Re: [PATCH] xen/memory: Reject out-of-range resource 'frame' values

[Julien Grall <julien@xxxxxxx>]

Hi Andrew,

On 28/01/2021 16:06, Andrew Cooper wrote:
> The ABI is unfortunate, and frame being 64 bits leads to all kinds of problems
> performing correct overflow checks.
>
> Furthermore, the mixed use of unsigned int and unsigned long in the call tree
> is buggy on arm32 where the two are the same size, and certain out-of-range
> combinations will truncated and be permitted.
set_foreign_p2m_entry() always return -EOPNOTSUPP, so I think this would 
not need a backport if the issue is Arm only.
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Reviewed-by: Julien Grall <jgrall@xxxxxxxxxx>

Cheers,

--
Julien Grall