// 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_fontx_ioctl(struct vc_data *vc, int cmd, <------><------>struct consolefontdesc __user *user_cfd, <------><------>struct console_font_op *op) { <------>struct consolefontdesc cfdarg; <------>int i; <------>if (copy_from_user(&cfdarg, user_cfd, sizeof(struct consolefontdesc))) <------><------>return -EFAULT; <------>switch (cmd) { <------>case PIO_FONTX: <------><------>op->op = KD_FONT_OP_SET; <------><------>op->flags = KD_FONT_FLAG_OLD; <------><------>op->width = 8; <------><------>op->height = cfdarg.charheight; <------><------>op->charcount = cfdarg.charcount; <------><------>op->data = cfdarg.chardata; <------><------>return con_font_op(vc, op); <------>case GIO_FONTX: <------><------>op->op = KD_FONT_OP_GET; <------><------>op->flags = KD_FONT_FLAG_OLD; <------><------>op->width = 8; <------><------>op->height = cfdarg.charheight; <------><------>op->charcount = cfdarg.charcount; <------><------>op->data = cfdarg.chardata; <------><------>i = con_font_op(vc, op); <------><------>if (i) <------><------><------>return i; <------><------>cfdarg.charheight = op->height; <------><------>cfdarg.charcount = op->charcount; <------><------>if (copy_to_user(user_cfd, &cfdarg, sizeof(struct consolefontdesc))) <------><------><------>return -EFAULT; <------><------>return 0; <------>} <------>return -EINVAL; } static int vt_io_fontreset(struct vc_data *vc, struct console_font_op *op) { <------>int ret; <------>if (__is_defined(BROKEN_GRAPHICS_PROGRAMS)) { <------><------>/* <------><------> * With BROKEN_GRAPHICS_PROGRAMS defined, the default font is <------><------> * not saved. <------><------> */ <------><------>return -ENOSYS; <------>} <------>op->op = KD_FONT_OP_SET_DEFAULT; <------>op->data = NULL; <------>ret = con_font_op(vc, op); <------>if (ret) <------><------>return ret; <------>console_lock(); <------>con_set_default_unimap(vc); <------>console_unlock(); <------>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) { <------>struct console_font_op op; /* used in multiple places here */ <------>switch (cmd) { <------>case PIO_FONT: <------><------>if (!perm) <------><------><------>return -EPERM; <------><------>op.op = KD_FONT_OP_SET; <------><------>op.flags = KD_FONT_FLAG_OLD | KD_FONT_FLAG_DONT_RECALC; /* Compatibility */ <------><------>op.width = 8; <------><------>op.height = 0; <------><------>op.charcount = 256; <------><------>op.data = up; <------><------>return con_font_op(vc, &op); <------>case GIO_FONT: <------><------>op.op = KD_FONT_OP_GET; <------><------>op.flags = KD_FONT_FLAG_OLD; <------><------>op.width = 8; <------><------>op.height = 32; <------><------>op.charcount = 256; <------><------>op.data = up; <------><------>return con_font_op(vc, &op); <------>case PIO_CMAP: if (!perm) <------><------><------>return -EPERM; <------><------>return con_set_cmap(up); <------>case GIO_CMAP: return con_get_cmap(up); <------>case PIO_FONTX: <------><------>if (!perm) <------><------><------>return -EPERM; <------><------>fallthrough; <------>case GIO_FONTX: <------><------>return do_fontx_ioctl(vc, cmd, up, &op); <------>case PIO_FONTRESET: <------><------>if (!perm) <------><------><------>return -EPERM; <------><------>return vt_io_fontreset(vc, &op); <------>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(); <------><------>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; <------>if (!in_interrupt()) /* Via keyboard.c:SAK() - akpm */ <------><------>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_consolefontdesc { <------>unsigned short charcount; /* characters in font (256 or 512) */ <------>unsigned short charheight; /* scan lines per character (1-32) */ <------>compat_caddr_t chardata; /* font data in expanded form */ }; static inline int compat_fontx_ioctl(struct vc_data *vc, int cmd, <------><------> struct compat_consolefontdesc __user *user_cfd, <------><------> int perm, struct console_font_op *op) { <------>struct compat_consolefontdesc cfdarg; <------>int i; <------>if (copy_from_user(&cfdarg, user_cfd, sizeof(struct compat_consolefontdesc))) <------><------>return -EFAULT; <------>switch (cmd) { <------>case PIO_FONTX: <------><------>if (!perm) <------><------><------>return -EPERM; <------><------>op->op = KD_FONT_OP_SET; <------><------>op->flags = KD_FONT_FLAG_OLD; <------><------>op->width = 8; <------><------>op->height = cfdarg.charheight; <------><------>op->charcount = cfdarg.charcount; <------><------>op->data = compat_ptr(cfdarg.chardata); <------><------>return con_font_op(vc, op); <------>case GIO_FONTX: <------><------>op->op = KD_FONT_OP_GET; <------><------>op->flags = KD_FONT_FLAG_OLD; <------><------>op->width = 8; <------><------>op->height = cfdarg.charheight; <------><------>op->charcount = cfdarg.charcount; <------><------>op->data = compat_ptr(cfdarg.chardata); <------><------>i = con_font_op(vc, op); <------><------>if (i) <------><------><------>return i; <------><------>cfdarg.charheight = op->height; <------><------>cfdarg.charcount = op->charcount; <------><------>if (copy_to_user(user_cfd, &cfdarg, sizeof(struct compat_consolefontdesc))) <------><------><------>return -EFAULT; <------><------>return 0; <------>} <------>return -EINVAL; } 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 PIO_FONTX: <------>case GIO_FONTX: <------><------>return compat_fontx_ioctl(vc, cmd, up, perm, &op); <------>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);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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