1 /*
2 * Copyright (C) 2020 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <cxxabi.h>
30 #include <gtest/gtest.h>
31 #include <string.h>
32
TEST(__cxa_demangle,cxa_demangle_fuzz_152588929)33 TEST(__cxa_demangle, cxa_demangle_fuzz_152588929) {
34 #if defined(__aarch64__)
35 // Test the C++ demangler on an invalid mangled string. libc++abi currently
36 // parses it like so:
37 // (1 "\006") (I (L e "eeEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE" E) E)
38 // There are a few interesting things about this mangled input:
39 // - The IA64 C++ ABI specifies that an FP literal's hex chars are lowercase.
40 // The libc++abi demangler currently accepts uppercase A-F digits, which is
41 // confusing because 'E' is supposed to mark the end of the <expr-primary>.
42 // - libc++abi uses snprintf("%a") which puts an unspecified number of bits
43 // in the digit before the decimal point.
44 // - The identifier name is "\006", and the IA64 C++ ABI spec is explicit
45 // about not specifying the encoding for characters outside of
46 // [_A-Za-z0-9].
47 // - The 'e' type is documented as "long double, __float80", and in practice
48 // the length of the literal depends on the arch. For arm64, it is a
49 // 128-bit FP type encoded using 32 hex chars. The situation with x86-64
50 // Android OTOH is messy because Clang uses 'g' for its 128-bit
51 // long double.
52 char* p = abi::__cxa_demangle("1\006ILeeeEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE", 0, 0, 0);
53 if (p && !strcmp(p, "\x6<-0x1.cecececececececececececececep+11983")) {
54 // Prior to llvm.org/D77924, libc++abi left off the "L>" suffix.
55 } else if (p && !strcmp(p, "\x6<-0x1.cecececececececececececececep+11983L>")) {
56 // After llvm.org/D77924, the "L>" suffix is present. libc++abi
57 // accepts A-F digits but decodes each using (digit - 'a' + 10), turning 'E'
58 // into -18.
59 } else {
60 // TODO: Remove the other accepted outputs, because libc++abi probably
61 // should reject this input.
62 ASSERT_EQ(nullptr, p) << p;
63 }
64 free(p);
65 #endif
66 }
67
TEST(__cxa_demangle,DISABLED_cxa_demangle_fuzz_167977068)68 TEST(__cxa_demangle, DISABLED_cxa_demangle_fuzz_167977068) {
69 #if defined(__aarch64__)
70 char* p = abi::__cxa_demangle("DTLeeeeeeeeeeeeeeeeeeeeeeeeeEEEEeeEEEE", 0, 0, 0);
71 ASSERT_EQ(nullptr, p) << p;
72 free(p);
73 #endif
74 }
75