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1281 lines
29 KiB
1281 lines
29 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (C) 1992 obz under the linux copyright |
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* |
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* Dynamic diacritical handling - [email protected] - Dec 1993 |
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* Dynamic keymap and string allocation - [email protected] - May 1994 |
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* Restrict VT switching via ioctl() - [email protected] - Dec 1995 |
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* Some code moved for less code duplication - Andi Kleen - Mar 1997 |
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* Check put/get_user, cleanups - [email protected] - Jun 2001 |
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*/ |
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|
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#include <linux/types.h> |
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#include <linux/errno.h> |
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#include <linux/sched/signal.h> |
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#include <linux/tty.h> |
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#include <linux/timer.h> |
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#include <linux/kernel.h> |
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#include <linux/compat.h> |
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#include <linux/module.h> |
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#include <linux/kd.h> |
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#include <linux/vt.h> |
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#include <linux/string.h> |
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#include <linux/slab.h> |
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#include <linux/major.h> |
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#include <linux/fs.h> |
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#include <linux/console.h> |
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#include <linux/consolemap.h> |
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#include <linux/signal.h> |
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#include <linux/suspend.h> |
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#include <linux/timex.h> |
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|
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#include <asm/io.h> |
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#include <linux/uaccess.h> |
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|
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#include <linux/nospec.h> |
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|
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#include <linux/kbd_kern.h> |
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#include <linux/vt_kern.h> |
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#include <linux/kbd_diacr.h> |
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#include <linux/selection.h> |
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|
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bool vt_dont_switch; |
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|
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static inline bool vt_in_use(unsigned int i) |
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{ |
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const struct vc_data *vc = vc_cons[i].d; |
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|
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/* |
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* console_lock must be held to prevent the vc from being deallocated |
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* while we're checking whether it's in-use. |
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*/ |
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WARN_CONSOLE_UNLOCKED(); |
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|
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return vc && kref_read(&vc->port.kref) > 1; |
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} |
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|
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static inline bool vt_busy(int i) |
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{ |
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if (vt_in_use(i)) |
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return true; |
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if (i == fg_console) |
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return true; |
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if (vc_is_sel(vc_cons[i].d)) |
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return true; |
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|
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return false; |
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} |
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|
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/* |
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* Console (vt and kd) routines, as defined by USL SVR4 manual, and by |
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* experimentation and study of X386 SYSV handling. |
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* |
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* One point of difference: SYSV vt's are /dev/vtX, which X >= 0, and |
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* /dev/console is a separate ttyp. Under Linux, /dev/tty0 is /dev/console, |
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* and the vc start at /dev/ttyX, X >= 1. We maintain that here, so we will |
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* always treat our set of vt as numbered 1..MAX_NR_CONSOLES (corresponding to |
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* ttys 0..MAX_NR_CONSOLES-1). Explicitly naming VT 0 is illegal, but using |
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* /dev/tty0 (fg_console) as a target is legal, since an implicit aliasing |
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* to the current console is done by the main ioctl code. |
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*/ |
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|
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#ifdef CONFIG_X86 |
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#include <asm/syscalls.h> |
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#endif |
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|
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static void complete_change_console(struct vc_data *vc); |
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|
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/* |
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* User space VT_EVENT handlers |
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*/ |
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|
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struct vt_event_wait { |
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struct list_head list; |
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struct vt_event event; |
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int done; |
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}; |
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|
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static LIST_HEAD(vt_events); |
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static DEFINE_SPINLOCK(vt_event_lock); |
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static DECLARE_WAIT_QUEUE_HEAD(vt_event_waitqueue); |
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|
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/** |
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* vt_event_post |
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* @event: the event that occurred |
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* @old: old console |
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* @new: new console |
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* |
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* Post an VT event to interested VT handlers |
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*/ |
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|
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void vt_event_post(unsigned int event, unsigned int old, unsigned int new) |
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{ |
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struct list_head *pos, *head; |
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unsigned long flags; |
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int wake = 0; |
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|
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spin_lock_irqsave(&vt_event_lock, flags); |
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head = &vt_events; |
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|
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list_for_each(pos, head) { |
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struct vt_event_wait *ve = list_entry(pos, |
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struct vt_event_wait, list); |
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if (!(ve->event.event & event)) |
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continue; |
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ve->event.event = event; |
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/* kernel view is consoles 0..n-1, user space view is |
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console 1..n with 0 meaning current, so we must bias */ |
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ve->event.oldev = old + 1; |
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ve->event.newev = new + 1; |
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wake = 1; |
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ve->done = 1; |
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} |
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spin_unlock_irqrestore(&vt_event_lock, flags); |
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if (wake) |
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wake_up_interruptible(&vt_event_waitqueue); |
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} |
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|
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static void __vt_event_queue(struct vt_event_wait *vw) |
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{ |
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unsigned long flags; |
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/* Prepare the event */ |
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INIT_LIST_HEAD(&vw->list); |
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vw->done = 0; |
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/* Queue our event */ |
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spin_lock_irqsave(&vt_event_lock, flags); |
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list_add(&vw->list, &vt_events); |
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spin_unlock_irqrestore(&vt_event_lock, flags); |
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} |
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|
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static void __vt_event_wait(struct vt_event_wait *vw) |
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{ |
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/* Wait for it to pass */ |
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wait_event_interruptible(vt_event_waitqueue, vw->done); |
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} |
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|
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static void __vt_event_dequeue(struct vt_event_wait *vw) |
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{ |
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unsigned long flags; |
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|
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/* Dequeue it */ |
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spin_lock_irqsave(&vt_event_lock, flags); |
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list_del(&vw->list); |
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spin_unlock_irqrestore(&vt_event_lock, flags); |
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} |
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|
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/** |
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* vt_event_wait - wait for an event |
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* @vw: our event |
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* |
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* Waits for an event to occur which completes our vt_event_wait |
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* structure. On return the structure has wv->done set to 1 for success |
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* or 0 if some event such as a signal ended the wait. |
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*/ |
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|
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static void vt_event_wait(struct vt_event_wait *vw) |
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{ |
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__vt_event_queue(vw); |
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__vt_event_wait(vw); |
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__vt_event_dequeue(vw); |
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} |
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|
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/** |
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* vt_event_wait_ioctl - event ioctl handler |
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* @event: argument to ioctl (the event) |
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* |
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* Implement the VT_WAITEVENT ioctl using the VT event interface |
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*/ |
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|
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static int vt_event_wait_ioctl(struct vt_event __user *event) |
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{ |
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struct vt_event_wait vw; |
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|
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if (copy_from_user(&vw.event, event, sizeof(struct vt_event))) |
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return -EFAULT; |
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/* Highest supported event for now */ |
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if (vw.event.event & ~VT_MAX_EVENT) |
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return -EINVAL; |
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|
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vt_event_wait(&vw); |
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/* If it occurred report it */ |
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if (vw.done) { |
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if (copy_to_user(event, &vw.event, sizeof(struct vt_event))) |
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return -EFAULT; |
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return 0; |
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} |
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return -EINTR; |
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} |
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|
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/** |
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* vt_waitactive - active console wait |
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* @n: new console |
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* |
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* Helper for event waits. Used to implement the legacy |
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* event waiting ioctls in terms of events |
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*/ |
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|
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int vt_waitactive(int n) |
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{ |
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struct vt_event_wait vw; |
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do { |
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vw.event.event = VT_EVENT_SWITCH; |
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__vt_event_queue(&vw); |
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if (n == fg_console + 1) { |
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__vt_event_dequeue(&vw); |
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break; |
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} |
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__vt_event_wait(&vw); |
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__vt_event_dequeue(&vw); |
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if (vw.done == 0) |
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return -EINTR; |
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} while (vw.event.newev != n); |
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return 0; |
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} |
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|
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/* |
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* these are the valid i/o ports we're allowed to change. they map all the |
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* video ports |
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*/ |
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#define GPFIRST 0x3b4 |
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#define GPLAST 0x3df |
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#define GPNUM (GPLAST - GPFIRST + 1) |
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|
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/* |
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* currently, setting the mode from KD_TEXT to KD_GRAPHICS doesn't do a whole |
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* lot. i'm not sure if it should do any restoration of modes or what... |
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* |
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* XXX It should at least call into the driver, fbdev's definitely need to |
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* restore their engine state. --BenH |
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*/ |
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static int vt_kdsetmode(struct vc_data *vc, unsigned long mode) |
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{ |
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switch (mode) { |
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case KD_GRAPHICS: |
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break; |
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case KD_TEXT0: |
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case KD_TEXT1: |
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mode = KD_TEXT; |
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fallthrough; |
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case KD_TEXT: |
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break; |
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default: |
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return -EINVAL; |
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} |
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|
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/* FIXME: this needs the console lock extending */ |
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if (vc->vc_mode == mode) |
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return 0; |
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vc->vc_mode = mode; |
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if (vc->vc_num != fg_console) |
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return 0; |
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/* explicitly blank/unblank the screen if switching modes */ |
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console_lock(); |
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if (mode == KD_TEXT) |
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do_unblank_screen(1); |
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else |
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do_blank_screen(1); |
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console_unlock(); |
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return 0; |
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} |
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static int vt_k_ioctl(struct tty_struct *tty, unsigned int cmd, |
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unsigned long arg, bool perm) |
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{ |
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struct vc_data *vc = tty->driver_data; |
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void __user *up = (void __user *)arg; |
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unsigned int console = vc->vc_num; |
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int ret; |
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switch (cmd) { |
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case KIOCSOUND: |
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if (!perm) |
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return -EPERM; |
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/* |
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* The use of PIT_TICK_RATE is historic, it used to be |
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* the platform-dependent CLOCK_TICK_RATE between 2.6.12 |
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* and 2.6.36, which was a minor but unfortunate ABI |
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* change. kd_mksound is locked by the input layer. |
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*/ |
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if (arg) |
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arg = PIT_TICK_RATE / arg; |
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kd_mksound(arg, 0); |
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break; |
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case KDMKTONE: |
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if (!perm) |
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return -EPERM; |
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{ |
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unsigned int ticks, count; |
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|
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/* |
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* Generate the tone for the appropriate number of ticks. |
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* If the time is zero, turn off sound ourselves. |
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*/ |
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ticks = msecs_to_jiffies((arg >> 16) & 0xffff); |
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count = ticks ? (arg & 0xffff) : 0; |
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if (count) |
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count = PIT_TICK_RATE / count; |
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kd_mksound(count, ticks); |
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break; |
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} |
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case KDGKBTYPE: |
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/* |
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* this is naïve. |
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*/ |
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return put_user(KB_101, (char __user *)arg); |
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|
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/* |
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* These cannot be implemented on any machine that implements |
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* ioperm() in user level (such as Alpha PCs) or not at all. |
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* |
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* XXX: you should never use these, just call ioperm directly.. |
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*/ |
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#ifdef CONFIG_X86 |
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case KDADDIO: |
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case KDDELIO: |
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/* |
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* KDADDIO and KDDELIO may be able to add ports beyond what |
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* we reject here, but to be safe... |
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* |
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* These are locked internally via sys_ioperm |
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*/ |
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if (arg < GPFIRST || arg > GPLAST) |
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return -EINVAL; |
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return ksys_ioperm(arg, 1, (cmd == KDADDIO)) ? -ENXIO : 0; |
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|
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case KDENABIO: |
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case KDDISABIO: |
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return ksys_ioperm(GPFIRST, GPNUM, |
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(cmd == KDENABIO)) ? -ENXIO : 0; |
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#endif |
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|
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/* Linux m68k/i386 interface for setting the keyboard delay/repeat rate */ |
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|
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case KDKBDREP: |
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{ |
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struct kbd_repeat kbrep; |
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|
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if (!capable(CAP_SYS_TTY_CONFIG)) |
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return -EPERM; |
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if (copy_from_user(&kbrep, up, sizeof(struct kbd_repeat))) |
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return -EFAULT; |
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|
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ret = kbd_rate(&kbrep); |
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if (ret) |
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return ret; |
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if (copy_to_user(up, &kbrep, sizeof(struct kbd_repeat))) |
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return -EFAULT; |
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break; |
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} |
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|
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case KDSETMODE: |
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if (!perm) |
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return -EPERM; |
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|
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return vt_kdsetmode(vc, arg); |
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|
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case KDGETMODE: |
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return put_user(vc->vc_mode, (int __user *)arg); |
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|
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case KDMAPDISP: |
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case KDUNMAPDISP: |
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/* |
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* these work like a combination of mmap and KDENABIO. |
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* this could be easily finished. |
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*/ |
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return -EINVAL; |
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|
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case KDSKBMODE: |
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if (!perm) |
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return -EPERM; |
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ret = vt_do_kdskbmode(console, arg); |
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if (ret) |
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return ret; |
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tty_ldisc_flush(tty); |
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break; |
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|
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case KDGKBMODE: |
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return put_user(vt_do_kdgkbmode(console), (int __user *)arg); |
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|
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/* this could be folded into KDSKBMODE, but for compatibility |
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reasons it is not so easy to fold KDGKBMETA into KDGKBMODE */ |
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case KDSKBMETA: |
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return vt_do_kdskbmeta(console, arg); |
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|
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case KDGKBMETA: |
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/* FIXME: should review whether this is worth locking */ |
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return put_user(vt_do_kdgkbmeta(console), (int __user *)arg); |
|
|
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case KDGETKEYCODE: |
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case KDSETKEYCODE: |
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if(!capable(CAP_SYS_TTY_CONFIG)) |
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perm = 0; |
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return vt_do_kbkeycode_ioctl(cmd, up, perm); |
|
|
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case KDGKBENT: |
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case KDSKBENT: |
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return vt_do_kdsk_ioctl(cmd, up, perm, console); |
|
|
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case KDGKBSENT: |
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case KDSKBSENT: |
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return vt_do_kdgkb_ioctl(cmd, up, perm); |
|
|
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/* Diacritical processing. Handled in keyboard.c as it has |
|
to operate on the keyboard locks and structures */ |
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case KDGKBDIACR: |
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case KDGKBDIACRUC: |
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case KDSKBDIACR: |
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case KDSKBDIACRUC: |
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return vt_do_diacrit(cmd, up, perm); |
|
|
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/* the ioctls below read/set the flags usually shown in the leds */ |
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/* don't use them - they will go away without warning */ |
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case KDGKBLED: |
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case KDSKBLED: |
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case KDGETLED: |
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case KDSETLED: |
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return vt_do_kdskled(console, cmd, arg, perm); |
|
|
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/* |
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* A process can indicate its willingness to accept signals |
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* generated by pressing an appropriate key combination. |
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* Thus, one can have a daemon that e.g. spawns a new console |
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* upon a keypress and then changes to it. |
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* See also the kbrequest field of inittab(5). |
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*/ |
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case KDSIGACCEPT: |
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if (!perm || !capable(CAP_KILL)) |
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return -EPERM; |
|
if (!valid_signal(arg) || arg < 1 || arg == SIGKILL) |
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return -EINVAL; |
|
|
|
spin_lock_irq(&vt_spawn_con.lock); |
|
put_pid(vt_spawn_con.pid); |
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vt_spawn_con.pid = get_pid(task_pid(current)); |
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vt_spawn_con.sig = arg; |
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spin_unlock_irq(&vt_spawn_con.lock); |
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break; |
|
|
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case KDFONTOP: { |
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struct console_font_op op; |
|
|
|
if (copy_from_user(&op, up, sizeof(op))) |
|
return -EFAULT; |
|
if (!perm && op.op != KD_FONT_OP_GET) |
|
return -EPERM; |
|
ret = con_font_op(vc, &op); |
|
if (ret) |
|
return ret; |
|
if (copy_to_user(up, &op, sizeof(op))) |
|
return -EFAULT; |
|
break; |
|
} |
|
|
|
default: |
|
return -ENOIOCTLCMD; |
|
} |
|
|
|
return 0; |
|
} |
|
|
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static inline int do_unimap_ioctl(int cmd, struct unimapdesc __user *user_ud, |
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bool perm, struct vc_data *vc) |
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{ |
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struct unimapdesc tmp; |
|
|
|
if (copy_from_user(&tmp, user_ud, sizeof tmp)) |
|
return -EFAULT; |
|
switch (cmd) { |
|
case PIO_UNIMAP: |
|
if (!perm) |
|
return -EPERM; |
|
return con_set_unimap(vc, tmp.entry_ct, tmp.entries); |
|
case GIO_UNIMAP: |
|
if (!perm && fg_console != vc->vc_num) |
|
return -EPERM; |
|
return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), |
|
tmp.entries); |
|
} |
|
return 0; |
|
} |
|
|
|
static int vt_io_ioctl(struct vc_data *vc, unsigned int cmd, void __user *up, |
|
bool perm) |
|
{ |
|
switch (cmd) { |
|
case PIO_CMAP: |
|
if (!perm) |
|
return -EPERM; |
|
return con_set_cmap(up); |
|
|
|
case GIO_CMAP: |
|
return con_get_cmap(up); |
|
|
|
case PIO_SCRNMAP: |
|
if (!perm) |
|
return -EPERM; |
|
return con_set_trans_old(up); |
|
|
|
case GIO_SCRNMAP: |
|
return con_get_trans_old(up); |
|
|
|
case PIO_UNISCRNMAP: |
|
if (!perm) |
|
return -EPERM; |
|
return con_set_trans_new(up); |
|
|
|
case GIO_UNISCRNMAP: |
|
return con_get_trans_new(up); |
|
|
|
case PIO_UNIMAPCLR: |
|
if (!perm) |
|
return -EPERM; |
|
con_clear_unimap(vc); |
|
break; |
|
|
|
case PIO_UNIMAP: |
|
case GIO_UNIMAP: |
|
return do_unimap_ioctl(cmd, up, perm, vc); |
|
|
|
default: |
|
return -ENOIOCTLCMD; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int vt_reldisp(struct vc_data *vc, unsigned int swtch) |
|
{ |
|
int newvt, ret; |
|
|
|
if (vc->vt_mode.mode != VT_PROCESS) |
|
return -EINVAL; |
|
|
|
/* Switched-to response */ |
|
if (vc->vt_newvt < 0) { |
|
/* If it's just an ACK, ignore it */ |
|
return swtch == VT_ACKACQ ? 0 : -EINVAL; |
|
} |
|
|
|
/* Switching-from response */ |
|
if (swtch == 0) { |
|
/* Switch disallowed, so forget we were trying to do it. */ |
|
vc->vt_newvt = -1; |
|
return 0; |
|
} |
|
|
|
/* The current vt has been released, so complete the switch. */ |
|
newvt = vc->vt_newvt; |
|
vc->vt_newvt = -1; |
|
ret = vc_allocate(newvt); |
|
if (ret) |
|
return ret; |
|
|
|
/* |
|
* When we actually do the console switch, make sure we are atomic with |
|
* respect to other console switches.. |
|
*/ |
|
complete_change_console(vc_cons[newvt].d); |
|
|
|
return 0; |
|
} |
|
|
|
static int vt_setactivate(struct vt_setactivate __user *sa) |
|
{ |
|
struct vt_setactivate vsa; |
|
struct vc_data *nvc; |
|
int ret; |
|
|
|
if (copy_from_user(&vsa, sa, sizeof(vsa))) |
|
return -EFAULT; |
|
if (vsa.console == 0 || vsa.console > MAX_NR_CONSOLES) |
|
return -ENXIO; |
|
|
|
vsa.console = array_index_nospec(vsa.console, MAX_NR_CONSOLES + 1); |
|
vsa.console--; |
|
console_lock(); |
|
ret = vc_allocate(vsa.console); |
|
if (ret) { |
|
console_unlock(); |
|
return ret; |
|
} |
|
|
|
/* |
|
* This is safe providing we don't drop the console sem between |
|
* vc_allocate and finishing referencing nvc. |
|
*/ |
|
nvc = vc_cons[vsa.console].d; |
|
nvc->vt_mode = vsa.mode; |
|
nvc->vt_mode.frsig = 0; |
|
put_pid(nvc->vt_pid); |
|
nvc->vt_pid = get_pid(task_pid(current)); |
|
console_unlock(); |
|
|
|
/* Commence switch and lock */ |
|
/* Review set_console locks */ |
|
set_console(vsa.console); |
|
|
|
return 0; |
|
} |
|
|
|
/* deallocate a single console, if possible (leave 0) */ |
|
static int vt_disallocate(unsigned int vc_num) |
|
{ |
|
struct vc_data *vc = NULL; |
|
int ret = 0; |
|
|
|
console_lock(); |
|
if (vt_busy(vc_num)) |
|
ret = -EBUSY; |
|
else if (vc_num) |
|
vc = vc_deallocate(vc_num); |
|
console_unlock(); |
|
|
|
if (vc && vc_num >= MIN_NR_CONSOLES) |
|
tty_port_put(&vc->port); |
|
|
|
return ret; |
|
} |
|
|
|
/* deallocate all unused consoles, but leave 0 */ |
|
static void vt_disallocate_all(void) |
|
{ |
|
struct vc_data *vc[MAX_NR_CONSOLES]; |
|
int i; |
|
|
|
console_lock(); |
|
for (i = 1; i < MAX_NR_CONSOLES; i++) |
|
if (!vt_busy(i)) |
|
vc[i] = vc_deallocate(i); |
|
else |
|
vc[i] = NULL; |
|
console_unlock(); |
|
|
|
for (i = 1; i < MAX_NR_CONSOLES; i++) { |
|
if (vc[i] && i >= MIN_NR_CONSOLES) |
|
tty_port_put(&vc[i]->port); |
|
} |
|
} |
|
|
|
static int vt_resizex(struct vc_data *vc, struct vt_consize __user *cs) |
|
{ |
|
struct vt_consize v; |
|
int i; |
|
|
|
if (copy_from_user(&v, cs, sizeof(struct vt_consize))) |
|
return -EFAULT; |
|
|
|
if (v.v_vlin) |
|
pr_info_once("\"struct vt_consize\"->v_vlin is ignored. Please report if you need this.\n"); |
|
if (v.v_clin) |
|
pr_info_once("\"struct vt_consize\"->v_clin is ignored. Please report if you need this.\n"); |
|
|
|
console_lock(); |
|
for (i = 0; i < MAX_NR_CONSOLES; i++) { |
|
vc = vc_cons[i].d; |
|
|
|
if (vc) { |
|
vc->vc_resize_user = 1; |
|
vc_resize(vc, v.v_cols, v.v_rows); |
|
} |
|
} |
|
console_unlock(); |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* We handle the console-specific ioctl's here. We allow the |
|
* capability to modify any console, not just the fg_console. |
|
*/ |
|
int vt_ioctl(struct tty_struct *tty, |
|
unsigned int cmd, unsigned long arg) |
|
{ |
|
struct vc_data *vc = tty->driver_data; |
|
void __user *up = (void __user *)arg; |
|
int i, perm; |
|
int ret; |
|
|
|
/* |
|
* To have permissions to do most of the vt ioctls, we either have |
|
* to be the owner of the tty, or have CAP_SYS_TTY_CONFIG. |
|
*/ |
|
perm = 0; |
|
if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG)) |
|
perm = 1; |
|
|
|
ret = vt_k_ioctl(tty, cmd, arg, perm); |
|
if (ret != -ENOIOCTLCMD) |
|
return ret; |
|
|
|
ret = vt_io_ioctl(vc, cmd, up, perm); |
|
if (ret != -ENOIOCTLCMD) |
|
return ret; |
|
|
|
switch (cmd) { |
|
case TIOCLINUX: |
|
return tioclinux(tty, arg); |
|
case VT_SETMODE: |
|
{ |
|
struct vt_mode tmp; |
|
|
|
if (!perm) |
|
return -EPERM; |
|
if (copy_from_user(&tmp, up, sizeof(struct vt_mode))) |
|
return -EFAULT; |
|
if (tmp.mode != VT_AUTO && tmp.mode != VT_PROCESS) |
|
return -EINVAL; |
|
|
|
console_lock(); |
|
vc->vt_mode = tmp; |
|
/* the frsig is ignored, so we set it to 0 */ |
|
vc->vt_mode.frsig = 0; |
|
put_pid(vc->vt_pid); |
|
vc->vt_pid = get_pid(task_pid(current)); |
|
/* no switch is required -- [email protected] */ |
|
vc->vt_newvt = -1; |
|
console_unlock(); |
|
break; |
|
} |
|
|
|
case VT_GETMODE: |
|
{ |
|
struct vt_mode tmp; |
|
int rc; |
|
|
|
console_lock(); |
|
memcpy(&tmp, &vc->vt_mode, sizeof(struct vt_mode)); |
|
console_unlock(); |
|
|
|
rc = copy_to_user(up, &tmp, sizeof(struct vt_mode)); |
|
if (rc) |
|
return -EFAULT; |
|
break; |
|
} |
|
|
|
/* |
|
* Returns global vt state. Note that VT 0 is always open, since |
|
* it's an alias for the current VT, and people can't use it here. |
|
* We cannot return state for more than 16 VTs, since v_state is short. |
|
*/ |
|
case VT_GETSTATE: |
|
{ |
|
struct vt_stat __user *vtstat = up; |
|
unsigned short state, mask; |
|
|
|
if (put_user(fg_console + 1, &vtstat->v_active)) |
|
return -EFAULT; |
|
|
|
state = 1; /* /dev/tty0 is always open */ |
|
console_lock(); /* required by vt_in_use() */ |
|
for (i = 0, mask = 2; i < MAX_NR_CONSOLES && mask; |
|
++i, mask <<= 1) |
|
if (vt_in_use(i)) |
|
state |= mask; |
|
console_unlock(); |
|
return put_user(state, &vtstat->v_state); |
|
} |
|
|
|
/* |
|
* Returns the first available (non-opened) console. |
|
*/ |
|
case VT_OPENQRY: |
|
console_lock(); /* required by vt_in_use() */ |
|
for (i = 0; i < MAX_NR_CONSOLES; ++i) |
|
if (!vt_in_use(i)) |
|
break; |
|
console_unlock(); |
|
i = i < MAX_NR_CONSOLES ? (i+1) : -1; |
|
return put_user(i, (int __user *)arg); |
|
|
|
/* |
|
* ioctl(fd, VT_ACTIVATE, num) will cause us to switch to vt # num, |
|
* with num >= 1 (switches to vt 0, our console, are not allowed, just |
|
* to preserve sanity). |
|
*/ |
|
case VT_ACTIVATE: |
|
if (!perm) |
|
return -EPERM; |
|
if (arg == 0 || arg > MAX_NR_CONSOLES) |
|
return -ENXIO; |
|
|
|
arg--; |
|
console_lock(); |
|
ret = vc_allocate(arg); |
|
console_unlock(); |
|
if (ret) |
|
return ret; |
|
set_console(arg); |
|
break; |
|
|
|
case VT_SETACTIVATE: |
|
if (!perm) |
|
return -EPERM; |
|
|
|
return vt_setactivate(up); |
|
|
|
/* |
|
* wait until the specified VT has been activated |
|
*/ |
|
case VT_WAITACTIVE: |
|
if (!perm) |
|
return -EPERM; |
|
if (arg == 0 || arg > MAX_NR_CONSOLES) |
|
return -ENXIO; |
|
return vt_waitactive(arg); |
|
|
|
/* |
|
* If a vt is under process control, the kernel will not switch to it |
|
* immediately, but postpone the operation until the process calls this |
|
* ioctl, allowing the switch to complete. |
|
* |
|
* According to the X sources this is the behavior: |
|
* 0: pending switch-from not OK |
|
* 1: pending switch-from OK |
|
* 2: completed switch-to OK |
|
*/ |
|
case VT_RELDISP: |
|
if (!perm) |
|
return -EPERM; |
|
|
|
console_lock(); |
|
ret = vt_reldisp(vc, arg); |
|
console_unlock(); |
|
|
|
return ret; |
|
|
|
|
|
/* |
|
* Disallocate memory associated to VT (but leave VT1) |
|
*/ |
|
case VT_DISALLOCATE: |
|
if (arg > MAX_NR_CONSOLES) |
|
return -ENXIO; |
|
|
|
if (arg == 0) |
|
vt_disallocate_all(); |
|
else |
|
return vt_disallocate(--arg); |
|
break; |
|
|
|
case VT_RESIZE: |
|
{ |
|
struct vt_sizes __user *vtsizes = up; |
|
struct vc_data *vc; |
|
ushort ll,cc; |
|
|
|
if (!perm) |
|
return -EPERM; |
|
if (get_user(ll, &vtsizes->v_rows) || |
|
get_user(cc, &vtsizes->v_cols)) |
|
return -EFAULT; |
|
|
|
console_lock(); |
|
for (i = 0; i < MAX_NR_CONSOLES; i++) { |
|
vc = vc_cons[i].d; |
|
|
|
if (vc) { |
|
vc->vc_resize_user = 1; |
|
/* FIXME: review v tty lock */ |
|
vc_resize(vc_cons[i].d, cc, ll); |
|
} |
|
} |
|
console_unlock(); |
|
break; |
|
} |
|
|
|
case VT_RESIZEX: |
|
if (!perm) |
|
return -EPERM; |
|
|
|
return vt_resizex(vc, up); |
|
|
|
case VT_LOCKSWITCH: |
|
if (!capable(CAP_SYS_TTY_CONFIG)) |
|
return -EPERM; |
|
vt_dont_switch = true; |
|
break; |
|
case VT_UNLOCKSWITCH: |
|
if (!capable(CAP_SYS_TTY_CONFIG)) |
|
return -EPERM; |
|
vt_dont_switch = false; |
|
break; |
|
case VT_GETHIFONTMASK: |
|
return put_user(vc->vc_hi_font_mask, |
|
(unsigned short __user *)arg); |
|
case VT_WAITEVENT: |
|
return vt_event_wait_ioctl((struct vt_event __user *)arg); |
|
default: |
|
return -ENOIOCTLCMD; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
void reset_vc(struct vc_data *vc) |
|
{ |
|
vc->vc_mode = KD_TEXT; |
|
vt_reset_unicode(vc->vc_num); |
|
vc->vt_mode.mode = VT_AUTO; |
|
vc->vt_mode.waitv = 0; |
|
vc->vt_mode.relsig = 0; |
|
vc->vt_mode.acqsig = 0; |
|
vc->vt_mode.frsig = 0; |
|
put_pid(vc->vt_pid); |
|
vc->vt_pid = NULL; |
|
vc->vt_newvt = -1; |
|
reset_palette(vc); |
|
} |
|
|
|
void vc_SAK(struct work_struct *work) |
|
{ |
|
struct vc *vc_con = |
|
container_of(work, struct vc, SAK_work); |
|
struct vc_data *vc; |
|
struct tty_struct *tty; |
|
|
|
console_lock(); |
|
vc = vc_con->d; |
|
if (vc) { |
|
/* FIXME: review tty ref counting */ |
|
tty = vc->port.tty; |
|
/* |
|
* SAK should also work in all raw modes and reset |
|
* them properly. |
|
*/ |
|
if (tty) |
|
__do_SAK(tty); |
|
reset_vc(vc); |
|
} |
|
console_unlock(); |
|
} |
|
|
|
#ifdef CONFIG_COMPAT |
|
|
|
struct compat_console_font_op { |
|
compat_uint_t op; /* operation code KD_FONT_OP_* */ |
|
compat_uint_t flags; /* KD_FONT_FLAG_* */ |
|
compat_uint_t width, height; /* font size */ |
|
compat_uint_t charcount; |
|
compat_caddr_t data; /* font data with height fixed to 32 */ |
|
}; |
|
|
|
static inline int |
|
compat_kdfontop_ioctl(struct compat_console_font_op __user *fontop, |
|
int perm, struct console_font_op *op, struct vc_data *vc) |
|
{ |
|
int i; |
|
|
|
if (copy_from_user(op, fontop, sizeof(struct compat_console_font_op))) |
|
return -EFAULT; |
|
if (!perm && op->op != KD_FONT_OP_GET) |
|
return -EPERM; |
|
op->data = compat_ptr(((struct compat_console_font_op *)op)->data); |
|
i = con_font_op(vc, op); |
|
if (i) |
|
return i; |
|
((struct compat_console_font_op *)op)->data = (unsigned long)op->data; |
|
if (copy_to_user(fontop, op, sizeof(struct compat_console_font_op))) |
|
return -EFAULT; |
|
return 0; |
|
} |
|
|
|
struct compat_unimapdesc { |
|
unsigned short entry_ct; |
|
compat_caddr_t entries; |
|
}; |
|
|
|
static inline int |
|
compat_unimap_ioctl(unsigned int cmd, struct compat_unimapdesc __user *user_ud, |
|
int perm, struct vc_data *vc) |
|
{ |
|
struct compat_unimapdesc tmp; |
|
struct unipair __user *tmp_entries; |
|
|
|
if (copy_from_user(&tmp, user_ud, sizeof tmp)) |
|
return -EFAULT; |
|
tmp_entries = compat_ptr(tmp.entries); |
|
switch (cmd) { |
|
case PIO_UNIMAP: |
|
if (!perm) |
|
return -EPERM; |
|
return con_set_unimap(vc, tmp.entry_ct, tmp_entries); |
|
case GIO_UNIMAP: |
|
if (!perm && fg_console != vc->vc_num) |
|
return -EPERM; |
|
return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), tmp_entries); |
|
} |
|
return 0; |
|
} |
|
|
|
long vt_compat_ioctl(struct tty_struct *tty, |
|
unsigned int cmd, unsigned long arg) |
|
{ |
|
struct vc_data *vc = tty->driver_data; |
|
struct console_font_op op; /* used in multiple places here */ |
|
void __user *up = compat_ptr(arg); |
|
int perm; |
|
|
|
/* |
|
* To have permissions to do most of the vt ioctls, we either have |
|
* to be the owner of the tty, or have CAP_SYS_TTY_CONFIG. |
|
*/ |
|
perm = 0; |
|
if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG)) |
|
perm = 1; |
|
|
|
switch (cmd) { |
|
/* |
|
* these need special handlers for incompatible data structures |
|
*/ |
|
|
|
case KDFONTOP: |
|
return compat_kdfontop_ioctl(up, perm, &op, vc); |
|
|
|
case PIO_UNIMAP: |
|
case GIO_UNIMAP: |
|
return compat_unimap_ioctl(cmd, up, perm, vc); |
|
|
|
/* |
|
* all these treat 'arg' as an integer |
|
*/ |
|
case KIOCSOUND: |
|
case KDMKTONE: |
|
#ifdef CONFIG_X86 |
|
case KDADDIO: |
|
case KDDELIO: |
|
#endif |
|
case KDSETMODE: |
|
case KDMAPDISP: |
|
case KDUNMAPDISP: |
|
case KDSKBMODE: |
|
case KDSKBMETA: |
|
case KDSKBLED: |
|
case KDSETLED: |
|
case KDSIGACCEPT: |
|
case VT_ACTIVATE: |
|
case VT_WAITACTIVE: |
|
case VT_RELDISP: |
|
case VT_DISALLOCATE: |
|
case VT_RESIZE: |
|
case VT_RESIZEX: |
|
return vt_ioctl(tty, cmd, arg); |
|
|
|
/* |
|
* the rest has a compatible data structure behind arg, |
|
* but we have to convert it to a proper 64 bit pointer. |
|
*/ |
|
default: |
|
return vt_ioctl(tty, cmd, (unsigned long)up); |
|
} |
|
} |
|
|
|
|
|
#endif /* CONFIG_COMPAT */ |
|
|
|
|
|
/* |
|
* Performs the back end of a vt switch. Called under the console |
|
* semaphore. |
|
*/ |
|
static void complete_change_console(struct vc_data *vc) |
|
{ |
|
unsigned char old_vc_mode; |
|
int old = fg_console; |
|
|
|
last_console = fg_console; |
|
|
|
/* |
|
* If we're switching, we could be going from KD_GRAPHICS to |
|
* KD_TEXT mode or vice versa, which means we need to blank or |
|
* unblank the screen later. |
|
*/ |
|
old_vc_mode = vc_cons[fg_console].d->vc_mode; |
|
switch_screen(vc); |
|
|
|
/* |
|
* This can't appear below a successful kill_pid(). If it did, |
|
* then the *blank_screen operation could occur while X, having |
|
* received acqsig, is waking up on another processor. This |
|
* condition can lead to overlapping accesses to the VGA range |
|
* and the framebuffer (causing system lockups). |
|
* |
|
* To account for this we duplicate this code below only if the |
|
* controlling process is gone and we've called reset_vc. |
|
*/ |
|
if (old_vc_mode != vc->vc_mode) { |
|
if (vc->vc_mode == KD_TEXT) |
|
do_unblank_screen(1); |
|
else |
|
do_blank_screen(1); |
|
} |
|
|
|
/* |
|
* If this new console is under process control, send it a signal |
|
* telling it that it has acquired. Also check if it has died and |
|
* clean up (similar to logic employed in change_console()) |
|
*/ |
|
if (vc->vt_mode.mode == VT_PROCESS) { |
|
/* |
|
* Send the signal as privileged - kill_pid() will |
|
* tell us if the process has gone or something else |
|
* is awry |
|
*/ |
|
if (kill_pid(vc->vt_pid, vc->vt_mode.acqsig, 1) != 0) { |
|
/* |
|
* The controlling process has died, so we revert back to |
|
* normal operation. In this case, we'll also change back |
|
* to KD_TEXT mode. I'm not sure if this is strictly correct |
|
* but it saves the agony when the X server dies and the screen |
|
* remains blanked due to KD_GRAPHICS! It would be nice to do |
|
* this outside of VT_PROCESS but there is no single process |
|
* to account for and tracking tty count may be undesirable. |
|
*/ |
|
reset_vc(vc); |
|
|
|
if (old_vc_mode != vc->vc_mode) { |
|
if (vc->vc_mode == KD_TEXT) |
|
do_unblank_screen(1); |
|
else |
|
do_blank_screen(1); |
|
} |
|
} |
|
} |
|
|
|
/* |
|
* Wake anyone waiting for their VT to activate |
|
*/ |
|
vt_event_post(VT_EVENT_SWITCH, old, vc->vc_num); |
|
return; |
|
} |
|
|
|
/* |
|
* Performs the front-end of a vt switch |
|
*/ |
|
void change_console(struct vc_data *new_vc) |
|
{ |
|
struct vc_data *vc; |
|
|
|
if (!new_vc || new_vc->vc_num == fg_console || vt_dont_switch) |
|
return; |
|
|
|
/* |
|
* If this vt is in process mode, then we need to handshake with |
|
* that process before switching. Essentially, we store where that |
|
* vt wants to switch to and wait for it to tell us when it's done |
|
* (via VT_RELDISP ioctl). |
|
* |
|
* We also check to see if the controlling process still exists. |
|
* If it doesn't, we reset this vt to auto mode and continue. |
|
* This is a cheap way to track process control. The worst thing |
|
* that can happen is: we send a signal to a process, it dies, and |
|
* the switch gets "lost" waiting for a response; hopefully, the |
|
* user will try again, we'll detect the process is gone (unless |
|
* the user waits just the right amount of time :-) and revert the |
|
* vt to auto control. |
|
*/ |
|
vc = vc_cons[fg_console].d; |
|
if (vc->vt_mode.mode == VT_PROCESS) { |
|
/* |
|
* Send the signal as privileged - kill_pid() will |
|
* tell us if the process has gone or something else |
|
* is awry. |
|
* |
|
* We need to set vt_newvt *before* sending the signal or we |
|
* have a race. |
|
*/ |
|
vc->vt_newvt = new_vc->vc_num; |
|
if (kill_pid(vc->vt_pid, vc->vt_mode.relsig, 1) == 0) { |
|
/* |
|
* It worked. Mark the vt to switch to and |
|
* return. The process needs to send us a |
|
* VT_RELDISP ioctl to complete the switch. |
|
*/ |
|
return; |
|
} |
|
|
|
/* |
|
* The controlling process has died, so we revert back to |
|
* normal operation. In this case, we'll also change back |
|
* to KD_TEXT mode. I'm not sure if this is strictly correct |
|
* but it saves the agony when the X server dies and the screen |
|
* remains blanked due to KD_GRAPHICS! It would be nice to do |
|
* this outside of VT_PROCESS but there is no single process |
|
* to account for and tracking tty count may be undesirable. |
|
*/ |
|
reset_vc(vc); |
|
|
|
/* |
|
* Fall through to normal (VT_AUTO) handling of the switch... |
|
*/ |
|
} |
|
|
|
/* |
|
* Ignore all switches in KD_GRAPHICS+VT_AUTO mode |
|
*/ |
|
if (vc->vc_mode == KD_GRAPHICS) |
|
return; |
|
|
|
complete_change_console(new_vc); |
|
} |
|
|
|
/* Perform a kernel triggered VT switch for suspend/resume */ |
|
|
|
static int disable_vt_switch; |
|
|
|
int vt_move_to_console(unsigned int vt, int alloc) |
|
{ |
|
int prev; |
|
|
|
console_lock(); |
|
/* Graphics mode - up to X */ |
|
if (disable_vt_switch) { |
|
console_unlock(); |
|
return 0; |
|
} |
|
prev = fg_console; |
|
|
|
if (alloc && vc_allocate(vt)) { |
|
/* we can't have a free VC for now. Too bad, |
|
* we don't want to mess the screen for now. */ |
|
console_unlock(); |
|
return -ENOSPC; |
|
} |
|
|
|
if (set_console(vt)) { |
|
/* |
|
* We're unable to switch to the SUSPEND_CONSOLE. |
|
* Let the calling function know so it can decide |
|
* what to do. |
|
*/ |
|
console_unlock(); |
|
return -EIO; |
|
} |
|
console_unlock(); |
|
if (vt_waitactive(vt + 1)) { |
|
pr_debug("Suspend: Can't switch VCs."); |
|
return -EINTR; |
|
} |
|
return prev; |
|
} |
|
|
|
/* |
|
* Normally during a suspend, we allocate a new console and switch to it. |
|
* When we resume, we switch back to the original console. This switch |
|
* can be slow, so on systems where the framebuffer can handle restoration |
|
* of video registers anyways, there's little point in doing the console |
|
* switch. This function allows you to disable it by passing it '0'. |
|
*/ |
|
void pm_set_vt_switch(int do_switch) |
|
{ |
|
console_lock(); |
|
disable_vt_switch = !do_switch; |
|
console_unlock(); |
|
} |
|
EXPORT_SYMBOL(pm_set_vt_switch);
|
|
|