[libcxxabi] r278579 - Fix ASAN failures in the demangler
Hans Wennborg via cfe-commits
cfe-commits at lists.llvm.org
Mon Aug 15 09:18:18 PDT 2016
Merged in r278675. Thanks!
On Fri, Aug 12, 2016 at 5:54 PM, Mehdi Amini <mehdi.amini at apple.com> wrote:
> CC hans.
>
>
>> On Aug 12, 2016, at 5:50 PM, Duncan P. N. Exon Smith <dexonsmith at apple.com> wrote:
>>
>> This seems like a good candidate to cherry-pick to 3.9.
>>
>>> On 2016-Aug-12, at 17:02, Mehdi Amini via cfe-commits <cfe-commits at lists.llvm.org> wrote:
>>>
>>> Author: mehdi_amini
>>> Date: Fri Aug 12 19:02:33 2016
>>> New Revision: 278579
>>>
>>> URL: http://llvm.org/viewvc/llvm-project?rev=278579&view=rev
>>> Log:
>>> Fix ASAN failures in the demangler
>>>
>>> These were found fuzzing with ASAN.
>>>
>>> Modified:
>>> libcxxabi/trunk/src/cxa_demangle.cpp
>>> libcxxabi/trunk/test/test_demangle.pass.cpp
>>>
>>> Modified: libcxxabi/trunk/src/cxa_demangle.cpp
>>> URL: http://llvm.org/viewvc/llvm-project/libcxxabi/trunk/src/cxa_demangle.cpp?rev=278579&r1=278578&r2=278579&view=diff
>>> ==============================================================================
>>> --- libcxxabi/trunk/src/cxa_demangle.cpp (original)
>>> +++ libcxxabi/trunk/src/cxa_demangle.cpp Fri Aug 12 19:02:33 2016
>>> @@ -624,6 +624,8 @@ parse_const_cast_expr(const char* first,
>>> return first;
>>> auto expr = db.names.back().move_full();
>>> db.names.pop_back();
>>> + if (db.names.empty())
>>> + return first;
>>> db.names.back() = "const_cast<" + db.names.back().move_full() + ">(" + expr + ")";
>>> first = t1;
>>> }
>>> @@ -650,6 +652,8 @@ parse_dynamic_cast_expr(const char* firs
>>> return first;
>>> auto expr = db.names.back().move_full();
>>> db.names.pop_back();
>>> + if (db.names.empty())
>>> + return first;
>>> db.names.back() = "dynamic_cast<" + db.names.back().move_full() + ">(" + expr + ")";
>>> first = t1;
>>> }
>>> @@ -676,6 +680,8 @@ parse_reinterpret_cast_expr(const char*
>>> return first;
>>> auto expr = db.names.back().move_full();
>>> db.names.pop_back();
>>> + if (db.names.empty())
>>> + return first;
>>> db.names.back() = "reinterpret_cast<" + db.names.back().move_full() + ">(" + expr + ")";
>>> first = t1;
>>> }
>>> @@ -1294,6 +1300,8 @@ parse_dot_expr(const char* first, const
>>> return first;
>>> auto name = db.names.back().move_full();
>>> db.names.pop_back();
>>> + if (db.names.empty())
>>> + return first;
>>> db.names.back().first += "." + name;
>>> first = t1;
>>> }
>>> @@ -2896,6 +2904,8 @@ base_name(String& s)
>>> ++c;
>>> }
>>> }
>>> + if (pe - pf <= 1)
>>> + return String();
>>> const char* p0 = pe - 1;
>>> for (; p0 != pf; --p0)
>>> {
>>> @@ -3016,7 +3026,8 @@ parse_unnamed_type_name(const char* firs
>>> const char* t1 = parse_type(t0, last, db);
>>> if (t1 == t0)
>>> {
>>> - db.names.pop_back();
>>> + if(!db.names.empty())
>>> + db.names.pop_back();
>>> return first;
>>> }
>>> if (db.names.size() < 2)
>>> @@ -3041,17 +3052,21 @@ parse_unnamed_type_name(const char* firs
>>> }
>>> t0 = t1;
>>> }
>>> + if(db.names.empty())
>>> + return first;
>>> db.names.back().first.append(")");
>>> }
>>> if (t0 == last || *t0 != 'E')
>>> {
>>> + if(!db.names.empty())
>>> db.names.pop_back();
>>> return first;
>>> }
>>> ++t0;
>>> if (t0 == last)
>>> {
>>> - db.names.pop_back();
>>> + if(!db.names.empty())
>>> + db.names.pop_back();
>>> return first;
>>> }
>>> if (std::isdigit(*t0))
>>> @@ -3064,7 +3079,8 @@ parse_unnamed_type_name(const char* firs
>>> }
>>> if (t0 == last || *t0 != '_')
>>> {
>>> - db.names.pop_back();
>>> + if(!db.names.empty())
>>> + db.names.pop_back();
>>> return first;
>>> }
>>> first = t0 + 1;
>>> @@ -3251,7 +3267,7 @@ parse_binary_expression(const char* firs
>>> nm += ')';
>>> first = t2;
>>> }
>>> - else
>>> + else if(!db.names.empty())
>>> db.names.pop_back();
>>> }
>>> return first;
>>> @@ -3490,7 +3506,7 @@ parse_expression(const char* first, cons
>>> db.names.back() = "(" + op1 + ")[" + op2 + "]";
>>> first = t2;
>>> }
>>> - else
>>> + else if (!db.names.empty())
>>> db.names.pop_back();
>>> }
>>> }
>>> @@ -3686,11 +3702,13 @@ parse_expression(const char* first, cons
>>> }
>>> else
>>> {
>>> + if (db.names.size() < 2)
>>> + return first;
>>> db.names.pop_back();
>>> db.names.pop_back();
>>> }
>>> }
>>> - else
>>> + else if (!db.names.empty())
>>> db.names.pop_back();
>>> }
>>> }
>>> @@ -3879,8 +3897,9 @@ parse_template_args(const char* first, c
>>> args += ", ";
>>> args += db.names[k].move_full();
>>> }
>>> - for (; k1 != k0; --k1)
>>> - db.names.pop_back();
>>> + for (; k1 > k0; --k1)
>>> + if (!db.names.empty())
>>> + db.names.pop_back();
>>> t = t1;
>>> }
>>> first = t + 1;
>>> @@ -3959,6 +3978,8 @@ parse_nested_name(const char* first, con
>>> {
>>> auto name = db.names.back().move_full();
>>> db.names.pop_back();
>>> + if (db.names.empty())
>>> + return first;
>>> if (!db.names.back().first.empty())
>>> {
>>> db.names.back().first += "::" + name;
>>> @@ -3978,6 +3999,8 @@ parse_nested_name(const char* first, con
>>> {
>>> auto name = db.names.back().move_full();
>>> db.names.pop_back();
>>> + if (db.names.empty())
>>> + return first;
>>> if (!db.names.back().first.empty())
>>> db.names.back().first += "::" + name;
>>> else
>>> @@ -3997,6 +4020,8 @@ parse_nested_name(const char* first, con
>>> {
>>> auto name = db.names.back().move_full();
>>> db.names.pop_back();
>>> + if (db.names.empty())
>>> + return first;
>>> if (!db.names.back().first.empty())
>>> db.names.back().first += "::" + name;
>>> else
>>> @@ -4014,6 +4039,8 @@ parse_nested_name(const char* first, con
>>> {
>>> auto name = db.names.back().move_full();
>>> db.names.pop_back();
>>> + if (db.names.empty())
>>> + return first;
>>> db.names.back().first += name;
>>> db.subs.push_back(typename C::sub_type(1, db.names.back(), db.names.get_allocator()));
>>> t0 = t1;
>>> @@ -4033,6 +4060,8 @@ parse_nested_name(const char* first, con
>>> {
>>> auto name = db.names.back().move_full();
>>> db.names.pop_back();
>>> + if (db.names.empty())
>>> + return first;
>>> if (!db.names.back().first.empty())
>>> db.names.back().first += "::" + name;
>>> else
>>> @@ -4130,11 +4159,13 @@ parse_local_name(const char* first, cons
>>> return first;
>>> auto name = db.names.back().move_full();
>>> db.names.pop_back();
>>> + if (db.names.empty())
>>> + return first;
>>> db.names.back().first.append("::");
>>> db.names.back().first.append(name);
>>> first = t1;
>>> }
>>> - else
>>> + else if (!db.names.empty())
>>> db.names.pop_back();
>>> }
>>> }
>>> @@ -4151,10 +4182,12 @@ parse_local_name(const char* first, cons
>>> return first;
>>> auto name = db.names.back().move_full();
>>> db.names.pop_back();
>>> + if (db.names.empty())
>>> + return first;
>>> db.names.back().first.append("::");
>>> db.names.back().first.append(name);
>>> }
>>> - else
>>> + else if (!db.names.empty())
>>> db.names.pop_back();
>>> }
>>> break;
>>> @@ -4219,6 +4252,8 @@ parse_name(const char* first, const char
>>> return first;
>>> auto tmp = db.names.back().move_full();
>>> db.names.pop_back();
>>> + if (db.names.empty())
>>> + return first;
>>> db.names.back().first += tmp;
>>> first = t1;
>>> if (ends_with_template_args)
>>> @@ -4241,6 +4276,8 @@ parse_name(const char* first, const char
>>> return first;
>>> auto tmp = db.names.back().move_full();
>>> db.names.pop_back();
>>> + if (db.names.empty())
>>> + return first;
>>> db.names.back().first += tmp;
>>> first = t1;
>>> if (ends_with_template_args)
>>> @@ -4399,6 +4436,8 @@ parse_special_name(const char* first, co
>>> return first;
>>> auto left = db.names.back().move_full();
>>> db.names.pop_back();
>>> + if (db.names.empty())
>>> + return first;
>>> db.names.back().first = "construction vtable for " +
>>> std::move(left) + "-in-" +
>>> db.names.back().move_full();
>>> @@ -4538,6 +4577,9 @@ parse_encoding(const char* first, const
>>> if (ret2.empty())
>>> ret1 += ' ';
>>> db.names.pop_back();
>>> + if (db.names.empty())
>>> + return first;
>>> +
>>> db.names.back().first.insert(0, ret1);
>>> t = t2;
>>> }
>>> @@ -4565,8 +4607,11 @@ parse_encoding(const char* first, const
>>> tmp += ", ";
>>> tmp += db.names[k].move_full();
>>> }
>>> - for (size_t k = k0; k < k1; ++k)
>>> + for (size_t k = k0; k < k1; ++k) {
>>> + if (db.names.empty())
>>> + return first;
>>> db.names.pop_back();
>>> + }
>>> if (!tmp.empty())
>>> {
>>> if (db.names.empty())
>>>
>>> Modified: libcxxabi/trunk/test/test_demangle.pass.cpp
>>> URL: http://llvm.org/viewvc/llvm-project/libcxxabi/trunk/test/test_demangle.pass.cpp?rev=278579&r1=278578&r2=278579&view=diff
>>> ==============================================================================
>>> --- libcxxabi/trunk/test/test_demangle.pass.cpp (original)
>>> +++ libcxxabi/trunk/test/test_demangle.pass.cpp Fri Aug 12 19:02:33 2016
>>> @@ -29591,6 +29591,7 @@ const char* cases[][2] =
>>> {"_ZZ4testvEN1g3fooE5Point", "test()::g::foo(Point)"},
>>> {"_ZThn12_NSt9strstreamD0Ev", "non-virtual thunk to std::strstream::~strstream()"},
>>> {"_ZTv0_n12_NSt9strstreamD0Ev", "virtual thunk to std::strstream::~strstream()"},
>>> + {"\x6D", "unsigned long"}, // This use to crash with ASAN
>>> };
>>>
>>> const unsigned N = sizeof(cases) / sizeof(cases[0]);
>>> @@ -29636,6 +29637,21 @@ const char* invalid_cases[] =
>>> #if !LDBL_FP80
>>> "_ZN5test01hIfEEvRAcvjplstT_Le4001a000000000000000E_c",
>>> #endif
>>> + // The following test cases were found by libFuzzer+ASAN
>>> + "\x44\x74\x70\x74\x71\x75\x34\x43\x41\x72\x4D\x6E\x65\x34\x9F\xC1\x43\x41\x72\x4D\x6E\x77\x38\x9A\x8E\x44\x6F\x64\x6C\x53\xF9\x5F\x70\x74\x70\x69\x45\x34\xD3\x73\x9E\x2A\x37",
>>> + "\x4D\x41\x72\x63\x4E\x39\x44\x76\x72\x4D\x34\x44\x53\x4B\x6F\x44\x54\x6E\x61\x37\x47\x77\x78\x38\x43\x27\x41\x5F\x73\x70\x69\x45*",
>>> + "\x41\x64\x6E\x32*",
>>> + "\x43\x46\x41\x67\x73*",
>>> + "\x72\x3A\x4E\x53\x64\x45\x39\x4F\x52\x4E\x1F\x43\x34\x64\x54\x5F\x49\x31\x41\x63\x6C\x37\x2A\x4D\x41\x67\x73\x76\x43\x54\x35\x5F\x49\x4B\x4C\x55\x6C\x73\x4C\x38\x64\x43\x41\x47\x4C\x5A\x28\x4F\x41\x6E\x77\x5F\x53\x6F\x70\x69\x45\x5F\x63\x47\x61\x4C\x31\x4F\x4C\x33\x3E\x41\x4C\x4B\x4C\x55\x6C\x73\x4C\x38\x64\x43\x66\x41\x47\x4C\x5A\x28\x4F\x41\x6E\x77\x5F\x53\x6F\x70\x69\x45\x5F\x37\x41*",
>>> + "\x2D\x5F\x63\x47\x4F\x63\xD3",
>>> + "\x44\x74\x70\x74\x71\x75\x32\x43\x41\x38\x65\x6E\x9B\x72\x4D\xC1\x43\x41\x72\x4D\x6E\x77\x38\x9A\x8E\x44\x6F\x64\xC3\x53\xF9\x5F\x70\x74\x70\x69\x45\x38\xD3\x73\x9E\x2A\x37",
>>> + "\x4C\x5A\x4C\x55\x6C\x4D\x41\x5F\x41\x67\x74\x71\x75\x34\x4D\x41\x64\x73\x4C\x44\x76\x72\x4D\x34\x44\x4B\x44\x54\x6E\x61\x37\x47\x77\x78\x38\x43\x27\x41\x5F\x73\x70\x69\x45\x6D\x73\x72\x53\x41\x6F\x41\x7B",
>>> + "\x44\x74\x70\x74\x71\x75\x32\x43\x41\x38\x65\x6E\x9B\x72\x4D\xC1\x43\x41\x72\x4D\x6E\x77\x38\x9A\x8E\x44\x6F\x64\x2C\x53\xF9\x5F\x70\x74\x70\x69\x45\xB4\xD3\x73\x9F\x2A\x37",
>>> + "\x4C\x5A\x4C\x55\x6C\x69\x4D\x73\x72\x53\x6F\x7A\x41\x5F\x41\x67\x74\x71\x75\x32\x4D\x41\x64\x73\x39\x28\x76\x72\x4D\x34\x44\x4B\x45\x54\x6E\x61\x37\x47\x77\x78\x38\x43\x27\x41\x5F\x73\x70\x69\x45\x6F\x45\x49\x6D\x1A\x4C\x53\x38\x6A\x7A\x5A",
>>> + "\x44\x74\x63*",
>>> + "\x44\x74\x71\x75\x35\x2A\xDF\x74\x44\x61\x73\x63\x35\x2A\x3B\x41\x72\x4D\x6E\x65\x34\x9F\xC1\x63\x41\x72\x4D\x6E\x77\x38\x9A\x8E\x44\x6F\x64\x6C\x53\xF9\x5F\x70\x74\x70\x69\x45\x33\x44\x76\x35",
>>> + "\x44\x74\x70\x74\x71\x75\x32\x43\x41\x38\x65\x6E\x9B\x72\x4D\xC1\x43\x41\x72\x4D\x6E\x77\x38\x9A\x8E\x44\x6F\x64\x6C\x53\xF9\x5F\x70\x74\x70\x69\x45\x38\xD3\x73\x9E\x2A\x37",
>>> + "\x46\x44\x74\x70\x74\x71\x75\x32\x43\x41\x72\x4D\x6E\x65\x34\x9F\xC1\x43\x41\x72\x4D\x6E\x77\x38\x9A\x8E\x44\x6F\x64\x6C\x53\xF9\x5F\x70\x74\x70\x69\x45\x34\xD3\x73\x9E\x2A\x37\x72\x33\x8E\x3A\x29\x8E\x44\x35",
>>> };
>>>
>>> const unsigned NI = sizeof(invalid_cases) / sizeof(invalid_cases[0]);
>>>
>>>
>>> _______________________________________________
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>>
>
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