| //! File and file system access |
| |
| use std::borrow::Cow; |
| use std::fs::{ |
| read_dir, remove_dir, remove_file, rename, DirBuilder, File, FileType, OpenOptions, ReadDir, |
| }; |
| use std::io::{self, ErrorKind, IsTerminal, Read, Seek, SeekFrom, Write}; |
| use std::path::{Path, PathBuf}; |
| use std::time::SystemTime; |
| |
| use rustc_data_structures::fx::FxHashMap; |
| use rustc_middle::ty::TyCtxt; |
| use rustc_target::abi::Size; |
| |
| use crate::shims::os_str::bytes_to_os_str; |
| use crate::shims::unix::*; |
| use crate::*; |
| use shims::time::system_time_to_duration; |
| |
| use self::fd::FileDescriptor; |
| |
| #[derive(Debug)] |
| struct FileHandle { |
| file: File, |
| writable: bool, |
| } |
| |
| impl FileDescription for FileHandle { |
| fn name(&self) -> &'static str { |
| "file" |
| } |
| |
| fn read<'tcx>( |
| &mut self, |
| communicate_allowed: bool, |
| bytes: &mut [u8], |
| _tcx: TyCtxt<'tcx>, |
| ) -> InterpResult<'tcx, io::Result<usize>> { |
| assert!(communicate_allowed, "isolation should have prevented even opening a file"); |
| Ok(self.file.read(bytes)) |
| } |
| |
| fn write<'tcx>( |
| &mut self, |
| communicate_allowed: bool, |
| bytes: &[u8], |
| _tcx: TyCtxt<'tcx>, |
| ) -> InterpResult<'tcx, io::Result<usize>> { |
| assert!(communicate_allowed, "isolation should have prevented even opening a file"); |
| Ok(self.file.write(bytes)) |
| } |
| |
| fn seek<'tcx>( |
| &mut self, |
| communicate_allowed: bool, |
| offset: SeekFrom, |
| ) -> InterpResult<'tcx, io::Result<u64>> { |
| assert!(communicate_allowed, "isolation should have prevented even opening a file"); |
| Ok(self.file.seek(offset)) |
| } |
| |
| fn close<'tcx>( |
| self: Box<Self>, |
| communicate_allowed: bool, |
| ) -> InterpResult<'tcx, io::Result<()>> { |
| assert!(communicate_allowed, "isolation should have prevented even opening a file"); |
| // We sync the file if it was opened in a mode different than read-only. |
| if self.writable { |
| // `File::sync_all` does the checks that are done when closing a file. We do this to |
| // to handle possible errors correctly. |
| let result = self.file.sync_all(); |
| // Now we actually close the file and return the result. |
| Ok(result) |
| } else { |
| // We drop the file, this closes it but ignores any errors |
| // produced when closing it. This is done because |
| // `File::sync_all` cannot be done over files like |
| // `/dev/urandom` which are read-only. Check |
| // https://github.com/rust-lang/miri/issues/999#issuecomment-568920439 |
| // for a deeper discussion. |
| Ok(Ok(())) |
| } |
| } |
| |
| fn is_tty(&self, communicate_allowed: bool) -> bool { |
| communicate_allowed && self.file.is_terminal() |
| } |
| } |
| |
| impl<'mir, 'tcx: 'mir> EvalContextExtPrivate<'mir, 'tcx> for crate::MiriInterpCx<'mir, 'tcx> {} |
| trait EvalContextExtPrivate<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> { |
| fn macos_stat_write_buf( |
| &mut self, |
| metadata: FileMetadata, |
| buf_op: &OpTy<'tcx, Provenance>, |
| ) -> InterpResult<'tcx, i32> { |
| let this = self.eval_context_mut(); |
| |
| let mode: u16 = metadata.mode.to_u16()?; |
| |
| let (access_sec, access_nsec) = metadata.accessed.unwrap_or((0, 0)); |
| let (created_sec, created_nsec) = metadata.created.unwrap_or((0, 0)); |
| let (modified_sec, modified_nsec) = metadata.modified.unwrap_or((0, 0)); |
| |
| let buf = this.deref_pointer_as(buf_op, this.libc_ty_layout("stat"))?; |
| |
| this.write_int_fields_named( |
| &[ |
| ("st_dev", 0), |
| ("st_mode", mode.into()), |
| ("st_nlink", 0), |
| ("st_ino", 0), |
| ("st_uid", 0), |
| ("st_gid", 0), |
| ("st_rdev", 0), |
| ("st_atime", access_sec.into()), |
| ("st_atime_nsec", access_nsec.into()), |
| ("st_mtime", modified_sec.into()), |
| ("st_mtime_nsec", modified_nsec.into()), |
| ("st_ctime", 0), |
| ("st_ctime_nsec", 0), |
| ("st_birthtime", created_sec.into()), |
| ("st_birthtime_nsec", created_nsec.into()), |
| ("st_size", metadata.size.into()), |
| ("st_blocks", 0), |
| ("st_blksize", 0), |
| ("st_flags", 0), |
| ("st_gen", 0), |
| ], |
| &buf, |
| )?; |
| |
| Ok(0) |
| } |
| |
| fn file_type_to_d_type( |
| &mut self, |
| file_type: std::io::Result<FileType>, |
| ) -> InterpResult<'tcx, i32> { |
| let this = self.eval_context_mut(); |
| match file_type { |
| Ok(file_type) => { |
| if file_type.is_dir() { |
| Ok(this.eval_libc("DT_DIR").to_u8()?.into()) |
| } else if file_type.is_file() { |
| Ok(this.eval_libc("DT_REG").to_u8()?.into()) |
| } else if file_type.is_symlink() { |
| Ok(this.eval_libc("DT_LNK").to_u8()?.into()) |
| } else { |
| // Certain file types are only supported when the host is a Unix system. |
| // (i.e. devices and sockets) If it is, check those cases, if not, fall back to |
| // DT_UNKNOWN sooner. |
| |
| #[cfg(unix)] |
| { |
| use std::os::unix::fs::FileTypeExt; |
| if file_type.is_block_device() { |
| Ok(this.eval_libc("DT_BLK").to_u8()?.into()) |
| } else if file_type.is_char_device() { |
| Ok(this.eval_libc("DT_CHR").to_u8()?.into()) |
| } else if file_type.is_fifo() { |
| Ok(this.eval_libc("DT_FIFO").to_u8()?.into()) |
| } else if file_type.is_socket() { |
| Ok(this.eval_libc("DT_SOCK").to_u8()?.into()) |
| } else { |
| Ok(this.eval_libc("DT_UNKNOWN").to_u8()?.into()) |
| } |
| } |
| #[cfg(not(unix))] |
| Ok(this.eval_libc("DT_UNKNOWN").to_u8()?.into()) |
| } |
| } |
| Err(e) => |
| match e.raw_os_error() { |
| Some(error) => Ok(error), |
| None => |
| throw_unsup_format!( |
| "the error {} couldn't be converted to a return value", |
| e |
| ), |
| }, |
| } |
| } |
| } |
| |
| /// An open directory, tracked by DirHandler. |
| #[derive(Debug)] |
| struct OpenDir { |
| /// The directory reader on the host. |
| read_dir: ReadDir, |
| /// The most recent entry returned by readdir(). |
| /// Will be freed by the next call. |
| entry: Option<Pointer<Option<Provenance>>>, |
| } |
| |
| impl OpenDir { |
| fn new(read_dir: ReadDir) -> Self { |
| Self { read_dir, entry: None } |
| } |
| } |
| |
| /// The table of open directories. |
| /// Curiously, Unix/POSIX does not unify this into the "file descriptor" concept... everything |
| /// is a file, except a directory is not? |
| #[derive(Debug)] |
| pub struct DirTable { |
| /// Directory iterators used to emulate libc "directory streams", as used in opendir, readdir, |
| /// and closedir. |
| /// |
| /// When opendir is called, a directory iterator is created on the host for the target |
| /// directory, and an entry is stored in this hash map, indexed by an ID which represents |
| /// the directory stream. When readdir is called, the directory stream ID is used to look up |
| /// the corresponding ReadDir iterator from this map, and information from the next |
| /// directory entry is returned. When closedir is called, the ReadDir iterator is removed from |
| /// the map. |
| streams: FxHashMap<u64, OpenDir>, |
| /// ID number to be used by the next call to opendir |
| next_id: u64, |
| } |
| |
| impl DirTable { |
| #[allow(clippy::arithmetic_side_effects)] |
| fn insert_new(&mut self, read_dir: ReadDir) -> u64 { |
| let id = self.next_id; |
| self.next_id += 1; |
| self.streams.try_insert(id, OpenDir::new(read_dir)).unwrap(); |
| id |
| } |
| } |
| |
| impl Default for DirTable { |
| fn default() -> DirTable { |
| DirTable { |
| streams: FxHashMap::default(), |
| // Skip 0 as an ID, because it looks like a null pointer to libc |
| next_id: 1, |
| } |
| } |
| } |
| |
| impl VisitProvenance for DirTable { |
| fn visit_provenance(&self, visit: &mut VisitWith<'_>) { |
| let DirTable { streams, next_id: _ } = self; |
| |
| for dir in streams.values() { |
| dir.entry.visit_provenance(visit); |
| } |
| } |
| } |
| |
| fn maybe_sync_file( |
| file: &File, |
| writable: bool, |
| operation: fn(&File) -> std::io::Result<()>, |
| ) -> std::io::Result<i32> { |
| if !writable && cfg!(windows) { |
| // sync_all() and sync_data() will return an error on Windows hosts if the file is not opened |
| // for writing. (FlushFileBuffers requires that the file handle have the |
| // GENERIC_WRITE right) |
| Ok(0i32) |
| } else { |
| let result = operation(file); |
| result.map(|_| 0i32) |
| } |
| } |
| |
| impl<'mir, 'tcx: 'mir> EvalContextExt<'mir, 'tcx> for crate::MiriInterpCx<'mir, 'tcx> {} |
| pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> { |
| fn open(&mut self, args: &[OpTy<'tcx, Provenance>]) -> InterpResult<'tcx, i32> { |
| if args.len() < 2 { |
| throw_ub_format!( |
| "incorrect number of arguments for `open`: got {}, expected at least 2", |
| args.len() |
| ); |
| } |
| |
| let this = self.eval_context_mut(); |
| |
| let path = this.read_pointer(&args[0])?; |
| let flag = this.read_scalar(&args[1])?.to_i32()?; |
| |
| let mut options = OpenOptions::new(); |
| |
| let o_rdonly = this.eval_libc_i32("O_RDONLY"); |
| let o_wronly = this.eval_libc_i32("O_WRONLY"); |
| let o_rdwr = this.eval_libc_i32("O_RDWR"); |
| // The first two bits of the flag correspond to the access mode in linux, macOS and |
| // windows. We need to check that in fact the access mode flags for the current target |
| // only use these two bits, otherwise we are in an unsupported target and should error. |
| if (o_rdonly | o_wronly | o_rdwr) & !0b11 != 0 { |
| throw_unsup_format!("access mode flags on this target are unsupported"); |
| } |
| let mut writable = true; |
| |
| // Now we check the access mode |
| let access_mode = flag & 0b11; |
| |
| if access_mode == o_rdonly { |
| writable = false; |
| options.read(true); |
| } else if access_mode == o_wronly { |
| options.write(true); |
| } else if access_mode == o_rdwr { |
| options.read(true).write(true); |
| } else { |
| throw_unsup_format!("unsupported access mode {:#x}", access_mode); |
| } |
| // We need to check that there aren't unsupported options in `flag`. For this we try to |
| // reproduce the content of `flag` in the `mirror` variable using only the supported |
| // options. |
| let mut mirror = access_mode; |
| |
| let o_append = this.eval_libc_i32("O_APPEND"); |
| if flag & o_append == o_append { |
| options.append(true); |
| mirror |= o_append; |
| } |
| let o_trunc = this.eval_libc_i32("O_TRUNC"); |
| if flag & o_trunc == o_trunc { |
| options.truncate(true); |
| mirror |= o_trunc; |
| } |
| let o_creat = this.eval_libc_i32("O_CREAT"); |
| if flag & o_creat == o_creat { |
| // Get the mode. On macOS, the argument type `mode_t` is actually `u16`, but |
| // C integer promotion rules mean that on the ABI level, it gets passed as `u32` |
| // (see https://github.com/rust-lang/rust/issues/71915). |
| let mode = if let Some(arg) = args.get(2) { |
| this.read_scalar(arg)?.to_u32()? |
| } else { |
| throw_ub_format!( |
| "incorrect number of arguments for `open` with `O_CREAT`: got {}, expected at least 3", |
| args.len() |
| ); |
| }; |
| |
| #[cfg(unix)] |
| { |
| // Support all modes on UNIX host |
| use std::os::unix::fs::OpenOptionsExt; |
| options.mode(mode); |
| } |
| #[cfg(not(unix))] |
| { |
| // Only support default mode for non-UNIX (i.e. Windows) host |
| if mode != 0o666 { |
| throw_unsup_format!( |
| "non-default mode 0o{:o} is not supported on non-Unix hosts", |
| mode |
| ); |
| } |
| } |
| |
| mirror |= o_creat; |
| |
| let o_excl = this.eval_libc_i32("O_EXCL"); |
| if flag & o_excl == o_excl { |
| mirror |= o_excl; |
| options.create_new(true); |
| } else { |
| options.create(true); |
| } |
| } |
| let o_cloexec = this.eval_libc_i32("O_CLOEXEC"); |
| if flag & o_cloexec == o_cloexec { |
| // We do not need to do anything for this flag because `std` already sets it. |
| // (Technically we do not support *not* setting this flag, but we ignore that.) |
| mirror |= o_cloexec; |
| } |
| if this.tcx.sess.target.os == "linux" { |
| let o_tmpfile = this.eval_libc_i32("O_TMPFILE"); |
| if flag & o_tmpfile == o_tmpfile { |
| // if the flag contains `O_TMPFILE` then we return a graceful error |
| let eopnotsupp = this.eval_libc("EOPNOTSUPP"); |
| this.set_last_error(eopnotsupp)?; |
| return Ok(-1); |
| } |
| } |
| // If `flag` is not equal to `mirror`, there is an unsupported option enabled in `flag`, |
| // then we throw an error. |
| if flag != mirror { |
| throw_unsup_format!("unsupported flags {:#x}", flag & !mirror); |
| } |
| |
| let path = this.read_path_from_c_str(path)?; |
| |
| // Reject if isolation is enabled. |
| if let IsolatedOp::Reject(reject_with) = this.machine.isolated_op { |
| this.reject_in_isolation("`open`", reject_with)?; |
| this.set_last_error_from_io_error(ErrorKind::PermissionDenied)?; |
| return Ok(-1); |
| } |
| |
| let fd = options.open(path).map(|file| { |
| let fh = &mut this.machine.fds; |
| fh.insert_fd(FileDescriptor::new(FileHandle { file, writable })) |
| }); |
| |
| this.try_unwrap_io_result(fd) |
| } |
| |
| fn lseek64( |
| &mut self, |
| fd: i32, |
| offset: i128, |
| whence: i32, |
| ) -> InterpResult<'tcx, Scalar<Provenance>> { |
| let this = self.eval_context_mut(); |
| |
| // Isolation check is done via `FileDescriptor` trait. |
| |
| let seek_from = if whence == this.eval_libc_i32("SEEK_SET") { |
| SeekFrom::Start(u64::try_from(offset).unwrap()) |
| } else if whence == this.eval_libc_i32("SEEK_CUR") { |
| SeekFrom::Current(i64::try_from(offset).unwrap()) |
| } else if whence == this.eval_libc_i32("SEEK_END") { |
| SeekFrom::End(i64::try_from(offset).unwrap()) |
| } else { |
| let einval = this.eval_libc("EINVAL"); |
| this.set_last_error(einval)?; |
| return Ok(Scalar::from_i64(-1)); |
| }; |
| |
| let communicate = this.machine.communicate(); |
| |
| let Some(mut file_descriptor) = this.machine.fds.get_mut(fd) else { |
| return Ok(Scalar::from_i64(this.fd_not_found()?)); |
| }; |
| let result = file_descriptor |
| .seek(communicate, seek_from)? |
| .map(|offset| i64::try_from(offset).unwrap()); |
| drop(file_descriptor); |
| |
| let result = this.try_unwrap_io_result(result)?; |
| Ok(Scalar::from_i64(result)) |
| } |
| |
| fn unlink(&mut self, path_op: &OpTy<'tcx, Provenance>) -> InterpResult<'tcx, i32> { |
| let this = self.eval_context_mut(); |
| |
| let path = this.read_path_from_c_str(this.read_pointer(path_op)?)?; |
| |
| // Reject if isolation is enabled. |
| if let IsolatedOp::Reject(reject_with) = this.machine.isolated_op { |
| this.reject_in_isolation("`unlink`", reject_with)?; |
| this.set_last_error_from_io_error(ErrorKind::PermissionDenied)?; |
| return Ok(-1); |
| } |
| |
| let result = remove_file(path).map(|_| 0); |
| this.try_unwrap_io_result(result) |
| } |
| |
| fn symlink( |
| &mut self, |
| target_op: &OpTy<'tcx, Provenance>, |
| linkpath_op: &OpTy<'tcx, Provenance>, |
| ) -> InterpResult<'tcx, i32> { |
| #[cfg(unix)] |
| fn create_link(src: &Path, dst: &Path) -> std::io::Result<()> { |
| std::os::unix::fs::symlink(src, dst) |
| } |
| |
| #[cfg(windows)] |
| fn create_link(src: &Path, dst: &Path) -> std::io::Result<()> { |
| use std::os::windows::fs; |
| if src.is_dir() { fs::symlink_dir(src, dst) } else { fs::symlink_file(src, dst) } |
| } |
| |
| let this = self.eval_context_mut(); |
| let target = this.read_path_from_c_str(this.read_pointer(target_op)?)?; |
| let linkpath = this.read_path_from_c_str(this.read_pointer(linkpath_op)?)?; |
| |
| // Reject if isolation is enabled. |
| if let IsolatedOp::Reject(reject_with) = this.machine.isolated_op { |
| this.reject_in_isolation("`symlink`", reject_with)?; |
| this.set_last_error_from_io_error(ErrorKind::PermissionDenied)?; |
| return Ok(-1); |
| } |
| |
| let result = create_link(&target, &linkpath).map(|_| 0); |
| this.try_unwrap_io_result(result) |
| } |
| |
| fn macos_fbsd_stat( |
| &mut self, |
| path_op: &OpTy<'tcx, Provenance>, |
| buf_op: &OpTy<'tcx, Provenance>, |
| ) -> InterpResult<'tcx, Scalar<Provenance>> { |
| let this = self.eval_context_mut(); |
| |
| if !matches!(&*this.tcx.sess.target.os, "macos" | "freebsd") { |
| panic!("`macos_fbsd_stat` should not be called on {}", this.tcx.sess.target.os); |
| } |
| |
| let path_scalar = this.read_pointer(path_op)?; |
| let path = this.read_path_from_c_str(path_scalar)?.into_owned(); |
| |
| // Reject if isolation is enabled. |
| if let IsolatedOp::Reject(reject_with) = this.machine.isolated_op { |
| this.reject_in_isolation("`stat`", reject_with)?; |
| let eacc = this.eval_libc("EACCES"); |
| this.set_last_error(eacc)?; |
| return Ok(Scalar::from_i32(-1)); |
| } |
| |
| // `stat` always follows symlinks. |
| let metadata = match FileMetadata::from_path(this, &path, true)? { |
| Some(metadata) => metadata, |
| None => return Ok(Scalar::from_i32(-1)), // `FileMetadata` has set errno |
| }; |
| |
| Ok(Scalar::from_i32(this.macos_stat_write_buf(metadata, buf_op)?)) |
| } |
| |
| // `lstat` is used to get symlink metadata. |
| fn macos_fbsd_lstat( |
| &mut self, |
| path_op: &OpTy<'tcx, Provenance>, |
| buf_op: &OpTy<'tcx, Provenance>, |
| ) -> InterpResult<'tcx, Scalar<Provenance>> { |
| let this = self.eval_context_mut(); |
| |
| if !matches!(&*this.tcx.sess.target.os, "macos" | "freebsd") { |
| panic!("`macos_fbsd_lstat` should not be called on {}", this.tcx.sess.target.os); |
| } |
| |
| let path_scalar = this.read_pointer(path_op)?; |
| let path = this.read_path_from_c_str(path_scalar)?.into_owned(); |
| |
| // Reject if isolation is enabled. |
| if let IsolatedOp::Reject(reject_with) = this.machine.isolated_op { |
| this.reject_in_isolation("`lstat`", reject_with)?; |
| let eacc = this.eval_libc("EACCES"); |
| this.set_last_error(eacc)?; |
| return Ok(Scalar::from_i32(-1)); |
| } |
| |
| let metadata = match FileMetadata::from_path(this, &path, false)? { |
| Some(metadata) => metadata, |
| None => return Ok(Scalar::from_i32(-1)), // `FileMetadata` has set errno |
| }; |
| |
| Ok(Scalar::from_i32(this.macos_stat_write_buf(metadata, buf_op)?)) |
| } |
| |
| fn macos_fbsd_fstat( |
| &mut self, |
| fd_op: &OpTy<'tcx, Provenance>, |
| buf_op: &OpTy<'tcx, Provenance>, |
| ) -> InterpResult<'tcx, Scalar<Provenance>> { |
| let this = self.eval_context_mut(); |
| |
| if !matches!(&*this.tcx.sess.target.os, "macos" | "freebsd") { |
| panic!("`macos_fbsd_fstat` should not be called on {}", this.tcx.sess.target.os); |
| } |
| |
| let fd = this.read_scalar(fd_op)?.to_i32()?; |
| |
| // Reject if isolation is enabled. |
| if let IsolatedOp::Reject(reject_with) = this.machine.isolated_op { |
| this.reject_in_isolation("`fstat`", reject_with)?; |
| // Set error code as "EBADF" (bad fd) |
| return Ok(Scalar::from_i32(this.fd_not_found()?)); |
| } |
| |
| let metadata = match FileMetadata::from_fd(this, fd)? { |
| Some(metadata) => metadata, |
| None => return Ok(Scalar::from_i32(-1)), |
| }; |
| Ok(Scalar::from_i32(this.macos_stat_write_buf(metadata, buf_op)?)) |
| } |
| |
| fn linux_statx( |
| &mut self, |
| dirfd_op: &OpTy<'tcx, Provenance>, // Should be an `int` |
| pathname_op: &OpTy<'tcx, Provenance>, // Should be a `const char *` |
| flags_op: &OpTy<'tcx, Provenance>, // Should be an `int` |
| mask_op: &OpTy<'tcx, Provenance>, // Should be an `unsigned int` |
| statxbuf_op: &OpTy<'tcx, Provenance>, // Should be a `struct statx *` |
| ) -> InterpResult<'tcx, i32> { |
| let this = self.eval_context_mut(); |
| |
| this.assert_target_os("linux", "statx"); |
| |
| let dirfd = this.read_scalar(dirfd_op)?.to_i32()?; |
| let pathname_ptr = this.read_pointer(pathname_op)?; |
| let flags = this.read_scalar(flags_op)?.to_i32()?; |
| let _mask = this.read_scalar(mask_op)?.to_u32()?; |
| let statxbuf_ptr = this.read_pointer(statxbuf_op)?; |
| |
| // If the statxbuf or pathname pointers are null, the function fails with `EFAULT`. |
| if this.ptr_is_null(statxbuf_ptr)? || this.ptr_is_null(pathname_ptr)? { |
| let efault = this.eval_libc("EFAULT"); |
| this.set_last_error(efault)?; |
| return Ok(-1); |
| } |
| |
| let statxbuf = this.deref_pointer_as(statxbuf_op, this.libc_ty_layout("statx"))?; |
| |
| let path = this.read_path_from_c_str(pathname_ptr)?.into_owned(); |
| // See <https://github.com/rust-lang/rust/pull/79196> for a discussion of argument sizes. |
| let at_empty_path = this.eval_libc_i32("AT_EMPTY_PATH"); |
| let empty_path_flag = flags & at_empty_path == at_empty_path; |
| // We only support: |
| // * interpreting `path` as an absolute directory, |
| // * interpreting `path` as a path relative to `dirfd` when the latter is `AT_FDCWD`, or |
| // * interpreting `dirfd` as any file descriptor when `path` is empty and AT_EMPTY_PATH is |
| // set. |
| // Other behaviors cannot be tested from `libstd` and thus are not implemented. If you |
| // found this error, please open an issue reporting it. |
| if !(path.is_absolute() |
| || dirfd == this.eval_libc_i32("AT_FDCWD") |
| || (path.as_os_str().is_empty() && empty_path_flag)) |
| { |
| throw_unsup_format!( |
| "using statx is only supported with absolute paths, relative paths with the file \ |
| descriptor `AT_FDCWD`, and empty paths with the `AT_EMPTY_PATH` flag set and any \ |
| file descriptor" |
| ) |
| } |
| |
| // Reject if isolation is enabled. |
| if let IsolatedOp::Reject(reject_with) = this.machine.isolated_op { |
| this.reject_in_isolation("`statx`", reject_with)?; |
| let ecode = if path.is_absolute() || dirfd == this.eval_libc_i32("AT_FDCWD") { |
| // since `path` is provided, either absolute or |
| // relative to CWD, `EACCES` is the most relevant. |
| this.eval_libc("EACCES") |
| } else { |
| // `dirfd` is set to target file, and `path` is empty |
| // (or we would have hit the `throw_unsup_format` |
| // above). `EACCES` would violate the spec. |
| assert!(empty_path_flag); |
| this.eval_libc("EBADF") |
| }; |
| this.set_last_error(ecode)?; |
| return Ok(-1); |
| } |
| |
| // the `_mask_op` parameter specifies the file information that the caller requested. |
| // However `statx` is allowed to return information that was not requested or to not |
| // return information that was requested. This `mask` represents the information we can |
| // actually provide for any target. |
| let mut mask = this.eval_libc_u32("STATX_TYPE") | this.eval_libc_u32("STATX_SIZE"); |
| |
| // If the `AT_SYMLINK_NOFOLLOW` flag is set, we query the file's metadata without following |
| // symbolic links. |
| let follow_symlink = flags & this.eval_libc_i32("AT_SYMLINK_NOFOLLOW") == 0; |
| |
| // If the path is empty, and the AT_EMPTY_PATH flag is set, we query the open file |
| // represented by dirfd, whether it's a directory or otherwise. |
| let metadata = if path.as_os_str().is_empty() && empty_path_flag { |
| FileMetadata::from_fd(this, dirfd)? |
| } else { |
| FileMetadata::from_path(this, &path, follow_symlink)? |
| }; |
| let metadata = match metadata { |
| Some(metadata) => metadata, |
| None => return Ok(-1), |
| }; |
| |
| // The `mode` field specifies the type of the file and the permissions over the file for |
| // the owner, its group and other users. Given that we can only provide the file type |
| // without using platform specific methods, we only set the bits corresponding to the file |
| // type. This should be an `__u16` but `libc` provides its values as `u32`. |
| let mode: u16 = metadata |
| .mode |
| .to_u32()? |
| .try_into() |
| .unwrap_or_else(|_| bug!("libc contains bad value for constant")); |
| |
| // We need to set the corresponding bits of `mask` if the access, creation and modification |
| // times were available. Otherwise we let them be zero. |
| let (access_sec, access_nsec) = metadata |
| .accessed |
| .map(|tup| { |
| mask |= this.eval_libc_u32("STATX_ATIME"); |
| InterpResult::Ok(tup) |
| }) |
| .unwrap_or_else(|| Ok((0, 0)))?; |
| |
| let (created_sec, created_nsec) = metadata |
| .created |
| .map(|tup| { |
| mask |= this.eval_libc_u32("STATX_BTIME"); |
| InterpResult::Ok(tup) |
| }) |
| .unwrap_or_else(|| Ok((0, 0)))?; |
| |
| let (modified_sec, modified_nsec) = metadata |
| .modified |
| .map(|tup| { |
| mask |= this.eval_libc_u32("STATX_MTIME"); |
| InterpResult::Ok(tup) |
| }) |
| .unwrap_or_else(|| Ok((0, 0)))?; |
| |
| // Now we write everything to `statxbuf`. We write a zero for the unavailable fields. |
| this.write_int_fields_named( |
| &[ |
| ("stx_mask", mask.into()), |
| ("stx_blksize", 0), |
| ("stx_attributes", 0), |
| ("stx_nlink", 0), |
| ("stx_uid", 0), |
| ("stx_gid", 0), |
| ("stx_mode", mode.into()), |
| ("stx_ino", 0), |
| ("stx_size", metadata.size.into()), |
| ("stx_blocks", 0), |
| ("stx_attributes_mask", 0), |
| ("stx_rdev_major", 0), |
| ("stx_rdev_minor", 0), |
| ("stx_dev_major", 0), |
| ("stx_dev_minor", 0), |
| ], |
| &statxbuf, |
| )?; |
| #[rustfmt::skip] |
| this.write_int_fields_named( |
| &[ |
| ("tv_sec", access_sec.into()), |
| ("tv_nsec", access_nsec.into()), |
| ], |
| &this.project_field_named(&statxbuf, "stx_atime")?, |
| )?; |
| #[rustfmt::skip] |
| this.write_int_fields_named( |
| &[ |
| ("tv_sec", created_sec.into()), |
| ("tv_nsec", created_nsec.into()), |
| ], |
| &this.project_field_named(&statxbuf, "stx_btime")?, |
| )?; |
| #[rustfmt::skip] |
| this.write_int_fields_named( |
| &[ |
| ("tv_sec", 0.into()), |
| ("tv_nsec", 0.into()), |
| ], |
| &this.project_field_named(&statxbuf, "stx_ctime")?, |
| )?; |
| #[rustfmt::skip] |
| this.write_int_fields_named( |
| &[ |
| ("tv_sec", modified_sec.into()), |
| ("tv_nsec", modified_nsec.into()), |
| ], |
| &this.project_field_named(&statxbuf, "stx_mtime")?, |
| )?; |
| |
| Ok(0) |
| } |
| |
| fn rename( |
| &mut self, |
| oldpath_op: &OpTy<'tcx, Provenance>, |
| newpath_op: &OpTy<'tcx, Provenance>, |
| ) -> InterpResult<'tcx, i32> { |
| let this = self.eval_context_mut(); |
| |
| let oldpath_ptr = this.read_pointer(oldpath_op)?; |
| let newpath_ptr = this.read_pointer(newpath_op)?; |
| |
| if this.ptr_is_null(oldpath_ptr)? || this.ptr_is_null(newpath_ptr)? { |
| let efault = this.eval_libc("EFAULT"); |
| this.set_last_error(efault)?; |
| return Ok(-1); |
| } |
| |
| let oldpath = this.read_path_from_c_str(oldpath_ptr)?; |
| let newpath = this.read_path_from_c_str(newpath_ptr)?; |
| |
| // Reject if isolation is enabled. |
| if let IsolatedOp::Reject(reject_with) = this.machine.isolated_op { |
| this.reject_in_isolation("`rename`", reject_with)?; |
| this.set_last_error_from_io_error(ErrorKind::PermissionDenied)?; |
| return Ok(-1); |
| } |
| |
| let result = rename(oldpath, newpath).map(|_| 0); |
| |
| this.try_unwrap_io_result(result) |
| } |
| |
| fn mkdir( |
| &mut self, |
| path_op: &OpTy<'tcx, Provenance>, |
| mode_op: &OpTy<'tcx, Provenance>, |
| ) -> InterpResult<'tcx, i32> { |
| let this = self.eval_context_mut(); |
| |
| #[cfg_attr(not(unix), allow(unused_variables))] |
| let mode = if matches!(&*this.tcx.sess.target.os, "macos" | "freebsd") { |
| u32::from(this.read_scalar(mode_op)?.to_u16()?) |
| } else { |
| this.read_scalar(mode_op)?.to_u32()? |
| }; |
| |
| let path = this.read_path_from_c_str(this.read_pointer(path_op)?)?; |
| |
| // Reject if isolation is enabled. |
| if let IsolatedOp::Reject(reject_with) = this.machine.isolated_op { |
| this.reject_in_isolation("`mkdir`", reject_with)?; |
| this.set_last_error_from_io_error(ErrorKind::PermissionDenied)?; |
| return Ok(-1); |
| } |
| |
| #[cfg_attr(not(unix), allow(unused_mut))] |
| let mut builder = DirBuilder::new(); |
| |
| // If the host supports it, forward on the mode of the directory |
| // (i.e. permission bits and the sticky bit) |
| #[cfg(unix)] |
| { |
| use std::os::unix::fs::DirBuilderExt; |
| builder.mode(mode); |
| } |
| |
| let result = builder.create(path).map(|_| 0i32); |
| |
| this.try_unwrap_io_result(result) |
| } |
| |
| fn rmdir(&mut self, path_op: &OpTy<'tcx, Provenance>) -> InterpResult<'tcx, i32> { |
| let this = self.eval_context_mut(); |
| |
| let path = this.read_path_from_c_str(this.read_pointer(path_op)?)?; |
| |
| // Reject if isolation is enabled. |
| if let IsolatedOp::Reject(reject_with) = this.machine.isolated_op { |
| this.reject_in_isolation("`rmdir`", reject_with)?; |
| this.set_last_error_from_io_error(ErrorKind::PermissionDenied)?; |
| return Ok(-1); |
| } |
| |
| let result = remove_dir(path).map(|_| 0i32); |
| |
| this.try_unwrap_io_result(result) |
| } |
| |
| fn opendir( |
| &mut self, |
| name_op: &OpTy<'tcx, Provenance>, |
| ) -> InterpResult<'tcx, Scalar<Provenance>> { |
| let this = self.eval_context_mut(); |
| |
| let name = this.read_path_from_c_str(this.read_pointer(name_op)?)?; |
| |
| // Reject if isolation is enabled. |
| if let IsolatedOp::Reject(reject_with) = this.machine.isolated_op { |
| this.reject_in_isolation("`opendir`", reject_with)?; |
| let eacc = this.eval_libc("EACCES"); |
| this.set_last_error(eacc)?; |
| return Ok(Scalar::null_ptr(this)); |
| } |
| |
| let result = read_dir(name); |
| |
| match result { |
| Ok(dir_iter) => { |
| let id = this.machine.dirs.insert_new(dir_iter); |
| |
| // The libc API for opendir says that this method returns a pointer to an opaque |
| // structure, but we are returning an ID number. Thus, pass it as a scalar of |
| // pointer width. |
| Ok(Scalar::from_target_usize(id, this)) |
| } |
| Err(e) => { |
| this.set_last_error_from_io_error(e.kind())?; |
| Ok(Scalar::null_ptr(this)) |
| } |
| } |
| } |
| |
| fn linux_readdir64( |
| &mut self, |
| dirp_op: &OpTy<'tcx, Provenance>, |
| ) -> InterpResult<'tcx, Scalar<Provenance>> { |
| let this = self.eval_context_mut(); |
| |
| this.assert_target_os("linux", "readdir64"); |
| |
| let dirp = this.read_target_usize(dirp_op)?; |
| |
| // Reject if isolation is enabled. |
| if let IsolatedOp::Reject(reject_with) = this.machine.isolated_op { |
| this.reject_in_isolation("`readdir`", reject_with)?; |
| let eacc = this.eval_libc("EBADF"); |
| this.set_last_error(eacc)?; |
| return Ok(Scalar::null_ptr(this)); |
| } |
| |
| let open_dir = this.machine.dirs.streams.get_mut(&dirp).ok_or_else(|| { |
| err_unsup_format!("the DIR pointer passed to readdir64 did not come from opendir") |
| })?; |
| |
| let entry = match open_dir.read_dir.next() { |
| Some(Ok(dir_entry)) => { |
| // Write the directory entry into a newly allocated buffer. |
| // The name is written with write_bytes, while the rest of the |
| // dirent64 struct is written using write_int_fields. |
| |
| // For reference: |
| // pub struct dirent64 { |
| // pub d_ino: ino64_t, |
| // pub d_off: off64_t, |
| // pub d_reclen: c_ushort, |
| // pub d_type: c_uchar, |
| // pub d_name: [c_char; 256], |
| // } |
| |
| let mut name = dir_entry.file_name(); // not a Path as there are no separators! |
| name.push("\0"); // Add a NUL terminator |
| let name_bytes = name.as_encoded_bytes(); |
| let name_len = u64::try_from(name_bytes.len()).unwrap(); |
| |
| let dirent64_layout = this.libc_ty_layout("dirent64"); |
| let d_name_offset = dirent64_layout.fields.offset(4 /* d_name */).bytes(); |
| let size = d_name_offset.checked_add(name_len).unwrap(); |
| |
| let entry = this.allocate_ptr( |
| Size::from_bytes(size), |
| dirent64_layout.align.abi, |
| MiriMemoryKind::Runtime.into(), |
| )?; |
| let entry: Pointer<Option<Provenance>> = entry.into(); |
| |
| // If the host is a Unix system, fill in the inode number with its real value. |
| // If not, use 0 as a fallback value. |
| #[cfg(unix)] |
| let ino = std::os::unix::fs::DirEntryExt::ino(&dir_entry); |
| #[cfg(not(unix))] |
| let ino = 0u64; |
| |
| let file_type = this.file_type_to_d_type(dir_entry.file_type())?; |
| |
| this.write_int_fields_named( |
| &[ |
| ("d_ino", ino.into()), |
| ("d_off", 0), |
| ("d_reclen", size.into()), |
| ("d_type", file_type.into()), |
| ], |
| &this.ptr_to_mplace(entry, dirent64_layout), |
| )?; |
| |
| let name_ptr = entry.offset(Size::from_bytes(d_name_offset), this)?; |
| this.write_bytes_ptr(name_ptr, name_bytes.iter().copied())?; |
| |
| Some(entry) |
| } |
| None => { |
| // end of stream: return NULL |
| None |
| } |
| Some(Err(e)) => { |
| this.set_last_error_from_io_error(e.kind())?; |
| None |
| } |
| }; |
| |
| let open_dir = this.machine.dirs.streams.get_mut(&dirp).unwrap(); |
| let old_entry = std::mem::replace(&mut open_dir.entry, entry); |
| if let Some(old_entry) = old_entry { |
| this.deallocate_ptr(old_entry, None, MiriMemoryKind::Runtime.into())?; |
| } |
| |
| Ok(Scalar::from_maybe_pointer(entry.unwrap_or_else(Pointer::null), this)) |
| } |
| |
| fn macos_fbsd_readdir_r( |
| &mut self, |
| dirp_op: &OpTy<'tcx, Provenance>, |
| entry_op: &OpTy<'tcx, Provenance>, |
| result_op: &OpTy<'tcx, Provenance>, |
| ) -> InterpResult<'tcx, Scalar<Provenance>> { |
| let this = self.eval_context_mut(); |
| |
| if !matches!(&*this.tcx.sess.target.os, "macos" | "freebsd") { |
| panic!("`macos_fbsd_readdir_r` should not be called on {}", this.tcx.sess.target.os); |
| } |
| |
| let dirp = this.read_target_usize(dirp_op)?; |
| |
| // Reject if isolation is enabled. |
| if let IsolatedOp::Reject(reject_with) = this.machine.isolated_op { |
| this.reject_in_isolation("`readdir_r`", reject_with)?; |
| // Set error code as "EBADF" (bad fd) |
| return Ok(Scalar::from_i32(this.fd_not_found()?)); |
| } |
| |
| let open_dir = this.machine.dirs.streams.get_mut(&dirp).ok_or_else(|| { |
| err_unsup_format!("the DIR pointer passed to readdir_r did not come from opendir") |
| })?; |
| Ok(Scalar::from_i32(match open_dir.read_dir.next() { |
| Some(Ok(dir_entry)) => { |
| // Write into entry, write pointer to result, return 0 on success. |
| // The name is written with write_os_str_to_c_str, while the rest of the |
| // dirent struct is written using write_int_fields. |
| |
| // For reference: |
| // pub struct dirent { |
| // pub d_ino: u64, |
| // pub d_seekoff: u64, |
| // pub d_reclen: u16, |
| // pub d_namlen: u16, |
| // pub d_type: u8, |
| // pub d_name: [c_char; 1024], |
| // } |
| |
| let entry_place = this.deref_pointer_as(entry_op, this.libc_ty_layout("dirent"))?; |
| let name_place = this.project_field_named(&entry_place, "d_name")?; |
| |
| let file_name = dir_entry.file_name(); // not a Path as there are no separators! |
| let (name_fits, file_name_buf_len) = this.write_os_str_to_c_str( |
| &file_name, |
| name_place.ptr(), |
| name_place.layout.size.bytes(), |
| )?; |
| let file_name_len = file_name_buf_len.checked_sub(1).unwrap(); |
| if !name_fits { |
| throw_unsup_format!( |
| "a directory entry had a name too large to fit in libc::dirent" |
| ); |
| } |
| |
| // If the host is a Unix system, fill in the inode number with its real value. |
| // If not, use 0 as a fallback value. |
| #[cfg(unix)] |
| let ino = std::os::unix::fs::DirEntryExt::ino(&dir_entry); |
| #[cfg(not(unix))] |
| let ino = 0u64; |
| |
| let file_type = this.file_type_to_d_type(dir_entry.file_type())?; |
| |
| // macOS offset field is d_seekoff |
| if this.projectable_has_field(&entry_place, "d_seekoff") { |
| this.write_int_fields_named( |
| &[ |
| ("d_ino", ino.into()), |
| ("d_seekoff", 0), |
| ("d_reclen", 0), |
| ("d_namlen", file_name_len.into()), |
| ("d_type", file_type.into()), |
| ], |
| &entry_place, |
| )?; |
| } else if this.projectable_has_field(&entry_place, "d_off") { |
| // freebsd 12 and onwards had added the d_off field |
| this.write_int_fields_named( |
| &[ |
| ("d_fileno", ino.into()), |
| ("d_off", 0), |
| ("d_reclen", 0), |
| ("d_type", file_type.into()), |
| ("d_namlen", file_name_len.into()), |
| ], |
| &entry_place, |
| )?; |
| } else { |
| this.write_int_fields_named( |
| &[ |
| ("d_fileno", ino.into()), |
| ("d_reclen", 0), |
| ("d_type", file_type.into()), |
| ("d_namlen", file_name_len.into()), |
| ], |
| &entry_place, |
| )?; |
| } |
| |
| let result_place = this.deref_pointer(result_op)?; |
| this.write_scalar(this.read_scalar(entry_op)?, &result_place)?; |
| |
| 0 |
| } |
| None => { |
| // end of stream: return 0, assign *result=NULL |
| this.write_null(&this.deref_pointer(result_op)?)?; |
| 0 |
| } |
| Some(Err(e)) => |
| match e.raw_os_error() { |
| // return positive error number on error |
| Some(error) => error, |
| None => { |
| throw_unsup_format!( |
| "the error {} couldn't be converted to a return value", |
| e |
| ) |
| } |
| }, |
| })) |
| } |
| |
| fn closedir(&mut self, dirp_op: &OpTy<'tcx, Provenance>) -> InterpResult<'tcx, i32> { |
| let this = self.eval_context_mut(); |
| |
| let dirp = this.read_target_usize(dirp_op)?; |
| |
| // Reject if isolation is enabled. |
| if let IsolatedOp::Reject(reject_with) = this.machine.isolated_op { |
| this.reject_in_isolation("`closedir`", reject_with)?; |
| // Set error code as "EBADF" (bad fd) |
| return this.fd_not_found(); |
| } |
| |
| if let Some(open_dir) = this.machine.dirs.streams.remove(&dirp) { |
| if let Some(entry) = open_dir.entry { |
| this.deallocate_ptr(entry, None, MiriMemoryKind::Runtime.into())?; |
| } |
| drop(open_dir); |
| Ok(0) |
| } else { |
| this.fd_not_found() |
| } |
| } |
| |
| fn ftruncate64(&mut self, fd: i32, length: i128) -> InterpResult<'tcx, Scalar<Provenance>> { |
| let this = self.eval_context_mut(); |
| |
| // Reject if isolation is enabled. |
| if let IsolatedOp::Reject(reject_with) = this.machine.isolated_op { |
| this.reject_in_isolation("`ftruncate64`", reject_with)?; |
| // Set error code as "EBADF" (bad fd) |
| return Ok(Scalar::from_i32(this.fd_not_found()?)); |
| } |
| |
| let Some(file_descriptor) = this.machine.fds.get(fd) else { |
| return Ok(Scalar::from_i32(this.fd_not_found()?)); |
| }; |
| |
| // FIXME: Support ftruncate64 for all FDs |
| let FileHandle { file, writable } = |
| file_descriptor.downcast_ref::<FileHandle>().ok_or_else(|| { |
| err_unsup_format!("`ftruncate64` is only supported on file-backed file descriptors") |
| })?; |
| |
| if *writable { |
| if let Ok(length) = length.try_into() { |
| let result = file.set_len(length); |
| drop(file_descriptor); |
| let result = this.try_unwrap_io_result(result.map(|_| 0i32))?; |
| Ok(Scalar::from_i32(result)) |
| } else { |
| drop(file_descriptor); |
| let einval = this.eval_libc("EINVAL"); |
| this.set_last_error(einval)?; |
| Ok(Scalar::from_i32(-1)) |
| } |
| } else { |
| drop(file_descriptor); |
| // The file is not writable |
| let einval = this.eval_libc("EINVAL"); |
| this.set_last_error(einval)?; |
| Ok(Scalar::from_i32(-1)) |
| } |
| } |
| |
| fn fsync(&mut self, fd_op: &OpTy<'tcx, Provenance>) -> InterpResult<'tcx, i32> { |
| // On macOS, `fsync` (unlike `fcntl(F_FULLFSYNC)`) does not wait for the |
| // underlying disk to finish writing. In the interest of host compatibility, |
| // we conservatively implement this with `sync_all`, which |
| // *does* wait for the disk. |
| |
| let this = self.eval_context_mut(); |
| |
| let fd = this.read_scalar(fd_op)?.to_i32()?; |
| |
| // Reject if isolation is enabled. |
| if let IsolatedOp::Reject(reject_with) = this.machine.isolated_op { |
| this.reject_in_isolation("`fsync`", reject_with)?; |
| // Set error code as "EBADF" (bad fd) |
| return this.fd_not_found(); |
| } |
| |
| return self.ffullsync_fd(fd); |
| } |
| |
| fn ffullsync_fd(&mut self, fd: i32) -> InterpResult<'tcx, i32> { |
| let this = self.eval_context_mut(); |
| let Some(file_descriptor) = this.machine.fds.get(fd) else { |
| return Ok(this.fd_not_found()?); |
| }; |
| // Only regular files support synchronization. |
| let FileHandle { file, writable } = |
| file_descriptor.downcast_ref::<FileHandle>().ok_or_else(|| { |
| err_unsup_format!("`fsync` is only supported on file-backed file descriptors") |
| })?; |
| let io_result = maybe_sync_file(file, *writable, File::sync_all); |
| drop(file_descriptor); |
| this.try_unwrap_io_result(io_result) |
| } |
| |
| fn fdatasync(&mut self, fd_op: &OpTy<'tcx, Provenance>) -> InterpResult<'tcx, i32> { |
| let this = self.eval_context_mut(); |
| |
| let fd = this.read_scalar(fd_op)?.to_i32()?; |
| |
| // Reject if isolation is enabled. |
| if let IsolatedOp::Reject(reject_with) = this.machine.isolated_op { |
| this.reject_in_isolation("`fdatasync`", reject_with)?; |
| // Set error code as "EBADF" (bad fd) |
| return this.fd_not_found(); |
| } |
| |
| let Some(file_descriptor) = this.machine.fds.get(fd) else { |
| return Ok(this.fd_not_found()?); |
| }; |
| // Only regular files support synchronization. |
| let FileHandle { file, writable } = |
| file_descriptor.downcast_ref::<FileHandle>().ok_or_else(|| { |
| err_unsup_format!("`fdatasync` is only supported on file-backed file descriptors") |
| })?; |
| let io_result = maybe_sync_file(file, *writable, File::sync_data); |
| drop(file_descriptor); |
| this.try_unwrap_io_result(io_result) |
| } |
| |
| fn sync_file_range( |
| &mut self, |
| fd_op: &OpTy<'tcx, Provenance>, |
| offset_op: &OpTy<'tcx, Provenance>, |
| nbytes_op: &OpTy<'tcx, Provenance>, |
| flags_op: &OpTy<'tcx, Provenance>, |
| ) -> InterpResult<'tcx, Scalar<Provenance>> { |
| let this = self.eval_context_mut(); |
| |
| let fd = this.read_scalar(fd_op)?.to_i32()?; |
| let offset = this.read_scalar(offset_op)?.to_i64()?; |
| let nbytes = this.read_scalar(nbytes_op)?.to_i64()?; |
| let flags = this.read_scalar(flags_op)?.to_i32()?; |
| |
| if offset < 0 || nbytes < 0 { |
| let einval = this.eval_libc("EINVAL"); |
| this.set_last_error(einval)?; |
| return Ok(Scalar::from_i32(-1)); |
| } |
| let allowed_flags = this.eval_libc_i32("SYNC_FILE_RANGE_WAIT_BEFORE") |
| | this.eval_libc_i32("SYNC_FILE_RANGE_WRITE") |
| | this.eval_libc_i32("SYNC_FILE_RANGE_WAIT_AFTER"); |
| if flags & allowed_flags != flags { |
| let einval = this.eval_libc("EINVAL"); |
| this.set_last_error(einval)?; |
| return Ok(Scalar::from_i32(-1)); |
| } |
| |
| // Reject if isolation is enabled. |
| if let IsolatedOp::Reject(reject_with) = this.machine.isolated_op { |
| this.reject_in_isolation("`sync_file_range`", reject_with)?; |
| // Set error code as "EBADF" (bad fd) |
| return Ok(Scalar::from_i32(this.fd_not_found()?)); |
| } |
| |
| let Some(file_descriptor) = this.machine.fds.get(fd) else { |
| return Ok(Scalar::from_i32(this.fd_not_found()?)); |
| }; |
| // Only regular files support synchronization. |
| let FileHandle { file, writable } = |
| file_descriptor.downcast_ref::<FileHandle>().ok_or_else(|| { |
| err_unsup_format!( |
| "`sync_data_range` is only supported on file-backed file descriptors" |
| ) |
| })?; |
| let io_result = maybe_sync_file(file, *writable, File::sync_data); |
| drop(file_descriptor); |
| Ok(Scalar::from_i32(this.try_unwrap_io_result(io_result)?)) |
| } |
| |
| fn readlink( |
| &mut self, |
| pathname_op: &OpTy<'tcx, Provenance>, |
| buf_op: &OpTy<'tcx, Provenance>, |
| bufsize_op: &OpTy<'tcx, Provenance>, |
| ) -> InterpResult<'tcx, i64> { |
| let this = self.eval_context_mut(); |
| |
| let pathname = this.read_path_from_c_str(this.read_pointer(pathname_op)?)?; |
| let buf = this.read_pointer(buf_op)?; |
| let bufsize = this.read_target_usize(bufsize_op)?; |
| |
| // Reject if isolation is enabled. |
| if let IsolatedOp::Reject(reject_with) = this.machine.isolated_op { |
| this.reject_in_isolation("`readlink`", reject_with)?; |
| let eacc = this.eval_libc("EACCES"); |
| this.set_last_error(eacc)?; |
| return Ok(-1); |
| } |
| |
| let result = std::fs::read_link(pathname); |
| match result { |
| Ok(resolved) => { |
| // 'readlink' truncates the resolved path if the provided buffer is not large |
| // enough, and does *not* add a null terminator. That means we cannot use the usual |
| // `write_path_to_c_str` and have to re-implement parts of it ourselves. |
| let resolved = this.convert_path( |
| Cow::Borrowed(resolved.as_ref()), |
| crate::shims::os_str::PathConversion::HostToTarget, |
| ); |
| let mut path_bytes = resolved.as_encoded_bytes(); |
| let bufsize: usize = bufsize.try_into().unwrap(); |
| if path_bytes.len() > bufsize { |
| path_bytes = &path_bytes[..bufsize] |
| } |
| this.write_bytes_ptr(buf, path_bytes.iter().copied())?; |
| Ok(path_bytes.len().try_into().unwrap()) |
| } |
| Err(e) => { |
| this.set_last_error_from_io_error(e.kind())?; |
| Ok(-1) |
| } |
| } |
| } |
| |
| #[cfg_attr(not(unix), allow(unused))] |
| fn isatty( |
| &mut self, |
| miri_fd: &OpTy<'tcx, Provenance>, |
| ) -> InterpResult<'tcx, Scalar<Provenance>> { |
| let this = self.eval_context_mut(); |
| // "returns 1 if fd is an open file descriptor referring to a terminal; |
| // otherwise 0 is returned, and errno is set to indicate the error" |
| let fd = this.read_scalar(miri_fd)?.to_i32()?; |
| let error = if let Some(fd) = this.machine.fds.get(fd) { |
| if fd.is_tty(this.machine.communicate()) { |
| return Ok(Scalar::from_i32(1)); |
| } else { |
| this.eval_libc("ENOTTY") |
| } |
| } else { |
| // FD does not exist |
| this.eval_libc("EBADF") |
| }; |
| this.set_last_error(error)?; |
| Ok(Scalar::from_i32(0)) |
| } |
| |
| fn realpath( |
| &mut self, |
| path_op: &OpTy<'tcx, Provenance>, |
| processed_path_op: &OpTy<'tcx, Provenance>, |
| ) -> InterpResult<'tcx, Scalar<Provenance>> { |
| let this = self.eval_context_mut(); |
| this.assert_target_os_is_unix("realpath"); |
| |
| let pathname = this.read_path_from_c_str(this.read_pointer(path_op)?)?; |
| let processed_ptr = this.read_pointer(processed_path_op)?; |
| |
| // Reject if isolation is enabled. |
| if let IsolatedOp::Reject(reject_with) = this.machine.isolated_op { |
| this.reject_in_isolation("`realpath`", reject_with)?; |
| let eacc = this.eval_libc("EACCES"); |
| this.set_last_error(eacc)?; |
| return Ok(Scalar::from_target_usize(0, this)); |
| } |
| |
| let result = std::fs::canonicalize(pathname); |
| match result { |
| Ok(resolved) => { |
| let path_max = this |
| .eval_libc_i32("PATH_MAX") |
| .try_into() |
| .expect("PATH_MAX does not fit in u64"); |
| let dest = if this.ptr_is_null(processed_ptr)? { |
| // POSIX says behavior when passing a null pointer is implementation-defined, |
| // but GNU/linux, freebsd, netbsd, bionic/android, and macos all treat a null pointer |
| // similarly to: |
| // |
| // "If resolved_path is specified as NULL, then realpath() uses |
| // malloc(3) to allocate a buffer of up to PATH_MAX bytes to hold |
| // the resolved pathname, and returns a pointer to this buffer. The |
| // caller should deallocate this buffer using free(3)." |
| // <https://man7.org/linux/man-pages/man3/realpath.3.html> |
| this.alloc_path_as_c_str(&resolved, MiriMemoryKind::C.into())? |
| } else { |
| let (wrote_path, _) = |
| this.write_path_to_c_str(&resolved, processed_ptr, path_max)?; |
| |
| if !wrote_path { |
| // Note that we do not explicitly handle `FILENAME_MAX` |
| // (different from `PATH_MAX` above) as it is Linux-specific and |
| // seems like a bit of a mess anyway: <https://eklitzke.org/path-max-is-tricky>. |
| let enametoolong = this.eval_libc("ENAMETOOLONG"); |
| this.set_last_error(enametoolong)?; |
| return Ok(Scalar::from_target_usize(0, this)); |
| } |
| processed_ptr |
| }; |
| |
| Ok(Scalar::from_maybe_pointer(dest, this)) |
| } |
| Err(e) => { |
| this.set_last_error_from_io_error(e.kind())?; |
| Ok(Scalar::from_target_usize(0, this)) |
| } |
| } |
| } |
| fn mkstemp(&mut self, template_op: &OpTy<'tcx, Provenance>) -> InterpResult<'tcx, i32> { |
| use rand::seq::SliceRandom; |
| |
| // POSIX defines the template string. |
| const TEMPFILE_TEMPLATE_STR: &str = "XXXXXX"; |
| |
| let this = self.eval_context_mut(); |
| this.assert_target_os_is_unix("mkstemp"); |
| |
| // POSIX defines the maximum number of attempts before failure. |
| // |
| // `mkstemp()` relies on `tmpnam()` which in turn relies on `TMP_MAX`. |
| // POSIX says this about `TMP_MAX`: |
| // * Minimum number of unique filenames generated by `tmpnam()`. |
| // * Maximum number of times an application can call `tmpnam()` reliably. |
| // * The value of `TMP_MAX` is at least 25. |
| // * On XSI-conformant systems, the value of `TMP_MAX` is at least 10000. |
| // See <https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/stdio.h.html>. |
| let max_attempts = this.eval_libc_u32("TMP_MAX"); |
| |
| // Get the raw bytes from the template -- as a byte slice, this is a string in the target |
| // (and the target is unix, so a byte slice is the right representation). |
| let template_ptr = this.read_pointer(template_op)?; |
| let mut template = this.eval_context_ref().read_c_str(template_ptr)?.to_owned(); |
| let template_bytes = template.as_mut_slice(); |
| |
| // Reject if isolation is enabled. |
| if let IsolatedOp::Reject(reject_with) = this.machine.isolated_op { |
| this.reject_in_isolation("`mkstemp`", reject_with)?; |
| let eacc = this.eval_libc("EACCES"); |
| this.set_last_error(eacc)?; |
| return Ok(-1); |
| } |
| |
| // Get the bytes of the suffix we expect in _target_ encoding. |
| let suffix_bytes = TEMPFILE_TEMPLATE_STR.as_bytes(); |
| |
| // At this point we have one `&[u8]` that represents the template and one `&[u8]` |
| // that represents the expected suffix. |
| |
| // Now we figure out the index of the slice we expect to contain the suffix. |
| let start_pos = template_bytes.len().saturating_sub(suffix_bytes.len()); |
| let end_pos = template_bytes.len(); |
| let last_six_char_bytes = &template_bytes[start_pos..end_pos]; |
| |
| // If we don't find the suffix, it is an error. |
| if last_six_char_bytes != suffix_bytes { |
| let einval = this.eval_libc("EINVAL"); |
| this.set_last_error(einval)?; |
| return Ok(-1); |
| } |
| |
| // At this point we know we have 6 ASCII 'X' characters as a suffix. |
| |
| // From <https://github.com/lattera/glibc/blob/895ef79e04a953cac1493863bcae29ad85657ee1/sysdeps/posix/tempname.c#L175> |
| const SUBSTITUTIONS: &[char; 62] = &[ |
| 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', |
| 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', |
| 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', |
| 'Z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', |
| ]; |
| |
| // The file is opened with specific options, which Rust does not expose in a portable way. |
| // So we use specific APIs depending on the host OS. |
| let mut fopts = OpenOptions::new(); |
| fopts.read(true).write(true).create_new(true); |
| |
| #[cfg(unix)] |
| { |
| use std::os::unix::fs::OpenOptionsExt; |
| fopts.mode(0o600); |
| // Do not allow others to read or modify this file. |
| fopts.custom_flags(libc::O_EXCL); |
| } |
| #[cfg(windows)] |
| { |
| use std::os::windows::fs::OpenOptionsExt; |
| // Do not allow others to read or modify this file. |
| fopts.share_mode(0); |
| } |
| |
| // If the generated file already exists, we will try again `max_attempts` many times. |
| for _ in 0..max_attempts { |
| let rng = this.machine.rng.get_mut(); |
| |
| // Generate a random unique suffix. |
| let unique_suffix = SUBSTITUTIONS.choose_multiple(rng, 6).collect::<String>(); |
| |
| // Replace the template string with the random string. |
| template_bytes[start_pos..end_pos].copy_from_slice(unique_suffix.as_bytes()); |
| |
| // Write the modified template back to the passed in pointer to maintain POSIX semantics. |
| this.write_bytes_ptr(template_ptr, template_bytes.iter().copied())?; |
| |
| // To actually open the file, turn this into a host OsString. |
| let p = bytes_to_os_str(template_bytes)?.to_os_string(); |
| |
| let possibly_unique = std::env::temp_dir().join::<PathBuf>(p.into()); |
| |
| let file = fopts.open(possibly_unique); |
| |
| match file { |
| Ok(f) => { |
| let fh = &mut this.machine.fds; |
| let fd = |
| fh.insert_fd(FileDescriptor::new(FileHandle { file: f, writable: true })); |
| return Ok(fd); |
| } |
| Err(e) => |
| match e.kind() { |
| // If the random file already exists, keep trying. |
| ErrorKind::AlreadyExists => continue, |
| // Any other errors are returned to the caller. |
| _ => { |
| // "On error, -1 is returned, and errno is set to |
| // indicate the error" |
| this.set_last_error_from_io_error(e.kind())?; |
| return Ok(-1); |
| } |
| }, |
| } |
| } |
| |
| // We ran out of attempts to create the file, return an error. |
| let eexist = this.eval_libc("EEXIST"); |
| this.set_last_error(eexist)?; |
| Ok(-1) |
| } |
| } |
| |
| /// Extracts the number of seconds and nanoseconds elapsed between `time` and the unix epoch when |
| /// `time` is Ok. Returns `None` if `time` is an error. Fails if `time` happens before the unix |
| /// epoch. |
| fn extract_sec_and_nsec<'tcx>( |
| time: std::io::Result<SystemTime>, |
| ) -> InterpResult<'tcx, Option<(u64, u32)>> { |
| time.ok() |
| .map(|time| { |
| let duration = system_time_to_duration(&time)?; |
| Ok((duration.as_secs(), duration.subsec_nanos())) |
| }) |
| .transpose() |
| } |
| |
| /// Stores a file's metadata in order to avoid code duplication in the different metadata related |
| /// shims. |
| struct FileMetadata { |
| mode: Scalar<Provenance>, |
| size: u64, |
| created: Option<(u64, u32)>, |
| accessed: Option<(u64, u32)>, |
| modified: Option<(u64, u32)>, |
| } |
| |
| impl FileMetadata { |
| fn from_path<'tcx>( |
| ecx: &mut MiriInterpCx<'_, 'tcx>, |
| path: &Path, |
| follow_symlink: bool, |
| ) -> InterpResult<'tcx, Option<FileMetadata>> { |
| let metadata = |
| if follow_symlink { std::fs::metadata(path) } else { std::fs::symlink_metadata(path) }; |
| |
| FileMetadata::from_meta(ecx, metadata) |
| } |
| |
| fn from_fd<'tcx>( |
| ecx: &mut MiriInterpCx<'_, 'tcx>, |
| fd: i32, |
| ) -> InterpResult<'tcx, Option<FileMetadata>> { |
| let Some(file_descriptor) = ecx.machine.fds.get(fd) else { |
| return ecx.fd_not_found().map(|_: i32| None); |
| }; |
| |
| let file = &file_descriptor |
| .downcast_ref::<FileHandle>() |
| .ok_or_else(|| { |
| err_unsup_format!( |
| "obtaining metadata is only supported on file-backed file descriptors" |
| ) |
| })? |
| .file; |
| |
| let metadata = file.metadata(); |
| drop(file_descriptor); |
| FileMetadata::from_meta(ecx, metadata) |
| } |
| |
| fn from_meta<'tcx>( |
| ecx: &mut MiriInterpCx<'_, 'tcx>, |
| metadata: Result<std::fs::Metadata, std::io::Error>, |
| ) -> InterpResult<'tcx, Option<FileMetadata>> { |
| let metadata = match metadata { |
| Ok(metadata) => metadata, |
| Err(e) => { |
| ecx.set_last_error_from_io_error(e.kind())?; |
| return Ok(None); |
| } |
| }; |
| |
| let file_type = metadata.file_type(); |
| |
| let mode_name = if file_type.is_file() { |
| "S_IFREG" |
| } else if file_type.is_dir() { |
| "S_IFDIR" |
| } else { |
| "S_IFLNK" |
| }; |
| |
| let mode = ecx.eval_libc(mode_name); |
| |
| let size = metadata.len(); |
| |
| let created = extract_sec_and_nsec(metadata.created())?; |
| let accessed = extract_sec_and_nsec(metadata.accessed())?; |
| let modified = extract_sec_and_nsec(metadata.modified())?; |
| |
| // FIXME: Provide more fields using platform specific methods. |
| Ok(Some(FileMetadata { mode, size, created, accessed, modified })) |
| } |
| } |
