Re: [PATCH] KVM: add missing compat KVM_CLEAR_DIRTY_LOG

On Tue, Jul 27, 2021 at 08:49:01AM -0400, Paolo Bonzini wrote:

The arguments to the KVM_CLEAR_DIRTY_LOG ioctl include a pointer, therefore it needs a compat ioctl implementation. Otherwise, 32-bit userspace fails to invoke it on 64-bit kernels; for x86 it might work fine by chance if the padding is zero, but not on big-endian architectures.

Reported-by: Thomas Sattler Cc: stable@vger.kernel.org Signed-off-by: Paolo Bonzini pbonzini@redhat.com

Reviewed-by: Peter Xu peterx@redhat.com