diff options
Diffstat (limited to 'include/uapi/linux/landlock.h')
| -rw-r--r-- | include/uapi/linux/landlock.h | 38 |
1 files changed, 30 insertions, 8 deletions
diff --git a/include/uapi/linux/landlock.h b/include/uapi/linux/landlock.h index 25c8d7677539..68625e728f43 100644 --- a/include/uapi/linux/landlock.h +++ b/include/uapi/linux/landlock.h @@ -128,7 +128,7 @@ struct landlock_net_port_attr { * files and directories. Files or directories opened before the sandboxing * are not subject to these restrictions. * - * A file can only receive these access rights: + * The following access rights apply only to files: * * - %LANDLOCK_ACCESS_FS_EXECUTE: Execute a file. * - %LANDLOCK_ACCESS_FS_WRITE_FILE: Open a file with write access. Note that @@ -138,12 +138,13 @@ struct landlock_net_port_attr { * - %LANDLOCK_ACCESS_FS_READ_FILE: Open a file with read access. * - %LANDLOCK_ACCESS_FS_TRUNCATE: Truncate a file with :manpage:`truncate(2)`, * :manpage:`ftruncate(2)`, :manpage:`creat(2)`, or :manpage:`open(2)` with - * ``O_TRUNC``. Whether an opened file can be truncated with - * :manpage:`ftruncate(2)` is determined during :manpage:`open(2)`, in the - * same way as read and write permissions are checked during - * :manpage:`open(2)` using %LANDLOCK_ACCESS_FS_READ_FILE and - * %LANDLOCK_ACCESS_FS_WRITE_FILE. This access right is available since the - * third version of the Landlock ABI. + * ``O_TRUNC``. This access right is available since the third version of the + * Landlock ABI. + * + * Whether an opened file can be truncated with :manpage:`ftruncate(2)` or used + * with `ioctl(2)` is determined during :manpage:`open(2)`, in the same way as + * read and write permissions are checked during :manpage:`open(2)` using + * %LANDLOCK_ACCESS_FS_READ_FILE and %LANDLOCK_ACCESS_FS_WRITE_FILE. * * A directory can receive access rights related to files or directories. The * following access right is applied to the directory itself, and the @@ -198,13 +199,33 @@ struct landlock_net_port_attr { * If multiple requirements are not met, the ``EACCES`` error code takes * precedence over ``EXDEV``. * + * The following access right applies both to files and directories: + * + * - %LANDLOCK_ACCESS_FS_IOCTL_DEV: Invoke :manpage:`ioctl(2)` commands on an opened + * character or block device. + * + * This access right applies to all `ioctl(2)` commands implemented by device + * drivers. However, the following common IOCTL commands continue to be + * invokable independent of the %LANDLOCK_ACCESS_FS_IOCTL_DEV right: + * + * * IOCTL commands targeting file descriptors (``FIOCLEX``, ``FIONCLEX``), + * * IOCTL commands targeting file descriptions (``FIONBIO``, ``FIOASYNC``), + * * IOCTL commands targeting file systems (``FIFREEZE``, ``FITHAW``, + * ``FIGETBSZ``, ``FS_IOC_GETFSUUID``, ``FS_IOC_GETFSSYSFSPATH``) + * * Some IOCTL commands which do not make sense when used with devices, but + * whose implementations are safe and return the right error codes + * (``FS_IOC_FIEMAP``, ``FICLONE``, ``FICLONERANGE``, ``FIDEDUPERANGE``) + * + * This access right is available since the fifth version of the Landlock + * ABI. + * * .. warning:: * * It is currently not possible to restrict some file-related actions * accessible through these syscall families: :manpage:`chdir(2)`, * :manpage:`stat(2)`, :manpage:`flock(2)`, :manpage:`chmod(2)`, * :manpage:`chown(2)`, :manpage:`setxattr(2)`, :manpage:`utime(2)`, - * :manpage:`ioctl(2)`, :manpage:`fcntl(2)`, :manpage:`access(2)`. + * :manpage:`fcntl(2)`, :manpage:`access(2)`. * Future Landlock evolutions will enable to restrict them. */ /* clang-format off */ @@ -223,6 +244,7 @@ struct landlock_net_port_attr { #define LANDLOCK_ACCESS_FS_MAKE_SYM (1ULL << 12) #define LANDLOCK_ACCESS_FS_REFER (1ULL << 13) #define LANDLOCK_ACCESS_FS_TRUNCATE (1ULL << 14) +#define LANDLOCK_ACCESS_FS_IOCTL_DEV (1ULL << 15) /* clang-format on */ /** |