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linux/arch/arm64
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Catalin Marinas 24cecc3774 arm64: Revert support for execute-only user mappings 
The ARMv8 64-bit architecture supports execute-only user permissions by
clearing the PTE_USER and PTE_UXN bits, practically making it a mostly
privileged mapping but from which user running at EL0 can still execute.

The downside, however, is that the kernel at EL1 inadvertently reading
such mapping would not trip over the PAN (privileged access never)
protection.

Revert the relevant bits from commit cab15ce604 ("arm64: Introduce
execute-only page access permissions") so that PROT_EXEC implies
PROT_READ (and therefore PTE_USER) until the architecture gains proper
support for execute-only user mappings.

Fixes: cab15ce604 ("arm64: Introduce execute-only page access permissions")
Cc: <stable@vger.kernel.org> # 4.9.x-
Acked-by: Will Deacon <will@kernel.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-01-06 10:10:07 -08:00
..
boot arm64: dts: ls1028a: fix reboot node 2019-12-12 09:59:38 +08:00
configs arm64: defconfig: re-run savedefconfig 2019-12-05 13:20:17 -08:00
crypto crypto: arch - conditionalize crypto api in arch glue for lib code 2019-11-27 13:08:49 +08:00
include arm64: Revert support for execute-only user mappings 2020-01-06 10:10:07 -08:00
kernel arm64: cpu_errata: Add Hisilicon TSV110 to spectre-v2 safe list 2019-12-20 17:57:22 +00:00
kvm PPC: 2019-12-22 10:26:59 -08:00
lib arm64: uaccess: Remove uaccess_*_not_uao asm macros 2019-11-20 18:51:54 +00:00
mm arm64: Revert support for execute-only user mappings 2020-01-06 10:10:07 -08:00
net arm64: bpf: optimize modulo operation 2019-09-03 15:44:40 +02:00
xen xen/efi: have a common runtime setup function 2019-10-02 10:31:07 -04:00
Kbuild arm64: add arch/arm64/Kbuild 2019-08-21 18:47:15 +01:00
Kconfig dma-mapping updates for 5.5-rc1 2019-11-28 11:16:43 -08:00
Kconfig.debug treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
Kconfig.platforms i.MX SoC update for 5.5: 2019-11-06 07:46:42 -08:00
Makefile arm64: implement ftrace with regs 2019-11-06 14:17:35 +00:00