Re: [Xen-devel] [PATCH 1/4] x86/mm: mod_l<N>_entry() have no need to use __copy_from_user()

[Jan Beulich <jbeulich@xxxxxxxx>]

On 20.12.2019 15:42, Andrew Cooper wrote:
> On 20/12/2019 14:19, Jan Beulich wrote:
>> mod_l1_entry()'s need to do so went away with commit 2d0557c5cb ("x86:
>> Fold page_info lock into type_info"), and the other three never had such
>> a need, at least going back as far as 3.2.0.
>>
>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
> 
> These presumably want ACCESS_ONCE() to avoid introducing repeated read
> vulnerabilities?  While the mappings might be safe, they still point to
> live guest data.

Oh, yes - will do.

Jan

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxxx
https://lists.xenproject.org/mailman/listinfo/xen-devel