@@ -18,5 +18,6 @@
#define ARCH_X86_CET_DISABLE 0x3002
#define ARCH_X86_CET_LOCK 0x3003
#define ARCH_X86_CET_ALLOC_SHSTK 0x3004
+#define ARCH_X86_CET_GET_LEGACY_BITMAP 0x3005
#endif /* _ASM_X86_PRCTL_H */
@@ -21,6 +21,8 @@ static int handle_get_status(unsigned long arg2)
if (current->thread.cet.shstk_enabled)
features |= GNU_PROPERTY_X86_FEATURE_1_SHSTK;
+ if (current->thread.cet.ibt_enabled)
+ features |= GNU_PROPERTY_X86_FEATURE_1_IBT;
shstk_base = current->thread.cet.shstk_base;
shstk_size = current->thread.cet.shstk_size;
@@ -56,6 +58,31 @@ static int handle_alloc_shstk(unsigned long arg2)
return 0;
}
+static int handle_bitmap(unsigned long arg2)
+{
+ unsigned long addr, size;
+
+ if (current->thread.cet.ibt_enabled) {
+ int err;
+
+ err = cet_setup_ibt_bitmap();
+ if (err)
+ return err;
+
+ addr = current->thread.cet.ibt_bitmap_addr;
+ size = current->thread.cet.ibt_bitmap_size;
+ } else {
+ addr = 0;
+ size = 0;
+ }
+
+ if (put_user(addr, (unsigned long __user *)arg2) ||
+ put_user(size, (unsigned long __user *)arg2 + 1))
+ return -EFAULT;
+
+ return 0;
+}
+
int prctl_cet(int option, unsigned long arg2)
{
if (!cpu_x86_cet_enabled())
@@ -70,6 +97,8 @@ int prctl_cet(int option, unsigned long arg2)
return -EPERM;
if (arg2 & GNU_PROPERTY_X86_FEATURE_1_SHSTK)
cet_disable_free_shstk(current);
+ if (arg2 & GNU_PROPERTY_X86_FEATURE_1_IBT)
+ cet_disable_ibt();
return 0;
@@ -80,6 +109,12 @@ int prctl_cet(int option, unsigned long arg2)
case ARCH_X86_CET_ALLOC_SHSTK:
return handle_alloc_shstk(arg2);
+ /*
+ * Allocate legacy bitmap and return address & size to user.
+ */
+ case ARCH_X86_CET_GET_LEGACY_BITMAP:
+ return handle_bitmap(arg2);
+
default:
return -EINVAL;
}