Re: [Xen-devel] Xen Security Advisory 173 (CVE-2016-3960) - x86 shadow pagetables: address width overflow

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 13.05.16 at 12:55, <hahn@xxxxxxxxxxxxx> wrote:
> Am 18.04.2016 um 15:31 schrieb Xen.org security team:
>> +/*
>> + * Bit 24 of a 24-bit flag mask!  This is not any bit of a real pte,
>> + * and is only used for signalling in variables that contain flags.
>> + */
>> +#define _PAGE_INVALID_BIT (1U<<24)
>> +
>>  #endif /* __X86_64_PAGE_H__ */
> 
> I guess using bit 24 is okay for 32 bit, too.
> 
> Can someone confirm that please?

Yes, that should be fine.

Jan


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