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VFIO fixes for v4.10-rc4

Browse Source 
- Cleanups and bug fixes for the mtty sample driver (Dan Carpenter)
  - Export and make use of has_capability() to fix incorrect use of
    ns_capable() for testing task capabilities (Jike Song)
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Merge tag 'vfio-v4.10-rc4' of git://github.com/awilliam/linux-vfio

Pull VFIO fixes from Alex Williamson:

 - Cleanups and bug fixes for the mtty sample driver (Dan Carpenter)

 - Export and make use of has_capability() to fix incorrect use of
   ns_capable() for testing task capabilities (Jike Song)

* tag 'vfio-v4.10-rc4' of git://github.com/awilliam/linux-vfio:
  vfio/type1: Remove pid_namespace.h include
  vfio iommu type1: fix the testing of capability for remote task
  capability: export has_capability
  vfio-mdev: remove some dead code
  vfio-mdev: buffer overflow in ioctl()
  vfio-mdev: return -EFAULT if copy_to_user() fails
This commit is contained in:
Linus Torvalds 2017-01-13 17:35:43 -08:00
commit af54efa4f5
3 changed files with 18 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/vfio/vfio_iommu_type1.c
View File

@ -36,7 +36,6 @@
#include <linux/uaccess.h>
#include <linux/vfio.h>
#include <linux/workqueue.h>
#include <linux/pid_namespace.h>
#include <linux/mdev.h>
#include <linux/notifier.h>
@ -495,8 +494,7 @@ 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;

1
kernel/capability.c
View File

@ -318,6 +318,7 @@ bool has_capability(struct task_struct *t, int cap)
{
return has_ns_capability(t, &init_user_ns, cap);
}
EXPORT_SYMBOL(has_capability);
/**
* has_ns_capability_noaudit - Does a task have a capability (unaudited)

23
samples/vfio-mdev/mtty.c
View File

@ -1073,7 +1073,7 @@ int mtty_get_region_info(struct mdev_device *mdev,
{
unsigned int size = 0;
struct mdev_state *mdev_state;
int bar_index;
u32 bar_index;
if (!mdev)
return -EINVAL;
@ -1082,8 +1082,11 @@ int mtty_get_region_info(struct mdev_device *mdev,
if (!mdev_state)
return -EINVAL;
mutex_lock(&mdev_state->ops_lock);
bar_index = region_info->index;
if (bar_index >= VFIO_PCI_NUM_REGIONS)
return -EINVAL;
mutex_lock(&mdev_state->ops_lock);
switch (bar_index) {
case VFIO_PCI_CONFIG_REGION_INDEX:
@ -1180,7 +1183,10 @@ static long mtty_ioctl(struct mdev_device *mdev, unsigned int cmd,
memcpy(&mdev_state->dev_info, &info, sizeof(info));
return copy_to_user((void __user *)arg, &info, minsz);
if (copy_to_user((void __user *)arg, &info, minsz))
return -EFAULT;
return 0;
}
case VFIO_DEVICE_GET_REGION_INFO:
{
@ -1201,7 +1207,10 @@ static long mtty_ioctl(struct mdev_device *mdev, unsigned int cmd,
if (ret)
return ret;
return copy_to_user((void __user *)arg, &info, minsz);
if (copy_to_user((void __user *)arg, &info, minsz))
return -EFAULT;
return 0;
}
case VFIO_DEVICE_GET_IRQ_INFO:
@ -1221,10 +1230,10 @@ static long mtty_ioctl(struct mdev_device *mdev, unsigned int cmd,
if (ret)
return ret;
if (info.count == -1)
return -EINVAL;
if (copy_to_user((void __user *)arg, &info, minsz))
return -EFAULT;
return copy_to_user((void __user *)arg, &info, minsz);
return 0;
}
case VFIO_DEVICE_SET_IRQS:
{