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// Copyright 2021 gRPC authors.
//
// 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.
#include <stdint.h>
#include <sys/types.h>
#include <functional>
#include <limits>
#include <map>
#include <memory>
#include <utility>
#include "absl/status/status.h"
#include "absl/strings/str_cat.h"
#include "absl/types/optional.h"
#include <grpc/event_engine/memory_allocator.h>
#include <grpc/event_engine/memory_request.h>
#include <grpc/support/log.h>
#include "src/core/lib/debug/trace.h"
#include "src/core/lib/experiments/config.h"
#include "src/core/lib/gpr/useful.h"
#include "src/core/lib/gprpp/debug_location.h"
#include "src/core/lib/iomgr/closure.h"
#include "src/core/lib/iomgr/error.h"
#include "src/core/lib/iomgr/exec_ctx.h"
#include "src/core/lib/resource_quota/memory_quota.h"
#include "src/libfuzzer/libfuzzer_macro.h"
#include "test/core/resource_quota/call_checker.h"
#include "test/core/resource_quota/memory_quota_fuzzer.pb.h"
#include "test/core/util/fuzz_config_vars.h"
bool squelch = true;
bool leak_check = true;
namespace grpc_core {
namespace testing {
namespace {
ReclamationPass MapReclamationPass(memory_quota_fuzzer::Reclaimer::Pass pass) {
switch (pass) {
case memory_quota_fuzzer::Reclaimer::BENIGN:
return ReclamationPass::kBenign;
case memory_quota_fuzzer::Reclaimer::IDLE:
return ReclamationPass::kIdle;
case memory_quota_fuzzer::Reclaimer::DESTRUCTIVE:
return ReclamationPass::kDestructive;
default:
return ReclamationPass::kBenign;
}
}
class Fuzzer {
public:
void Run(const memory_quota_fuzzer::Msg& msg) {
ExecCtx exec_ctx;
RunMsg(msg);
do {
memory_quotas_.clear();
memory_allocators_.clear();
allocations_.clear();
exec_ctx.Flush();
} while (!memory_quotas_.empty() || !memory_allocators_.empty() ||
!allocations_.empty());
}
private:
void RunMsg(const memory_quota_fuzzer::Msg& msg) {
for (int i = 0; i < msg.actions_size(); ++i) {
const auto& action = msg.actions(i);
switch (action.action_type_case()) {
case memory_quota_fuzzer::Action::kFlushExecCtx:
ExecCtx::Get()->Flush();
break;
case memory_quota_fuzzer::Action::kCreateQuota:
memory_quotas_.emplace(action.quota(),
MemoryQuota(absl::StrCat("quota-step-", i)));
break;
case memory_quota_fuzzer::Action::kDeleteQuota:
memory_quotas_.erase(action.quota());
break;
case memory_quota_fuzzer::Action::kCreateAllocator:
WithQuota(action.quota(), [this, action, i](MemoryQuota* q) {
memory_allocators_.emplace(
action.allocator(),
q->CreateMemoryOwner(absl::StrCat("allocator-step-", i)));
});
break;
case memory_quota_fuzzer::Action::kDeleteAllocator:
memory_allocators_.erase(action.allocator());
break;
case memory_quota_fuzzer::Action::kSetQuotaSize:
WithQuota(action.quota(), [action](MemoryQuota* q) {
q->SetSize(Clamp(action.set_quota_size(), uint64_t{0},
uint64_t{std::numeric_limits<ssize_t>::max()}));
});
break;
case memory_quota_fuzzer::Action::kCreateAllocation: {
auto min = action.create_allocation().min();
auto max = action.create_allocation().max();
if (min > max) break;
if (max > MemoryRequest::max_allowed_size()) break;
MemoryRequest req(min, max);
WithAllocator(
action.allocator(), [this, action, req](MemoryOwner* a) {
auto alloc = a->MakeReservation(req);
allocations_.emplace(action.allocation(), std::move(alloc));
});
} break;
case memory_quota_fuzzer::Action::kDeleteAllocation:
allocations_.erase(action.allocation());
break;
case memory_quota_fuzzer::Action::kPostReclaimer: {
std::function<void(absl::optional<ReclamationSweep>)> reclaimer;
auto cfg = action.post_reclaimer();
if (cfg.synchronous()) {
reclaimer = [this, cfg](absl::optional<ReclamationSweep>) {
RunMsg(cfg.msg());
};
} else {
reclaimer = [cfg, this](absl::optional<ReclamationSweep> sweep) {
struct Args {
absl::optional<ReclamationSweep> sweep;
memory_quota_fuzzer::Msg msg;
Fuzzer* fuzzer;
};
auto* args = new Args{std::move(sweep), cfg.msg(), this};
auto* closure = GRPC_CLOSURE_CREATE(
[](void* arg, grpc_error_handle) {
auto* args = static_cast<Args*>(arg);
args->fuzzer->RunMsg(args->msg);
delete args;
},
args, nullptr);
ExecCtx::Get()->Run(DEBUG_LOCATION, closure, absl::OkStatus());
};
auto pass = MapReclamationPass(cfg.pass());
WithAllocator(
action.allocator(), [pass, reclaimer](MemoryOwner* a) {
// ensure called exactly once
auto call_checker = CallChecker::MakeOptional();
a->PostReclaimer(pass,
[reclaimer, call_checker](
absl::optional<ReclamationSweep> sweep) {
call_checker->Called();
reclaimer(std::move(sweep));
});
});
}
} break;
case memory_quota_fuzzer::Action::ACTION_TYPE_NOT_SET:
break;
}
}
}
template <typename F>
void WithQuota(int quota, F f) {
auto it = memory_quotas_.find(quota);
if (it == memory_quotas_.end()) return;
f(&it->second);
}
template <typename F>
void WithAllocator(int allocator, F f) {
auto it = memory_allocators_.find(allocator);
if (it == memory_allocators_.end()) return;
f(&it->second);
}
std::map<int, MemoryQuota> memory_quotas_;
std::map<int, MemoryOwner> memory_allocators_;
std::map<int, MemoryAllocator::Reservation> allocations_;
};
} // namespace
} // namespace testing
} // namespace grpc_core
static void dont_log(gpr_log_func_args* /*args*/) {}
DEFINE_PROTO_FUZZER(const memory_quota_fuzzer::Msg& msg) {
if (squelch) gpr_set_log_function(dont_log);
grpc_core::ApplyFuzzConfigVars(msg.config_vars());
grpc_core::TestOnlyReloadExperimentsFromConfigVariables();
gpr_log_verbosity_init();
grpc_tracer_init();
grpc_core::testing::Fuzzer().Run(msg);
}
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