* [PATCH V2] vhost-vdpa: honor CAP_IPC_LOCK
@ 2021-03-02 10:51 Jason Wang
0 siblings, 0 replies; only message in thread
From: Jason Wang @ 2021-03-02 10:51 UTC (permalink / raw)
To: mst, jasowang, kvm; +Cc: virtualization, netdev, linux-kernel
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(-)
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;
}
--
2.18.1
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