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-rw-r--r--drivers/tty/vt/vt_ioctl.c1323
1 files changed, 1323 insertions, 0 deletions
diff --git a/drivers/tty/vt/vt_ioctl.c b/drivers/tty/vt/vt_ioctl.c
new file mode 100644
index 000000000..8c685b501
--- /dev/null
+++ b/drivers/tty/vt/vt_ioctl.c
@@ -0,0 +1,1323 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 1992 obz under the linux copyright
+ *
+ * Dynamic diacritical handling - aeb@cwi.nl - Dec 1993
+ * Dynamic keymap and string allocation - aeb@cwi.nl - May 1994
+ * Restrict VT switching via ioctl() - grif@cs.ucr.edu - Dec 1995
+ * Some code moved for less code duplication - Andi Kleen - Mar 1997
+ * Check put/get_user, cleanups - acme@conectiva.com.br - Jun 2001
+ */
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/sched/signal.h>
+#include <linux/tty.h>
+#include <linux/timer.h>
+#include <linux/kernel.h>
+#include <linux/compat.h>
+#include <linux/module.h>
+#include <linux/kd.h>
+#include <linux/vt.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/major.h>
+#include <linux/fs.h>
+#include <linux/console.h>
+#include <linux/consolemap.h>
+#include <linux/signal.h>
+#include <linux/suspend.h>
+#include <linux/timex.h>
+
+#include <asm/io.h>
+#include <linux/uaccess.h>
+
+#include <linux/nospec.h>
+
+#include <linux/kbd_kern.h>
+#include <linux/vt_kern.h>
+#include <linux/kbd_diacr.h>
+#include <linux/selection.h>
+
+bool vt_dont_switch;
+
+static inline bool vt_in_use(unsigned int i)
+{
+ const struct vc_data *vc = vc_cons[i].d;
+
+ /*
+ * console_lock must be held to prevent the vc from being deallocated
+ * while we're checking whether it's in-use.
+ */
+ WARN_CONSOLE_UNLOCKED();
+
+ return vc && kref_read(&vc->port.kref) > 1;
+}
+
+static inline bool vt_busy(int i)
+{
+ if (vt_in_use(i))
+ return true;
+ if (i == fg_console)
+ return true;
+ if (vc_is_sel(vc_cons[i].d))
+ return true;
+
+ return false;
+}
+
+/*
+ * Console (vt and kd) routines, as defined by USL SVR4 manual, and by
+ * experimentation and study of X386 SYSV handling.
+ *
+ * One point of difference: SYSV vt's are /dev/vtX, which X >= 0, and
+ * /dev/console is a separate ttyp. Under Linux, /dev/tty0 is /dev/console,
+ * and the vc start at /dev/ttyX, X >= 1. We maintain that here, so we will
+ * always treat our set of vt as numbered 1..MAX_NR_CONSOLES (corresponding to
+ * ttys 0..MAX_NR_CONSOLES-1). Explicitly naming VT 0 is illegal, but using
+ * /dev/tty0 (fg_console) as a target is legal, since an implicit aliasing
+ * to the current console is done by the main ioctl code.
+ */
+
+#ifdef CONFIG_X86
+#include <asm/syscalls.h>
+#endif
+
+static void complete_change_console(struct vc_data *vc);
+
+/*
+ * User space VT_EVENT handlers
+ */
+
+struct vt_event_wait {
+ struct list_head list;
+ struct vt_event event;
+ int done;
+};
+
+static LIST_HEAD(vt_events);
+static DEFINE_SPINLOCK(vt_event_lock);
+static DECLARE_WAIT_QUEUE_HEAD(vt_event_waitqueue);
+
+/**
+ * vt_event_post
+ * @event: the event that occurred
+ * @old: old console
+ * @new: new console
+ *
+ * Post an VT event to interested VT handlers
+ */
+
+void vt_event_post(unsigned int event, unsigned int old, unsigned int new)
+{
+ struct list_head *pos, *head;
+ unsigned long flags;
+ int wake = 0;
+
+ spin_lock_irqsave(&vt_event_lock, flags);
+ head = &vt_events;
+
+ list_for_each(pos, head) {
+ struct vt_event_wait *ve = list_entry(pos,
+ struct vt_event_wait, list);
+ if (!(ve->event.event & event))
+ continue;
+ ve->event.event = event;
+ /* kernel view is consoles 0..n-1, user space view is
+ console 1..n with 0 meaning current, so we must bias */
+ ve->event.oldev = old + 1;
+ ve->event.newev = new + 1;
+ wake = 1;
+ ve->done = 1;
+ }
+ spin_unlock_irqrestore(&vt_event_lock, flags);
+ if (wake)
+ wake_up_interruptible(&vt_event_waitqueue);
+}
+
+static void __vt_event_queue(struct vt_event_wait *vw)
+{
+ unsigned long flags;
+ /* Prepare the event */
+ INIT_LIST_HEAD(&vw->list);
+ vw->done = 0;
+ /* Queue our event */
+ spin_lock_irqsave(&vt_event_lock, flags);
+ list_add(&vw->list, &vt_events);
+ spin_unlock_irqrestore(&vt_event_lock, flags);
+}
+
+static void __vt_event_wait(struct vt_event_wait *vw)
+{
+ /* Wait for it to pass */
+ wait_event_interruptible(vt_event_waitqueue, vw->done);
+}
+
+static void __vt_event_dequeue(struct vt_event_wait *vw)
+{
+ unsigned long flags;
+
+ /* Dequeue it */
+ spin_lock_irqsave(&vt_event_lock, flags);
+ list_del(&vw->list);
+ spin_unlock_irqrestore(&vt_event_lock, flags);
+}
+
+/**
+ * vt_event_wait - wait for an event
+ * @vw: our event
+ *
+ * Waits for an event to occur which completes our vt_event_wait
+ * structure. On return the structure has wv->done set to 1 for success
+ * or 0 if some event such as a signal ended the wait.
+ */
+
+static void vt_event_wait(struct vt_event_wait *vw)
+{
+ __vt_event_queue(vw);
+ __vt_event_wait(vw);
+ __vt_event_dequeue(vw);
+}
+
+/**
+ * vt_event_wait_ioctl - event ioctl handler
+ * @event: argument to ioctl (the event)
+ *
+ * Implement the VT_WAITEVENT ioctl using the VT event interface
+ */
+
+static int vt_event_wait_ioctl(struct vt_event __user *event)
+{
+ struct vt_event_wait vw;
+
+ if (copy_from_user(&vw.event, event, sizeof(struct vt_event)))
+ return -EFAULT;
+ /* Highest supported event for now */
+ if (vw.event.event & ~VT_MAX_EVENT)
+ return -EINVAL;
+
+ vt_event_wait(&vw);
+ /* If it occurred report it */
+ if (vw.done) {
+ if (copy_to_user(event, &vw.event, sizeof(struct vt_event)))
+ return -EFAULT;
+ return 0;
+ }
+ return -EINTR;
+}
+
+/**
+ * vt_waitactive - active console wait
+ * @n: new console
+ *
+ * Helper for event waits. Used to implement the legacy
+ * event waiting ioctls in terms of events
+ */
+
+int vt_waitactive(int n)
+{
+ struct vt_event_wait vw;
+ do {
+ vw.event.event = VT_EVENT_SWITCH;
+ __vt_event_queue(&vw);
+ if (n == fg_console + 1) {
+ __vt_event_dequeue(&vw);
+ break;
+ }
+ __vt_event_wait(&vw);
+ __vt_event_dequeue(&vw);
+ if (vw.done == 0)
+ return -EINTR;
+ } while (vw.event.newev != n);
+ return 0;
+}
+
+/*
+ * these are the valid i/o ports we're allowed to change. they map all the
+ * video ports
+ */
+#define GPFIRST 0x3b4
+#define GPLAST 0x3df
+#define GPNUM (GPLAST - GPFIRST + 1)
+
+/*
+ * currently, setting the mode from KD_TEXT to KD_GRAPHICS doesn't do a whole
+ * lot. i'm not sure if it should do any restoration of modes or what...
+ *
+ * XXX It should at least call into the driver, fbdev's definitely need to
+ * restore their engine state. --BenH
+ *
+ * Called with the console lock held.
+ */
+static int vt_kdsetmode(struct vc_data *vc, unsigned long mode)
+{
+ switch (mode) {
+ case KD_GRAPHICS:
+ break;
+ case KD_TEXT0:
+ case KD_TEXT1:
+ mode = KD_TEXT;
+ fallthrough;
+ case KD_TEXT:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (vc->vc_mode == mode)
+ return 0;
+
+ vc->vc_mode = mode;
+ if (vc->vc_num != fg_console)
+ return 0;
+
+ /* explicitly blank/unblank the screen if switching modes */
+ if (mode == KD_TEXT)
+ do_unblank_screen(1);
+ else
+ do_blank_screen(1);
+
+ return 0;
+}
+
+static int vt_k_ioctl(struct tty_struct *tty, unsigned int cmd,
+ unsigned long arg, bool perm)
+{
+ struct vc_data *vc = tty->driver_data;
+ void __user *up = (void __user *)arg;
+ unsigned int console = vc->vc_num;
+ int ret;
+
+ switch (cmd) {
+ case KIOCSOUND:
+ if (!perm)
+ return -EPERM;
+ /*
+ * The use of PIT_TICK_RATE is historic, it used to be
+ * the platform-dependent CLOCK_TICK_RATE between 2.6.12
+ * and 2.6.36, which was a minor but unfortunate ABI
+ * change. kd_mksound is locked by the input layer.
+ */
+ if (arg)
+ arg = PIT_TICK_RATE / arg;
+ kd_mksound(arg, 0);
+ break;
+
+ case KDMKTONE:
+ if (!perm)
+ return -EPERM;
+ {
+ unsigned int ticks, count;
+
+ /*
+ * Generate the tone for the appropriate number of ticks.
+ * If the time is zero, turn off sound ourselves.
+ */
+ ticks = msecs_to_jiffies((arg >> 16) & 0xffff);
+ count = ticks ? (arg & 0xffff) : 0;
+ if (count)
+ count = PIT_TICK_RATE / count;
+ kd_mksound(count, ticks);
+ break;
+ }
+
+ case KDGKBTYPE:
+ /*
+ * this is naïve.
+ */
+ return put_user(KB_101, (char __user *)arg);
+
+ /*
+ * These cannot be implemented on any machine that implements
+ * ioperm() in user level (such as Alpha PCs) or not at all.
+ *
+ * XXX: you should never use these, just call ioperm directly..
+ */
+#ifdef CONFIG_X86
+ case KDADDIO:
+ case KDDELIO:
+ /*
+ * KDADDIO and KDDELIO may be able to add ports beyond what
+ * we reject here, but to be safe...
+ *
+ * These are locked internally via sys_ioperm
+ */
+ if (arg < GPFIRST || arg > GPLAST)
+ return -EINVAL;
+
+ return ksys_ioperm(arg, 1, (cmd == KDADDIO)) ? -ENXIO : 0;
+
+ case KDENABIO:
+ case KDDISABIO:
+ return ksys_ioperm(GPFIRST, GPNUM,
+ (cmd == KDENABIO)) ? -ENXIO : 0;
+#endif
+
+ /* Linux m68k/i386 interface for setting the keyboard delay/repeat rate */
+
+ case KDKBDREP:
+ {
+ struct kbd_repeat kbrep;
+
+ if (!capable(CAP_SYS_TTY_CONFIG))
+ return -EPERM;
+
+ if (copy_from_user(&kbrep, up, sizeof(struct kbd_repeat)))
+ return -EFAULT;
+
+ ret = kbd_rate(&kbrep);
+ if (ret)
+ return ret;
+ if (copy_to_user(up, &kbrep, sizeof(struct kbd_repeat)))
+ return -EFAULT;
+ break;
+ }
+
+ case KDSETMODE:
+ if (!perm)
+ return -EPERM;
+
+ console_lock();
+ ret = vt_kdsetmode(vc, arg);
+ console_unlock();
+ return ret;
+
+ case KDGETMODE:
+ return put_user(vc->vc_mode, (int __user *)arg);
+
+ case KDMAPDISP:
+ case KDUNMAPDISP:
+ /*
+ * these work like a combination of mmap and KDENABIO.
+ * this could be easily finished.
+ */
+ return -EINVAL;
+
+ case KDSKBMODE:
+ if (!perm)
+ return -EPERM;
+ ret = vt_do_kdskbmode(console, arg);
+ if (ret)
+ return ret;
+ tty_ldisc_flush(tty);
+ break;
+
+ case KDGKBMODE:
+ return put_user(vt_do_kdgkbmode(console), (int __user *)arg);
+
+ /* this could be folded into KDSKBMODE, but for compatibility
+ reasons it is not so easy to fold KDGKBMETA into KDGKBMODE */
+ case KDSKBMETA:
+ return vt_do_kdskbmeta(console, arg);
+
+ case KDGKBMETA:
+ /* FIXME: should review whether this is worth locking */
+ return put_user(vt_do_kdgkbmeta(console), (int __user *)arg);
+
+ case KDGETKEYCODE:
+ case KDSETKEYCODE:
+ if(!capable(CAP_SYS_TTY_CONFIG))
+ perm = 0;
+ return vt_do_kbkeycode_ioctl(cmd, up, perm);
+
+ case KDGKBENT:
+ case KDSKBENT:
+ return vt_do_kdsk_ioctl(cmd, up, perm, console);
+
+ case KDGKBSENT:
+ case KDSKBSENT:
+ return vt_do_kdgkb_ioctl(cmd, up, perm);
+
+ /* Diacritical processing. Handled in keyboard.c as it has
+ to operate on the keyboard locks and structures */
+ case KDGKBDIACR:
+ case KDGKBDIACRUC:
+ case KDSKBDIACR:
+ case KDSKBDIACRUC:
+ return vt_do_diacrit(cmd, up, perm);
+
+ /* the ioctls below read/set the flags usually shown in the leds */
+ /* don't use them - they will go away without warning */
+ case KDGKBLED:
+ case KDSKBLED:
+ case KDGETLED:
+ case KDSETLED:
+ return vt_do_kdskled(console, cmd, arg, perm);
+
+ /*
+ * A process can indicate its willingness to accept signals
+ * generated by pressing an appropriate key combination.
+ * Thus, one can have a daemon that e.g. spawns a new console
+ * upon a keypress and then changes to it.
+ * See also the kbrequest field of inittab(5).
+ */
+ case KDSIGACCEPT:
+ if (!perm || !capable(CAP_KILL))
+ return -EPERM;
+ if (!valid_signal(arg) || arg < 1 || arg == SIGKILL)
+ return -EINVAL;
+
+ spin_lock_irq(&vt_spawn_con.lock);
+ put_pid(vt_spawn_con.pid);
+ vt_spawn_con.pid = get_pid(task_pid(current));
+ vt_spawn_con.sig = arg;
+ spin_unlock_irq(&vt_spawn_con.lock);
+ break;
+
+ case KDFONTOP: {
+ 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;
+}
+
+static inline int do_unimap_ioctl(int cmd, struct unimapdesc __user *user_ud,
+ bool perm, struct vc_data *vc)
+{
+ 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--;
+ 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);