| Message ID | 20210302091418.7226-1-jasowang@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | vhost-vdpa: honor CAP_IPC_LOCK | expand |
On 2021/3/2 5:51 下午, Michael S. Tsirkin wrote: > On Tue, Mar 02, 2021 at 04:14:18AM -0500, Jason Wang wrote: >> When CAP_IPC_LOCK is set we should not check locked memory against >> rlimit as what has been implemented in mlock(). >> >> Signed-off-by: Jason Wang <jasowang@redhat.com> > Indeed and it's not just mlock. > > 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. > > and let's add a Fixes: tag? Sure, V2 is posted. Thanks > >> --- >> 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
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(). Signed-off-by: Jason Wang <jasowang@redhat.com> --- drivers/vhost/vdpa.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)