linux-kernel - Re: [PATCH] KVM: add missing compat KVM_CLEAR_DIRTY

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Message-ID: <YQAqRB7OPHHQNdJ+@t490s>
Date:   Tue, 27 Jul 2021 11:46:12 -0400
From:   Peter Xu <peterx@...hat.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        stable@...r.kernel.org
Subject: 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@...r.kernel.org
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>

Reviewed-by: Peter Xu <peterx@...hat.com>

-- 
Peter Xu