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[RFC,v3,12/15] arm64: kpkeys: Support KPKEYS_LVL_PGTABLES

Message ID 20250203101839.1223008-13-kevin.brodsky@arm.com (mailing list archive)
State New
Headers show
Series pkeys-based page table hardening | expand

Commit Message

Kevin Brodsky Feb. 3, 2025, 10:18 a.m. UTC 
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@arm.com>
---
 arch/arm64/include/asm/kpkeys.h | 2 ++
 1 file changed, 2 insertions(+)
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Patch

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;
 }