diff options
Diffstat (limited to 'pkg/sentry/fs/proc/mounts.go')
| -rw-r--r-- | pkg/sentry/fs/proc/mounts.go | 34 |
1 files changed, 30 insertions, 4 deletions
diff --git a/pkg/sentry/fs/proc/mounts.go b/pkg/sentry/fs/proc/mounts.go index e33c4a460..c10888100 100644 --- a/pkg/sentry/fs/proc/mounts.go +++ b/pkg/sentry/fs/proc/mounts.go @@ -18,13 +18,16 @@ import ( "bytes" "fmt" "sort" + "strings" - "gvisor.dev/gvisor/pkg/sentry/context" + "gvisor.dev/gvisor/pkg/context" "gvisor.dev/gvisor/pkg/sentry/fs" "gvisor.dev/gvisor/pkg/sentry/fs/proc/seqfile" "gvisor.dev/gvisor/pkg/sentry/kernel" ) +// LINT.IfChange + // forEachMountSource runs f for the process root mount and each mount that is a // descendant of the root. func forEachMount(t *kernel.Task, fn func(string, *fs.Mount)) { @@ -144,14 +147,35 @@ func (mif *mountInfoFile) ReadSeqFileData(ctx context.Context, handle seqfile.Se // (10) Mount source: filesystem-specific information or "none". fmt.Fprintf(&buf, "none ") - // (11) Superblock options. Only "ro/rw" is supported for now, - // and is the same as the filesystem option. - fmt.Fprintf(&buf, "%s\n", opts) + // (11) Superblock options, and final newline. + fmt.Fprintf(&buf, "%s\n", superBlockOpts(mountPath, mroot.Inode.MountSource)) }) return []seqfile.SeqData{{Buf: buf.Bytes(), Handle: (*mountInfoFile)(nil)}}, 0 } +func superBlockOpts(mountPath string, msrc *fs.MountSource) string { + // gVisor doesn't (yet) have a concept of super block options, so we + // use the ro/rw bit from the mount flag. + opts := "rw" + if msrc.Flags.ReadOnly { + opts = "ro" + } + + // NOTE(b/147673608): If the mount is a cgroup, we also need to include + // the cgroup name in the options. For now we just read that from the + // path. + // TODO(gvisor.dev/issues/190): Once gVisor has full cgroup support, we + // should get this value from the cgroup itself, and not rely on the + // path. + if msrc.FilesystemType == "cgroup" { + splitPath := strings.Split(mountPath, "/") + cgroupType := splitPath[len(splitPath)-1] + opts += "," + cgroupType + } + return opts +} + // mountsFile is used to implement /proc/[pid]/mounts. // // +stateify savable @@ -195,3 +219,5 @@ func (mf *mountsFile) ReadSeqFileData(ctx context.Context, handle seqfile.SeqHan return []seqfile.SeqData{{Buf: buf.Bytes(), Handle: (*mountsFile)(nil)}}, 0 } + +// LINT.ThenChange(../../fsimpl/proc/tasks_files.go) |