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Re: [Xen-devel] [PATCH v2 8/9] x86/vmx: Support removing MSRs from the host/guest load/save lists


  • To: Jan Beulich <JBeulich@xxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Tue, 12 Jun 2018 19:23:13 +0100
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  • Cc: Kevin Tian <kevin.tian@xxxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Jun Nakajima <jun.nakajima@xxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxx>
  • Delivery-date: Tue, 12 Jun 2018 18:24:26 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
  • Openpgp: preference=signencrypt

On 12/06/18 18:40, Andrew Cooper wrote:
> On 12/06/18 09:27, Jan Beulich wrote:
>>> +    end = start + total;
>>> +    ent = locate_msr_entry(start + substart, start + subend, msr);
>>> +
>>> +    if ( (ent == end) || (ent->index != msr) )
>>> +        return -ESRCH;
>>> +
>>> +    memmove(ent, ent + 1, sizeof(*ent) * (end - ent));
>> Aren't you running over the end of the array by 1 entry here?
> ent == end is an error condition above.  By this point, ent is
> guaranteed to be < end.

Although on further consideration, the size parameter should be (end -
ent - 1) to avoid moving the entry beyond the end of the array.

~Andrew

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