146 lines
4.9 KiB
C++
146 lines
4.9 KiB
C++
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <errno.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <sys/resource.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <time.h>
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#include <unistd.h>
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#include "gmock/gmock.h"
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#include "gtest/gtest.h"
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#include "test/util/cleanup.h"
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#include "test/util/temp_path.h"
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#include "test/util/test_util.h"
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namespace gvisor {
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namespace testing {
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namespace {
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// This test is currently very rudimentary.
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//
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// TODO(edahlgren):
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// * bad buffer states (EFAULT).
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// * bad fds (wrong permission, wrong type of file, EBADF).
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// * check offset is incremented.
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// * check for EOF.
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// * writing to pipes, symlinks, special files.
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class WriteTest : public ::testing::Test {
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public:
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ssize_t WriteBytes(int fd, int bytes) {
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std::vector<char> buf(bytes);
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std::fill(buf.begin(), buf.end(), 'a');
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return WriteFd(fd, buf.data(), buf.size());
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}
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};
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TEST_F(WriteTest, WriteNoExceedsRLimit) {
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// Get the current rlimit and restore after test run.
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struct rlimit initial_lim;
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ASSERT_THAT(getrlimit(RLIMIT_FSIZE, &initial_lim), SyscallSucceeds());
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auto cleanup = Cleanup([&initial_lim] {
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EXPECT_THAT(setrlimit(RLIMIT_FSIZE, &initial_lim), SyscallSucceeds());
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});
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int fd;
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struct rlimit setlim;
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const int target_lim = 1024;
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setlim.rlim_cur = target_lim;
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setlim.rlim_max = RLIM_INFINITY;
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const std::string pathname = NewTempAbsPath();
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ASSERT_THAT(fd = open(pathname.c_str(), O_WRONLY | O_CREAT, S_IRWXU),
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SyscallSucceeds());
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ASSERT_THAT(setrlimit(RLIMIT_FSIZE, &setlim), SyscallSucceeds());
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EXPECT_THAT(WriteBytes(fd, target_lim), SyscallSucceedsWithValue(target_lim));
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std::vector<char> buf(target_lim + 1);
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std::fill(buf.begin(), buf.end(), 'a');
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EXPECT_THAT(pwrite(fd, buf.data(), target_lim, 1), SyscallSucceeds());
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EXPECT_THAT(pwrite64(fd, buf.data(), target_lim, 1), SyscallSucceeds());
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EXPECT_THAT(close(fd), SyscallSucceeds());
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}
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TEST_F(WriteTest, WriteExceedsRLimit) {
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// Get the current rlimit and restore after test run.
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struct rlimit initial_lim;
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ASSERT_THAT(getrlimit(RLIMIT_FSIZE, &initial_lim), SyscallSucceeds());
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auto cleanup = Cleanup([&initial_lim] {
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EXPECT_THAT(setrlimit(RLIMIT_FSIZE, &initial_lim), SyscallSucceeds());
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});
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int fd;
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sigset_t filesize_mask;
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sigemptyset(&filesize_mask);
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sigaddset(&filesize_mask, SIGXFSZ);
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struct rlimit setlim;
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const int target_lim = 1024;
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setlim.rlim_cur = target_lim;
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setlim.rlim_max = RLIM_INFINITY;
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const std::string pathname = NewTempAbsPath();
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ASSERT_THAT(fd = open(pathname.c_str(), O_WRONLY | O_CREAT, S_IRWXU),
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SyscallSucceeds());
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ASSERT_THAT(setrlimit(RLIMIT_FSIZE, &setlim), SyscallSucceeds());
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ASSERT_THAT(sigprocmask(SIG_BLOCK, &filesize_mask, nullptr),
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SyscallSucceeds());
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std::vector<char> buf(target_lim + 2);
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std::fill(buf.begin(), buf.end(), 'a');
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EXPECT_THAT(write(fd, buf.data(), target_lim + 1),
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SyscallSucceedsWithValue(target_lim));
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EXPECT_THAT(write(fd, buf.data(), 1), SyscallFailsWithErrno(EFBIG));
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siginfo_t info;
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struct timespec timelimit = {0, 0};
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ASSERT_THAT(RetryEINTR(sigtimedwait)(&filesize_mask, &info, &timelimit),
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SyscallSucceedsWithValue(SIGXFSZ));
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EXPECT_EQ(info.si_code, SI_USER);
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EXPECT_EQ(info.si_pid, getpid());
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EXPECT_EQ(info.si_uid, getuid());
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EXPECT_THAT(pwrite(fd, buf.data(), target_lim + 1, 1),
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SyscallSucceedsWithValue(target_lim - 1));
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EXPECT_THAT(pwrite(fd, buf.data(), 1, target_lim),
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SyscallFailsWithErrno(EFBIG));
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ASSERT_THAT(RetryEINTR(sigtimedwait)(&filesize_mask, &info, &timelimit),
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SyscallSucceedsWithValue(SIGXFSZ));
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EXPECT_EQ(info.si_code, SI_USER);
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EXPECT_EQ(info.si_pid, getpid());
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EXPECT_EQ(info.si_uid, getuid());
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EXPECT_THAT(pwrite64(fd, buf.data(), target_lim + 1, 1),
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SyscallSucceedsWithValue(target_lim - 1));
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EXPECT_THAT(pwrite64(fd, buf.data(), 1, target_lim),
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SyscallFailsWithErrno(EFBIG));
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ASSERT_THAT(RetryEINTR(sigtimedwait)(&filesize_mask, &info, &timelimit),
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SyscallSucceedsWithValue(SIGXFSZ));
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EXPECT_EQ(info.si_code, SI_USER);
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EXPECT_EQ(info.si_pid, getpid());
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EXPECT_EQ(info.si_uid, getuid());
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ASSERT_THAT(sigprocmask(SIG_UNBLOCK, &filesize_mask, nullptr),
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SyscallSucceeds());
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EXPECT_THAT(close(fd), SyscallSucceeds());
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}
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} // namespace
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} // namespace testing
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} // namespace gvisor
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