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// Copyright 2018 The gVisor 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 <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <syscall.h>
#include <time.h>
#include <unistd.h>
#include "gtest/gtest.h"
#include "test/syscalls/linux/file_base.h"
#include "test/util/cleanup.h"
#include "test/util/file_descriptor.h"
#include "test/util/temp_path.h"
#include "test/util/test_util.h"
namespace gvisor {
namespace testing {
namespace {
int fallocate(int fd, int mode, off_t offset, off_t len) {
return syscall(__NR_fallocate, fd, mode, offset, len);
}
class AllocateTest : public FileTest {
void SetUp() override { FileTest::SetUp(); }
};
TEST_F(AllocateTest, Fallocate) {
// Check that it starts at size zero.
struct stat buf;
ASSERT_THAT(fstat(test_file_fd_.get(), &buf), SyscallSucceeds());
EXPECT_EQ(buf.st_size, 0);
// Grow to ten bytes.
EXPECT_THAT(fallocate(test_file_fd_.get(), 0, 0, 10), SyscallSucceeds());
ASSERT_THAT(fstat(test_file_fd_.get(), &buf), SyscallSucceeds());
EXPECT_EQ(buf.st_size, 10);
// Allocate to a smaller size should be noop.
EXPECT_THAT(fallocate(test_file_fd_.get(), 0, 0, 5), SyscallSucceeds());
ASSERT_THAT(fstat(test_file_fd_.get(), &buf), SyscallSucceeds());
EXPECT_EQ(buf.st_size, 10);
// Grow again.
EXPECT_THAT(fallocate(test_file_fd_.get(), 0, 0, 20), SyscallSucceeds());
ASSERT_THAT(fstat(test_file_fd_.get(), &buf), SyscallSucceeds());
EXPECT_EQ(buf.st_size, 20);
// Grow with offset.
EXPECT_THAT(fallocate(test_file_fd_.get(), 0, 10, 20), SyscallSucceeds());
ASSERT_THAT(fstat(test_file_fd_.get(), &buf), SyscallSucceeds());
EXPECT_EQ(buf.st_size, 30);
// Grow with offset beyond EOF.
EXPECT_THAT(fallocate(test_file_fd_.get(), 0, 39, 1), SyscallSucceeds());
ASSERT_THAT(fstat(test_file_fd_.get(), &buf), SyscallSucceeds());
EXPECT_EQ(buf.st_size, 40);
}
TEST_F(AllocateTest, FallocateInvalid) {
// Invalid FD
EXPECT_THAT(fallocate(-1, 0, 0, 10), SyscallFailsWithErrno(EBADF));
// Negative offset and size.
EXPECT_THAT(fallocate(test_file_fd_.get(), 0, -1, 10),
SyscallFailsWithErrno(EINVAL));
EXPECT_THAT(fallocate(test_file_fd_.get(), 0, 0, -1),
SyscallFailsWithErrno(EINVAL));
EXPECT_THAT(fallocate(test_file_fd_.get(), 0, -1, -1),
SyscallFailsWithErrno(EINVAL));
}
TEST_F(AllocateTest, FallocateReadonly) {
auto file = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFile());
FileDescriptor fd = ASSERT_NO_ERRNO_AND_VALUE(Open(file.path(), O_RDONLY));
EXPECT_THAT(fallocate(fd.get(), 0, 0, 10), SyscallFailsWithErrno(EBADF));
}
TEST_F(AllocateTest, FallocatePipe) {
int pipes[2];
EXPECT_THAT(pipe(pipes), SyscallSucceeds());
auto cleanup = Cleanup([&pipes] {
EXPECT_THAT(close(pipes[0]), SyscallSucceeds());
EXPECT_THAT(close(pipes[1]), SyscallSucceeds());
});
EXPECT_THAT(fallocate(pipes[1], 0, 0, 10), SyscallFailsWithErrno(ESPIPE));
}
TEST_F(AllocateTest, FallocateChar) {
const FileDescriptor fd =
ASSERT_NO_ERRNO_AND_VALUE(Open("/dev/null", O_RDWR));
EXPECT_THAT(fallocate(fd.get(), 0, 0, 10), SyscallFailsWithErrno(ENODEV));
}
TEST_F(AllocateTest, FallocateRlimit) {
// Get the current rlimit and restore after test run.
struct rlimit initial_lim;
ASSERT_THAT(getrlimit(RLIMIT_FSIZE, &initial_lim), SyscallSucceeds());
auto cleanup = Cleanup([&initial_lim] {
EXPECT_THAT(setrlimit(RLIMIT_FSIZE, &initial_lim), SyscallSucceeds());
});
// Try growing past the file size limit.
sigset_t new_mask;
sigemptyset(&new_mask);
sigaddset(&new_mask, SIGXFSZ);
sigprocmask(SIG_BLOCK, &new_mask, nullptr);
struct rlimit setlim = {};
setlim.rlim_cur = 1024;
setlim.rlim_max = RLIM_INFINITY;
ASSERT_THAT(setrlimit(RLIMIT_FSIZE, &setlim), SyscallSucceeds());
EXPECT_THAT(fallocate(test_file_fd_.get(), 0, 0, 1025),
SyscallFailsWithErrno(EFBIG));
struct timespec timelimit = {};
timelimit.tv_sec = 10;
EXPECT_EQ(sigtimedwait(&new_mask, nullptr, &timelimit), SIGXFSZ);
ASSERT_THAT(sigprocmask(SIG_UNBLOCK, &new_mask, nullptr), SyscallSucceeds());
}
} // namespace
} // namespace testing
} // namespace gvisor
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