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Input: serport - add compat handling for SPIOCSTYPE ioctl

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When running a 32-bit inputattach utility in a 64-bit system, there will be
error code "inputattach: can't set device type". This is caused by the
serport device driver not supporting compat_ioctl, so that SPIOCSTYPE ioctl
fails.

Cc: stable@vger.kernel.org
Signed-off-by: John Sung <penmount.touch@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
John Sung 2014-09-09 10:06:51 -07:00 committed by Dmitry Torokhov
parent 58e4aeee39
commit a80d8b0275
1 changed files with 39 additions and 8 deletions
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47
drivers/input/serio/serport.c
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@ -21,6 +21,7 @@
#include <linux/init.h> #include <linux/init.h>
#include <linux/serio.h> #include <linux/serio.h>
#include <linux/tty.h> #include <linux/tty.h>
#include <linux/compat.h>
MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION("Input device TTY line discipline"); MODULE_DESCRIPTION("Input device TTY line discipline");
@ -198,29 +199,56 @@ static ssize_t serport_ldisc_read(struct tty_struct * tty, struct file * file, u
return 0; return 0;
} }
static void serport_set_type(struct tty_struct *tty, unsigned long type)
{
struct serport *serport = tty->disc_data;
serport->id.proto = type & 0x000000ff;
serport->id.id = (type & 0x0000ff00) >> 8;
serport->id.extra = (type & 0x00ff0000) >> 16;
}
/* /*
* serport_ldisc_ioctl() allows to set the port protocol, and device ID * serport_ldisc_ioctl() allows to set the port protocol, and device ID
*/ */
static int serport_ldisc_ioctl(struct tty_struct * tty, struct file * file, unsigned int cmd, unsigned long arg) static int serport_ldisc_ioctl(struct tty_struct *tty, struct file *file,
unsigned int cmd, unsigned long arg)
{ {
struct serport *serport = (struct serport*) tty->disc_data;
unsigned long type;
if (cmd == SPIOCSTYPE) { if (cmd == SPIOCSTYPE) {
unsigned long type;
if (get_user(type, (unsigned long __user *) arg)) if (get_user(type, (unsigned long __user *) arg))
return -EFAULT; return -EFAULT;
serport->id.proto = type & 0x000000ff; serport_set_type(tty, type);
serport->id.id = (type & 0x0000ff00) >> 8;
serport->id.extra = (type & 0x00ff0000) >> 16;
return 0; return 0;
} }
return -EINVAL; return -EINVAL;
} }
#ifdef CONFIG_COMPAT
#define COMPAT_SPIOCSTYPE _IOW('q', 0x01, compat_ulong_t)
static long serport_ldisc_compat_ioctl(struct tty_struct *tty,
struct file *file,
unsigned int cmd, unsigned long arg)
{
if (cmd == COMPAT_SPIOCSTYPE) {
void __user *uarg = compat_ptr(arg);
compat_ulong_t compat_type;
if (get_user(compat_type, (compat_ulong_t __user *)uarg))
return -EFAULT;
serport_set_type(tty, compat_type);
return 0;
}
return -EINVAL;
}
#endif
static void serport_ldisc_write_wakeup(struct tty_struct * tty) static void serport_ldisc_write_wakeup(struct tty_struct * tty)
{ {
struct serport *serport = (struct serport *) tty->disc_data; struct serport *serport = (struct serport *) tty->disc_data;
@ -243,6 +271,9 @@ static struct tty_ldisc_ops serport_ldisc = {
.close = serport_ldisc_close, .close = serport_ldisc_close,
.read = serport_ldisc_read, .read = serport_ldisc_read,
.ioctl = serport_ldisc_ioctl, .ioctl = serport_ldisc_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = serport_ldisc_compat_ioctl,
#endif
.receive_buf = serport_ldisc_receive, .receive_buf = serport_ldisc_receive,
.write_wakeup = serport_ldisc_write_wakeup .write_wakeup = serport_ldisc_write_wakeup
}; };