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/*
* Copyright 2020 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
// Authors: corbin.souffrant@leviathansecurity.com
// brian.balling@leviathansecurity.com
#include <fuzzer/FuzzedDataProvider.h>
#include <helpers.h>
#include <pdx/client_channel.h>
#include <pdx/service.h>
#include <pdx/service_dispatcher.h>
#include <stddef.h>
#include <stdint.h>
#include <sys/eventfd.h>
#include <thread>
using namespace android::pdx;
// Fuzzer for Message object functions.
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
FuzzedDataProvider fdp = FuzzedDataProvider(data, size);
FuzzEndpoint* endpoint = new FuzzEndpoint(&fdp);
std::shared_ptr<Service> service(
new Service("FuzzService", std::unique_ptr<Endpoint>(endpoint)));
std::shared_ptr<Channel> channel(nullptr);
// Generate a random Message object to call functions in.
MessageInfo info;
info.pid = fdp.ConsumeIntegral<int>();
info.tid = fdp.ConsumeIntegral<int>();
info.cid = fdp.ConsumeIntegral<int>();
info.mid = fdp.ConsumeIntegral<int>();
info.euid = fdp.ConsumeIntegral<int>();
info.egid = fdp.ConsumeIntegral<int>();
info.op = fdp.ConsumeIntegral<int32_t>();
info.flags = fdp.ConsumeIntegral<uint32_t>();
info.service = service.get();
info.channel = channel.get();
info.send_len = fdp.ConsumeIntegral<size_t>();
info.recv_len = fdp.ConsumeIntegral<size_t>();
info.fd_count = fdp.ConsumeIntegral<size_t>();
if (fdp.remaining_bytes() >= 32) {
std::vector<uint8_t> impulse_vec = fdp.ConsumeBytes<uint8_t>(32);
memcpy(info.impulse, impulse_vec.data(), 32);
}
Message message = Message(info);
// A bunch of getters that probably won't do much, but might as well
// get coverage, while we are here.
message.GetProcessId();
message.GetThreadId();
message.GetEffectiveUserId();
message.GetEffectiveGroupId();
message.GetChannelId();
message.GetMessageId();
message.GetOp();
message.GetFlags();
message.GetSendLength();
message.GetReceiveLength();
message.GetFileDescriptorCount();
message.ImpulseEnd();
message.replied();
message.IsChannelExpired();
message.IsServiceExpired();
message.GetState();
message.GetState();
// Some misc. functions.
unsigned int fd = fdp.ConsumeIntegral<unsigned int>();
int clear_mask = fdp.ConsumeIntegral<int>();
int set_mask = fdp.ConsumeIntegral<int>();
Status<void> status = {};
message.ModifyChannelEvents(clear_mask, set_mask);
// Fuzz the handle functions.
LocalHandle l_handle = {};
BorrowedHandle b_handle = {};
RemoteHandle r_handle = {};
LocalChannelHandle lc_handle = {};
BorrowedChannelHandle bc_handle = {};
RemoteChannelHandle rc_handle = {};
FileReference f_ref = fdp.ConsumeIntegral<int32_t>();
ChannelReference c_ref = fdp.ConsumeIntegral<int32_t>();
// These don't actually modify any state in the Message or params.
// They can be called in any order.
message.PushFileHandle(b_handle);
message.PushFileHandle(r_handle);
message.PushChannelHandle(lc_handle);
message.PushChannelHandle(bc_handle);
message.PushChannelHandle(rc_handle);
message.GetFileHandle(f_ref, &l_handle);
message.GetChannelHandle(c_ref, &lc_handle);
// Can only reply once, pick at random.
switch (fdp.ConsumeIntegral<uint8_t>()) {
case 0:
message.ReplyFileDescriptor(fd);
break;
case 1:
message.Reply(status);
break;
case 2:
message.Reply(l_handle);
break;
case 3:
message.Reply(b_handle);
break;
case 4:
message.Reply(r_handle);
break;
case 5:
message.Reply(lc_handle);
break;
case 6:
message.Reply(bc_handle);
break;
case 7:
message.Reply(rc_handle);
}
// Fuzz the channel functions.
int flags = fdp.ConsumeIntegral<int>();
int channel_id = 0;
message.PushChannel(flags, channel, &channel_id);
message.CheckChannel(service.get(), c_ref, &channel);
message.CheckChannel(c_ref, &channel);
message.PushChannel(service.get(), flags, channel, &channel_id);
size_t iovec_size = sizeof(iovec);
struct iovec* iovecs = nullptr;
// Fuzz the read/write functions. Needs at least one iovec, plus one byte.
if (fdp.remaining_bytes() >= iovec_size + 1) {
std::vector<uint8_t> tmp_vec = fdp.ConsumeBytes<uint8_t>(iovec_size);
struct iovec* vector = reinterpret_cast<struct iovec*>(tmp_vec.data());
std::vector<uint8_t> tmp_buf =
fdp.ConsumeBytes<uint8_t>(fdp.remaining_bytes());
void* buf = reinterpret_cast<void*>(tmp_buf.data());
size_t buf_size = fdp.ConsumeIntegral<size_t>();
// Capping num_vecs to 1024 so it doesn't allocate too much memory.
size_t num_vecs = fdp.ConsumeIntegralInRange<size_t>(0, 1024);
if (num_vecs > 0)
iovecs = new struct iovec[num_vecs];
for (size_t i = 0; i < num_vecs; i++) {
iovecs[i] = *vector;
}
message.ReadAll(vector, buf_size);
message.WriteAll(buf, buf_size);
message.ReadVectorAll(vector, num_vecs);
message.WriteVectorAll(vector, num_vecs);
message.ReadVector(vector, buf_size);
message.WriteVector(vector, buf_size);
}
if (iovecs != nullptr)
delete[] iovecs;
return 0;
}
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