twx-linux

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Ard Biesheuvel 3827efdb99 x86/mm: Fix NX bit clearing issue in kernel_map_pages_in_pgd

[ Upstream commit 75fbef0a8b ]

The following commit:

  15f003d207 ("x86/mm/pat: Don't implicitly allow _PAGE_RW in kernel_map_pages_in_pgd()")

modified kernel_map_pages_in_pgd() to manage writable permissions
of memory mappings in the EFI page table in a different way, but
in the process, it removed the ability to clear NX attributes from
read-only mappings, by clobbering the clear mask if _PAGE_RW is not
being requested.

Failure to remove the NX attribute from read-only mappings is
unlikely to be a security issue, but it does prevent us from
tightening the permissions in the EFI page tables going forward,
so let's fix it now.

Fixes: 15f003d207 ("x86/mm/pat: Don't implicitly allow _PAGE_RW in kernel_map_pages_in_pgd()
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20200113172245.27925-5-ardb@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>

2020-02-24 08:34:49 +01:00

alpha

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arc

ARC: [plat-axs10x]: Add missing multicast filter number to GMAC node

2020-02-14 16:33:25 -05:00

arm

ARM: dts: stm32: Add power-supply for DSI panel on stm32f469-disco

2020-02-24 08:34:45 +01:00

arm64

arm64: fix alternatives with LLVM's integrated assembler

2020-02-24 08:34:48 +01:00