Marc Zyngier 4f902f03ef KVM: arm64: Fix AArch32 register narrowing on userspace write ... commit 947051e361 upstream. When userspace writes to one of the core registers, we make sure to narrow the corresponding GPRs if PSTATE indicates an AArch32 context. The code tries to check whether the context is EL0 or EL1 so that it narrows the correct registers. But it does so by checking the full PSTATE instead of PSTATE.M. As a consequence, and if we are restoring an AArch32 EL0 context in a 64bit guest, and that PSTATE has *any* bit set outside of PSTATE.M, we narrow *all* registers instead of only the first 15, destroying the 64bit state. Obviously, this is not something the guest is likely to enjoy. Correctly masking PSTATE to only evaluate PSTATE.M fixes it. Fixes: 90c1f934ed ("KVM: arm64: Get rid of the AArch32 register mapping code") Reported-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com> Cc: stable@vger.kernel.org Reviewed-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com> Acked-by: Oliver Upton <oliver.upton@linux.dev> Link: https://lore.kernel.org/r/20240524141956.1450304-2-maz@kernel.org Signed-off-by: Marc Zyngier <maz@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2024-06-16 13:41:37 +02:00
..
boot	arm64: dts: hi3798cv200: fix the size of GICR	2024-06-16 13:41:35 +02:00
configs	arm64: defconfig: remove CONFIG_COMMON_CLK_NPCM8XX=y	2023-10-06 14:57:03 +02:00
crypto	crypto: arm64/neonbs - fix out-of-bounds access on short input	2024-03-06 14:45:10 +00:00
hyperv	hyperv: simplify and rename generate_guest_id	2022-09-28 13:36:56 +00:00
include	arm64: asm-bug: Add .align 2 to the end of __BUG_ENTRY	2024-06-12 11:03:52 +02:00
kernel	arm64/sve: Lower the maximum allocation for the SVE ptrace regset	2024-03-26 18:20:25 -04:00
kvm	KVM: arm64: Fix AArch32 register narrowing on userspace write	2024-06-16 13:41:37 +02:00
lib	arm64: csum: Fix OoB access in IP checksum code for negative lengths	2023-09-13 09:43:01 +02:00
mm	arm64: hibernate: Fix level3 translation fault in swsusp_save()	2024-04-27 17:07:16 +02:00
net	bpf, arm64: Fix incorrect runtime stats	2024-05-17 11:55:58 +02:00
tools	arm64: Rename ARM64_WORKAROUND_2966298	2024-01-31 16:17:01 -08:00
xen
Kbuild
Kconfig	arm64: atomics: lse: remove stale dependency on JUMP_LABEL	2024-05-25 16:21:34 +02:00
Kconfig.debug
Kconfig.platforms	ARM: SoC code changes for 6.1	2022-10-06 11:22:25 -07:00
Makefile	arm64: add dependency between vmlinuz.efi and Image	2023-12-20 17:00:24 +01:00