On 12/22/2016 08:20 PM, Kirti Wankhede wrote:
> On 12/21/2016 9:40 PM, Jike Song wrote:
>> Before the mdev enhancement type1 iommu used capable() to test the
>> capability of current task; in the course of mdev development a
>> new requirement, testing for another task other than current, was
>> raised. ns_capable() was used for this purpose, however it still
>> tests current, the only difference is, in a specified namespace.
>>
>> Fix it by using has_capability() instead, which tests the cap for
>> specified task in init_user_ns, the same namespace as capable().
>>
>> Cc: Alex Williamson <alex.williamson@xxxxxxxxxx>
>> Cc: Kirti Wankhede <kwankhede@xxxxxxxxxx>
>> Cc: Gerd Hoffmann <kraxel@xxxxxxxxxx>
>> Signed-off-by: Jike Song <jike.song@xxxxxxxxx>
>> ---
>> drivers/vfio/vfio_iommu_type1.c | 6 ++----
>> 1 file changed, 2 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
>> index f3726ba..b54aedf 100644
>> --- a/drivers/vfio/vfio_iommu_type1.c
>> +++ b/drivers/vfio/vfio_iommu_type1.c
>> @@ -394,8 +394,7 @@ static long vfio_pin_pages_remote(struct vfio_dma *dma, unsigned long vaddr,
>> long npage, unsigned long *pfn_base)
>> {
>> unsigned long limit;
>> - bool lock_cap = ns_capable(task_active_pid_ns(dma->task)->user_ns,
>> - CAP_IPC_LOCK);
>> + bool lock_cap = has_capability(dma->task, CAP_IPC_LOCK);
>
>
> Hi Jike,
>
> Alex's patch already changes this to capable(), you need to resolve.
> https://lkml.org/lkml/2016/12/20/490
>
> You need to do only below change, which looks fine to me.
>
Thanks for the point, will change it in v2. However, that will probably be
after patch 1/2 accepted, otherwise we get undefined symbols.
--
Thanks,
Jike
>> struct mm_struct *mm;
>> long ret, i = 0, lock_acct = 0;
>> bool rsvd;
>> @@ -491,8 +490,7 @@ static int vfio_pin_page_external(struct vfio_dma *dma, unsigned long vaddr,
>> unsigned long *pfn_base, bool do_accounting)
>> {
>> unsigned long limit;
>> - bool lock_cap = ns_capable(task_active_pid_ns(dma->task)->user_ns,
>> - CAP_IPC_LOCK);
>> + bool lock_cap = has_capability(dma->task, CAP_IPC_LOCK);
>> struct mm_struct *mm;
>> int ret;
>> bool rsvd;
>>
--
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