Set a maximum limit on element recursion depth
The maximum recursion depth is set to 25. If that's not sufficient for
someone's needs, they're welcome to submit a patch that makes it
configurable.
This fixes a stack overflow found by AutoFuzz. The stack overflow was
caused by recursing too much. I've included the fuzzer's test cases in
the fuzzing/corpus directory. I've also created two (one for SimpleTag
and ChapterAtom each) additional test files, each comprised of 10,000
recursively nested elements. Manually running the fuzzer (with ASan and
UBSan) shows all inputs are now handled correctly, and no stack
overflows occur.
Change-Id: I8514259fd0788e71a58e3ccce2a0fb8a3523acfc
diff --git a/webm_parser/fuzzing/corpus/148357130d1e5ac4059ad2bb6c63d78e2523f7d2 b/webm_parser/fuzzing/corpus/148357130d1e5ac4059ad2bb6c63d78e2523f7d2
new file mode 100644
index 0000000..23129b8
--- /dev/null
+++ b/webm_parser/fuzzing/corpus/148357130d1e5ac4059ad2bb6c63d78e2523f7d2
Binary files differ
diff --git a/webm_parser/fuzzing/corpus/1df9507cc2a54a369646d6d34d846d3fcc172479 b/webm_parser/fuzzing/corpus/1df9507cc2a54a369646d6d34d846d3fcc172479
new file mode 100644
index 0000000..0826b42
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Binary files differ
diff --git a/webm_parser/fuzzing/corpus/27d62874ec87a2552e7c842da65de113aa69f7aa b/webm_parser/fuzzing/corpus/27d62874ec87a2552e7c842da65de113aa69f7aa
new file mode 100644
index 0000000..f83242a
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Binary files differ
diff --git a/webm_parser/fuzzing/corpus/2a8dda90aa286175b5c683b57fae1dc7e6ac1e7e b/webm_parser/fuzzing/corpus/2a8dda90aa286175b5c683b57fae1dc7e6ac1e7e
new file mode 100644
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Binary files differ
diff --git a/webm_parser/fuzzing/corpus/395027454c7d5babff9544414c04a39d712eed1c b/webm_parser/fuzzing/corpus/395027454c7d5babff9544414c04a39d712eed1c
new file mode 100644
index 0000000..e34ef6f
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Binary files differ
diff --git a/webm_parser/fuzzing/corpus/53c27071f53df6b8d2e5c419edf95b7792b278e7 b/webm_parser/fuzzing/corpus/53c27071f53df6b8d2e5c419edf95b7792b278e7
new file mode 100644
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\ No newline at end of file
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new file mode 100644
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new file mode 100644
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diff --git a/webm_parser/fuzzing/corpus/fa79e8ad34cabea4d3c434cc02ea1499069fcafc b/webm_parser/fuzzing/corpus/fa79e8ad34cabea4d3c434cc02ea1499069fcafc
new file mode 100644
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+++ b/webm_parser/fuzzing/corpus/fa79e8ad34cabea4d3c434cc02ea1499069fcafc
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diff --git a/webm_parser/fuzzing/webm.dict b/webm_parser/fuzzing/webm.dict
index 2aa0eb9..7660ce8 100644
--- a/webm_parser/fuzzing/webm.dict
+++ b/webm_parser/fuzzing/webm.dict
@@ -94,6 +94,12 @@
IdWhitePointChromaticityY = "\x55\xD8"
IdLuminanceMax = "\x55\xD9"
IdLuminanceMin = "\x55\xDA"
+IdProjection = "\x76\x70"
+IdProjectionType = "\x76\x71"
+IdProjectionPrivate = "\x76\x72"
+IdProjectionPoseYaw = "\x76\x73"
+IdProjectionPosePitch = "\x76\x74"
+IdProjectionPoseRoll = "\x76\x75"
IdAudio = "\xE1"
IdSamplingFrequency = "\xB5"
IdOutputSamplingFrequency = "\x78\xB5"
diff --git a/webm_parser/fuzzing/webm_fuzzer.cc b/webm_parser/fuzzing/webm_fuzzer.cc
index 1cb2228..501b151 100644
--- a/webm_parser/fuzzing/webm_fuzzer.cc
+++ b/webm_parser/fuzzing/webm_fuzzer.cc
@@ -49,7 +49,7 @@
assert(status.code != Status::kOkPartial);
// Only the following ranges have status codes defined:
- assert((-1030 <= status.code && status.code <= -1025) ||
+ assert((-1031 <= status.code && status.code <= -1025) ||
(-3 <= status.code && status.code <= 0));
return 0;
diff --git a/webm_parser/include/webm/status.h b/webm_parser/include/webm/status.h
index c0ad135..52abd38 100644
--- a/webm_parser/include/webm/status.h
+++ b/webm_parser/include/webm/status.h
@@ -87,6 +87,11 @@
*/
kInvalidElementValue = -1030,
+ /**
+ A recursive element was so deeply nested that exceeded the parser's limit.
+ */
+ kExceededRecursionDepthLimit = -1031,
+
// The following codes are internal-only and should not be used by users.
// Additionally, these codes should never be returned to the user; doing so
// is considered a bug.
diff --git a/webm_parser/src/chapter_atom_parser.h b/webm_parser/src/chapter_atom_parser.h
index d15f179..653f59f 100644
--- a/webm_parser/src/chapter_atom_parser.h
+++ b/webm_parser/src/chapter_atom_parser.h
@@ -12,7 +12,6 @@
#include "src/chapter_display_parser.h"
#include "src/int_parser.h"
#include "src/master_value_parser.h"
-#include "src/recursive_parser.h"
#include "webm/dom_types.h"
#include "webm/id.h"
@@ -23,7 +22,7 @@
// http://www.webmproject.org/docs/container/#ChapterAtom
class ChapterAtomParser : public MasterValueParser<ChapterAtom> {
public:
- ChapterAtomParser()
+ explicit ChapterAtomParser(std::size_t max_recursive_depth = 25)
: MasterValueParser<ChapterAtom>(
MakeChild<UnsignedIntParser>(Id::kChapterUid, &ChapterAtom::uid),
MakeChild<StringParser>(Id::kChapterStringUid,
@@ -34,8 +33,8 @@
&ChapterAtom::time_end),
MakeChild<ChapterDisplayParser>(Id::kChapterDisplay,
&ChapterAtom::displays),
- MakeChild<RecursiveParser<ChapterAtomParser>>(
- Id::kChapterAtom, &ChapterAtom::atoms)) {}
+ MakeChild<ChapterAtomParser>(Id::kChapterAtom, &ChapterAtom::atoms,
+ max_recursive_depth)) {}
};
} // namespace webm
diff --git a/webm_parser/src/master_value_parser.h b/webm_parser/src/master_value_parser.h
index d504cfb..841d624 100644
--- a/webm_parser/src/master_value_parser.h
+++ b/webm_parser/src/master_value_parser.h
@@ -17,6 +17,7 @@
#include <vector>
#include "src/master_parser.h"
+#include "src/recursive_parser.h"
#include "src/skip_callback.h"
#include "webm/callback.h"
#include "webm/element.h"
@@ -244,6 +245,56 @@
std::vector<Element<Value>> T::*member_;
};
+ template <typename Parser, typename... Tags>
+ class RecursiveChildFactory {
+ public:
+ constexpr RecursiveChildFactory(Id id, std::vector<Element<T>> T::*member,
+ std::size_t max_recursion_depth)
+ : id_(id), member_(member), max_recursion_depth_(max_recursion_depth) {}
+
+ // Builds a std::pair<Id, std::unique_ptr<ElementParser>>. The parent
+ // pointer must be a pointer to the MasterValueParser that is being
+ // constructed. The given value pointer must be the pointer to the fully
+ // constructed MasterValueParser::value_ object.
+ std::pair<Id, std::unique_ptr<ElementParser>> BuildParser(
+ MasterValueParser* parent, T* value) {
+ assert(parent != nullptr);
+ assert(value != nullptr);
+
+ std::vector<Element<T>>* child_member = &(value->*member_);
+ auto lambda = [child_member](RecursiveParser<Parser>* parser) {
+ if (child_member->size() == 1 && !child_member->front().is_present()) {
+ child_member->clear();
+ }
+ child_member->emplace_back(std::move(*parser->mutable_value()), true);
+ };
+
+ return {id_, std::unique_ptr<ElementParser>(
+ new ChildParser<RecursiveParser<Parser>,
+ decltype(lambda), Tags...>(
+ parent, std::move(lambda), max_recursion_depth_))};
+ }
+
+ // If called, OnParseStarted will be called on the parent element when this
+ // particular element is encountered.
+ constexpr RecursiveChildFactory<Parser, TagUseAsStart, Tags...>
+ UseAsStartEvent() const {
+ return {id_, member_, max_recursion_depth_};
+ }
+
+ // If called, OnChildParsed will be called on the parent element when this
+ // particular element is fully parsed.
+ constexpr RecursiveChildFactory<Parser, TagNotifyOnParseComplete, Tags...>
+ NotifyOnParseComplete() const {
+ return {id_, member_, max_recursion_depth_};
+ }
+
+ private:
+ Id id_;
+ std::vector<Element<T>> T::*member_;
+ std::size_t max_recursion_depth_;
+ };
+
// Constructs a new parser. Each argument must be a *ChildFactory, constructed
// from the MakeChild method.
template <typename... Args>
@@ -262,6 +313,8 @@
Id id, Element<Value> T::*member) {
static_assert(std::is_base_of<ElementParser, Parser>::value,
"Parser must derive from ElementParser");
+ static_assert(!std::is_base_of<MasterValueParser<T>, Parser>::value,
+ "Recursive elements should be contained in a std::vector");
return SingleChildFactory<Parser, Value>(id, member);
}
@@ -270,9 +323,20 @@
Id id, std::vector<Element<Value>> T::*member) {
static_assert(std::is_base_of<ElementParser, Parser>::value,
"Parser must derive from ElementParser");
+ static_assert(!std::is_base_of<MasterValueParser<T>, Parser>::value,
+ "Recursive elements require a maximum recursion depth");
return RepeatedChildFactory<Parser, Value>(id, member);
}
+ template <typename Parser>
+ static RecursiveChildFactory<Parser> MakeChild(
+ Id id, std::vector<Element<T>> T::*member,
+ std::size_t max_recursion_depth) {
+ static_assert(std::is_base_of<MasterValueParser<T>, Parser>::value,
+ "Child must be recusrive to use maximum recursion depth");
+ return RecursiveChildFactory<Parser>(id, member, max_recursion_depth);
+ }
+
// Gets the metadata for this element, setting the EBML element ID to id. Only
// call after Init() has been called.
ElementMetadata metadata(Id id) const {
diff --git a/webm_parser/src/recursive_parser.h b/webm_parser/src/recursive_parser.h
index aef49cf..1646f2f 100644
--- a/webm_parser/src/recursive_parser.h
+++ b/webm_parser/src/recursive_parser.h
@@ -27,7 +27,8 @@
template <typename T>
class RecursiveParser : public ElementParser {
public:
- RecursiveParser() = default;
+ explicit RecursiveParser(std::size_t max_recursion_depth = 25)
+ : max_recursion_depth_(max_recursion_depth){};
RecursiveParser(RecursiveParser&&) = default;
RecursiveParser& operator=(RecursiveParser&&) = default;
@@ -39,8 +40,12 @@
std::uint64_t max_size) override {
assert(metadata.size == kUnknownElementSize || metadata.size <= max_size);
+ if (max_recursion_depth_ == 0) {
+ return Status(Status::kExceededRecursionDepthLimit);
+ }
+
if (!impl_) {
- impl_.reset(new T);
+ impl_.reset(new T(max_recursion_depth_ - 1));
}
return impl_->Init(metadata, max_size);
@@ -48,8 +53,9 @@
void InitAfterSeek(const Ancestory& child_ancestory,
const ElementMetadata& child_metadata) override {
+ assert(max_recursion_depth_ > 0);
if (!impl_) {
- impl_.reset(new T);
+ impl_.reset(new T(max_recursion_depth_ - 1));
}
impl_->InitAfterSeek(child_ancestory, child_metadata);
@@ -79,6 +85,7 @@
private:
std::unique_ptr<T> impl_;
+ std::size_t max_recursion_depth_;
};
} // namespace webm
diff --git a/webm_parser/src/simple_tag_parser.h b/webm_parser/src/simple_tag_parser.h
index 8944c99..d8b9da6 100644
--- a/webm_parser/src/simple_tag_parser.h
+++ b/webm_parser/src/simple_tag_parser.h
@@ -11,7 +11,6 @@
#include "src/bool_parser.h"
#include "src/byte_parser.h"
#include "src/master_value_parser.h"
-#include "src/recursive_parser.h"
#include "webm/dom_types.h"
#include "webm/id.h"
@@ -22,15 +21,15 @@
// http://www.webmproject.org/docs/container/#SimpleTag
class SimpleTagParser : public MasterValueParser<SimpleTag> {
public:
- SimpleTagParser()
+ SimpleTagParser(std::size_t max_recursive_depth = 25)
: MasterValueParser<SimpleTag>(
MakeChild<StringParser>(Id::kTagName, &SimpleTag::name),
MakeChild<StringParser>(Id::kTagLanguage, &SimpleTag::language),
MakeChild<BoolParser>(Id::kTagDefault, &SimpleTag::is_default),
MakeChild<StringParser>(Id::kTagString, &SimpleTag::string),
MakeChild<BinaryParser>(Id::kTagBinary, &SimpleTag::binary),
- MakeChild<RecursiveParser<SimpleTagParser>>(Id::kSimpleTag,
- &SimpleTag::tags)) {}
+ MakeChild<SimpleTagParser>(Id::kSimpleTag, &SimpleTag::tags,
+ max_recursive_depth)) {}
};
} // namespace webm
diff --git a/webm_parser/tests/chapter_atom_parser_test.cc b/webm_parser/tests/chapter_atom_parser_test.cc
index 10c656a..5c82061 100644
--- a/webm_parser/tests/chapter_atom_parser_test.cc
+++ b/webm_parser/tests/chapter_atom_parser_test.cc
@@ -11,12 +11,14 @@
#include "test_utils/element_parser_test.h"
#include "webm/id.h"
+#include "webm/status.h"
using webm::ChapterAtom;
using webm::ChapterAtomParser;
using webm::ChapterDisplay;
using webm::ElementParserTest;
using webm::Id;
+using webm::Status;
namespace {
@@ -185,4 +187,23 @@
EXPECT_EQ(expected_chapter_atom, chapter_atom.atoms[0].value());
}
+TEST_F(ChapterAtomParserTest, ExceedMaxRecursionDepth) {
+ ResetParser(1);
+
+ SetReaderData({
+ 0xB6, // ID = 0xB6 (ChapterAtom).
+ 0x80, // Size = 0.
+ });
+ ParseAndVerify();
+
+ SetReaderData({
+ 0xB6, // ID = 0xB6 (ChapterAtom).
+ 0x82, // Size = 2.
+
+ 0xB6, // ID = 0xB6 (ChapterAtom).
+ 0x80, // Size = 0.
+ });
+ ParseAndExpectResult(Status::kExceededRecursionDepthLimit);
+}
+
} // namespace
diff --git a/webm_parser/tests/recursive_parser_test.cc b/webm_parser/tests/recursive_parser_test.cc
index 88af177..8965a3e 100644
--- a/webm_parser/tests/recursive_parser_test.cc
+++ b/webm_parser/tests/recursive_parser_test.cc
@@ -30,22 +30,37 @@
class FailParser : public ElementParser {
public:
- FailParser() { EXPECT_FALSE(true); }
+ explicit FailParser(std::size_t /* max_recursion_depth */) { ADD_FAILURE(); }
Status Init(const ElementMetadata& /* metadata */,
std::uint64_t /* max_size */) override {
+ ADD_FAILURE();
return Status(Status::kInvalidElementSize);
}
Status Feed(Callback* /* callback */, Reader* /* reader */,
std::uint64_t* num_bytes_read) override {
+ ADD_FAILURE();
*num_bytes_read = 0;
return Status(Status::kInvalidElementSize);
}
- int value() const { return 0; }
+ int value() const {
+ ADD_FAILURE();
+ return 0;
+ }
- int* mutable_value() { return nullptr; }
+ int* mutable_value() {
+ ADD_FAILURE();
+ return nullptr;
+ }
+};
+
+class StringParserWrapper : public StringParser {
+ public:
+ explicit StringParserWrapper(std::size_t max_recursion_depth) {
+ EXPECT_EQ(max_recursion_depth, 24);
+ }
};
class RecursiveFailParserTest
@@ -56,7 +71,7 @@
}
class RecursiveStringParserTest
- : public ElementParserTest<RecursiveParser<StringParser>> {};
+ : public ElementParserTest<RecursiveParser<StringParserWrapper>> {};
TEST_F(RecursiveStringParserTest, ParsesOkay) {
ParseAndVerify();
@@ -67,4 +82,9 @@
EXPECT_EQ("Hi", parser_.value());
}
+TEST_F(RecursiveStringParserTest, ExceedMaxRecursionDepth) {
+ ResetParser(0);
+ TestInit(0, Status::kExceededRecursionDepthLimit);
+}
+
} // namespace
diff --git a/webm_parser/tests/simple_tag_parser_test.cc b/webm_parser/tests/simple_tag_parser_test.cc
index 27931ec..f67191c 100644
--- a/webm_parser/tests/simple_tag_parser_test.cc
+++ b/webm_parser/tests/simple_tag_parser_test.cc
@@ -13,11 +13,13 @@
#include "test_utils/element_parser_test.h"
#include "webm/id.h"
+#include "webm/status.h"
using webm::ElementParserTest;
using webm::Id;
using webm::SimpleTag;
using webm::SimpleTagParser;
+using webm::Status;
namespace {
@@ -181,4 +183,23 @@
EXPECT_EQ(expected, simple_tag.tags[0].value());
}
+TEST_F(SimpleTagParserTest, ExceedMaxRecursionDepth) {
+ ResetParser(1);
+
+ SetReaderData({
+ 0x67, 0xC8, // ID = 0x67C8 (SimpleTag).
+ 0x80, // Size = 0.
+ });
+ ParseAndVerify();
+
+ SetReaderData({
+ 0x67, 0xC8, // ID = 0x67C8 (SimpleTag).
+ 0x83, // Size = 3.
+
+ 0x67, 0xC8, // ID = 0x67C8 (SimpleTag).
+ 0x80, // Size = 0.
+ });
+ ParseAndExpectResult(Status::kExceededRecursionDepthLimit);
+}
+
} // namespace
