4 files changed, 29 insertions, 1 deletions

diff --git a/fs/proc/base.c b/fs/proc/base.c
index a721acfd4fdc..17f7a7ee6c5e 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -64,6 +64,7 @@
 #include <linux/smp_lock.h>
 #include <linux/rcupdate.h>
 #include <linux/kallsyms.h>
+#include <linux/module.h>
 #include <linux/mount.h>
 #include <linux/security.h>
 #include <linux/ptrace.h>
@@ -123,6 +124,9 @@ struct pid_entry {
                 NULL, &proc_info_file_operations,       \
                 { .proc_read = &proc_##OTYPE } )
 
+int maps_protect;
+EXPORT_SYMBOL(maps_protect);
+
 static struct fs_struct *get_fs_struct(struct task_struct *task)
 {
         struct fs_struct *fs;
diff --git a/fs/proc/internal.h b/fs/proc/internal.h
index f771889183c3..b215c3524fa6 100644
--- a/fs/proc/internal.h
+++ b/fs/proc/internal.h
@@ -37,6 +37,8 @@ do {						\
 extern int nommu_vma_show(struct seq_file *, struct vm_area_struct *);
 #endif
 
+extern int maps_protect;
+
 extern void create_seq_entry(char *name, mode_t mode, const struct file_operations *f);
 extern int proc_exe_link(struct inode *, struct dentry **, struct vfsmount **);
 extern int proc_tid_stat(struct task_struct *,  char *);
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 4008c060f7ef..c24d81a5a040 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -3,6 +3,7 @@
 #include <linux/mount.h>
 #include <linux/seq_file.h>
 #include <linux/highmem.h>
+#include <linux/ptrace.h>
 #include <linux/pagemap.h>
 #include <linux/mempolicy.h>
 
@@ -142,6 +143,9 @@ static int show_map_internal(struct seq_file *m, void *v, struct mem_size_stats
         dev_t dev = 0;
         int len;
 
+        if (maps_protect && !ptrace_may_attach(task))
+                return -EACCES;
+
         if (file) {
                 struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
                 dev = inode->i_sb->s_dev;
@@ -512,11 +516,22 @@ const struct file_operations proc_maps_operations = {
 #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_attach(task))
+                return -EACCES;
+
+        return show_numa_map(m, v);
+}
+
 static struct seq_operations proc_pid_numa_maps_op = {
         .start  = m_start,
         .next   = m_next,
         .stop   = m_stop,
-        .show   = show_numa_map
+        .show   = show_numa_map_checked
 };
 
 static int numa_maps_open(struct inode *inode, struct file *file)
diff --git a/fs/proc/task_nommu.c b/fs/proc/task_nommu.c
index 7cddf6b8635a..d8b8c7183c24 100644
--- a/fs/proc/task_nommu.c
+++ b/fs/proc/task_nommu.c
@@ -2,6 +2,7 @@
 #include <linux/mm.h>
 #include <linux/file.h>
 #include <linux/mount.h>
+#include <linux/ptrace.h>
 #include <linux/seq_file.h>
 #include "internal.h"
 
@@ -143,6 +144,12 @@ out:
 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_attach(task))
+                return -EACCES;
+
         return nommu_vma_show(m, vml->vma);
 }