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/*
* Copyright (C) 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.
*/
#include <fuzzbinder/random_fd.h>
#include <fcntl.h>
#include <android-base/logging.h>
#include <cutils/ashmem.h>
namespace android {
using binder::unique_fd;
std::vector<unique_fd> getRandomFds(FuzzedDataProvider* provider) {
const char* fdType;
std::vector<unique_fd> fds = provider->PickValueInArray<
std::function<std::vector<unique_fd>()>>(
{[&]() {
fdType = "ashmem";
std::vector<unique_fd> ret;
ret.push_back(unique_fd(
ashmem_create_region("binder test region",
provider->ConsumeIntegralInRange<size_t>(0, 4096))));
return ret;
},
[&]() {
fdType = "/dev/null";
std::vector<unique_fd> ret;
ret.push_back(unique_fd(open("/dev/null", O_RDWR)));
return ret;
},
[&]() {
fdType = "pipefd";
int pipefds[2];
int flags = O_CLOEXEC;
if (provider->ConsumeBool()) flags |= O_DIRECT;
// TODO(b/236812909): also test blocking
if (true) flags |= O_NONBLOCK;
CHECK_EQ(0, pipe2(pipefds, flags)) << flags;
if (provider->ConsumeBool()) std::swap(pipefds[0], pipefds[1]);
std::vector<unique_fd> ret;
ret.push_back(unique_fd(pipefds[0]));
ret.push_back(unique_fd(pipefds[1]));
return ret;
},
[&]() {
fdType = "tempfd";
char name[PATH_MAX];
#if defined(__ANDROID__)
snprintf(name, sizeof(name), "/data/local/tmp/android-tempfd-test-%d-XXXXXX",
getpid());
#else
snprintf(name, sizeof(name), "/tmp/android-tempfd-test-%d-XXXXXX", getpid());
#endif
int fd = mkstemp(name);
CHECK_NE(fd, -1) << "Failed to create file " << name << ", errno: " << errno;
unlink(name);
if (provider->ConsumeBool()) {
CHECK_NE(TEMP_FAILURE_RETRY(
ftruncate(fd,
provider->ConsumeIntegralInRange<size_t>(0, 4096))),
-1)
<< "Failed to truncate file, errno: " << errno;
}
std::vector<unique_fd> ret;
ret.push_back(unique_fd(fd));
return ret;
}
})();
for (const auto& fd : fds) CHECK(fd.ok()) << fd.get() << " " << fdType;
return fds;
}
} // namespace android
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