Reset BTYPE when skipping emulated instructions Mark Brown
2020-03-11 19:26 ` [PATCH v9 10/13] KVM: " Mark Brown
2020-03-11 19:26 ` Mark Brown [this message]
2020-03-11 19:26 ` [PATCH v9 12/13] mm: smaps: Report arm64 guarded pages in smaps Mark Brown
2020-03-13  0:00   ` Kees Cook
2020-03-11 19:26 ` [PATCH v9 13/13] arm64: BTI: Add Kconfig entry for userspace BTI Mark Brown
2020-03-13  0:01   ` Kees Cook

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