kptr_restrict for hiding kernel pointers from unprivileged users

[karo-tx-linux.git] / kernel / sysctl.c

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index ae5cbb1e3ced15b8cc2e00b052496953709cf4c2..c6811ee2092b165216a09bcd69153e2c0e1093c6 100644 (file)
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -24,6 +24,7 @@
 #include <linux/slab.h>
 #include <linux/sysctl.h>
 #include <linux/signal.h>
+#include <linux/printk.h>
 #include <linux/proc_fs.h>
 #include <linux/security.h>
 #include <linux/ctype.h>
@@ -710,6 +711,15 @@ static struct ctl_table kern_table[] = {
                .extra1         = &zero,
                .extra2         = &one,
        },
+       {
+               .procname       = "kptr_restrict",
+               .data           = &kptr_restrict,
+               .maxlen         = sizeof(int),
+               .mode           = 0644,
+               .proc_handler   = proc_dointvec_minmax,
+               .extra1         = &zero,
+               .extra2         = &two,
+       },
 #endif
        {
                .procname       = "ngroups_max",