diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 956b75d61809f06cdf433411456bb08278726eb5..6dee68d013ffa69f1f6c9d49873f17f19eb3874d 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -1325,6 +1325,9 @@ static ssize_t pagemap_read(struct file *file, char __user *buf,
 
 static int pagemap_open(struct inode *inode, struct file *file)
 {
+	/* do not disclose physical addresses: attack vector */
+	if (!capable(CAP_SYS_ADMIN))
+		return -EPERM;
 	pr_warn_once("Bits 55-60 of /proc/PID/pagemap entries are about "
 			"to stop being page-shift some time soon. See the "
 			"linux/Documentation/vm/pagemap.txt for details.\n");