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-rw-r--r--pkg/sentry/fs/proc/task.go44
1 files changed, 44 insertions, 0 deletions
diff --git a/pkg/sentry/fs/proc/task.go b/pkg/sentry/fs/proc/task.go
index 103bfc600..22d658acf 100644
--- a/pkg/sentry/fs/proc/task.go
+++ b/pkg/sentry/fs/proc/task.go
@@ -84,6 +84,7 @@ func (p *proc) newTaskDir(t *kernel.Task, msrc *fs.MountSource, isThreadGroup bo
"auxv": newAuxvec(t, msrc),
"cmdline": newExecArgInode(t, msrc, cmdlineExecArg),
"comm": newComm(t, msrc),
+ "cwd": newCwd(t, msrc),
"environ": newExecArgInode(t, msrc, environExecArg),
"exe": newExe(t, msrc),
"fd": newFdDir(t, msrc),
@@ -300,6 +301,49 @@ func (e *exe) Readlink(ctx context.Context, inode *fs.Inode) (string, error) {
return exec.PathnameWithDeleted(ctx), nil
}
+// cwd is an fs.InodeOperations symlink for the /proc/PID/cwd file.
+//
+// +stateify savable
+type cwd struct {
+ ramfs.Symlink
+
+ t *kernel.Task
+}
+
+func newCwd(t *kernel.Task, msrc *fs.MountSource) *fs.Inode {
+ cwdSymlink := &cwd{
+ Symlink: *ramfs.NewSymlink(t, fs.RootOwner, ""),
+ t: t,
+ }
+ return newProcInode(t, cwdSymlink, msrc, fs.Symlink, t)
+}
+
+// Readlink implements fs.InodeOperations.
+func (e *cwd) Readlink(ctx context.Context, inode *fs.Inode) (string, error) {
+ if !kernel.ContextCanTrace(ctx, e.t, false) {
+ return "", syserror.EACCES
+ }
+ if err := checkTaskState(e.t); err != nil {
+ return "", err
+ }
+ cwd := e.t.FSContext().WorkingDirectory()
+ if cwd == nil {
+ // It could have raced with process deletion.
+ return "", syserror.ESRCH
+ }
+ defer cwd.DecRef(ctx)
+
+ root := fs.RootFromContext(ctx)
+ if root == nil {
+ // It could have raced with process deletion.
+ return "", syserror.ESRCH
+ }
+ defer root.DecRef(ctx)
+
+ name, _ := cwd.FullName(root)
+ return name, nil
+}
+
// namespaceSymlink represents a symlink in the namespacefs, such as the files
// in /proc/<pid>/ns.
//