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tty: Support compat_ioctl get/set termios_locked

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When running a Fedora 15 (x86) on an x86_64 kernel, in the boot process
plymouthd complains about those two missing ioctls:
[    2.581783] ioctl32(plymouthd:186): Unknown cmd fd(10) cmd(00005457){t:'T';sz:0} arg(ffb6a5d0) on /dev/tty1
[    2.581803] ioctl32(plymouthd:186): Unknown cmd fd(10) cmd(00005456){t:'T';sz:0} arg(ffb6a680) on /dev/tty1

both ioctl functions work on the 'struct termios' resp. 'struct termios2',
which has the same size (36 bytes resp. 44 bytes) on x86 and x86_64,
so it's just a matter of converting the pointer from userland.

Signed-off-by: Thomas Meyer <thomas@m3y3r.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Thomas Meyer 2011-10-05 23:13:13 +02:00 committed by Greg Kroah-Hartman
parent 361162459f
commit 8193c42906
3 changed files with 21 additions and 0 deletions
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2
drivers/tty/tty_io.c
View File

@ -2717,6 +2717,8 @@ static long tty_compat_ioctl(struct file *file, unsigned int cmd,
ld = tty_ldisc_ref_wait(tty); ld = tty_ldisc_ref_wait(tty);
if (ld->ops->compat_ioctl) if (ld->ops->compat_ioctl)
retval = ld->ops->compat_ioctl(tty, file, cmd, arg); retval = ld->ops->compat_ioctl(tty, file, cmd, arg);
else
retval = n_tty_compat_ioctl_helper(tty, file, cmd, arg);
tty_ldisc_deref(ld); tty_ldisc_deref(ld);
return retval; return retval;

17
drivers/tty/tty_ioctl.c
View File

@ -19,6 +19,7 @@
#include <linux/module.h> #include <linux/module.h>
#include <linux/bitops.h> #include <linux/bitops.h>
#include <linux/mutex.h> #include <linux/mutex.h>
#include <linux/compat.h>
#include <asm/io.h> #include <asm/io.h>
#include <asm/uaccess.h> #include <asm/uaccess.h>
@ -1179,3 +1180,19 @@ int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file,
} }
} }
EXPORT_SYMBOL(n_tty_ioctl_helper); EXPORT_SYMBOL(n_tty_ioctl_helper);
#ifdef CONFIG_COMPAT
long n_tty_compat_ioctl_helper(struct tty_struct *tty, struct file *file,
unsigned int cmd, unsigned long arg)
{
switch (cmd) {
case TIOCGLCKTRMIOS:
case TIOCSLCKTRMIOS:
return tty_mode_ioctl(tty, file, cmd, (unsigned long) compat_ptr(arg));
default:
return -ENOIOCTLCMD;
}
}
EXPORT_SYMBOL(n_tty_compat_ioctl_helper);
#endif

2
include/linux/tty.h
View File

@ -579,6 +579,8 @@ extern int __init tty_init(void);
/* tty_ioctl.c */ /* tty_ioctl.c */
extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file, extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file,
unsigned int cmd, unsigned long arg); unsigned int cmd, unsigned long arg);
extern long n_tty_compat_ioctl_helper(struct tty_struct *tty, struct file *file,
unsigned int cmd, unsigned long arg);
/* serial.c */ /* serial.c */