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8cb81811e9
strnlen_user() returns the length of the string including terminating 0. So avoid counting it again and unnecessarily reducing maximum string size by 1. Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
563 lines
12 KiB
C
563 lines
12 KiB
C
/*
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* ebcdic keycode functions for s390 console drivers
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*
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* S390 version
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* Copyright IBM Corp. 2003
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* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
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*/
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/sysrq.h>
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#include <linux/consolemap.h>
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#include <linux/kbd_kern.h>
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#include <linux/kbd_diacr.h>
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#include <asm/uaccess.h>
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#include "keyboard.h"
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/*
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* Handler Tables.
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*/
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#define K_HANDLERS\
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k_self, k_fn, k_spec, k_ignore,\
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k_dead, k_ignore, k_ignore, k_ignore,\
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k_ignore, k_ignore, k_ignore, k_ignore,\
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k_ignore, k_ignore, k_ignore, k_ignore
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typedef void (k_handler_fn)(struct kbd_data *, unsigned char);
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static k_handler_fn K_HANDLERS;
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static k_handler_fn *k_handler[16] = { K_HANDLERS };
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/* maximum values each key_handler can handle */
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static const int kbd_max_vals[] = {
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255, ARRAY_SIZE(func_table) - 1, NR_FN_HANDLER - 1, 0,
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NR_DEAD - 1, 0, 0, 0, 0, 0, 0, 0, 0, 0
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};
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static const int KBD_NR_TYPES = ARRAY_SIZE(kbd_max_vals);
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static unsigned char ret_diacr[NR_DEAD] = {
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'`', '\'', '^', '~', '"', ','
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};
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/*
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* Alloc/free of kbd_data structures.
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*/
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struct kbd_data *
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kbd_alloc(void) {
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struct kbd_data *kbd;
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int i;
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kbd = kzalloc(sizeof(struct kbd_data), GFP_KERNEL);
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if (!kbd)
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goto out;
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kbd->key_maps = kzalloc(sizeof(key_maps), GFP_KERNEL);
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if (!kbd->key_maps)
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goto out_kbd;
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for (i = 0; i < ARRAY_SIZE(key_maps); i++) {
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if (key_maps[i]) {
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kbd->key_maps[i] = kmemdup(key_maps[i],
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sizeof(u_short) * NR_KEYS,
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GFP_KERNEL);
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if (!kbd->key_maps[i])
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goto out_maps;
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}
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}
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kbd->func_table = kzalloc(sizeof(func_table), GFP_KERNEL);
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if (!kbd->func_table)
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goto out_maps;
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for (i = 0; i < ARRAY_SIZE(func_table); i++) {
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if (func_table[i]) {
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kbd->func_table[i] = kstrdup(func_table[i],
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GFP_KERNEL);
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if (!kbd->func_table[i])
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goto out_func;
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}
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}
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kbd->fn_handler =
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kzalloc(sizeof(fn_handler_fn *) * NR_FN_HANDLER, GFP_KERNEL);
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if (!kbd->fn_handler)
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goto out_func;
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kbd->accent_table = kmemdup(accent_table,
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sizeof(struct kbdiacruc) * MAX_DIACR,
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GFP_KERNEL);
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if (!kbd->accent_table)
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goto out_fn_handler;
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kbd->accent_table_size = accent_table_size;
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return kbd;
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out_fn_handler:
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kfree(kbd->fn_handler);
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out_func:
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for (i = 0; i < ARRAY_SIZE(func_table); i++)
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kfree(kbd->func_table[i]);
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kfree(kbd->func_table);
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out_maps:
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for (i = 0; i < ARRAY_SIZE(key_maps); i++)
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kfree(kbd->key_maps[i]);
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kfree(kbd->key_maps);
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out_kbd:
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kfree(kbd);
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out:
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return NULL;
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}
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void
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kbd_free(struct kbd_data *kbd)
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{
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int i;
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kfree(kbd->accent_table);
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kfree(kbd->fn_handler);
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for (i = 0; i < ARRAY_SIZE(func_table); i++)
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kfree(kbd->func_table[i]);
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kfree(kbd->func_table);
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for (i = 0; i < ARRAY_SIZE(key_maps); i++)
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kfree(kbd->key_maps[i]);
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kfree(kbd->key_maps);
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kfree(kbd);
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}
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/*
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* Generate ascii -> ebcdic translation table from kbd_data.
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*/
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void
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kbd_ascebc(struct kbd_data *kbd, unsigned char *ascebc)
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{
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unsigned short *keymap, keysym;
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int i, j, k;
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memset(ascebc, 0x40, 256);
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for (i = 0; i < ARRAY_SIZE(key_maps); i++) {
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keymap = kbd->key_maps[i];
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if (!keymap)
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continue;
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for (j = 0; j < NR_KEYS; j++) {
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k = ((i & 1) << 7) + j;
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keysym = keymap[j];
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if (KTYP(keysym) == (KT_LATIN | 0xf0) ||
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KTYP(keysym) == (KT_LETTER | 0xf0))
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ascebc[KVAL(keysym)] = k;
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else if (KTYP(keysym) == (KT_DEAD | 0xf0))
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ascebc[ret_diacr[KVAL(keysym)]] = k;
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}
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}
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}
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#if 0
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/*
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* Generate ebcdic -> ascii translation table from kbd_data.
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*/
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void
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kbd_ebcasc(struct kbd_data *kbd, unsigned char *ebcasc)
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{
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unsigned short *keymap, keysym;
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int i, j, k;
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memset(ebcasc, ' ', 256);
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for (i = 0; i < ARRAY_SIZE(key_maps); i++) {
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keymap = kbd->key_maps[i];
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if (!keymap)
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continue;
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for (j = 0; j < NR_KEYS; j++) {
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keysym = keymap[j];
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k = ((i & 1) << 7) + j;
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if (KTYP(keysym) == (KT_LATIN | 0xf0) ||
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KTYP(keysym) == (KT_LETTER | 0xf0))
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ebcasc[k] = KVAL(keysym);
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else if (KTYP(keysym) == (KT_DEAD | 0xf0))
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ebcasc[k] = ret_diacr[KVAL(keysym)];
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}
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}
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}
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#endif
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/*
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* We have a combining character DIACR here, followed by the character CH.
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* If the combination occurs in the table, return the corresponding value.
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* Otherwise, if CH is a space or equals DIACR, return DIACR.
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* Otherwise, conclude that DIACR was not combining after all,
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* queue it and return CH.
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*/
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static unsigned int
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handle_diacr(struct kbd_data *kbd, unsigned int ch)
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{
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int i, d;
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d = kbd->diacr;
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kbd->diacr = 0;
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for (i = 0; i < kbd->accent_table_size; i++) {
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if (kbd->accent_table[i].diacr == d &&
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kbd->accent_table[i].base == ch)
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return kbd->accent_table[i].result;
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}
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if (ch == ' ' || ch == d)
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return d;
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kbd_put_queue(kbd->port, d);
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return ch;
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}
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/*
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* Handle dead key.
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*/
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static void
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k_dead(struct kbd_data *kbd, unsigned char value)
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{
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value = ret_diacr[value];
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kbd->diacr = (kbd->diacr ? handle_diacr(kbd, value) : value);
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}
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/*
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* Normal character handler.
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*/
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static void
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k_self(struct kbd_data *kbd, unsigned char value)
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{
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if (kbd->diacr)
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value = handle_diacr(kbd, value);
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kbd_put_queue(kbd->port, value);
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}
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/*
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* Special key handlers
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*/
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static void
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k_ignore(struct kbd_data *kbd, unsigned char value)
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{
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}
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/*
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* Function key handler.
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*/
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static void
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k_fn(struct kbd_data *kbd, unsigned char value)
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{
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if (kbd->func_table[value])
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kbd_puts_queue(kbd->port, kbd->func_table[value]);
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}
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static void
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k_spec(struct kbd_data *kbd, unsigned char value)
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{
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if (value >= NR_FN_HANDLER)
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return;
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if (kbd->fn_handler[value])
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kbd->fn_handler[value](kbd);
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}
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/*
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* Put utf8 character to tty flip buffer.
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* UTF-8 is defined for words of up to 31 bits,
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* but we need only 16 bits here
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*/
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static void
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to_utf8(struct tty_port *port, ushort c)
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{
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if (c < 0x80)
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/* 0******* */
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kbd_put_queue(port, c);
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else if (c < 0x800) {
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/* 110***** 10****** */
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kbd_put_queue(port, 0xc0 | (c >> 6));
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kbd_put_queue(port, 0x80 | (c & 0x3f));
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} else {
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/* 1110**** 10****** 10****** */
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kbd_put_queue(port, 0xe0 | (c >> 12));
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kbd_put_queue(port, 0x80 | ((c >> 6) & 0x3f));
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kbd_put_queue(port, 0x80 | (c & 0x3f));
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}
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}
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/*
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* Process keycode.
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*/
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void
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kbd_keycode(struct kbd_data *kbd, unsigned int keycode)
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{
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unsigned short keysym;
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unsigned char type, value;
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if (!kbd)
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return;
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if (keycode >= 384)
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keysym = kbd->key_maps[5][keycode - 384];
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else if (keycode >= 256)
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keysym = kbd->key_maps[4][keycode - 256];
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else if (keycode >= 128)
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keysym = kbd->key_maps[1][keycode - 128];
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else
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keysym = kbd->key_maps[0][keycode];
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type = KTYP(keysym);
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if (type >= 0xf0) {
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type -= 0xf0;
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if (type == KT_LETTER)
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type = KT_LATIN;
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value = KVAL(keysym);
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#ifdef CONFIG_MAGIC_SYSRQ /* Handle the SysRq Hack */
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if (kbd->sysrq) {
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if (kbd->sysrq == K(KT_LATIN, '-')) {
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kbd->sysrq = 0;
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handle_sysrq(value);
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return;
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}
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if (value == '-') {
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kbd->sysrq = K(KT_LATIN, '-');
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return;
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}
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/* Incomplete sysrq sequence. */
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(*k_handler[KTYP(kbd->sysrq)])(kbd, KVAL(kbd->sysrq));
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kbd->sysrq = 0;
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} else if ((type == KT_LATIN && value == '^') ||
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(type == KT_DEAD && ret_diacr[value] == '^')) {
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kbd->sysrq = K(type, value);
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return;
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}
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#endif
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(*k_handler[type])(kbd, value);
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} else
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to_utf8(kbd->port, keysym);
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}
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/*
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* Ioctl stuff.
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*/
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static int
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do_kdsk_ioctl(struct kbd_data *kbd, struct kbentry __user *user_kbe,
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int cmd, int perm)
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{
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struct kbentry tmp;
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ushort *key_map, val, ov;
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if (copy_from_user(&tmp, user_kbe, sizeof(struct kbentry)))
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return -EFAULT;
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#if NR_KEYS < 256
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if (tmp.kb_index >= NR_KEYS)
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return -EINVAL;
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#endif
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#if MAX_NR_KEYMAPS < 256
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if (tmp.kb_table >= MAX_NR_KEYMAPS)
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return -EINVAL;
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#endif
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switch (cmd) {
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case KDGKBENT:
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key_map = kbd->key_maps[tmp.kb_table];
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if (key_map) {
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val = U(key_map[tmp.kb_index]);
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if (KTYP(val) >= KBD_NR_TYPES)
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val = K_HOLE;
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} else
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val = (tmp.kb_index ? K_HOLE : K_NOSUCHMAP);
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return put_user(val, &user_kbe->kb_value);
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case KDSKBENT:
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if (!perm)
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return -EPERM;
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if (!tmp.kb_index && tmp.kb_value == K_NOSUCHMAP) {
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/* disallocate map */
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key_map = kbd->key_maps[tmp.kb_table];
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if (key_map) {
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kbd->key_maps[tmp.kb_table] = NULL;
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kfree(key_map);
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}
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break;
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}
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if (KTYP(tmp.kb_value) >= KBD_NR_TYPES)
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return -EINVAL;
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if (KVAL(tmp.kb_value) > kbd_max_vals[KTYP(tmp.kb_value)])
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return -EINVAL;
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if (!(key_map = kbd->key_maps[tmp.kb_table])) {
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int j;
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key_map = kmalloc(sizeof(plain_map),
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GFP_KERNEL);
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if (!key_map)
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return -ENOMEM;
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kbd->key_maps[tmp.kb_table] = key_map;
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for (j = 0; j < NR_KEYS; j++)
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key_map[j] = U(K_HOLE);
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}
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ov = U(key_map[tmp.kb_index]);
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if (tmp.kb_value == ov)
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break; /* nothing to do */
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/*
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* Attention Key.
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*/
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if (((ov == K_SAK) || (tmp.kb_value == K_SAK)) &&
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!capable(CAP_SYS_ADMIN))
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return -EPERM;
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key_map[tmp.kb_index] = U(tmp.kb_value);
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break;
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}
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return 0;
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}
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static int
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do_kdgkb_ioctl(struct kbd_data *kbd, struct kbsentry __user *u_kbs,
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int cmd, int perm)
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{
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unsigned char kb_func;
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char *p;
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int len;
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/* Get u_kbs->kb_func. */
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if (get_user(kb_func, &u_kbs->kb_func))
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return -EFAULT;
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#if MAX_NR_FUNC < 256
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if (kb_func >= MAX_NR_FUNC)
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return -EINVAL;
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#endif
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switch (cmd) {
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case KDGKBSENT:
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p = kbd->func_table[kb_func];
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if (p) {
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len = strlen(p);
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if (len >= sizeof(u_kbs->kb_string))
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len = sizeof(u_kbs->kb_string) - 1;
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if (copy_to_user(u_kbs->kb_string, p, len))
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return -EFAULT;
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} else
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len = 0;
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if (put_user('\0', u_kbs->kb_string + len))
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return -EFAULT;
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break;
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case KDSKBSENT:
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if (!perm)
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return -EPERM;
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len = strnlen_user(u_kbs->kb_string, sizeof(u_kbs->kb_string));
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if (!len)
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return -EFAULT;
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if (len > sizeof(u_kbs->kb_string))
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return -EINVAL;
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p = kmalloc(len, GFP_KERNEL);
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if (!p)
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return -ENOMEM;
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if (copy_from_user(p, u_kbs->kb_string, len)) {
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kfree(p);
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return -EFAULT;
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}
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/*
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* Make sure the string is terminated by 0. User could have
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* modified it between us running strnlen_user() and copying it.
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*/
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p[len - 1] = 0;
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kfree(kbd->func_table[kb_func]);
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kbd->func_table[kb_func] = p;
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break;
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}
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return 0;
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}
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int kbd_ioctl(struct kbd_data *kbd, unsigned int cmd, unsigned long arg)
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{
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struct tty_struct *tty;
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void __user *argp;
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unsigned int ct;
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int perm;
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argp = (void __user *)arg;
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/*
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* To have permissions to do most of the vt ioctls, we either have
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* to be the owner of the tty, or have CAP_SYS_TTY_CONFIG.
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*/
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tty = tty_port_tty_get(kbd->port);
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/* FIXME this test is pretty racy */
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perm = current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG);
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tty_kref_put(tty);
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switch (cmd) {
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case KDGKBTYPE:
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return put_user(KB_101, (char __user *)argp);
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case KDGKBENT:
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case KDSKBENT:
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return do_kdsk_ioctl(kbd, argp, cmd, perm);
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case KDGKBSENT:
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case KDSKBSENT:
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return do_kdgkb_ioctl(kbd, argp, cmd, perm);
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case KDGKBDIACR:
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{
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struct kbdiacrs __user *a = argp;
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struct kbdiacr diacr;
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int i;
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if (put_user(kbd->accent_table_size, &a->kb_cnt))
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return -EFAULT;
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for (i = 0; i < kbd->accent_table_size; i++) {
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diacr.diacr = kbd->accent_table[i].diacr;
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diacr.base = kbd->accent_table[i].base;
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diacr.result = kbd->accent_table[i].result;
|
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if (copy_to_user(a->kbdiacr + i, &diacr, sizeof(struct kbdiacr)))
|
|
return -EFAULT;
|
|
}
|
|
return 0;
|
|
}
|
|
case KDGKBDIACRUC:
|
|
{
|
|
struct kbdiacrsuc __user *a = argp;
|
|
|
|
ct = kbd->accent_table_size;
|
|
if (put_user(ct, &a->kb_cnt))
|
|
return -EFAULT;
|
|
if (copy_to_user(a->kbdiacruc, kbd->accent_table,
|
|
ct * sizeof(struct kbdiacruc)))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
case KDSKBDIACR:
|
|
{
|
|
struct kbdiacrs __user *a = argp;
|
|
struct kbdiacr diacr;
|
|
int i;
|
|
|
|
if (!perm)
|
|
return -EPERM;
|
|
if (get_user(ct, &a->kb_cnt))
|
|
return -EFAULT;
|
|
if (ct >= MAX_DIACR)
|
|
return -EINVAL;
|
|
kbd->accent_table_size = ct;
|
|
for (i = 0; i < ct; i++) {
|
|
if (copy_from_user(&diacr, a->kbdiacr + i, sizeof(struct kbdiacr)))
|
|
return -EFAULT;
|
|
kbd->accent_table[i].diacr = diacr.diacr;
|
|
kbd->accent_table[i].base = diacr.base;
|
|
kbd->accent_table[i].result = diacr.result;
|
|
}
|
|
return 0;
|
|
}
|
|
case KDSKBDIACRUC:
|
|
{
|
|
struct kbdiacrsuc __user *a = argp;
|
|
|
|
if (!perm)
|
|
return -EPERM;
|
|
if (get_user(ct, &a->kb_cnt))
|
|
return -EFAULT;
|
|
if (ct >= MAX_DIACR)
|
|
return -EINVAL;
|
|
kbd->accent_table_size = ct;
|
|
if (copy_from_user(kbd->accent_table, a->kbdiacruc,
|
|
ct * sizeof(struct kbdiacruc)))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
default:
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
}
|
|
|
|
EXPORT_SYMBOL(kbd_ioctl);
|
|
EXPORT_SYMBOL(kbd_ascebc);
|
|
EXPORT_SYMBOL(kbd_free);
|
|
EXPORT_SYMBOL(kbd_alloc);
|
|
EXPORT_SYMBOL(kbd_keycode);
|