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Merge branch 'ossfuzz-14870-dbus-message-variant-nesting' into 'master'
gdbusmessage: Limit recursion of variants in D-Bus messages See merge request GNOME/glib!1201
This commit is contained in:
Simon McVittie
commit
5bae85eccc
@ -58,6 +58,10 @@
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#include "glibintl.h"
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/* See https://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-marshaling-signature
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* This is 64 containers plus 1 value within them. */
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#define G_DBUS_MAX_TYPE_DEPTH (64 + 1)
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typedef struct _GMemoryBuffer GMemoryBuffer;
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struct _GMemoryBuffer
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{
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@ -1439,17 +1443,27 @@ read_bytes (GMemoryBuffer *mbuf,
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static GVariant *
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parse_value_from_blob (GMemoryBuffer *buf,
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const GVariantType *type,
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guint max_depth,
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gboolean just_align,
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guint indent,
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GError **error)
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{
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GVariant *ret;
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GError *local_error;
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GVariant *ret = NULL;
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GError *local_error = NULL;
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#ifdef DEBUG_SERIALIZER
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gboolean is_leaf;
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#endif /* DEBUG_SERIALIZER */
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const gchar *type_string;
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if (max_depth == 0)
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{
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g_set_error_literal (&local_error,
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G_IO_ERROR,
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G_IO_ERROR_INVALID_ARGUMENT,
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_("Value nested too deeply"));
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goto fail;
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}
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type_string = g_variant_type_peek_string (type);
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#ifdef DEBUG_SERIALIZER
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@ -1465,12 +1479,9 @@ parse_value_from_blob (GMemoryBuffer *buf,
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}
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#endif /* DEBUG_SERIALIZER */
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ret = NULL;
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#ifdef DEBUG_SERIALIZER
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is_leaf = TRUE;
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#endif /* DEBUG_SERIALIZER */
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local_error = NULL;
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switch (type_string[0])
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{
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case 'b': /* G_VARIANT_TYPE_BOOLEAN */
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@ -1690,6 +1701,17 @@ parse_value_from_blob (GMemoryBuffer *buf,
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goto fail;
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}
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if (max_depth == 1)
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{
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/* If we had recursed into parse_value_from_blob() again to
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* parse the array values, this would have been emitted. */
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g_set_error_literal (&local_error,
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G_IO_ERROR,
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G_IO_ERROR_INVALID_ARGUMENT,
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_("Value nested too deeply"));
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goto fail;
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}
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ensure_input_padding (buf, fixed_size);
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array_data = read_bytes (buf, array_len, &local_error);
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if (array_data == NULL)
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@ -1717,6 +1739,7 @@ parse_value_from_blob (GMemoryBuffer *buf,
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GVariant *item G_GNUC_UNUSED /* when compiling with G_DISABLE_ASSERT */;
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item = parse_value_from_blob (buf,
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element_type,
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max_depth - 1,
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TRUE,
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indent + 2,
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NULL);
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@ -1731,6 +1754,7 @@ parse_value_from_blob (GMemoryBuffer *buf,
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GVariant *item;
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item = parse_value_from_blob (buf,
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element_type,
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max_depth - 1,
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FALSE,
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indent + 2,
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&local_error);
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@ -1770,6 +1794,7 @@ parse_value_from_blob (GMemoryBuffer *buf,
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key_type = g_variant_type_key (type);
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key = parse_value_from_blob (buf,
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key_type,
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max_depth - 1,
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FALSE,
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indent + 2,
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&local_error);
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@ -1778,6 +1803,7 @@ parse_value_from_blob (GMemoryBuffer *buf,
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value_type = g_variant_type_value (type);
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value = parse_value_from_blob (buf,
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value_type,
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max_depth - 1,
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FALSE,
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indent + 2,
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&local_error);
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@ -1812,6 +1838,7 @@ parse_value_from_blob (GMemoryBuffer *buf,
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GVariant *item;
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item = parse_value_from_blob (buf,
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element_type,
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max_depth - 1,
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FALSE,
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indent + 2,
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&local_error);
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@ -1858,9 +1885,26 @@ parse_value_from_blob (GMemoryBuffer *buf,
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sig);
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goto fail;
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}
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if (max_depth <= g_variant_type_string_get_depth_ (sig))
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{
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/* Catch the type nesting being too deep without having to
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* parse the data. We don’t have to check this for static
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* container types (like arrays and tuples, above) because
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* the g_variant_type_string_is_valid() check performed before
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* the initial parse_value_from_blob() call should check the
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* static type nesting. */
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g_set_error_literal (&local_error,
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G_IO_ERROR,
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G_IO_ERROR_INVALID_ARGUMENT,
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_("Value nested too deeply"));
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goto fail;
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}
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variant_type = g_variant_type_new (sig);
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value = parse_value_from_blob (buf,
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variant_type,
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max_depth - 1,
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FALSE,
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indent + 2,
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&local_error);
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@ -2098,6 +2142,7 @@ g_dbus_message_new_from_blob (guchar *blob,
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#endif /* DEBUG_SERIALIZER */
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headers = parse_value_from_blob (&mbuf,
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G_VARIANT_TYPE ("a{yv}"),
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G_DBUS_MAX_TYPE_DEPTH + 2 /* for the a{yv} */,
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FALSE,
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2,
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error);
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@ -2169,6 +2214,7 @@ g_dbus_message_new_from_blob (guchar *blob,
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#endif /* DEBUG_SERIALIZER */
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message->body = parse_value_from_blob (&mbuf,
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variant_type,
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G_DBUS_MAX_TYPE_DEPTH + 1 /* for the surrounding tuple */,
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FALSE,
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2,
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error);
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@ -514,9 +514,8 @@ get_body_signature (GVariant *value)
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}
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/* If @value is floating, this assumes ownership. */
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static void
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check_serialization (GVariant *value,
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const gchar *expected_dbus_1_output)
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static gchar *
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get_and_check_serialization (GVariant *value)
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{
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guchar *blob;
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gsize blob_size;
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@ -525,7 +524,7 @@ check_serialization (GVariant *value,
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GDBusMessage *recovered_message;
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GError *error;
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DBusError dbus_error;
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gchar *s;
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gchar *s = NULL;
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guint n;
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message = g_dbus_message_new ();
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@ -597,9 +596,6 @@ check_serialization (GVariant *value,
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s = dbus_1_message_print (dbus_1_message);
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dbus_message_unref (dbus_1_message);
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g_assert_cmpstr (s, ==, expected_dbus_1_output);
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g_free (s);
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/* Then serialize back and check that the body is identical */
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error = NULL;
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@ -624,10 +620,22 @@ check_serialization (GVariant *value,
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}
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g_object_unref (message);
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return g_steal_pointer (&s);
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}
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/* If @value is floating, this assumes ownership. */
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static void
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check_serialization (GVariant *value,
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const gchar *expected_dbus_1_output)
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{
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gchar *s = get_and_check_serialization (value);
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g_assert_cmpstr (s, ==, expected_dbus_1_output);
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g_free (s);
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}
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static void
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message_serialize_basic (void)
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test_message_serialize_basic (void)
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{
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check_serialization (NULL, "");
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@ -661,10 +669,12 @@ message_serialize_basic (void)
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/* ---------------------------------------------------------------------------------------------------- */
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static void
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message_serialize_complex (void)
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test_message_serialize_complex (void)
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{
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GError *error;
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GVariant *value;
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guint i;
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gchar *serialization = NULL;
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error = NULL;
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@ -724,6 +734,37 @@ message_serialize_complex (void)
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" unix-fd: (not extracted)\n");
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g_variant_unref (value);
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#endif
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/* Deep nesting of variants (just below the recursion limit). */
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value = g_variant_new_string ("buried");
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for (i = 0; i < 64; i++)
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value = g_variant_new_variant (value);
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value = g_variant_new_tuple (&value, 1);
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serialization = get_and_check_serialization (value);
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g_assert_nonnull (serialization);
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g_assert_true (g_str_has_prefix (serialization,
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"value 0: variant:\n"
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" variant:\n"
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" variant:\n"));
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g_free (serialization);
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/* Deep nesting of arrays and structs (just below the recursion limit).
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* See https://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-marshaling-signature */
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value = g_variant_new_string ("hello");
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for (i = 0; i < 32; i++)
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value = g_variant_new_tuple (&value, 1);
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for (i = 0; i < 32; i++)
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value = g_variant_new_array (NULL, &value, 1);
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value = g_variant_new_tuple (&value, 1);
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serialization = get_and_check_serialization (value);
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g_assert_nonnull (serialization);
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g_assert_true (g_str_has_prefix (serialization,
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"value 0: array:\n"
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" array:\n"
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" array:\n"));
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g_free (serialization);
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}
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@ -749,7 +790,7 @@ replace (char *blob,
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}
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static void
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message_serialize_invalid (void)
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test_message_serialize_invalid (void)
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{
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guint n;
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@ -842,7 +883,7 @@ message_serialize_invalid (void)
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/* ---------------------------------------------------------------------------------------------------- */
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static void
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message_serialize_header_checks (void)
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test_message_serialize_header_checks (void)
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{
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GDBusMessage *message;
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GDBusMessage *reply;
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@ -996,7 +1037,7 @@ message_serialize_header_checks (void)
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/* ---------------------------------------------------------------------------------------------------- */
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static void
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message_parse_empty_arrays_of_arrays (void)
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test_message_parse_empty_arrays_of_arrays (void)
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{
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GVariant *body;
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GError *error = NULL;
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@ -1052,7 +1093,7 @@ message_parse_empty_arrays_of_arrays (void)
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/* ---------------------------------------------------------------------------------------------------- */
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static void
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test_double_array (void)
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test_message_serialize_double_array (void)
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{
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GVariantBuilder builder;
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GVariant *body;
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@ -1252,6 +1293,126 @@ test_message_parse_over_long_signature_header (void)
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/* ---------------------------------------------------------------------------------------------------- */
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/* Test that an invalid header in a D-Bus message (specifically, containing too
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* many levels of nested variant) is gracefully handled with an error rather
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* than a crash. The set of bytes here come almost directly from fuzzer output. */
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static void
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test_message_parse_deep_header_nesting (void)
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{
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const guint8 data[] = {
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'l', /* little-endian byte order */
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0x20, /* message type */
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0x20, /* message flags */
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0x01, /* major protocol version */
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0x20, 0x20, 0x20, 0x00, /* body length (invalid) */
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0x20, 0x20, 0x20, 0x20, /* message serial */
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/* a{yv} of header fields:
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* (things start to be even more invalid below here) */
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0x20, 0x20, 0x20, 0x00, /* array length (in bytes) */
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0x20, /* array key (this is not currently a valid header field) */
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/* Variant array value: */
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0x01, /* signature length */
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'v', /* one complete type */
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0x00, /* nul terminator */
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/* (Variant array value payload) */
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/* Critically, this contains 64 nested variants (minus two for the
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* ‘arbitrary valid content’ below, but ignoring two for the `a{yv}`
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* above), which in total exceeds %G_DBUS_MAX_TYPE_DEPTH. */
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0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00,
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||||
0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00,
|
||||
0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00,
|
||||
0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00,
|
||||
0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00,
|
||||
0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00,
|
||||
0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00,
|
||||
0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00,
|
||||
0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00,
|
||||
0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00,
|
||||
0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00,
|
||||
0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00,
|
||||
0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00,
|
||||
0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00,
|
||||
0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00,
|
||||
0x01, 'v', 0x00, 0x01, 'v', 0x00,
|
||||
/* Some arbitrary valid content inside the innermost variant: */
|
||||
0x01, 'y', 0x00, 0xcc,
|
||||
/* (message body length missing) */
|
||||
};
|
||||
gsize size = sizeof (data);
|
||||
GDBusMessage *message = NULL;
|
||||
GError *local_error = NULL;
|
||||
|
||||
message = g_dbus_message_new_from_blob ((guchar *) data, size,
|
||||
G_DBUS_CAPABILITY_FLAGS_NONE,
|
||||
&local_error);
|
||||
g_assert_error (local_error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT);
|
||||
g_assert_null (message);
|
||||
|
||||
g_clear_error (&local_error);
|
||||
}
|
||||
|
||||
/* ---------------------------------------------------------------------------------------------------- */
|
||||
|
||||
/* Test that an invalid body in a D-Bus message (specifically, containing too
|
||||
* many levels of nested variant) is gracefully handled with an error rather
|
||||
* than a crash. The set of bytes here are a modified version of the bytes from
|
||||
* test_message_parse_deep_header_nesting(). */
|
||||
static void
|
||||
test_message_parse_deep_body_nesting (void)
|
||||
{
|
||||
const guint8 data[] = {
|
||||
'l', /* little-endian byte order */
|
||||
0x20, /* message type */
|
||||
0x20, /* message flags */
|
||||
0x01, /* major protocol version */
|
||||
0x20, 0x20, 0x20, 0x00, /* body length (invalid) */
|
||||
0x20, 0x20, 0x20, 0x20, /* message serial */
|
||||
/* a{yv} of header fields: */
|
||||
0x07, 0x00, 0x00, 0x00, /* array length (in bytes) */
|
||||
0x08, /* array key (signature field) */
|
||||
/* Variant array value: */
|
||||
0x01, /* signature length */
|
||||
'g', /* one complete type */
|
||||
0x00, /* nul terminator */
|
||||
/* (Variant array value payload) */
|
||||
0x01, 'v', 0x00,
|
||||
/* End-of-header padding to reach an 8-byte boundary: */
|
||||
0x00,
|
||||
/* Message body: over 64 levels of nested variant, which is not valid: */
|
||||
0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00,
|
||||
0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00,
|
||||
0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00,
|
||||
0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00,
|
||||
0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00,
|
||||
0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00,
|
||||
0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00,
|
||||
0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00,
|
||||
0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00,
|
||||
0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00,
|
||||
0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00,
|
||||
0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00,
|
||||
0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00,
|
||||
0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00,
|
||||
0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00,
|
||||
0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00, 0x01, 'v', 0x00,
|
||||
/* Some arbitrary valid content inside the innermost variant: */
|
||||
0x01, 'y', 0x00, 0xcc,
|
||||
};
|
||||
gsize size = sizeof (data);
|
||||
GDBusMessage *message = NULL;
|
||||
GError *local_error = NULL;
|
||||
|
||||
message = g_dbus_message_new_from_blob ((guchar *) data, size,
|
||||
G_DBUS_CAPABILITY_FLAGS_NONE,
|
||||
&local_error);
|
||||
g_assert_error (local_error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT);
|
||||
g_assert_null (message);
|
||||
|
||||
g_clear_error (&local_error);
|
||||
}
|
||||
|
||||
/* ---------------------------------------------------------------------------------------------------- */
|
||||
|
||||
int
|
||||
main (int argc,
|
||||
char *argv[])
|
||||
@ -1262,15 +1423,19 @@ main (int argc,
|
||||
g_test_init (&argc, &argv, NULL);
|
||||
g_test_bug_base ("https://bugzilla.gnome.org/show_bug.cgi?id=");
|
||||
|
||||
g_test_add_func ("/gdbus/message-serialize-basic", message_serialize_basic);
|
||||
g_test_add_func ("/gdbus/message-serialize-complex", message_serialize_complex);
|
||||
g_test_add_func ("/gdbus/message-serialize-invalid", message_serialize_invalid);
|
||||
g_test_add_func ("/gdbus/message-serialize-header-checks", message_serialize_header_checks);
|
||||
g_test_add_func ("/gdbus/message-serialize/basic",
|
||||
test_message_serialize_basic);
|
||||
g_test_add_func ("/gdbus/message-serialize/complex",
|
||||
test_message_serialize_complex);
|
||||
g_test_add_func ("/gdbus/message-serialize/invalid",
|
||||
test_message_serialize_invalid);
|
||||
g_test_add_func ("/gdbus/message-serialize/header-checks",
|
||||
test_message_serialize_header_checks);
|
||||
g_test_add_func ("/gdbus/message-serialize/double-array",
|
||||
test_message_serialize_double_array);
|
||||
|
||||
g_test_add_func ("/gdbus/message-parse-empty-arrays-of-arrays",
|
||||
message_parse_empty_arrays_of_arrays);
|
||||
|
||||
g_test_add_func ("/gdbus/message-serialize/double-array", test_double_array);
|
||||
g_test_add_func ("/gdbus/message-parse/empty-arrays-of-arrays",
|
||||
test_message_parse_empty_arrays_of_arrays);
|
||||
g_test_add_func ("/gdbus/message-parse/non-signature-header",
|
||||
test_message_parse_non_signature_header);
|
||||
g_test_add_func ("/gdbus/message-parse/empty-signature-header",
|
||||
@ -1279,6 +1444,10 @@ main (int argc,
|
||||
test_message_parse_multiple_signature_header);
|
||||
g_test_add_func ("/gdbus/message-parse/over-long-signature-header",
|
||||
test_message_parse_over_long_signature_header);
|
||||
g_test_add_func ("/gdbus/message-parse/deep-header-nesting",
|
||||
test_message_parse_deep_header_nesting);
|
||||
g_test_add_func ("/gdbus/message-parse/deep-body-nesting",
|
||||
test_message_parse_deep_body_nesting);
|
||||
|
||||
return g_test_run();
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user