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tty_ioctl(): start taking TIOC[SG]SERIAL into separate methods

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->set_serial() and ->get_serial() resp., both taking tty and
a kernel pointer to serial_struct.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2018-09-11 21:53:32 -04:00
parent 7eaec37e04
commit 2f46a2c1d4
2 changed files with 33 additions and 5 deletions
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35
drivers/tty/tty_io.c
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@@ -2456,22 +2456,40 @@ static int tty_tiocgicount(struct tty_struct *tty, void __user *arg)
return 0;
}
static void tty_warn_deprecated_flags(struct serial_struct __user *ss)
static int tty_tiocsserial(struct tty_struct *tty, struct serial_struct __user *ss)
{
static DEFINE_RATELIMIT_STATE(depr_flags,
DEFAULT_RATELIMIT_INTERVAL,
DEFAULT_RATELIMIT_BURST);
char comm[TASK_COMM_LEN];
struct serial_struct v;
int flags;
if (get_user(flags, &ss->flags))
return;
if (copy_from_user(&v, ss, sizeof(struct serial_struct)))
return -EFAULT;
flags &= ASYNC_DEPRECATED;
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 -ENOIOCTLCMD;
return tty->ops->set_serial(tty, &v);
}
static int tty_tiocgserial(struct tty_struct *tty, struct serial_struct __user *ss)
{
struct serial_struct v;
int err;
memset(&v, 0, sizeof(struct serial_struct));
if (!tty->ops->get_serial)
return -ENOIOCTLCMD;
err = tty->ops->get_serial(tty, &v);
if (!err && copy_to_user(ss, &v, sizeof(struct serial_struct)))
err = -EFAULT;
return err;
}
/*
@@ -2603,7 +2621,14 @@ long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
}
break;
case TIOCSSERIAL:
tty_warn_deprecated_flags(p);
retval = tty_tiocsserial(tty, p);
if (retval != -ENOIOCTLCMD)
return retval;
break;
case TIOCGSERIAL:
retval = tty_tiocgserial(tty, p);
if (retval != -ENOIOCTLCMD)
return retval;
break;
case TIOCGPTPEER:
/* Special because the struct file is needed */