| Message ID | 1482336616-19252-3-git-send-email-jike.song@intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
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@redhat.com> > Cc: Kirti Wankhede <kwankhede@nvidia.com> > Cc: Gerd Hoffmann <kraxel@redhat.com> > Signed-off-by: Jike Song <jike.song@intel.com> > --- > 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. > 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; > Thanks, Kirti -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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@redhat.com> >> Cc: Kirti Wankhede <kwankhede@nvidia.com> >> Cc: Gerd Hoffmann <kraxel@redhat.com> >> Signed-off-by: Jike Song <jike.song@intel.com> >> --- >> 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; >> -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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); 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;
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@redhat.com> Cc: Kirti Wankhede <kwankhede@nvidia.com> Cc: Gerd Hoffmann <kraxel@redhat.com> Signed-off-by: Jike Song <jike.song@intel.com> --- drivers/vfio/vfio_iommu_type1.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-)