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Pawan Gupta 43778de19d x86/entry_32: Clear CPU buffers after register restore in NMI return

commit 48a2440d0f upstream.

CPU buffers are currently cleared after call to exc_nmi, but before
register state is restored. This may be okay for MDS mitigation but not for
RDFS. Because RDFS mitigation requires CPU buffers to be cleared when
registers don't have any sensitive data.

Move CLEAR_CPU_BUFFERS after RESTORE_ALL_NMI.

Fixes: a0e2dab44d ("x86/entry_32: Add VERW just before userspace transition")
Suggested-by: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc:stable@vger.kernel.org
Link: https://lore.kernel.org/all/20240925-fix-dosemu-vm86-v7-2-1de0daca2d42%40linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2024-10-22 15:56:50 +02:00

alpha

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arc

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arm

crypto: simd - Do not call crypto_alloc_tfm during registration

2024-10-17 15:21:39 +02:00

arm64

arm64: probes: Fix simulate_ldr*_literal()

2024-10-22 15:56:43 +02:00

csky