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>
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 73d1891..4806830 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -210,9 +210,6 @@
dev_t dev = 0;
int len;
- if (maps_protect && !ptrace_may_access(task, PTRACE_MODE_READ))
- return -EACCES;
-
if (file) {
struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
dev = inode->i_sb->s_dev;
@@ -742,22 +739,11 @@
#ifdef CONFIG_NUMA
extern int show_numa_map(struct seq_file *m, void *v);
-static int show_numa_map_checked(struct seq_file *m, void *v)
-{
- 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 show_numa_map(m, v);
-}
-
static const struct seq_operations proc_pid_numa_maps_op = {
.start = m_start,
.next = m_next,
.stop = m_stop,
- .show = show_numa_map_checked
+ .show = show_numa_map,
};
static int numa_maps_open(struct inode *inode, struct file *file)