| Message ID | 20210302105158.8240-1-jasowang@redhat.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [V2] vhost-vdpa: honor CAP_IPC_LOCK | expand |
diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c index ef688c8c0e0e..e93572e2e344 100644 --- a/drivers/vhost/vdpa.c +++ b/drivers/vhost/vdpa.c @@ -638,7 +638,8 @@ static int vhost_vdpa_process_iotlb_update(struct vhost_vdpa *v, mmap_read_lock(dev->mm); lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; - if (npages + atomic64_read(&dev->mm->pinned_vm) > lock_limit) { + if (!capable(CAP_IPC_LOCK) && + (npages + atomic64_read(&dev->mm->pinned_vm) > lock_limit)) { ret = -ENOMEM; goto unlock; }
When CAP_IPC_LOCK is set we should not check locked memory against rlimit as what has been implemented in mlock() and documented in Documentation/admin-guide/perf-security.rst: " RLIMIT_MEMLOCK and perf_event_mlock_kb resource constraints are ignored for processes with the CAP_IPC_LOCK capability. " Fixes: 4c8cf31885f6 ("vhost: introduce vDPA-based backend") Signed-off-by: Jason Wang <jasowang@redhat.com> --- drivers/vhost/vdpa.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)