diff options
Diffstat (limited to 'drivers/char/vt_ioctl.c')
| -rw-r--r-- | drivers/char/vt_ioctl.c | 1201 |
1 files changed, 1201 insertions, 0 deletions
diff --git a/drivers/char/vt_ioctl.c b/drivers/char/vt_ioctl.c new file mode 100644 index 00000000000..5d386f4bea4 --- /dev/null +++ b/drivers/char/vt_ioctl.c @@ -0,0 +1,1201 @@ +/* + * linux/drivers/char/vt_ioctl.c + * + * 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/config.h> +#include <linux/types.h> +#include <linux/errno.h> +#include <linux/sched.h> +#include <linux/tty.h> +#include <linux/timer.h> +#include <linux/kernel.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 <asm/io.h> +#include <asm/uaccess.h> + +#include <linux/kbd_kern.h> +#include <linux/vt_kern.h> +#include <linux/kbd_diacr.h> +#include <linux/selection.h> + +static char vt_dont_switch; +extern struct tty_driver *console_driver; + +#define VT_IS_IN_USE(i) (console_driver->ttys[i] && console_driver->ttys[i]->count) +#define VT_BUSY(i) (VT_IS_IN_USE(i) || i == fg_console || vc_cons[i].d == sel_cons) + +/* + * 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 <linux/syscalls.h> +#endif + +static void complete_change_console(struct vc_data *vc); + +/* + * 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) + +#define i (tmp.kb_index) +#define s (tmp.kb_table) +#define v (tmp.kb_value) +static inline int +do_kdsk_ioctl(int cmd, struct kbentry __user *user_kbe, int perm, struct kbd_struct *kbd) +{ + struct kbentry tmp; + ushort *key_map, val, ov; + + if (copy_from_user(&tmp, user_kbe, sizeof(struct kbentry))) + return -EFAULT; + + switch (cmd) { + case KDGKBENT: + key_map = key_maps[s]; + if (key_map) { + val = U(key_map[i]); + if (kbd->kbdmode != VC_UNICODE && KTYP(val) >= NR_TYPES) + val = K_HOLE; + } else + val = (i ? K_HOLE : K_NOSUCHMAP); + return put_user(val, &user_kbe->kb_value); + case KDSKBENT: + if (!perm) + return -EPERM; + if (!i && v == K_NOSUCHMAP) { + /* disallocate map */ + key_map = key_maps[s]; + if (s && key_map) { + key_maps[s] = NULL; + if (key_map[0] == U(K_ALLOCATED)) { + kfree(key_map); + keymap_count--; + } + } + break; + } + + if (KTYP(v) < NR_TYPES) { + if (KVAL(v) > max_vals[KTYP(v)]) + return -EINVAL; + } else + if (kbd->kbdmode != VC_UNICODE) + return -EINVAL; + + /* ++Geert: non-PC keyboards may generate keycode zero */ +#if !defined(__mc68000__) && !defined(__powerpc__) + /* assignment to entry 0 only tests validity of args */ + if (!i) + break; +#endif + + if (!(key_map = key_maps[s])) { + int j; + + if (keymap_count >= MAX_NR_OF_USER_KEYMAPS && + !capable(CAP_SYS_RESOURCE)) + return -EPERM; + + key_map = (ushort *) kmalloc(sizeof(plain_map), + GFP_KERNEL); + if (!key_map) + return -ENOMEM; + key_maps[s] = key_map; + key_map[0] = U(K_ALLOCATED); + for (j = 1; j < NR_KEYS; j++) + key_map[j] = U(K_HOLE); + keymap_count++; + } + ov = U(key_map[i]); + if (v == ov) + break; /* nothing to do */ + /* + * Attention Key. + */ + if (((ov == K_SAK) || (v == K_SAK)) && !capable(CAP_SYS_ADMIN)) + return -EPERM; + key_map[i] = U(v); + if (!s && (KTYP(ov) == KT_SHIFT || KTYP(v) == KT_SHIFT)) + compute_shiftstate(); + break; + } + return 0; +} +#undef i +#undef s +#undef v + +static inline int +do_kbkeycode_ioctl(int cmd, struct kbkeycode __user *user_kbkc, int perm) +{ + struct kbkeycode tmp; + int kc = 0; + + if (copy_from_user(&tmp, user_kbkc, sizeof(struct kbkeycode))) + return -EFAULT; + switch (cmd) { + case KDGETKEYCODE: + kc = getkeycode(tmp.scancode); + if (kc >= 0) + kc = put_user(kc, &user_kbkc->keycode); + break; + case KDSETKEYCODE: + if (!perm) + return -EPERM; + kc = setkeycode(tmp.scancode, tmp.keycode); + break; + } + return kc; +} + +static inline int +do_kdgkb_ioctl(int cmd, struct kbsentry __user *user_kdgkb, int perm) +{ + struct kbsentry *kbs; + char *p; + u_char *q; + u_char __user *up; + int sz; + int delta; + char *first_free, *fj, *fnw; + int i, j, k; + int ret; + + kbs = kmalloc(sizeof(*kbs), GFP_KERNEL); + if (!kbs) { + ret = -ENOMEM; + goto reterr; + } + + /* we mostly copy too much here (512bytes), but who cares ;) */ + if (copy_from_user(kbs, user_kdgkb, sizeof(struct kbsentry))) { + ret = -EFAULT; + goto reterr; + } + kbs->kb_string[sizeof(kbs->kb_string)-1] = '\0'; + i = kbs->kb_func; + + switch (cmd) { + case KDGKBSENT: + sz = sizeof(kbs->kb_string) - 1; /* sz should have been + a struct member */ + up = user_kdgkb->kb_string; + p = func_table[i]; + if(p) + for ( ; *p && sz; p++, sz--) + if (put_user(*p, up++)) { + ret = -EFAULT; + goto reterr; + } + if (put_user('\0', up)) { + ret = -EFAULT; + goto reterr; + } + kfree(kbs); + return ((p && *p) ? -EOVERFLOW : 0); + case KDSKBSENT: + if (!perm) { + ret = -EPERM; + goto reterr; + } + + q = func_table[i]; + first_free = funcbufptr + (funcbufsize - funcbufleft); + for (j = i+1; j < MAX_NR_FUNC && !func_table[j]; j++) + ; + if (j < MAX_NR_FUNC) + fj = func_table[j]; + else + fj = first_free; + + delta = (q ? -strlen(q) : 1) + strlen(kbs->kb_string); + if (delta <= funcbufleft) { /* it fits in current buf */ + if (j < MAX_NR_FUNC) { + memmove(fj + delta, fj, first_free - fj); + for (k = j; k < MAX_NR_FUNC; k++) + if (func_table[k]) + func_table[k] += delta; + } + if (!q) + func_table[i] = fj; + funcbufleft -= delta; + } else { /* allocate a larger buffer */ + sz = 256; + while (sz < funcbufsize - funcbufleft + delta) + sz <<= 1; + fnw = (char *) kmalloc(sz, GFP_KERNEL); + if(!fnw) { + ret = -ENOMEM; + goto reterr; + } + + if (!q) + func_table[i] = fj; + if (fj > funcbufptr) + memmove(fnw, funcbufptr, fj - funcbufptr); + for (k = 0; k < j; k++) + if (func_table[k]) + func_table[k] = fnw + (func_table[k] - funcbufptr); + + if (first_free > fj) { + memmove(fnw + (fj - funcbufptr) + delta, fj, first_free - fj); + for (k = j; k < MAX_NR_FUNC; k++) + if (func_table[k]) + func_table[k] = fnw + (func_table[k] - funcbufptr) + delta; + } + if (funcbufptr != func_buf) + kfree(funcbufptr); + funcbufptr = fnw; + funcbufleft = funcbufleft - delta + sz - funcbufsize; + funcbufsize = sz; + } + strcpy(func_table[i], kbs->kb_string); + break; + } + ret = 0; +reterr: + kfree(kbs); + return ret; +} + +static inline int +do_fontx_ioctl(int cmd, struct consolefontdesc __user *user_cfd, int perm, 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: + 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 = cfdarg.chardata; + return con_font_op(vc_cons[fg_console].d, 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_cons[fg_console].d, 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 inline int +do_unimap_ioctl(int cmd, struct unimapdesc __user *user_ud, int perm, struct vc_data *vc) +{ + struct unimapdesc tmp; + + if (copy_from_user(&tmp, user_ud, sizeof tmp)) + return -EFAULT; + if (tmp.entries) + if (!access_ok(VERIFY_WRITE, tmp.entries, + tmp.entry_ct*sizeof(struct unipair))) + 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; +} + +/* + * 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, struct file * file, + unsigned int cmd, unsigned long arg) +{ + struct vc_data *vc = (struct vc_data *)tty->driver_data; + struct console_font_op op; /* used in multiple places here */ + struct kbd_struct * kbd; + unsigned int console; + unsigned char ucval; + void __user *up = (void __user *)arg; + int i, perm; + + console = vc->vc_num; + + if (!vc_cons_allocated(console)) /* impossible? */ + return -ENOIOCTLCMD; + + /* + * 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; + + kbd = kbd_table + console; + switch (cmd) { + case KIOCSOUND: + if (!perm) + return -EPERM; + if (arg) + arg = 1193182 / arg; + kd_mksound(arg, 0); + return 0; + + 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 = HZ * ((arg >> 16) & 0xffff) / 1000; + count = ticks ? (arg & 0xffff) : 0; + if (count) + count = 1193182 / count; + kd_mksound(count, ticks); + return 0; + } + + case KDGKBTYPE: + /* + * this is naive. + */ + ucval = KB_101; + goto setchar; + + /* + * 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... + */ + if (arg < GPFIRST || arg > GPLAST) + return -EINVAL; + return sys_ioperm(arg, 1, (cmd == KDADDIO)) ? -ENXIO : 0; + + case KDENABIO: + case KDDISABIO: + return sys_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; + int err; + + if (!capable(CAP_SYS_TTY_CONFIG)) + return -EPERM; + + if (copy_from_user(&kbrep, up, sizeof(struct kbd_repeat))) + return -EFAULT; + err = kbd_rate(&kbrep); + if (err) + return err; + if (copy_to_user(up, &kbrep, sizeof(struct kbd_repeat))) + return -EFAULT; + return 0; + } + + case KDSETMODE: + /* + * 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 + */ + if (!perm) + return -EPERM; + switch (arg) { + case KD_GRAPHICS: + break; + case KD_TEXT0: + case KD_TEXT1: + arg = KD_TEXT; + case KD_TEXT: + break; + default: + return -EINVAL; + } + if (vc->vc_mode == (unsigned char) arg) + return 0; + vc->vc_mode = (unsigned char) arg; + if (console != fg_console) + return 0; + /* + * explicitly blank/unblank the screen if switching modes + */ + acquire_console_sem(); + if (arg == KD_TEXT) + do_unblank_screen(1); + else + do_blank_screen(1); + release_console_sem(); + return 0; + + case KDGETMODE: + ucval = vc->vc_mode; + goto setint; + + 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; + switch(arg) { + case K_RAW: + kbd->kbdmode = VC_RAW; + break; + case K_MEDIUMRAW: + kbd->kbdmode = VC_MEDIUMRAW; + break; + case K_XLATE: + kbd->kbdmode = VC_XLATE; + compute_shiftstate(); + break; + case K_UNICODE: + kbd->kbdmode = VC_UNICODE; + compute_shiftstate(); + break; + default: + return -EINVAL; + } + tty_ldisc_flush(tty); + return 0; + + case KDGKBMODE: + ucval = ((kbd->kbdmode == VC_RAW) ? K_RAW : + (kbd->kbdmode == VC_MEDIUMRAW) ? K_MEDIUMRAW : + (kbd->kbdmode == VC_UNICODE) ? K_UNICODE : + K_XLATE); + goto setint; + + /* this could be folded into KDSKBMODE, but for compatibility + reasons it is not so easy to fold KDGKBMETA into KDGKBMODE */ + case KDSKBMETA: + switch(arg) { + case K_METABIT: + clr_vc_kbd_mode(kbd, VC_META); + break; + case K_ESCPREFIX: + set_vc_kbd_mode(kbd, VC_META); + break; + default: + return -EINVAL; + } + return 0; + + case KDGKBMETA: + ucval = (vc_kbd_mode(kbd, VC_META) ? K_ESCPREFIX : K_METABIT); + setint: + return put_user(ucval, (int __user *)arg); + + case KDGETKEYCODE: + case KDSETKEYCODE: + if(!capable(CAP_SYS_TTY_CONFIG)) + perm=0; + return do_kbkeycode_ioctl(cmd, up, perm); + + case KDGKBENT: + case KDSKBENT: + return do_kdsk_ioctl(cmd, up, perm, kbd); + + case KDGKBSENT: + case KDSKBSENT: + return do_kdgkb_ioctl(cmd, up, perm); + + case KDGKBDIACR: + { + struct kbdiacrs __user *a = up; + + if (put_user(accent_table_size, &a->kb_cnt)) + return -EFAULT; + if (copy_to_user(a->kbdiacr, accent_table, accent_table_size*sizeof(struct kbdiacr))) + return -EFAULT; + return 0; + } + + case KDSKBDIACR: + { + struct kbdiacrs __user *a = up; + unsigned int ct; + + if (!perm) + return -EPERM; + if (get_user(ct,&a->kb_cnt)) + return -EFAULT; + if (ct >= MAX_DIACR) + return -EINVAL; + accent_table_size = ct; + if (copy_from_user(accent_table, a->kbdiacr, ct*sizeof(struct kbdiacr))) + return -EFAULT; + return 0; + } + + /* the ioctls below read/set the flags usually shown in the leds */ + /* don't use them - they will go away without warning */ + case KDGKBLED: + ucval = kbd->ledflagstate | (kbd->default_ledflagstate << 4); + goto setchar; + + case KDSKBLED: + if (!perm) + return -EPERM; + if (arg & ~0x77) + return -EINVAL; + kbd->ledflagstate = (arg & 7); + kbd->default_ledflagstate = ((arg >> 4) & 7); + set_leds(); + return 0; + + /* the ioctls below only set the lights, not the functions */ + /* for those, see KDGKBLED and KDSKBLED above */ + case KDGETLED: + ucval = getledstate(); + setchar: + return put_user(ucval, (char __user *)arg); + + case KDSETLED: + if (!perm) + return -EPERM; + setledstate(kbd, arg); + return 0; + + /* + * 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: + { + extern int spawnpid, spawnsig; + if (!perm || !capable(CAP_KILL)) + return -EPERM; + if (arg < 1 || arg > _NSIG || arg == SIGKILL) + return -EINVAL; + spawnpid = current->pid; + spawnsig = arg; + return 0; + } + + 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; + acquire_console_sem(); + vc->vt_mode = tmp; + /* the frsig is ignored, so we set it to 0 */ + vc->vt_mode.frsig = 0; + vc->vt_pid = current->pid; + /* no switch is required -- saw@shade.msu.ru */ + vc->vt_newvt = -1; + release_console_sem(); + return 0; + } + + case VT_GETMODE: + { + struct vt_mode tmp; + int rc; + + acquire_console_sem(); + memcpy(&tmp, &vc->vt_mode, sizeof(struct vt_mode)); + release_console_sem(); + + rc = copy_to_user(up, &tmp, sizeof(struct vt_mode)); + return rc ? -EFAULT : 0; + } + + /* + * 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 */ + for (i = 0, mask = 2; i < MAX_NR_CONSOLES && mask; ++i, mask <<= 1) + if (VT_IS_IN_USE(i)) + state |= mask; + return put_user(state, &vtstat->v_state); + } + + /* + * Returns the first available (non-opened) console. + */ + case VT_OPENQRY: + for (i = 0; i < MAX_NR_CONSOLES; ++i) + if (! VT_IS_IN_USE(i)) + break; + ucval = i < MAX_NR_CONSOLES ? (i+1) : -1; + goto setint; + + /* + * 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--; + acquire_console_sem(); + i = vc_allocate(arg); + release_console_sem(); + if (i) + return i; + set_console(arg); + return 0; + + /* + * 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-1); + + /* + * 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; + if (vc->vt_mode.mode != VT_PROCESS) + return -EINVAL; + + /* + * Switching-from response + */ + if (vc->vt_newvt >= 0) { + if (arg == 0) + /* + * Switch disallowed, so forget we were trying + * to do it. + */ + vc->vt_newvt = -1; + + else { + /* + * The current vt has been released, so + * complete the switch. + */ + int newvt; + acquire_console_sem(); + newvt = vc->vt_newvt; + vc->vt_newvt = -1; + i = vc_allocate(newvt); + if (i) { + release_console_sem(); + return i; + } + /* + * 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); + release_console_sem(); + } + } + + /* + * Switched-to response + */ + else + { + /* + * If it's just an ACK, ignore it + */ + if (arg != VT_ACKACQ) + return -EINVAL; + } + + return 0; + + /* + * Disallocate memory associated to VT (but leave VT1) + */ + case VT_DISALLOCATE: + if (arg > MAX_NR_CONSOLES) + return -ENXIO; + if (arg == 0) { + /* disallocate all unused consoles, but leave 0 */ + acquire_console_sem(); + for (i=1; i<MAX_NR_CONSOLES; i++) + if (! VT_BUSY(i)) + vc_disallocate(i); + release_console_sem(); + } else { + /* disallocate a single console, if possible */ + arg--; + if (VT_BUSY(arg)) + return -EBUSY; + if (arg) { /* leave 0 */ + acquire_console_sem(); + vc_disallocate(arg); + release_console_sem(); + } + } + return 0; + + case VT_RESIZE: + { + struct vt_sizes __user *vtsizes = up; + ushort ll,cc; + if (!perm) + return -EPERM; + if (get_user(ll, &vtsizes->v_rows) || + get_user(cc, &vtsizes->v_cols)) + return -EFAULT; + for (i = 0; i < MAX_NR_CONSOLES; i++) { + acquire_console_sem(); + vc_resize(vc_cons[i].d, cc, ll); + release_console_sem(); + } + return 0; + } + + case VT_RESIZEX: + { + struct vt_consize __user *vtconsize = up; + ushort ll,cc,vlin,clin,vcol,ccol; + if (!perm) + return -EPERM; + if (!access_ok(VERIFY_READ, vtconsize, + sizeof(struct vt_consize))) + return -EFAULT; + __get_user(ll, &vtconsize->v_rows); + __get_user(cc, &vtconsize->v_cols); + __get_user(vlin, &vtconsize->v_vlin); + __get_user(clin, &vtconsize->v_clin); + __get_user(vcol, &vtconsize->v_vcol); + __get_user(ccol, &vtconsize->v_ccol); + vlin = vlin ? vlin : vc->vc_scan_lines; + if (clin) { + if (ll) { + if (ll != vlin/clin) + return -EINVAL; /* Parameters don't add up */ + } else + ll = vlin/clin; + } + if (vcol && ccol) { + if (cc) { + if (cc != vcol/ccol) + return -EINVAL; + } else + cc = vcol/ccol; + } + + if (clin > 32) + return -EINVAL; + + for (i = 0; i < MAX_NR_CONSOLES; i++) { + if (!vc_cons[i].d) + continue; + acquire_console_sem(); + if (vlin) + vc_cons[i].d->vc_scan_lines = vlin; + if (clin) + vc_cons[i].d->vc_font.height = clin; + vc_resize(vc_cons[i].d, cc, ll); + release_console_sem(); + } + return 0; + } + + 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_cons[fg_console].d, &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_cons[fg_console].d, &op); + } + + case PIO_CMAP: + if (!perm) + return -EPERM; + return con_set_cmap(up); + + case GIO_CMAP: + return con_get_cmap(up); + + case PIO_FONTX: + case GIO_FONTX: + return do_fontx_ioctl(cmd, up, perm, &op); + + case PIO_FONTRESET: + { + if (!perm) + return -EPERM; + +#ifdef BROKEN_GRAPHICS_PROGRAMS + /* With BROKEN_GRAPHICS_PROGRAMS defined, the default + font is not saved. */ + return -ENOSYS; +#else + { + op.op = KD_FONT_OP_SET_DEFAULT; + op.data = NULL; + i = con_font_op(vc_cons[fg_console].d, &op); + if (i) + return i; + con_set_default_unimap(vc_cons[fg_console].d); + return 0; + } +#endif + } + + case KDFONTOP: { + if (copy_from_user(&op, up, sizeof(op))) + return -EFAULT; + if (!perm && op.op != KD_FONT_OP_GET) + return -EPERM; + i = con_font_op(vc, &op); + if (i) return i; + if (copy_to_user(up, &op, sizeof(op))) + return -EFAULT; + return 0; + } + + 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: + { struct unimapinit ui; + if (!perm) + return -EPERM; + i = copy_from_user(&ui, up, sizeof(struct unimapinit)); + if (i) return -EFAULT; + con_clear_unimap(vc, &ui); + return 0; + } + + case PIO_UNIMAP: + case GIO_UNIMAP: + return do_unimap_ioctl(cmd, up, perm, vc); + + case VT_LOCKSWITCH: + if (!capable(CAP_SYS_TTY_CONFIG)) + return -EPERM; + vt_dont_switch = 1; + return 0; + case VT_UNLOCKSWITCH: + if (!capable(CAP_SYS_TTY_CONFIG)) + return -EPERM; + vt_dont_switch = 0; + return 0; + default: + return -ENOIOCTLCMD; + } +} + +/* + * Sometimes we want to wait until a particular VT has been activated. We + * do it in a very simple manner. Everybody waits on a single queue and + * get woken up at once. Those that are satisfied go on with their business, + * while those not ready go back to sleep. Seems overkill to add a wait + * to each vt just for this - usually this does nothing! + */ +static DECLARE_WAIT_QUEUE_HEAD(vt_activate_queue); + +/* + * Sleeps until a vt is activated, or the task is interrupted. Returns + * 0 if activation, -EINTR if interrupted. + */ +int vt_waitactive(int vt) +{ + int retval; + DECLARE_WAITQUEUE(wait, current); + + add_wait_queue(&vt_activate_queue, &wait); + for (;;) { + set_current_state(TASK_INTERRUPTIBLE); + retval = 0; + if (vt == fg_console) + break; + retval = -EINTR; + if (signal_pending(current)) + break; + schedule(); + } + remove_wait_queue(&vt_activate_queue, &wait); + current->state = TASK_RUNNING; + return retval; +} + +#define vt_wake_waitactive() wake_up(&vt_activate_queue) + +void reset_vc(struct vc_data *vc) +{ + vc->vc_mode = KD_TEXT; + kbd_table[vc->vc_num].kbdmode = VC_XLATE; + 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; + vc->vt_pid = -1; + vc->vt_newvt = -1; + if (!in_interrupt()) /* Via keyboard.c:SAK() - akpm */ + reset_palette(vc); +} + +/* + * Performs the back end of a vt switch + */ +static void complete_change_console(struct vc_data *vc) +{ + unsigned char old_vc_mode; + + 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_proc(). 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_proc() will + * tell us if the process has gone or something else + * is awry + */ + if (kill_proc(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_wake_waitactive(); + 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_proc() will + * tell us if the process has gone or something else + * is awry + */ + if (kill_proc(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. + */ + vc->vt_newvt = new_vc->vc_num; + 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); +} |