xtables: add xt_match, xt_target and data copy_to_user functions

xt_entry_target, xt_entry_match and their private data may contain
kernel data.

Introduce helper functions xt_match_to_user, xt_target_to_user and
xt_data_to_user that copy only the expected fields. These replace
existing logic that calls copy_to_user on entire structs, then
overwrites select fields.

Private data is defined in xt_match and xt_target. All matches and
targets that maintain kernel data store this at the tail of their
private structure. Extend xt_match and xt_target with .usersize to
limit how many bytes of data are copied. The remainder is cleared.

If compatsize is specified, usersize can only safely be used if all
fields up to usersize use platform-independent types. Otherwise, the
compat_to_user callback must be defined.

This patch does not yet enable the support logic.

Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 54 insertions, 0 deletions

diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c
index 2ff499680cc6..feccf527abdd 100644
--- a/net/netfilter/x_tables.c
+++ b/net/netfilter/x_tables.c
@@ -262,6 +262,60 @@ struct xt_target *xt_request_find_target(u8 af, const char *name, u8 revision)
 }
 EXPORT_SYMBOL_GPL(xt_request_find_target);
 
+
+static int xt_obj_to_user(u16 __user *psize, u16 size,
+			  void __user *pname, const char *name,
+			  u8 __user *prev, u8 rev)
+{
+	if (put_user(size, psize))
+		return -EFAULT;
+	if (copy_to_user(pname, name, strlen(name) + 1))
+		return -EFAULT;
+	if (put_user(rev, prev))
+		return -EFAULT;
+
+	return 0;
+}
+
+#define XT_OBJ_TO_USER(U, K, TYPE, C_SIZE)				\
+	xt_obj_to_user(&U->u.TYPE##_size, C_SIZE ? : K->u.TYPE##_size,	\
+		       U->u.user.name, K->u.kernel.TYPE->name,		\
+		       &U->u.user.revision, K->u.kernel.TYPE->revision)
+
+int xt_data_to_user(void __user *dst, const void *src,
+		    int usersize, int size)
+{
+	usersize = usersize ? : size;
+	if (copy_to_user(dst, src, usersize))
+		return -EFAULT;
+	if (usersize != size && clear_user(dst + usersize, size - usersize))
+		return -EFAULT;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(xt_data_to_user);
+
+#define XT_DATA_TO_USER(U, K, TYPE, C_SIZE)				\
+	xt_data_to_user(U->data, K->data,				\
+			K->u.kernel.TYPE->usersize,			\
+			C_SIZE ? : K->u.kernel.TYPE->TYPE##size)
+
+int xt_match_to_user(const struct xt_entry_match *m,
+		     struct xt_entry_match __user *u)
+{
+	return XT_OBJ_TO_USER(u, m, match, 0) ||
+	       XT_DATA_TO_USER(u, m, match, 0);
+}
+EXPORT_SYMBOL_GPL(xt_match_to_user);
+
+int xt_target_to_user(const struct xt_entry_target *t,
+		      struct xt_entry_target __user *u)
+{
+	return XT_OBJ_TO_USER(u, t, target, 0) ||
+	       XT_DATA_TO_USER(u, t, target, 0);
+}
+EXPORT_SYMBOL_GPL(xt_target_to_user);
+
 static int match_revfn(u8 af, const char *name, u8 revision, int *bestp)
 {
 	const struct xt_match *m;