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Re: [Xen-devel] [PATCH 1/2] xen/domain: Block more speculative out-of-bound accesses
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Norbert Manthey <nmanthey@xxxxxxxxx>
- Date: Thu, 25 Apr 2019 10:04:56 +0200
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- Cc: Julien Grall <julien.grall@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Thu, 25 Apr 2019 08:05:13 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 4/24/19 20:10, Andrew Cooper wrote:
> c/s f8303458 restricted speculative access for do_vcpu_op(), but neglected its
> compat counterpart, which is reachable by guests using the 32bit ABI.
>
> Make an identical adjustment.
>
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Reviewed-by: Norbert Manthey <nmanthey@xxxxxxxxx>
> ---
> CC: Jan Beulich <JBeulich@xxxxxxxx>
> CC: Wei Liu <wei.liu2@xxxxxxxxxx>
> CC: Roger Pau Monné <roger.pau@xxxxxxxxxx>
> CC: Stefano Stabellini <sstabellini@xxxxxxxxxx>
> CC: Julien Grall <julien.grall@xxxxxxx>
> CC: Norbert Manthey <nmanthey@xxxxxxxxx>
> ---
> xen/common/compat/domain.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/xen/common/compat/domain.c b/xen/common/compat/domain.c
> index 88bfdc8..39877b3 100644
> --- a/xen/common/compat/domain.c
> +++ b/xen/common/compat/domain.c
> @@ -39,7 +39,7 @@ int compat_vcpu_op(int cmd, unsigned int vcpuid,
> XEN_GUEST_HANDLE_PARAM(void) ar
> struct vcpu *v;
> int rc = 0;
>
> - if ( vcpuid >= d->max_vcpus || (v = d->vcpu[vcpuid]) == NULL )
> + if ( (v = domain_vcpu(d, vcpuid)) == NULL )
> return -ENOENT;
>
> switch ( cmd )
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