From 8c1f5b5cd8b634a5e7255944f42e82c5c9de3149 Mon Sep 17 00:00:00 2001 From: Andrei Vagin Date: Fri, 5 Jun 2020 14:43:56 -0700 Subject: Unshare files on exec The current task can share its fdtable with a few other tasks, but after exec, this should be a completely separate process. PiperOrigin-RevId: 314999565 --- test/syscalls/linux/exec.cc | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) (limited to 'test/syscalls') diff --git a/test/syscalls/linux/exec.cc b/test/syscalls/linux/exec.cc index 12c9b05ca..e09afafe9 100644 --- a/test/syscalls/linux/exec.cc +++ b/test/syscalls/linux/exec.cc @@ -673,6 +673,33 @@ TEST(ExecveatTest, SymlinkNoFollowWithRelativePath) { EXPECT_EQ(execve_errno, ELOOP); } +TEST(ExecveatTest, UnshareFiles) { + TempPath tempFile = ASSERT_NO_ERRNO_AND_VALUE( + TempPath::CreateFileWith(GetAbsoluteTestTmpdir(), "bar", 0755)); + const FileDescriptor fd_closed_on_exec = + ASSERT_NO_ERRNO_AND_VALUE(Open(tempFile.path(), O_RDONLY | O_CLOEXEC)); + + pid_t child; + EXPECT_THAT(child = syscall(__NR_clone, SIGCHLD | CLONE_VFORK | CLONE_FILES, + 0, 0, 0, 0), + SyscallSucceeds()); + if (child == 0) { + ExecveArray argv = {"test"}; + ExecveArray envp; + ASSERT_THAT( + execve(RunfilePath(kBasicWorkload).c_str(), argv.get(), envp.get()), + SyscallSucceeds()); + _exit(1); + } + + int status; + ASSERT_THAT(RetryEINTR(waitpid)(child, &status, 0), SyscallSucceeds()); + EXPECT_EQ(status, 0); + + struct stat st; + EXPECT_THAT(fstat(fd_closed_on_exec.get(), &st), SyscallSucceeds()); +} + TEST(ExecveatTest, SymlinkNoFollowWithAbsolutePath) { std::string parent_dir = "/tmp"; TempPath link = ASSERT_NO_ERRNO_AND_VALUE( -- cgit v1.2.3