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Merge pull request #64324 from cofyc/fix62102

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Automatic merge from submit-queue (batch tested with PRs 64399, 64324, 64404, 64406, 64396). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Should use `hostProcMountinfoPath` constant in nsenter_mount.go.

**What this PR does / why we need it**:

In nsenter mounter implementation, we should read mountinfo from `/rootfs/proc/1/mountinfo` instead of `/proc/self/mountinfo`.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #

**Special notes for your reviewer**:

`/proc/self/mountinfo` will prefix `/rootfs` on mount point path, see

```
$ mkdir /mnt/test
$ mount -t tmpfs tmpfs /mnt/test/
$ docker run -it --volume=/:/rootfs:ro,rslave --net=host --pid=host --privileged=true busybox:latest cat /rootfs/proc/1/mountinfo | grep '\/mnt\/test'
442 25 0:80 / /mnt/test rw,relatime shared:70 - tmpfs tmpfs rw
$ docker run -it --volume=/:/rootfs:ro,rslave --net=host --pid=host --privileged=true busybox:latest cat /proc/self/mountinfo | grep '\/mnt\/test'
1075 985 0:80 / /rootfs/mnt/test rw,relatime master:70 - tmpfs tmpfs rw
```

**Release note**:

```release-note
NONE
```
This commit is contained in:
Kubernetes Submit Queue 2018-05-28 15:06:17 -07:00 committed by GitHub
commit 881c3cf508
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1 changed files with 2 additions and 2 deletions
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4
pkg/util/mount/nsenter_mount.go
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@ -333,7 +333,7 @@ func (mounter *NsenterMounter) GetMountRefs(pathname string) ([]string, error) {
if err != nil {
return nil, err
}
return searchMountPoints(hostpath, procMountInfoPath)
return searchMountPoints(hostpath, hostProcMountinfoPath)
}
func (mounter *NsenterMounter) GetFSGroup(pathname string) (int64, error) {
@ -345,5 +345,5 @@ func (mounter *NsenterMounter) GetFSGroup(pathname string) (int64, error) {
}
func (mounter *NsenterMounter) GetSELinuxSupport(pathname string) (bool, error) {
return getSELinuxSupport(pathname, procMountInfoPath)
return getSELinuxSupport(pathname, hostProcMountsPath)
}