[RFC PATCH v3 12/15] arm64: kpkeys: Support KPKEYS_LVL_PGTABLES
From: Kevin Brodsky <hidden>
Date: 2025-02-03 10:20:28
Also in:
linux-hardening, linux-mm, lkml
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
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 <redacted> --- 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