KVM: arm64: Don't WARN on an unknown VM ioctl in protected mode

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kvm_pkvm_ioctl_allowed() WARNs when kvm_get_cap_for_kvm_ioctl() doesn't
find the ioctl number in vm_ioctl_caps[], and kvm_arch_vm_ioctl() calls
it for every number the generic code doesn't handle, so
ioctl(vm_fd, 0xdeadbeef) from userspace taints a pKVM host and panics it
under panic_on_warn. The lookup is fed userspace input: return false,
and userspace gets the -EINVAL kvm_arch_vm_ioctl() returns for that
number on a host without pKVM.

Fixes: b12b3b04f6 ("KVM: arm64: Check whether a VM IOCTL is allowed in pKVM")
Cc: stable@vger.kernel.org
Signed-off-by: Fuad Tabba <fuad.tabba@linux.dev>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://patch.msgid.link/20260914093838.1082637-1-fuad.tabba@linux.dev
Signed-off-by: Oliver Upton <oupton@kernel.org>

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Fuad Tabba 2026-09-14 10:38:38 +01:00 • committed by Oliver Upton

parent e5843f4eff

commit 49d9d295d6

1 changed files with 1 additions and 2 deletions

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arch/arm64/include/asm/kvm_pkvm.h

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