diff options
Diffstat (limited to 'drivers/tty/tty_io.c')
| -rw-r--r-- | drivers/tty/tty_io.c | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c index 15d60ba13187..ccc0055b2dfc 100644 --- a/drivers/tty/tty_io.c +++ b/drivers/tty/tty_io.c @@ -2651,6 +2651,81 @@ long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg) } #ifdef CONFIG_COMPAT + +struct serial_struct32 { + compat_int_t type; + compat_int_t line; + compat_uint_t port; + compat_int_t irq; + compat_int_t flags; + compat_int_t xmit_fifo_size; + compat_int_t custom_divisor; + compat_int_t baud_base; + unsigned short close_delay; + char io_type; + char reserved_char[1]; + compat_int_t hub6; + unsigned short closing_wait; /* time to wait before closing */ + unsigned short closing_wait2; /* no longer used... */ + compat_uint_t iomem_base; + unsigned short iomem_reg_shift; + unsigned int port_high; + /* compat_ulong_t iomap_base FIXME */ + compat_int_t reserved[1]; +}; + +static int compat_tty_tiocsserial(struct tty_struct *tty, + struct serial_struct32 __user *ss) +{ + static DEFINE_RATELIMIT_STATE(depr_flags, + DEFAULT_RATELIMIT_INTERVAL, + DEFAULT_RATELIMIT_BURST); + char comm[TASK_COMM_LEN]; + struct serial_struct32 v32; + struct serial_struct v; + int flags; + + if (copy_from_user(&v32, ss, sizeof(struct serial_struct32))) + return -EFAULT; + + memcpy(&v, &v32, offsetof(struct serial_struct32, iomem_base)); + v.iomem_base = compat_ptr(v32.iomem_base); + v.iomem_reg_shift = v32.iomem_reg_shift; + v.port_high = v32.port_high; + v.iomap_base = 0; + + flags = v.flags & ASYNC_DEPRECATED; + + if (flags && __ratelimit(&depr_flags)) + pr_warn("%s: '%s' is using deprecated serial flags (with no effect): %.8x\n", + __func__, get_task_comm(comm, current), flags); + if (!tty->ops->set_serial) + return -ENOTTY; + return tty->ops->set_serial(tty, &v); +} + +static int compat_tty_tiocgserial(struct tty_struct *tty, + struct serial_struct32 __user *ss) +{ + struct serial_struct32 v32; + struct serial_struct v; + int err; + memset(&v, 0, sizeof(struct serial_struct)); + + if (!tty->ops->set_serial) + return -ENOTTY; + err = tty->ops->get_serial(tty, &v); + if (!err) { + memcpy(&v32, &v, offsetof(struct serial_struct32, iomem_base)); + v32.iomem_base = (unsigned long)v.iomem_base >> 32 ? + 0xfffffff : ptr_to_compat(v.iomem_base); + v32.iomem_reg_shift = v.iomem_reg_shift; + v32.port_high = v.port_high; + if (copy_to_user(ss, &v32, sizeof(struct serial_struct32))) + err = -EFAULT; + } + return err; +} static long tty_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { @@ -2736,6 +2811,12 @@ static long tty_compat_ioctl(struct file *file, unsigned int cmd, if (tty_paranoia_check(tty, file_inode(file), "tty_ioctl")) return -EINVAL; + switch (cmd) { + case TIOCSSERIAL: + return compat_tty_tiocsserial(tty, compat_ptr(arg)); + case TIOCGSERIAL: + return compat_tty_tiocgserial(tty, compat_ptr(arg)); + } if (tty->ops->compat_ioctl) { retval = tty->ops->compat_ioctl(tty, cmd, arg); if (retval != -ENOIOCTLCMD) |