1 files changed, 0 insertions, 542 deletions
diff --git a/test/syscalls/linux/memfd.cc b/test/syscalls/linux/memfd.cc
deleted file mode 100644
index 4a450742b..000000000
--- a/test/syscalls/linux/memfd.cc
+++ /dev/null
@@ -1,542 +0,0 @@
-// Copyright 2019 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 <linux/memfd.h>
-#include <linux/unistd.h>
-#include <string.h>
-#include <sys/mman.h>
-#include <sys/syscall.h>
-
-#include <vector>
-
-#include "gtest/gtest.h"
-#include "test/util/file_descriptor.h"
-#include "test/util/fs_util.h"
-#include "test/util/memory_util.h"
-#include "test/util/multiprocess_util.h"
-#include "test/util/temp_path.h"
-#include "test/util/test_util.h"
-
-namespace gvisor {
-namespace testing {
-namespace {
-
-// The header sys/memfd.h isn't available on all systems, so redefining some of
-// the constants here.
-#define F_LINUX_SPECIFIC_BASE 1024
-
-#ifndef F_ADD_SEALS
-#define F_ADD_SEALS (F_LINUX_SPECIFIC_BASE + 9)
-#endif /* F_ADD_SEALS */
-
-#ifndef F_GET_SEALS
-#define F_GET_SEALS (F_LINUX_SPECIFIC_BASE + 10)
-#endif /* F_GET_SEALS */
-
-#define F_SEAL_SEAL 0x0001
-#define F_SEAL_SHRINK 0x0002
-#define F_SEAL_GROW 0x0004
-#define F_SEAL_WRITE 0x0008
-
-using ::gvisor::testing::IsTmpfs;
-using ::testing::StartsWith;
-
-const std::string kMemfdName = "some-memfd";
-
-int memfd_create(const std::string& name, unsigned int flags) {
-  return syscall(__NR_memfd_create, name.c_str(), flags);
-}
-
-PosixErrorOr<FileDescriptor> MemfdCreate(const std::string& name,
-                                         uint32_t flags) {
-  int fd = memfd_create(name, flags);
-  if (fd < 0) {
-    return PosixError(
-        errno, absl::StrFormat("memfd_create(\"%s\", %#x)", name, flags));
-  }
-  MaybeSave();
-  return FileDescriptor(fd);
-}
-
-// Procfs entries for memfds display the appropriate name.
-TEST(MemfdTest, Name) {
-  const FileDescriptor memfd =
-      ASSERT_NO_ERRNO_AND_VALUE(MemfdCreate(kMemfdName, 0));
-  const std::string proc_name = ASSERT_NO_ERRNO_AND_VALUE(
-      ReadLink(absl::StrFormat("/proc/self/fd/%d", memfd.get())));
-  EXPECT_THAT(proc_name, StartsWith("/memfd:" + kMemfdName));
-}
-
-// Memfds support read/write syscalls.
-TEST(MemfdTest, WriteRead) {
-  const FileDescriptor memfd =
-      ASSERT_NO_ERRNO_AND_VALUE(MemfdCreate(kMemfdName, 0));
-
-  // Write a random page of data to the memfd via write(2).
-  std::vector<char> buf(kPageSize);
-  RandomizeBuffer(buf.data(), buf.size());
-  ASSERT_THAT(write(memfd.get(), buf.data(), buf.size()),
-              SyscallSucceedsWithValue(kPageSize));
-
-  // Read back the same data and verify.
-  std::vector<char> buf2(kPageSize);
-  ASSERT_THAT(lseek(memfd.get(), 0, SEEK_SET), SyscallSucceeds());
-  EXPECT_THAT(read(memfd.get(), buf2.data(), buf2.size()),
-              SyscallSucceedsWithValue(kPageSize));
-  EXPECT_EQ(buf, buf2);
-}
-
-// Memfds can be mapped and used as usual.
-TEST(MemfdTest, Mmap) {
-  const FileDescriptor memfd =
-      ASSERT_NO_ERRNO_AND_VALUE(MemfdCreate(kMemfdName, 0));
-  const Mapping m1 = ASSERT_NO_ERRNO_AND_VALUE(Mmap(
-      nullptr, kPageSize, PROT_READ | PROT_WRITE, MAP_SHARED, memfd.get(), 0));
-
-  // Write a random page of data to the memfd via mmap m1.
-  std::vector<char> buf(kPageSize);
-  RandomizeBuffer(buf.data(), buf.size());
-  ASSERT_THAT(ftruncate(memfd.get(), kPageSize), SyscallSucceeds());
-  memcpy(m1.ptr(), buf.data(), buf.size());
-
-  // Read the data back via a read syscall on the memfd.
-  std::vector<char> buf2(kPageSize);
-  EXPECT_THAT(read(memfd.get(), buf2.data(), buf2.size()),
-              SyscallSucceedsWithValue(kPageSize));
-  EXPECT_EQ(buf, buf2);
-
-  // The same data should be accessible via a new mapping m2.
-  const Mapping m2 = ASSERT_NO_ERRNO_AND_VALUE(Mmap(
-      nullptr, kPageSize, PROT_READ | PROT_WRITE, MAP_SHARED, memfd.get(), 0));
-  EXPECT_EQ(0, memcmp(m1.ptr(), m2.ptr(), kPageSize));
-}
-
-TEST(MemfdTest, DuplicateFDsShareContent) {
-  const FileDescriptor memfd =
-      ASSERT_NO_ERRNO_AND_VALUE(MemfdCreate(kMemfdName, 0));
-  const Mapping m1 = ASSERT_NO_ERRNO_AND_VALUE(Mmap(
-      nullptr, kPageSize, PROT_READ | PROT_WRITE, MAP_SHARED, memfd.get(), 0));
-  const FileDescriptor memfd2 = ASSERT_NO_ERRNO_AND_VALUE(memfd.Dup());
-
-  // Write a random page of data to the memfd via mmap m1.
-  std::vector<char> buf(kPageSize);
-  RandomizeBuffer(buf.data(), buf.size());
-  ASSERT_THAT(ftruncate(memfd.get(), kPageSize), SyscallSucceeds());
-  memcpy(m1.ptr(), buf.data(), buf.size());
-
-  // Read the data back via a read syscall on a duplicate fd.
-  std::vector<char> buf2(kPageSize);
-  EXPECT_THAT(read(memfd2.get(), buf2.data(), buf2.size()),
-              SyscallSucceedsWithValue(kPageSize));
-  EXPECT_EQ(buf, buf2);
-}
-
-// File seals are disabled by default on memfds.
-TEST(MemfdTest, SealingDisabledByDefault) {
-  const FileDescriptor memfd =
-      ASSERT_NO_ERRNO_AND_VALUE(MemfdCreate(kMemfdName, 0));
-  EXPECT_THAT(fcntl(memfd.get(), F_GET_SEALS),
-              SyscallSucceedsWithValue(F_SEAL_SEAL));
-  // Attempting to set any seal should fail.
-  EXPECT_THAT(fcntl(memfd.get(), F_ADD_SEALS, F_SEAL_WRITE),
-              SyscallFailsWithErrno(EPERM));
-}
-
-// Seals can be retrieved and updated for memfds.
-TEST(MemfdTest, SealsGetSet) {
-  const FileDescriptor memfd =
-      ASSERT_NO_ERRNO_AND_VALUE(MemfdCreate(kMemfdName, MFD_ALLOW_SEALING));
-  int seals;
-  ASSERT_THAT(seals = fcntl(memfd.get(), F_GET_SEALS), SyscallSucceeds());
-  // No seals are set yet.
-  EXPECT_EQ(0, seals);
-
-  // Set a seal and check that we can get it back.
-  ASSERT_THAT(fcntl(memfd.get(), F_ADD_SEALS, F_SEAL_WRITE), SyscallSucceeds());
-  EXPECT_THAT(fcntl(memfd.get(), F_GET_SEALS),
-              SyscallSucceedsWithValue(F_SEAL_WRITE));
-
-  // Set some more seals and verify.
-  ASSERT_THAT(fcntl(memfd.get(), F_ADD_SEALS, F_SEAL_GROW | F_SEAL_SHRINK),
-              SyscallSucceeds());
-  EXPECT_THAT(
-      fcntl(memfd.get(), F_GET_SEALS),
-      SyscallSucceedsWithValue(F_SEAL_WRITE | F_SEAL_GROW | F_SEAL_SHRINK));
-
-  // Attempting to set a seal that is already set is a no-op.
-  ASSERT_THAT(fcntl(memfd.get(), F_ADD_SEALS, F_SEAL_WRITE), SyscallSucceeds());
-  EXPECT_THAT(
-      fcntl(memfd.get(), F_GET_SEALS),
-      SyscallSucceedsWithValue(F_SEAL_WRITE | F_SEAL_GROW | F_SEAL_SHRINK));
-
-  // Add remaining seals and verify.
-  ASSERT_THAT(fcntl(memfd.get(), F_ADD_SEALS, F_SEAL_SEAL), SyscallSucceeds());
-  EXPECT_THAT(fcntl(memfd.get(), F_GET_SEALS),
-              SyscallSucceedsWithValue(F_SEAL_WRITE | F_SEAL_GROW |
-                                       F_SEAL_SHRINK | F_SEAL_SEAL));
-}
-
-// F_SEAL_GROW prevents a memfd from being grown using ftruncate.
-TEST(MemfdTest, SealGrowWithTruncate) {
-  const FileDescriptor memfd =
-      ASSERT_NO_ERRNO_AND_VALUE(MemfdCreate(kMemfdName, MFD_ALLOW_SEALING));
-  ASSERT_THAT(ftruncate(memfd.get(), kPageSize), SyscallSucceeds());
-  ASSERT_THAT(fcntl(memfd.get(), F_ADD_SEALS, F_SEAL_GROW), SyscallSucceeds());
-
-  // Try grow the memfd by 1 page.
-  ASSERT_THAT(ftruncate(memfd.get(), kPageSize * 2),
-              SyscallFailsWithErrno(EPERM));
-
-  // Ftruncate calls that don't actually grow the memfd are allowed.
-  ASSERT_THAT(ftruncate(memfd.get(), kPageSize), SyscallSucceeds());
-  ASSERT_THAT(ftruncate(memfd.get(), kPageSize / 2), SyscallSucceeds());
-
-  // After shrinking, growing back is not allowed.
-  ASSERT_THAT(ftruncate(memfd.get(), kPageSize), SyscallFailsWithErrno(EPERM));
-}
-
-// F_SEAL_GROW prevents a memfd from being grown using the write syscall.
-TEST(MemfdTest, SealGrowWithWrite) {
-  const FileDescriptor memfd =
-      ASSERT_NO_ERRNO_AND_VALUE(MemfdCreate(kMemfdName, MFD_ALLOW_SEALING));
-
-  // Initially, writing to the memfd succeeds.
-  const std::vector<char> buf(kPageSize);
-  EXPECT_THAT(write(memfd.get(), buf.data(), buf.size()),
-              SyscallSucceedsWithValue(kPageSize));
-
-  // Apply F_SEAL_GROW, subsequent writes which extend the memfd should fail.
-  ASSERT_THAT(fcntl(memfd.get(), F_ADD_SEALS, F_SEAL_GROW), SyscallSucceeds());
-  EXPECT_THAT(write(memfd.get(), buf.data(), buf.size()),
-              SyscallFailsWithErrno(EPERM));
-
-  // However, zero-length writes are ok since they don't grow the memfd.
-  EXPECT_THAT(write(memfd.get(), buf.data(), 0), SyscallSucceeds());
-
-  // Writing to existing parts of the memfd is also ok.
-  ASSERT_THAT(lseek(memfd.get(), 0, SEEK_SET), SyscallSucceeds());
-  EXPECT_THAT(write(memfd.get(), buf.data(), buf.size()),
-              SyscallSucceedsWithValue(kPageSize));
-
-  // Returning the end of the file and writing still not allowed.
-  EXPECT_THAT(write(memfd.get(), buf.data(), buf.size()),
-              SyscallFailsWithErrno(EPERM));
-}
-
-// F_SEAL_GROW causes writes which partially extend off the current EOF to
-// partially succeed, up to the page containing the EOF.
-TEST(MemfdTest, SealGrowPartialWriteTruncated) {
-  const FileDescriptor memfd =
-      ASSERT_NO_ERRNO_AND_VALUE(MemfdCreate(kMemfdName, MFD_ALLOW_SEALING));
-  ASSERT_THAT(ftruncate(memfd.get(), kPageSize), SyscallSucceeds());
-  ASSERT_THAT(fcntl(memfd.get(), F_ADD_SEALS, F_SEAL_GROW), SyscallSucceeds());
-
-  // FD offset: 1 page, EOF: 1 page.
-
-  ASSERT_THAT(lseek(memfd.get(), kPageSize * 3 / 4, SEEK_SET),
-              SyscallSucceeds());
-
-  // FD offset: 3/4 page. Writing a full page now should only write 1/4 page
-  // worth of data. This partially succeeds because the first page is entirely
-  // within the file and requires no growth, but attempting to write the final
-  // 3/4 page would require growing the file.
-  const std::vector<char> buf(kPageSize);
-  EXPECT_THAT(write(memfd.get(), buf.data(), buf.size()),
-              SyscallSucceedsWithValue(kPageSize / 4));
-}
-
-// F_SEAL_GROW causes writes which partially extend off the current EOF to fail
-// in its entirety if the only data written would be to the page containing the
-// EOF.
-TEST(MemfdTest, SealGrowPartialWriteTruncatedSamePage) {
-  const FileDescriptor memfd =
-      ASSERT_NO_ERRNO_AND_VALUE(MemfdCreate(kMemfdName, MFD_ALLOW_SEALING));
-  ASSERT_THAT(ftruncate(memfd.get(), kPageSize * 3 / 4), SyscallSucceeds());
-  ASSERT_THAT(fcntl(memfd.get(), F_ADD_SEALS, F_SEAL_GROW), SyscallSucceeds());
-
-  // EOF: 3/4 page, writing 1/2 page starting at 1/2 page would cause the file
-  // to grow. Since this would require only the page containing the EOF to be
-  // modified, the write is rejected entirely.
-  const std::vector<char> buf(kPageSize / 2);
-  EXPECT_THAT(pwrite(memfd.get(), buf.data(), buf.size(), kPageSize / 2),
-              SyscallFailsWithErrno(EPERM));
-
-  // However, writing up to EOF is fine.
-  EXPECT_THAT(pwrite(memfd.get(), buf.data(), buf.size() / 2, kPageSize / 2),
-              SyscallSucceedsWithValue(kPageSize / 4));
-}
-
-// F_SEAL_SHRINK prevents a memfd from being shrunk using ftruncate.
-TEST(MemfdTest, SealShrink) {
-  const FileDescriptor memfd =
-      ASSERT_NO_ERRNO_AND_VALUE(MemfdCreate(kMemfdName, MFD_ALLOW_SEALING));
-  ASSERT_THAT(ftruncate(memfd.get(), kPageSize), SyscallSucceeds());
-  ASSERT_THAT(fcntl(memfd.get(), F_ADD_SEALS, F_SEAL_SHRINK),
-              SyscallSucceeds());
-
-  // Shrink by half a page.
-  ASSERT_THAT(ftruncate(memfd.get(), kPageSize / 2),
-              SyscallFailsWithErrno(EPERM));
-
-  // Ftruncate calls that don't actually shrink the file are allowed.
-  ASSERT_THAT(ftruncate(memfd.get(), kPageSize), SyscallSucceeds());
-  ASSERT_THAT(ftruncate(memfd.get(), kPageSize * 2), SyscallSucceeds());
-
-  // After growing, shrinking is still not allowed.
-  ASSERT_THAT(ftruncate(memfd.get(), kPageSize), SyscallFailsWithErrno(EPERM));
-}
-
-// F_SEAL_WRITE prevents a memfd from being written to through a write
-// syscall.
-TEST(MemfdTest, SealWriteWithWrite) {
-  const FileDescriptor memfd =
-      ASSERT_NO_ERRNO_AND_VALUE(MemfdCreate(kMemfdName, MFD_ALLOW_SEALING));
-  const std::vector<char> buf(kPageSize);
-  ASSERT_THAT(write(memfd.get(), buf.data(), buf.size()),
-              SyscallSucceedsWithValue(kPageSize));
-  ASSERT_THAT(fcntl(memfd.get(), F_ADD_SEALS, F_SEAL_WRITE), SyscallSucceeds());
-
-  // Attemping to write at the end of the file fails.
-  EXPECT_THAT(write(memfd.get(), buf.data(), 1), SyscallFailsWithErrno(EPERM));
-
-  // Attemping to overwrite an existing part of the memfd fails.
-  EXPECT_THAT(pwrite(memfd.get(), buf.data(), 1, 0),
-              SyscallFailsWithErrno(EPERM));
-  EXPECT_THAT(pwrite(memfd.get(), buf.data(), buf.size() / 2, kPageSize / 2),
-              SyscallFailsWithErrno(EPERM));
-  EXPECT_THAT(pwrite(memfd.get(), buf.data(), buf.size(), kPageSize / 2),
-              SyscallFailsWithErrno(EPERM));
-
-  // Zero-length writes however do not fail.
-  EXPECT_THAT(write(memfd.get(), buf.data(), 0), SyscallSucceeds());
-}
-
-// F_SEAL_WRITE prevents a memfd from being written to through an mmap.
-TEST(MemfdTest, SealWriteWithMmap) {
-  const FileDescriptor memfd =
-      ASSERT_NO_ERRNO_AND_VALUE(MemfdCreate(kMemfdName, MFD_ALLOW_SEALING));
-  const std::vector<char> buf(kPageSize);
-  ASSERT_THAT(write(memfd.get(), buf.data(), buf.size()),
-              SyscallSucceedsWithValue(kPageSize));
-  ASSERT_THAT(fcntl(memfd.get(), F_ADD_SEALS, F_SEAL_WRITE), SyscallSucceeds());
-
-  // Can't create a shared mapping with writes sealed.
-  void* ret = mmap(nullptr, kPageSize, PROT_WRITE, MAP_SHARED, memfd.get(), 0);
-  EXPECT_EQ(ret, MAP_FAILED);
-  EXPECT_EQ(errno, EPERM);
-  ret = mmap(nullptr, kPageSize, PROT_READ, MAP_SHARED, memfd.get(), 0);
-  EXPECT_EQ(ret, MAP_FAILED);
-  EXPECT_EQ(errno, EPERM);
-
-  // However, private mappings are ok.
-  EXPECT_NO_ERRNO(Mmap(nullptr, kPageSize, PROT_READ | PROT_WRITE, MAP_PRIVATE,
-                       memfd.get(), 0));
-}
-
-// Adding F_SEAL_WRITE fails when there are outstanding writable mappings to a
-// memfd.
-TEST(MemfdTest, SealWriteWithOutstandingWritbleMapping) {
-  const FileDescriptor memfd =
-      ASSERT_NO_ERRNO_AND_VALUE(MemfdCreate(kMemfdName, MFD_ALLOW_SEALING));
-  const std::vector<char> buf(kPageSize);
-  ASSERT_THAT(write(memfd.get(), buf.data(), buf.size()),
-              SyscallSucceedsWithValue(kPageSize));
-
-  // Attempting to add F_SEAL_WRITE with active shared mapping with any set of
-  // permissions fails.
-
-  // Read-only shared mapping.
-  {
-    const Mapping m = ASSERT_NO_ERRNO_AND_VALUE(
-        Mmap(nullptr, kPageSize, PROT_READ, MAP_SHARED, memfd.get(), 0));
-    EXPECT_THAT(fcntl(memfd.get(), F_ADD_SEALS, F_SEAL_WRITE),
-                SyscallFailsWithErrno(EBUSY));
-  }
-
-  // Write-only shared mapping.
-  {
-    const Mapping m = ASSERT_NO_ERRNO_AND_VALUE(
-        Mmap(nullptr, kPageSize, PROT_WRITE, MAP_SHARED, memfd.get(), 0));
-    EXPECT_THAT(fcntl(memfd.get(), F_ADD_SEALS, F_SEAL_WRITE),
-                SyscallFailsWithErrno(EBUSY));
-  }
-
-  // Read-write shared mapping.
-  {
-    const Mapping m = ASSERT_NO_ERRNO_AND_VALUE(
-        Mmap(nullptr, kPageSize, PROT_READ | PROT_WRITE, MAP_SHARED,
-             memfd.get(), 0));
-    EXPECT_THAT(fcntl(memfd.get(), F_ADD_SEALS, F_SEAL_WRITE),
-                SyscallFailsWithErrno(EBUSY));
-  }
-
-  // F_SEAL_WRITE can be set with private mappings with any permissions.
-  {
-    const Mapping m = ASSERT_NO_ERRNO_AND_VALUE(
-        Mmap(nullptr, kPageSize, PROT_READ | PROT_WRITE, MAP_PRIVATE,
-             memfd.get(), 0));
-    EXPECT_THAT(fcntl(memfd.get(), F_ADD_SEALS, F_SEAL_WRITE),
-                SyscallSucceeds());
-  }
-}
-
-// When applying F_SEAL_WRITE fails due to outstanding writable mappings, any
-// additional seals passed to the same add seal call are also rejected.
-TEST(MemfdTest, NoPartialSealApplicationWhenWriteSealRejected) {
-  const FileDescriptor memfd =
-      ASSERT_NO_ERRNO_AND_VALUE(MemfdCreate(kMemfdName, MFD_ALLOW_SEALING));
-  const Mapping m = ASSERT_NO_ERRNO_AND_VALUE(Mmap(
-      nullptr, kPageSize, PROT_READ | PROT_WRITE, MAP_SHARED, memfd.get(), 0));
-
-  // Try add some seals along with F_SEAL_WRITE. The seal application should
-  // fail since there exists an active shared mapping.
-  EXPECT_THAT(fcntl(memfd.get(), F_ADD_SEALS, F_SEAL_WRITE | F_SEAL_GROW),
-              SyscallFailsWithErrno(EBUSY));
-
-  // None of the seals should be applied.
-  EXPECT_THAT(fcntl(memfd.get(), F_GET_SEALS), SyscallSucceedsWithValue(0));
-}
-
-// Seals are inode level properties, and apply to all file descriptors referring
-// to a memfd.
-TEST(MemfdTest, SealsAreInodeLevelProperties) {
-  const FileDescriptor memfd =
-      ASSERT_NO_ERRNO_AND_VALUE(MemfdCreate(kMemfdName, MFD_ALLOW_SEALING));
-  const FileDescriptor memfd2 = ASSERT_NO_ERRNO_AND_VALUE(memfd.Dup());
-
-  // Add seal through the original memfd, and verify that it appears on the
-  // dupped fd.
-  ASSERT_THAT(fcntl(memfd.get(), F_ADD_SEALS, F_SEAL_WRITE), SyscallSucceeds());
-  EXPECT_THAT(fcntl(memfd2.get(), F_GET_SEALS),
-              SyscallSucceedsWithValue(F_SEAL_WRITE));
-
-  // Verify the seal actually applies to both fds.
-  std::vector<char> buf(kPageSize);
-  EXPECT_THAT(write(memfd.get(), buf.data(), buf.size()),
-              SyscallFailsWithErrno(EPERM));
-  EXPECT_THAT(write(memfd2.get(), buf.data(), buf.size()),
-              SyscallFailsWithErrno(EPERM));
-
-  // Seals are enforced on new FDs that are dupped after the seal is already
-  // applied.
-  const FileDescriptor memfd3 = ASSERT_NO_ERRNO_AND_VALUE(memfd2.Dup());
-  EXPECT_THAT(write(memfd3.get(), buf.data(), buf.size()),
-              SyscallFailsWithErrno(EPERM));
-
-  // Try a new seal applied to one of the dupped fds.
-  ASSERT_THAT(fcntl(memfd3.get(), F_ADD_SEALS, F_SEAL_GROW), SyscallSucceeds());
-  EXPECT_THAT(ftruncate(memfd.get(), kPageSize), SyscallFailsWithErrno(EPERM));
-  EXPECT_THAT(ftruncate(memfd2.get(), kPageSize), SyscallFailsWithErrno(EPERM));
-  EXPECT_THAT(ftruncate(memfd3.get(), kPageSize), SyscallFailsWithErrno(EPERM));
-}
-
-// Tmpfs files also support seals, but are created with F_SEAL_SEAL.
-TEST(MemfdTest, TmpfsFilesHaveSealSeal) {
-  SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(IsTmpfs("/tmp")));
-  const TempPath tmpfs_file =
-      ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFileIn("/tmp"));
-  const FileDescriptor fd =
-      ASSERT_NO_ERRNO_AND_VALUE(Open(tmpfs_file.path(), O_RDWR, 0644));
-  EXPECT_THAT(fcntl(fd.get(), F_GET_SEALS),
-              SyscallSucceedsWithValue(F_SEAL_SEAL));
-}
-
-// Can open a memfd from procfs and use as normal.
-TEST(MemfdTest, CanOpenFromProcfs) {
-  const FileDescriptor memfd =
-      ASSERT_NO_ERRNO_AND_VALUE(MemfdCreate(kMemfdName, MFD_ALLOW_SEALING));
-
-  // Write a random page of data to the memfd via write(2).
-  std::vector<char> buf(kPageSize);
-  RandomizeBuffer(buf.data(), buf.size());
-  ASSERT_THAT(write(memfd.get(), buf.data(), buf.size()),
-              SyscallSucceedsWithValue(kPageSize));
-
-  // Read back the same data from the fd obtained from procfs and verify.
-  const FileDescriptor fd = ASSERT_NO_ERRNO_AND_VALUE(
-      Open(absl::StrFormat("/proc/self/fd/%d", memfd.get()), O_RDWR));
-  std::vector<char> buf2(kPageSize);
-  EXPECT_THAT(pread(fd.get(), buf2.data(), buf2.size(), 0),
-              SyscallSucceedsWithValue(kPageSize));
-  EXPECT_EQ(buf, buf2);
-}
-
-// Test that memfd permissions are set up correctly to allow another process to
-// open it from procfs.
-TEST(MemfdTest, OtherProcessCanOpenFromProcfs) {
-  const FileDescriptor memfd =
-      ASSERT_NO_ERRNO_AND_VALUE(MemfdCreate(kMemfdName, MFD_ALLOW_SEALING));
-  const auto memfd_path =
-      absl::StrFormat("/proc/%d/fd/%d", getpid(), memfd.get());
-  const auto rest = [&] {
-    int fd = open(memfd_path.c_str(), O_RDWR);
-    TEST_PCHECK(fd >= 0);
-    TEST_PCHECK(close(fd) >= 0);
-  };
-  EXPECT_THAT(InForkedProcess(rest), IsPosixErrorOkAndHolds(0));
-}
-
-// Test that only files opened as writable can have seals applied to them.
-// Normally there's no way to specify file permissions on memfds, but we can
-// obtain a read-only memfd by opening the corresponding procfs fd entry as
-// read-only.
-TEST(MemfdTest, MemfdMustBeWritableToModifySeals) {
-  const FileDescriptor memfd =
-      ASSERT_NO_ERRNO_AND_VALUE(MemfdCreate(kMemfdName, MFD_ALLOW_SEALING));
-
-  // Initially adding a seal works.
-  EXPECT_THAT(fcntl(memfd.get(), F_ADD_SEALS, F_SEAL_WRITE), SyscallSucceeds());
-
-  // Re-open the memfd as read-only from procfs.
-  const FileDescriptor fd = ASSERT_NO_ERRNO_AND_VALUE(
-      Open(absl::StrFormat("/proc/self/fd/%d", memfd.get()), O_RDONLY));
-
-  // Can't add seals through an unwritable fd.
-  EXPECT_THAT(fcntl(fd.get(), F_ADD_SEALS, F_SEAL_GROW),
-              SyscallFailsWithErrno(EPERM));
-}
-
-// Test that the memfd implementation internally tracks potentially writable
-// maps correctly.
-TEST(MemfdTest, MultipleWritableAndNonWritableRefsToSameFileRegion) {
-  const FileDescriptor memfd =
-      ASSERT_NO_ERRNO_AND_VALUE(MemfdCreate(kMemfdName, 0));
-
-  // Populate with a random page of data.
-  std::vector<char> buf(kPageSize);
-  RandomizeBuffer(buf.data(), buf.size());
-  ASSERT_THAT(write(memfd.get(), buf.data(), buf.size()),
-              SyscallSucceedsWithValue(kPageSize));
-
-  // Read-only map to the page. This should cause an initial mapping to be
-  // created.
-  Mapping m1 = ASSERT_NO_ERRNO_AND_VALUE(
-      Mmap(nullptr, kPageSize, PROT_READ, MAP_PRIVATE, memfd.get(), 0));
-
-  // Create a shared writable map to the page. This should cause the internal
-  // mapping to become potentially writable.
-  Mapping m2 = ASSERT_NO_ERRNO_AND_VALUE(Mmap(
-      nullptr, kPageSize, PROT_READ | PROT_WRITE, MAP_SHARED, memfd.get(), 0));
-
-  // Drop the read-only mapping first. If writable-ness isn't tracked correctly,
-  // this can cause some misaccounting, which can trigger asserts internally.
-  m1.reset();
-  m2.reset();
-}
-
-}  // namespace
-}  // namespace testing
-}  // namespace gvisor