1 files changed, 0 insertions, 448 deletions
diff --git a/test/syscalls/linux/fork.cc b/test/syscalls/linux/fork.cc
deleted file mode 100644
index 906f3358d..000000000
--- a/test/syscalls/linux/fork.cc
+++ /dev/null
@@ -1,448 +0,0 @@
-// 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 <sched.h>
-#include <stdlib.h>
-#include <sys/mman.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <unistd.h>
-
-#include <atomic>
-#include <cstdlib>
-
-#include "gtest/gtest.h"
-#include "absl/time/clock.h"
-#include "absl/time/time.h"
-#include "test/util/capability_util.h"
-#include "test/util/logging.h"
-#include "test/util/memory_util.h"
-#include "test/util/test_util.h"
-#include "test/util/thread_util.h"
-
-namespace gvisor {
-namespace testing {
-
-namespace {
-
-using ::testing::Ge;
-
-class ForkTest : public ::testing::Test {
- protected:
-  // SetUp creates a populated, open file.
-  void SetUp() override {
-    // Make a shared mapping.
-    shared_ = reinterpret_cast<char*>(mmap(0, kPageSize, PROT_READ | PROT_WRITE,
-                                           MAP_SHARED | MAP_ANONYMOUS, -1, 0));
-    ASSERT_NE(reinterpret_cast<void*>(shared_), MAP_FAILED);
-
-    // Make a private mapping.
-    private_ =
-        reinterpret_cast<char*>(mmap(0, kPageSize, PROT_READ | PROT_WRITE,
-                                     MAP_PRIVATE | MAP_ANONYMOUS, -1, 0));
-    ASSERT_NE(reinterpret_cast<void*>(private_), MAP_FAILED);
-
-    // Make a pipe.
-    ASSERT_THAT(pipe(pipes_), SyscallSucceeds());
-  }
-
-  // TearDown frees associated resources.
-  void TearDown() override {
-    EXPECT_THAT(munmap(shared_, kPageSize), SyscallSucceeds());
-    EXPECT_THAT(munmap(private_, kPageSize), SyscallSucceeds());
-    EXPECT_THAT(close(pipes_[0]), SyscallSucceeds());
-    EXPECT_THAT(close(pipes_[1]), SyscallSucceeds());
-  }
-
-  // Fork executes a clone system call.
-  pid_t Fork() {
-    pid_t pid = fork();
-    MaybeSave();
-    TEST_PCHECK_MSG(pid >= 0, "fork failed");
-    return pid;
-  }
-
-  // Wait waits for the given pid and returns the exit status. If the child was
-  // killed by a signal or an error occurs, then 256+signal is returned.
-  int Wait(pid_t pid) {
-    int status;
-    while (true) {
-      int rval = wait4(pid, &status, 0, NULL);
-      if (rval < 0) {
-        return rval;
-      }
-      if (rval != pid) {
-        continue;
-      }
-      if (WIFEXITED(status)) {
-        return WEXITSTATUS(status);
-      }
-      if (WIFSIGNALED(status)) {
-        return 256 + WTERMSIG(status);
-      }
-    }
-  }
-
-  // Exit exits the proccess.
-  void Exit(int code) {
-    _exit(code);
-
-    // Should never reach here. Since the exit above failed, we really don't
-    // have much in the way of options to indicate failure. So we just try to
-    // log an assertion failure to the logs. The parent process will likely
-    // fail anyways if exit is not working.
-    TEST_CHECK_MSG(false, "_exit returned");
-  }
-
-  // ReadByte reads a byte from the shared pipe.
-  char ReadByte() {
-    char val = -1;
-    TEST_PCHECK(ReadFd(pipes_[0], &val, 1) == 1);
-    MaybeSave();
-    return val;
-  }
-
-  // WriteByte writes a byte from the shared pipe.
-  void WriteByte(char val) {
-    TEST_PCHECK(WriteFd(pipes_[1], &val, 1) == 1);
-    MaybeSave();
-  }
-
-  // Shared pipe.
-  int pipes_[2];
-
-  // Shared mapping (one page).
-  char* shared_;
-
-  // Private mapping (one page).
-  char* private_;
-};
-
-TEST_F(ForkTest, Simple) {
-  pid_t child = Fork();
-  if (child == 0) {
-    Exit(0);
-  }
-  EXPECT_THAT(Wait(child), SyscallSucceedsWithValue(0));
-}
-
-TEST_F(ForkTest, ExitCode) {
-  pid_t child = Fork();
-  if (child == 0) {
-    Exit(123);
-  }
-  EXPECT_THAT(Wait(child), SyscallSucceedsWithValue(123));
-  child = Fork();
-  if (child == 0) {
-    Exit(1);
-  }
-  EXPECT_THAT(Wait(child), SyscallSucceedsWithValue(1));
-}
-
-TEST_F(ForkTest, Multi) {
-  pid_t child1 = Fork();
-  if (child1 == 0) {
-    Exit(0);
-  }
-  pid_t child2 = Fork();
-  if (child2 == 0) {
-    Exit(1);
-  }
-  EXPECT_THAT(Wait(child1), SyscallSucceedsWithValue(0));
-  EXPECT_THAT(Wait(child2), SyscallSucceedsWithValue(1));
-}
-
-TEST_F(ForkTest, Pipe) {
-  pid_t child = Fork();
-  if (child == 0) {
-    WriteByte(1);
-    Exit(0);
-  }
-  EXPECT_EQ(ReadByte(), 1);
-  EXPECT_THAT(Wait(child), SyscallSucceedsWithValue(0));
-}
-
-TEST_F(ForkTest, SharedMapping) {
-  pid_t child = Fork();
-  if (child == 0) {
-    // Wait for the parent.
-    ReadByte();
-    if (shared_[0] == 1) {
-      Exit(0);
-    }
-    // Failed.
-    Exit(1);
-  }
-  // Change the mapping.
-  ASSERT_EQ(shared_[0], 0);
-  shared_[0] = 1;
-  // Unblock the child.
-  WriteByte(0);
-  // Did it work?
-  EXPECT_THAT(Wait(child), SyscallSucceedsWithValue(0));
-}
-
-TEST_F(ForkTest, PrivateMapping) {
-  pid_t child = Fork();
-  if (child == 0) {
-    // Wait for the parent.
-    ReadByte();
-    if (private_[0] == 0) {
-      Exit(0);
-    }
-    // Failed.
-    Exit(1);
-  }
-  // Change the mapping.
-  ASSERT_EQ(private_[0], 0);
-  private_[0] = 1;
-  // Unblock the child.
-  WriteByte(0);
-  // Did it work?
-  EXPECT_THAT(Wait(child), SyscallSucceedsWithValue(0));
-}
-
-// CPUID is x86 specific.
-#ifdef __x86_64__
-// Test that cpuid works after a fork.
-TEST_F(ForkTest, Cpuid) {
-  pid_t child = Fork();
-
-  // We should be able to determine the CPU vendor.
-  ASSERT_NE(GetCPUVendor(), CPUVendor::kUnknownVendor);
-
-  if (child == 0) {
-    Exit(0);
-  }
-  EXPECT_THAT(Wait(child), SyscallSucceedsWithValue(0));
-}
-#endif
-
-TEST_F(ForkTest, Mmap) {
-  pid_t child = Fork();
-
-  if (child == 0) {
-    void* addr =
-        mmap(0, kPageSize, PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
-    MaybeSave();
-    Exit(addr == MAP_FAILED);
-  }
-
-  EXPECT_THAT(Wait(child), SyscallSucceedsWithValue(0));
-}
-
-static volatile int alarmed = 0;
-
-void AlarmHandler(int sig, siginfo_t* info, void* context) { alarmed = 1; }
-
-TEST_F(ForkTest, Alarm) {
-  // Setup an alarm handler.
-  struct sigaction sa;
-  sa.sa_sigaction = AlarmHandler;
-  sigfillset(&sa.sa_mask);
-  sa.sa_flags = SA_SIGINFO;
-  EXPECT_THAT(sigaction(SIGALRM, &sa, nullptr), SyscallSucceeds());
-
-  pid_t child = Fork();
-
-  if (child == 0) {
-    alarm(1);
-    sleep(3);
-    if (!alarmed) {
-      Exit(1);
-    }
-    Exit(0);
-  }
-
-  EXPECT_THAT(Wait(child), SyscallSucceedsWithValue(0));
-  EXPECT_EQ(0, alarmed);
-}
-
-// Child cannot affect parent private memory.
-TEST_F(ForkTest, PrivateMemory) {
-  std::atomic<uint32_t> local(0);
-
-  pid_t child1 = Fork();
-  if (child1 == 0) {
-    local++;
-
-    pid_t child2 = Fork();
-    if (child2 == 0) {
-      local++;
-
-      TEST_CHECK(local.load() == 2);
-
-      Exit(0);
-    }
-
-    TEST_PCHECK(Wait(child2) == 0);
-    TEST_CHECK(local.load() == 1);
-    Exit(0);
-  }
-
-  EXPECT_THAT(Wait(child1), SyscallSucceedsWithValue(0));
-  EXPECT_EQ(0, local.load());
-}
-
-// Kernel-accessed buffers should remain coherent across COW.
-TEST_F(ForkTest, COWSegment) {
-  constexpr int kBufSize = 1024;
-  char* read_buf = private_;
-  char* touch = private_ + kPageSize / 2;
-
-  std::string contents(kBufSize, 'a');
-
-  ScopedThread t([&] {
-    // Wait to be sure the parent is blocked in read.
-    absl::SleepFor(absl::Seconds(3));
-
-    // Fork to mark private pages for COW.
-    //
-    // Use fork directly rather than the Fork wrapper to skip the multi-threaded
-    // check, and limit the child to async-signal-safe functions:
-    //
-    // "After a fork() in a multithreaded program, the child can safely call
-    // only async-signal-safe functions (see signal(7)) until such time as it
-    // calls execve(2)."
-    //
-    // Skip ASSERT in the child, as it isn't async-signal-safe.
-    pid_t child = fork();
-    if (child == 0) {
-      // Wait to be sure parent touched memory.
-      sleep(3);
-      Exit(0);
-    }
-
-    // Check success only in the parent.
-    ASSERT_THAT(child, SyscallSucceedsWithValue(Ge(0)));
-
-    // Trigger COW on private page.
-    *touch = 42;
-
-    // Write to pipe. Parent should still be able to read this.
-    EXPECT_THAT(WriteFd(pipes_[1], contents.c_str(), kBufSize),
-                SyscallSucceedsWithValue(kBufSize));
-
-    EXPECT_THAT(Wait(child), SyscallSucceedsWithValue(0));
-  });
-
-  EXPECT_THAT(ReadFd(pipes_[0], read_buf, kBufSize),
-              SyscallSucceedsWithValue(kBufSize));
-  EXPECT_STREQ(contents.c_str(), read_buf);
-}
-
-TEST_F(ForkTest, SigAltStack) {
-  std::vector<char> stack_mem(SIGSTKSZ);
-  stack_t stack = {};
-  stack.ss_size = SIGSTKSZ;
-  stack.ss_sp = stack_mem.data();
-  ASSERT_THAT(sigaltstack(&stack, nullptr), SyscallSucceeds());
-
-  pid_t child = Fork();
-
-  if (child == 0) {
-    stack_t oss = {};
-    TEST_PCHECK(sigaltstack(nullptr, &oss) == 0);
-    MaybeSave();
-
-    TEST_CHECK((oss.ss_flags & SS_DISABLE) == 0);
-    TEST_CHECK(oss.ss_size == SIGSTKSZ);
-    TEST_CHECK(oss.ss_sp == stack.ss_sp);
-
-    Exit(0);
-  }
-  EXPECT_THAT(Wait(child), SyscallSucceedsWithValue(0));
-}
-
-TEST_F(ForkTest, Affinity) {
-  // Make a non-default cpumask.
-  cpu_set_t parent_mask;
-  EXPECT_THAT(sched_getaffinity(/*pid=*/0, sizeof(cpu_set_t), &parent_mask),
-              SyscallSucceeds());
-  // Knock out the lowest bit.
-  for (unsigned int n = 0; n < CPU_SETSIZE; n++) {
-    if (CPU_ISSET(n, &parent_mask)) {
-      CPU_CLR(n, &parent_mask);
-      break;
-    }
-  }
-  EXPECT_THAT(sched_setaffinity(/*pid=*/0, sizeof(cpu_set_t), &parent_mask),
-              SyscallSucceeds());
-
-  pid_t child = Fork();
-  if (child == 0) {
-    cpu_set_t child_mask;
-
-    int ret = sched_getaffinity(/*pid=*/0, sizeof(cpu_set_t), &child_mask);
-    MaybeSave();
-    if (ret < 0) {
-      Exit(-ret);
-    }
-
-    TEST_CHECK(CPU_EQUAL(&child_mask, &parent_mask));
-
-    Exit(0);
-  }
-
-  EXPECT_THAT(Wait(child), SyscallSucceedsWithValue(0));
-}
-
-TEST(CloneTest, NewUserNamespacePermitsAllOtherNamespaces) {
-  // "If CLONE_NEWUSER is specified along with other CLONE_NEW* flags in a
-  // single clone(2) or unshare(2) call, the user namespace is guaranteed to be
-  // created first, giving the child (clone(2)) or caller (unshare(2))
-  // privileges over the remaining namespaces created by the call. Thus, it is
-  // possible for an unprivileged caller to specify this combination of flags."
-  // - user_namespaces(7)
-  SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(CanCreateUserNamespace()));
-  Mapping child_stack = ASSERT_NO_ERRNO_AND_VALUE(
-      MmapAnon(kPageSize, PROT_READ | PROT_WRITE, MAP_PRIVATE));
-  int child_pid;
-  // We only test with CLONE_NEWIPC, CLONE_NEWNET, and CLONE_NEWUTS since these
-  // namespaces were implemented in Linux before user namespaces.
-  ASSERT_THAT(
-      child_pid = clone(
-          +[](void*) { return 0; },
-          reinterpret_cast<void*>(child_stack.addr() + kPageSize),
-          CLONE_NEWUSER | CLONE_NEWIPC | CLONE_NEWNET | CLONE_NEWUTS | SIGCHLD,
-          /* arg = */ nullptr),
-      SyscallSucceeds());
-
-  int status;
-  ASSERT_THAT(waitpid(child_pid, &status, 0),
-              SyscallSucceedsWithValue(child_pid));
-  EXPECT_TRUE(WIFEXITED(status) && WEXITSTATUS(status) == 0)
-      << "status = " << status;
-}
-
-#ifdef __x86_64__
-// Clone with CLONE_SETTLS and a non-canonical TLS address is rejected.
-TEST(CloneTest, NonCanonicalTLS) {
-  constexpr uintptr_t kNonCanonical = 1ull << 48;
-
-  // We need a valid address for the stack pointer. We'll never actually execute
-  // on this.
-  char stack;
-
-  EXPECT_THAT(syscall(__NR_clone, SIGCHLD | CLONE_SETTLS, &stack, nullptr,
-                      nullptr, kNonCanonical),
-              SyscallFailsWithErrno(EPERM));
-}
-#endif
-
-}  // namespace
-}  // namespace testing
-}  // namespace gvisor