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gvariant: Fix checking arithmetic for tuple element ends

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When checking whether a serialised GVariant tuple is in normal form,
it’s possible for `offset_ptr -= offset_size` to underflow and wrap
around, resulting in gvs_read_unaligned_le() reading memory outside the
serialised GVariant bounds.

See §(Tuples) in gvariant-serialiser.c for the documentation on how
tuples are serialised. Briefly, all variable-length elements in the
tuple have an offset to their end stored in an array of offsets at the
end of the tuple. The width of each offset is in offset_size. offset_ptr
is added to the start of the serialised tuple to get the offset which is
currently being examined. The offset array is in reverse order compared
to the tuple elements, hence the subtraction.

The bug can be triggered if a tuple contains a load of variable-length
elements, each of whose length is actually zero (i.e. empty arrays).

Includes a unit test.

oss-fuzz#9801

Signed-off-by: Philip Withnall <withnall@endlessm.com>
This commit is contained in:
Philip Withnall 2018-08-16 20:12:02 +01:00
parent da512adc34
commit eb7c9adc3b
2 changed files with 31 additions and 0 deletions
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3
glib/gvariant-serialiser.c
View File

@ -1065,6 +1065,9 @@ gvs_tuple_is_normal (GVariantSerialised value)
break;
case G_VARIANT_MEMBER_ENDING_OFFSET:
if (offset_ptr < offset_size)
return FALSE;
offset_ptr -= offset_size;
if (offset_ptr < offset)

28
glib/tests/gvariant.c
View File

@ -4631,6 +4631,30 @@ test_stack_dict_init (void)
g_variant_unref (variant);
}
/* Test checking arbitrary binary data for normal form. This time, it’s a tuple
* with invalid element ends. */
static void
test_normal_checking_tuples (void)
{
const guint8 data[] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00,
'a', '(', 'a', 'o', 'a', 'o', 'a', 'a', 'o', 'a', 'a', 'o', ')'
};
gsize size = sizeof (data);
GVariant *variant = NULL;
GVariant *normal_variant = NULL;
variant = g_variant_new_from_data (G_VARIANT_TYPE_VARIANT, data, size,
FALSE, NULL, NULL);
g_assert_nonnull (variant);
normal_variant = g_variant_get_normal_form (variant);
g_assert_nonnull (normal_variant);
g_variant_unref (normal_variant);
g_variant_unref (variant);
}
int
main (int argc, char **argv)
{
@ -4692,5 +4716,9 @@ main (int argc, char **argv)
g_test_add_func ("/gvariant/stack-builder-init", test_stack_builder_init);
g_test_add_func ("/gvariant/stack-dict-init", test_stack_dict_init);
g_test_add_func ("/gvariant/normal-checking/tuples",
test_normal_checking_tuples);
return g_test_run ();
}