1 files changed, 18 insertions, 0 deletions

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 7e9f07bf260d..ce3465479447 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2905,6 +2905,21 @@ static int proc_pid_patch_state(struct seq_file *m, struct pid_namespace *ns,
 }
 #endif /* CONFIG_LIVEPATCH */
 
+#ifdef CONFIG_STACKLEAK_METRICS
+static int proc_stack_depth(struct seq_file *m, struct pid_namespace *ns,
+                                struct pid *pid, struct task_struct *task)
+{
+        unsigned long prev_depth = THREAD_SIZE -
+                                (task->prev_lowest_stack & (THREAD_SIZE - 1));
+        unsigned long depth = THREAD_SIZE -
+                                (task->lowest_stack & (THREAD_SIZE - 1));
+
+        seq_printf(m, "previous stack depth: %lu\nstack depth: %lu\n",
+                                                        prev_depth, depth);
+        return 0;
+}
+#endif /* CONFIG_STACKLEAK_METRICS */
+
 /*
  * Thread groups
  */
@@ -3006,6 +3021,9 @@ static const struct pid_entry tgid_base_stuff[] = {
 #ifdef CONFIG_LIVEPATCH
         ONE("patch_state",  S_IRUSR, proc_pid_patch_state),
 #endif
+#ifdef CONFIG_STACKLEAK_METRICS
+        ONE("stack_depth", S_IRUGO, proc_stack_depth),
+#endif
 };
 
 static int proc_tgid_base_readdir(struct file *file, struct dir_context *ctx)