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![Xiaomeng Tong](/assets/img/avatar_default.png)
In VT_ACTIVATE an almost identical code path has been patched with array_index_nospec. In the VT_DISALLOCATE path, the arg is the user input from a system call argument and lately used as a index for vc_cons[index].d access, which can be reached through path like vt_disallocate->vc_busy or vt_disallocate->vc_deallocate. For consistency both code paths should have the same mitigations applied. Also, the code style is adjusted as suggested by Jiri. Reviewed-by: Jiri Slaby <jirislaby@kernel.org> Signed-off-by: Xiaomeng Tong <xiam0nd.tong@gmail.com> Link: https://lore.kernel.org/r/20220314122921.31223-1-xiam0nd.tong@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1323 lines
30 KiB
C
1323 lines
30 KiB
C
// 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 - aeb@cwi.nl - Dec 1993
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* Dynamic keymap and string allocation - aeb@cwi.nl - May 1994
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* Restrict VT switching via ioctl() - grif@cs.ucr.edu - 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 - acme@conectiva.com.br - Jun 2001
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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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#include <asm/io.h>
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#include <linux/uaccess.h>
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#include <linux/nospec.h>
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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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bool vt_dont_switch;
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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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* 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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return vc && kref_read(&vc->port.kref) > 1;
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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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return false;
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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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#ifdef CONFIG_X86
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#include <asm/syscalls.h>
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#endif
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static void complete_change_console(struct vc_data *vc);
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/*
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* User space VT_EVENT handlers
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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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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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* 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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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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spin_lock_irqsave(&vt_event_lock, flags);
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head = &vt_events;
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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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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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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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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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/* 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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* 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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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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* 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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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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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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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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* 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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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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* 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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* 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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* Called with the console lock held.
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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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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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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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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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* 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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* 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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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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/* Linux m68k/i386 interface for setting the keyboard delay/repeat rate */
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case KDKBDREP:
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{
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struct kbd_repeat kbrep;
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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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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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case KDSETMODE:
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if (!perm)
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return -EPERM;
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console_lock();
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ret = vt_kdsetmode(vc, arg);
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console_unlock();
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return ret;
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case KDGETMODE:
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return put_user(vc->vc_mode, (int __user *)arg);
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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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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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case KDGKBMODE:
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return put_user(vt_do_kdgkbmode(console), (int __user *)arg);
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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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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
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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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/*
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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;
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if (!valid_signal(arg) || arg < 1 || arg == SIGKILL)
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return -EINVAL;
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|
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spin_lock_irq(&vt_spawn_con.lock);
|
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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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|
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case KDFONTOP: {
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struct console_font_op op;
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|
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if (copy_from_user(&op, up, sizeof(op)))
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return -EFAULT;
|
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if (!perm && op.op != KD_FONT_OP_GET)
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return -EPERM;
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ret = con_font_op(vc, &op);
|
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if (ret)
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return ret;
|
|
if (copy_to_user(up, &op, sizeof(op)))
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return -EFAULT;
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|
break;
|
|
}
|
|
|
|
default:
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return -ENOIOCTLCMD;
|
|
}
|
|
|
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return 0;
|
|
}
|
|
|
|
static inline int do_unimap_ioctl(int cmd, struct unimapdesc __user *user_ud,
|
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bool perm, struct vc_data *vc)
|
|
{
|
|
struct unimapdesc tmp;
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|
|
if (copy_from_user(&tmp, user_ud, sizeof tmp))
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return -EFAULT;
|
|
switch (cmd) {
|
|
case PIO_UNIMAP:
|
|
if (!perm)
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return -EPERM;
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return con_set_unimap(vc, tmp.entry_ct, tmp.entries);
|
|
case GIO_UNIMAP:
|
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if (!perm && fg_console != vc->vc_num)
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return -EPERM;
|
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return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct),
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tmp.entries);
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}
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return 0;
|
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}
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|
|
|
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);
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|
|
|
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--;
|
|
vsa.console = array_index_nospec(vsa.console, MAX_NR_CONSOLES);
|
|
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;
|
|
|
|
/* FIXME: Should check the copies properly */
|
|
if (!v.v_vlin)
|
|
v.v_vlin = vc->vc_scan_lines;
|
|
|
|
if (v.v_clin) {
|
|
int rows = v.v_vlin / v.v_clin;
|
|
if (v.v_rows != rows) {
|
|
if (v.v_rows) /* Parameters don't add up */
|
|
return -EINVAL;
|
|
v.v_rows = rows;
|
|
}
|
|
}
|
|
|
|
if (v.v_vcol && v.v_ccol) {
|
|
int cols = v.v_vcol / v.v_ccol;
|
|
if (v.v_cols != cols) {
|
|
if (v.v_cols)
|
|
return -EINVAL;
|
|
v.v_cols = cols;
|
|
}
|
|
}
|
|
|
|
if (v.v_clin > 32)
|
|
return -EINVAL;
|
|
|
|
for (i = 0; i < MAX_NR_CONSOLES; i++) {
|
|
struct vc_data *vcp;
|
|
|
|
if (!vc_cons[i].d)
|
|
continue;
|
|
console_lock();
|
|
vcp = vc_cons[i].d;
|
|
if (vcp) {
|
|
int ret;
|
|
int save_scan_lines = vcp->vc_scan_lines;
|
|
int save_cell_height = vcp->vc_cell_height;
|
|
|
|
if (v.v_vlin)
|
|
vcp->vc_scan_lines = v.v_vlin;
|
|
if (v.v_clin)
|
|
vcp->vc_cell_height = v.v_clin;
|
|
vcp->vc_resize_user = 1;
|
|
ret = vc_resize(vcp, v.v_cols, v.v_rows);
|
|
if (ret) {
|
|
vcp->vc_scan_lines = save_scan_lines;
|
|
vcp->vc_cell_height = save_cell_height;
|
|
console_unlock();
|
|
return ret;
|
|
}
|
|
}
|
|
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 -- saw@shade.msu.ru */
|
|
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--;
|
|
arg = array_index_nospec(arg, MAX_NR_CONSOLES);
|
|
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();
|
|
break;
|
|
}
|
|
|
|
arg = array_index_nospec(arg - 1, MAX_NR_CONSOLES);
|
|
return vt_disallocate(arg);
|
|
|
|
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);
|