linux-hardening - [RFC PATCH 11/16] arm64: kpkeys: Support KPKEYS_LVL

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Message-ID: <20241206101110.1646108-12-kevin.brodsky@arm.com>
Date: Fri,  6 Dec 2024 10:11:05 +0000
From: Kevin Brodsky <kevin.brodsky@....com>
To: linux-hardening@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	Kevin Brodsky <kevin.brodsky@....com>,
	aruna.ramakrishna@...cle.com,
	broonie@...nel.org,
	catalin.marinas@....com,
	dave.hansen@...ux.intel.com,
	jannh@...gle.com,
	jeffxu@...omium.org,
	joey.gouly@....com,
	kees@...nel.org,
	maz@...nel.org,
	pierre.langlois@....com,
	qperret@...gle.com,
	ryan.roberts@....com,
	will@...nel.org,
	linux-arm-kernel@...ts.infradead.org,
	x86@...nel.org
Subject: [RFC PATCH 11/16] arm64: kpkeys: Support KPKEYS_LVL_PGTABLES

Enable RW access to KPKEYS_PKEY_PGTABLES (used to map page table
pages) if switching to KPKEYS_LVL_PGTABLES, otherwise only grant RO
access.

Signed-off-by: Kevin Brodsky <kevin.brodsky@....com>
---
 arch/arm64/include/asm/kpkeys.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/include/asm/kpkeys.h b/arch/arm64/include/asm/kpkeys.h
index e17f6df41873..4854e1f3babd 100644
--- a/arch/arm64/include/asm/kpkeys.h
+++ b/arch/arm64/include/asm/kpkeys.h
@@ -18,6 +18,8 @@ static inline bool arch_kpkeys_enabled(void)
 static inline u64 por_set_kpkeys_level(u64 por, int level)
 {
 	por = por_set_pkey_perms(por, KPKEYS_PKEY_DEFAULT, POE_RXW);
+	por = por_set_pkey_perms(por, KPKEYS_PKEY_PGTABLES,
+				 level == KPKEYS_LVL_PGTABLES ? POE_RW : POE_R);
 
 	return por;
 }
-- 
2.47.0