mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-23 02:54:32 +08:00
55045d47d7
This fixes a potential bug at drivers/char/hvc_beat.c. - hvc_put_term_char routine will decrement "rest" variable twice, and forget to advance "buf" pointer by "nlen" bytes. This bug was not hit previously because the output handler in drivers/char/hvc_console.c splits given output into 16 bytes at maximum. Reported-by: Timur Tabi <timur@freescale.com> Signed-off-by: Kou Ishizaki <kou.ishizaki@toshiba.co.jp> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Paul Mackerras <paulus@samba.org>
135 lines
3.2 KiB
C
135 lines
3.2 KiB
C
/*
|
|
* Beat hypervisor console driver
|
|
*
|
|
* (C) Copyright 2006 TOSHIBA CORPORATION
|
|
*
|
|
* This code is based on drivers/char/hvc_rtas.c:
|
|
* (C) Copyright IBM Corporation 2001-2005
|
|
* (C) Copyright Red Hat, Inc. 2005
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/err.h>
|
|
#include <linux/string.h>
|
|
#include <linux/console.h>
|
|
#include <asm/prom.h>
|
|
#include <asm/hvconsole.h>
|
|
#include <asm/firmware.h>
|
|
|
|
#include "hvc_console.h"
|
|
|
|
extern int64_t beat_get_term_char(uint64_t, uint64_t *, uint64_t *, uint64_t *);
|
|
extern int64_t beat_put_term_char(uint64_t, uint64_t, uint64_t, uint64_t);
|
|
|
|
struct hvc_struct *hvc_beat_dev = NULL;
|
|
|
|
/* bug: only one queue is available regardless of vtermno */
|
|
static int hvc_beat_get_chars(uint32_t vtermno, char *buf, int cnt)
|
|
{
|
|
static unsigned char q[sizeof(unsigned long) * 2]
|
|
__attribute__((aligned(sizeof(unsigned long))));
|
|
static int qlen = 0;
|
|
unsigned long got;
|
|
|
|
again:
|
|
if (qlen) {
|
|
if (qlen > cnt) {
|
|
memcpy(buf, q, cnt);
|
|
qlen -= cnt;
|
|
memmove(q + cnt, q, qlen);
|
|
return cnt;
|
|
} else { /* qlen <= cnt */
|
|
int r;
|
|
|
|
memcpy(buf, q, qlen);
|
|
r = qlen;
|
|
qlen = 0;
|
|
return r;
|
|
}
|
|
}
|
|
if (beat_get_term_char(vtermno, &got,
|
|
((unsigned long *)q), ((unsigned long *)q) + 1) == 0) {
|
|
qlen = got;
|
|
goto again;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int hvc_beat_put_chars(uint32_t vtermno, const char *buf, int cnt)
|
|
{
|
|
unsigned long kb[2];
|
|
int rest, nlen;
|
|
|
|
for (rest = cnt; rest > 0; rest -= nlen) {
|
|
nlen = (rest > 16) ? 16 : rest;
|
|
memcpy(kb, buf, nlen);
|
|
beat_put_term_char(vtermno, nlen, kb[0], kb[1]);
|
|
buf += nlen;
|
|
}
|
|
return cnt;
|
|
}
|
|
|
|
static struct hv_ops hvc_beat_get_put_ops = {
|
|
.get_chars = hvc_beat_get_chars,
|
|
.put_chars = hvc_beat_put_chars,
|
|
};
|
|
|
|
static int hvc_beat_useit = 1;
|
|
|
|
static int hvc_beat_config(char *p)
|
|
{
|
|
hvc_beat_useit = simple_strtoul(p, NULL, 0);
|
|
return 0;
|
|
}
|
|
|
|
static int __init hvc_beat_console_init(void)
|
|
{
|
|
if (hvc_beat_useit && machine_is_compatible("Beat")) {
|
|
hvc_instantiate(0, 0, &hvc_beat_get_put_ops);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* temp */
|
|
static int __init hvc_beat_init(void)
|
|
{
|
|
struct hvc_struct *hp;
|
|
|
|
if (!firmware_has_feature(FW_FEATURE_BEAT))
|
|
return -ENODEV;
|
|
|
|
hp = hvc_alloc(0, NO_IRQ, &hvc_beat_get_put_ops, 16);
|
|
if (IS_ERR(hp))
|
|
return PTR_ERR(hp);
|
|
hvc_beat_dev = hp;
|
|
return 0;
|
|
}
|
|
|
|
static void __exit hvc_beat_exit(void)
|
|
{
|
|
if (hvc_beat_dev)
|
|
hvc_remove(hvc_beat_dev);
|
|
}
|
|
|
|
module_init(hvc_beat_init);
|
|
module_exit(hvc_beat_exit);
|
|
|
|
__setup("hvc_beat=", hvc_beat_config);
|
|
|
|
console_initcall(hvc_beat_console_init);
|