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take compat TIOC[SG]SERIAL treatment into tty_compat_ioctl()

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Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Al Viro 2018-09-12 11:28:34 -04:00
commit 7765435030
2 changed files with 81 additions and 67 deletions
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81
drivers/tty/tty_io.c
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@ -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)