proc: remove kernel.maps_protect

After commit 831830b5a2b5d413407adf380ef62fe17d6fcbf2 aka
"restrict reading from /proc/<pid>/maps to those who share ->mm or can ptrace"
sysctl stopped being relevant because commit moved security checks from ->show
time to ->start time (mm_for_maps()).

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Acked-by: Kees Cook <kees.cook@canonical.com>

1 files changed, 0 insertions, 5 deletions

diff --git a/fs/proc/task_nommu.c b/fs/proc/task_nommu.c
index 5d84e7121df8..219bd79ea894 100644
--- a/fs/proc/task_nommu.c
+++ b/fs/proc/task_nommu.c
@@ -110,11 +110,6 @@ int task_statm(struct mm_struct *mm, int *shared, int *text,
 static int show_map(struct seq_file *m, void *_vml)
 {
         struct vm_list_struct *vml = _vml;
-        struct proc_maps_private *priv = m->private;
-        struct task_struct *task = priv->task;
-
-        if (maps_protect && !ptrace_may_access(task, PTRACE_MODE_READ))
-                return -EACCES;
 
         return nommu_vma_show(m, vml->vma);
 }