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[PATCH] Fix buffer overflow and races in capi debug functions 

The CAPI trace debug functions were using a fixed size buffer, which can be
overflowed if wrong formatted CAPI messages were sent to the kernel capi
layer.  The code was also not protected against multiple callers.  This fix
bug 8028.

Additionally the patch make the CAPI trace functions optional.

Signed-off-by: Karsten Keil <kkeil@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Karsten Keil 2007-02-28 20:13:50 -08:00 committed by Linus Torvalds
parent 34bbd70405
commit 17f0cd2f35
5 changed files with 318 additions and 78 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/isdn/capi/Kconfig
View File

@ -2,13 +2,25 @@
# Config.in for the CAPI subsystem
#
config ISDN_DRV_AVMB1_VERBOSE_REASON
bool "Verbose reason code reporting (kernel size +=7K)"
bool "Verbose reason code reporting"
depends on ISDN_CAPI
default y
help
If you say Y here, the AVM B1 driver will give verbose reasons for
If you say Y here, the CAPI drivers will give verbose reasons for
disconnecting. This will increase the size of the kernel by 7 KB. If
unsure, say Y.
config CAPI_TRACE
bool "CAPI trace support"
depends on ISDN_CAPI
default y
help
If you say Y here, the kernelcapi driver can make verbose traces
of CAPI messages. This feature can be enabled/disabled via IOCTL for
every controler (default disabled).
This will increase the size of the kernelcapi module by 20 KB.
If unsure, say Y.
config ISDN_CAPI_MIDDLEWARE
bool "CAPI2.0 Middleware support (EXPERIMENTAL)"
depends on ISDN_CAPI && EXPERIMENTAL

28
drivers/isdn/capi/capidrv.c
View File

@ -990,6 +990,7 @@ static void handle_plci(_cmsg * cmsg)
capidrv_contr *card = findcontrbynumber(cmsg->adr.adrController & 0x7f);
capidrv_plci *plcip;
isdn_ctrl cmd;
_cdebbuf *cdb;
if (!card) {
printk(KERN_ERR "capidrv: %s from unknown controller 0x%x\n",
@ -1122,8 +1123,15 @@ static void handle_plci(_cmsg * cmsg)
break;
}
}
printk(KERN_ERR "capidrv-%d: %s\n",
card->contrnr, capi_cmsg2str(cmsg));
cdb = capi_cmsg2str(cmsg);
if (cdb) {
printk(KERN_WARNING "capidrv-%d: %s\n",
card->contrnr, cdb->buf);
cdebbuf_free(cdb);
} else
printk(KERN_WARNING "capidrv-%d: CAPI_INFO_IND InfoNumber %x not handled\n",
card->contrnr, cmsg->InfoNumber);
break;
case CAPI_CONNECT_ACTIVE_CONF: /* plci */
@ -1371,10 +1379,18 @@ static _cmsg s_cmsg;
static void capidrv_recv_message(struct capi20_appl *ap, struct sk_buff *skb)
{
capi_message2cmsg(&s_cmsg, skb->data);
if (debugmode > 3)
printk(KERN_DEBUG "capidrv_signal: applid=%d %s\n",
ap->applid, capi_cmsg2str(&s_cmsg));
if (debugmode > 3) {
_cdebbuf *cdb = capi_cmsg2str(&s_cmsg);
if (cdb) {
printk(KERN_DEBUG "%s: applid=%d %s\n", __FUNCTION__,
ap->applid, cdb->buf);
cdebbuf_free(cdb);
} else
printk(KERN_DEBUG "%s: applid=%d %s not traced\n",
__FUNCTION__, ap->applid,
capi_cmd2str(s_cmsg.Command, s_cmsg.Subcommand));
}
if (s_cmsg.Command == CAPI_DATA_B3
&& s_cmsg.Subcommand == CAPI_IND) {
handle_data(&s_cmsg, skb);

254
drivers/isdn/capi/capiutil.c
View File

@ -648,6 +648,9 @@ char *capi_cmd2str(u8 cmd, u8 subcmd)
/*-------------------------------------------------------*/
#ifdef CONFIG_CAPI_TRACE
/*-------------------------------------------------------*/
static char *pnames[] =
@ -703,44 +706,77 @@ static char *pnames[] =
};
static char buf[8192];
static char *p = NULL;
#include <stdarg.h>
/*-------------------------------------------------------*/
static void bufprint(char *fmt,...)
static _cdebbuf *bufprint(_cdebbuf *cdb, char *fmt,...)
{
va_list f;
size_t n,r;
if (!cdb)
return NULL;
va_start(f, fmt);
vsprintf(p, fmt, f);
r = cdb->size - cdb->pos;
n = vsnprintf(cdb->p, r, fmt, f);
va_end(f);
p += strlen(p);
if (n >= r) {
/* truncated, need bigger buffer */
size_t ns = 2 * cdb->size;
u_char *nb;
while ((ns - cdb->pos) <= n)
ns *= 2;
nb = kmalloc(ns, GFP_ATOMIC);
if (!nb) {
cdebbuf_free(cdb);
return NULL;
}
memcpy(nb, cdb->buf, cdb->pos);
kfree(cdb->buf);
nb[cdb->pos] = 0;
cdb->buf = nb;
cdb->p = cdb->buf + cdb->pos;
cdb->size = ns;
va_start(f, fmt);
r = cdb->size - cdb->pos;
n = vsnprintf(cdb->p, r, fmt, f);
va_end(f);
}
cdb->p += n;
cdb->pos += n;
return cdb;
}
static void printstructlen(u8 * m, unsigned len)
static _cdebbuf *printstructlen(_cdebbuf *cdb, u8 * m, unsigned len)
{
unsigned hex = 0;
if (!cdb)
return NULL;
for (; len; len--, m++)
if (isalnum(*m) || *m == ' ') {
if (hex)
bufprint(">");
bufprint("%c", *m);
cdb = bufprint(cdb, ">");
cdb = bufprint(cdb, "%c", *m);
hex = 0;
} else {
if (!hex)
bufprint("<%02x", *m);
cdb = bufprint(cdb, "<%02x", *m);
else
bufprint(" %02x", *m);
cdb = bufprint(cdb, " %02x", *m);
hex = 1;
}
if (hex)
bufprint(">");
cdb = bufprint(cdb, ">");
return cdb;
}
static void printstruct(u8 * m)
static _cdebbuf *printstruct(_cdebbuf *cdb, u8 * m)
{
unsigned len;
if (m[0] != 0xff) {
len = m[0];
m += 1;
@ -748,42 +784,45 @@ static void printstruct(u8 * m)
len = ((u16 *) (m + 1))[0];
m += 3;
}
printstructlen(m, len);
cdb = printstructlen(cdb, m, len);
return cdb;
}
/*-------------------------------------------------------*/
#define NAME (pnames[cmsg->par[cmsg->p]])
static void protocol_message_2_pars(_cmsg * cmsg, int level)
static _cdebbuf *protocol_message_2_pars(_cdebbuf *cdb, _cmsg *cmsg, int level)
{
for (; TYP != _CEND; cmsg->p++) {
int slen = 29 + 3 - level;
int i;
bufprint(" ");
if (!cdb)
return NULL;
cdb = bufprint(cdb, " ");
for (i = 0; i < level - 1; i++)
bufprint(" ");
cdb = bufprint(cdb, " ");
switch (TYP) {
case _CBYTE:
bufprint("%-*s = 0x%x\n", slen, NAME, *(u8 *) (cmsg->m + cmsg->l));
cdb = bufprint(cdb, "%-*s = 0x%x\n", slen, NAME, *(u8 *) (cmsg->m + cmsg->l));
cmsg->l++;
break;
case _CWORD:
bufprint("%-*s = 0x%x\n", slen, NAME, *(u16 *) (cmsg->m + cmsg->l));
cdb = bufprint(cdb, "%-*s = 0x%x\n", slen, NAME, *(u16 *) (cmsg->m + cmsg->l));
cmsg->l += 2;
break;
case _CDWORD:
bufprint("%-*s = 0x%lx\n", slen, NAME, *(u32 *) (cmsg->m + cmsg->l));
cdb = bufprint(cdb, "%-*s = 0x%lx\n", slen, NAME, *(u32 *) (cmsg->m + cmsg->l));
cmsg->l += 4;
break;
case _CSTRUCT:
bufprint("%-*s = ", slen, NAME);
cdb = bufprint(cdb, "%-*s = ", slen, NAME);
if (cmsg->m[cmsg->l] == '\0')
bufprint("default");
cdb = bufprint(cdb, "default");
else
printstruct(cmsg->m + cmsg->l);
bufprint("\n");
cdb = printstruct(cdb, cmsg->m + cmsg->l);
cdb = bufprint(cdb, "\n");
if (cmsg->m[cmsg->l] != 0xff)
cmsg->l += 1 + cmsg->m[cmsg->l];
else
@ -794,61 +833,184 @@ static void protocol_message_2_pars(_cmsg * cmsg, int level)
case _CMSTRUCT:
/*----- Metastruktur 0 -----*/
if (cmsg->m[cmsg->l] == '\0') {
bufprint("%-*s = default\n", slen, NAME);
cdb = bufprint(cdb, "%-*s = default\n", slen, NAME);
cmsg->l++;
jumpcstruct(cmsg);
} else {
char *name = NAME;
unsigned _l = cmsg->l;
bufprint("%-*s\n", slen, name);
cdb = bufprint(cdb, "%-*s\n", slen, name);
cmsg->l = (cmsg->m + _l)[0] == 255 ? cmsg->l + 3 : cmsg->l + 1;
cmsg->p++;
protocol_message_2_pars(cmsg, level + 1);
cdb = protocol_message_2_pars(cdb, cmsg, level + 1);
}
break;
}
}
return cdb;
}
/*-------------------------------------------------------*/
char *capi_message2str(u8 * msg)
static _cdebbuf *g_debbuf;
static u_long g_debbuf_lock;
static _cmsg *g_cmsg;
_cdebbuf *cdebbuf_alloc(void)
{
_cdebbuf *cdb;
_cmsg cmsg;
p = buf;
p[0] = 0;
if (likely(!test_and_set_bit(1, &g_debbuf_lock))) {
cdb = g_debbuf;
goto init;
} else
cdb = kmalloc(sizeof(_cdebbuf), GFP_ATOMIC);
if (!cdb)
return NULL;
cdb->buf = kmalloc(CDEBUG_SIZE, GFP_ATOMIC);
if (!cdb->buf) {
kfree(cdb);
return NULL;
}
cdb->size = CDEBUG_SIZE;
init:
cdb->buf[0] = 0;
cdb->p = cdb->buf;
cdb->pos = 0;
return cdb;
}
cmsg.m = msg;
cmsg.l = 8;
cmsg.p = 0;
byteTRcpy(cmsg.m + 4, &cmsg.Command);
byteTRcpy(cmsg.m + 5, &cmsg.Subcommand);
cmsg.par = cpars[command_2_index(cmsg.Command, cmsg.Subcommand)];
void cdebbuf_free(_cdebbuf *cdb)
{
if (likely(cdb == g_debbuf)) {
test_and_clear_bit(1, &g_debbuf_lock);
return;
}
if (likely(cdb))
kfree(cdb->buf);
kfree(cdb);
}
bufprint("%-26s ID=%03d #0x%04x LEN=%04d\n",
mnames[command_2_index(cmsg.Command, cmsg.Subcommand)],
_cdebbuf *capi_message2str(u8 * msg)
{
_cdebbuf *cdb;
_cmsg *cmsg;
cdb = cdebbuf_alloc();
if (unlikely(!cdb))
return NULL;
if (likely(cdb == g_debbuf))
cmsg = g_cmsg;
else
cmsg = kmalloc(sizeof(_cmsg), GFP_ATOMIC);
if (unlikely(!cmsg)) {
cdebbuf_free(cdb);
return NULL;
}
cmsg->m = msg;
cmsg->l = 8;
cmsg->p = 0;
byteTRcpy(cmsg->m + 4, &cmsg->Command);
byteTRcpy(cmsg->m + 5, &cmsg->Subcommand);
cmsg->par = cpars[command_2_index(cmsg->Command, cmsg->Subcommand)];
cdb = bufprint(cdb, "%-26s ID=%03d #0x%04x LEN=%04d\n",
mnames[command_2_index(cmsg->Command, cmsg->Subcommand)],
((unsigned short *) msg)[1],
((unsigned short *) msg)[3],
((unsigned short *) msg)[0]);
protocol_message_2_pars(&cmsg, 1);
return buf;
cdb = protocol_message_2_pars(cdb, cmsg, 1);
if (unlikely(cmsg != g_cmsg))
kfree(cmsg);
return cdb;
}
char *capi_cmsg2str(_cmsg * cmsg)
_cdebbuf *capi_cmsg2str(_cmsg * cmsg)
{
p = buf;
p[0] = 0;
_cdebbuf *cdb;
cdb = cdebbuf_alloc();
if (!cdb)
return NULL;
cmsg->l = 8;
cmsg->p = 0;
bufprint("%s ID=%03d #0x%04x LEN=%04d\n",
cdb = bufprint(cdb, "%s ID=%03d #0x%04x LEN=%04d\n",
mnames[command_2_index(cmsg->Command, cmsg->Subcommand)],
((u16 *) cmsg->m)[1],
((u16 *) cmsg->m)[3],
((u16 *) cmsg->m)[0]);
protocol_message_2_pars(cmsg, 1);
return buf;
cdb = protocol_message_2_pars(cdb, cmsg, 1);
return cdb;
}
int __init cdebug_init(void)
{
g_cmsg= kmalloc(sizeof(_cmsg), GFP_KERNEL);
if (!g_cmsg)
return ENOMEM;
g_debbuf = kmalloc(sizeof(_cdebbuf), GFP_KERNEL);
if (!g_debbuf) {
kfree(g_cmsg);
return ENOMEM;
}
g_debbuf->buf = kmalloc(CDEBUG_GSIZE, GFP_KERNEL);
if (!g_debbuf->buf) {
kfree(g_cmsg);
kfree(g_debbuf);
return ENOMEM;;
}
g_debbuf->size = CDEBUG_GSIZE;
g_debbuf->buf[0] = 0;
g_debbuf->p = g_debbuf->buf;
g_debbuf->pos = 0;
return 0;
}
void __exit cdebug_exit(void)
{
if (g_debbuf)
kfree(g_debbuf->buf);
kfree(g_debbuf);
kfree(g_cmsg);
}
#else /* !CONFIG_CAPI_TRACE */
static _cdebbuf g_debbuf = {"CONFIG_CAPI_TRACE not enabled", NULL, 0, 0};
_cdebbuf *capi_message2str(u8 * msg)
{
return &g_debbuf;
}
_cdebbuf *capi_cmsg2str(_cmsg * cmsg)
{
return &g_debbuf;
}
_cdebbuf *cdebbuf_alloc(void)
{
return &g_debbuf;
}
void cdebbuf_free(_cdebbuf *cdb)
{
}
int __init cdebug_init(void)
{
return 0;
}
void __exit cdebug_exit(void)
{
}
#endif
EXPORT_SYMBOL(cdebbuf_alloc);
EXPORT_SYMBOL(cdebbuf_free);
EXPORT_SYMBOL(capi_cmsg2message);
EXPORT_SYMBOL(capi_message2cmsg);
EXPORT_SYMBOL(capi_cmsg_header);

77
drivers/isdn/capi/kcapi.c
View File

@ -276,10 +276,17 @@ void capi_ctr_handle_message(struct capi_ctr * card, u16 appl, struct sk_buff *s
int showctl = 0;
u8 cmd, subcmd;
unsigned long flags;
_cdebbuf *cdb;
if (card->cardstate != CARD_RUNNING) {
printk(KERN_INFO "kcapi: controller %d not active, got: %s",
card->cnr, capi_message2str(skb->data));
cdb = capi_message2str(skb->data);
if (cdb) {
printk(KERN_INFO "kcapi: controller [%03d] not active, got: %s",
card->cnr, cdb->buf);
cdebbuf_free(cdb);
} else
printk(KERN_INFO "kcapi: controller [%03d] not active, cannot trace\n",
card->cnr);
goto error;
}
@ -295,15 +302,21 @@ void capi_ctr_handle_message(struct capi_ctr * card, u16 appl, struct sk_buff *s
showctl |= (card->traceflag & 1);
if (showctl & 2) {
if (showctl & 1) {
printk(KERN_DEBUG "kcapi: got [0x%lx] id#%d %s len=%u\n",
(unsigned long) card->cnr,
CAPIMSG_APPID(skb->data),
printk(KERN_DEBUG "kcapi: got [%03d] id#%d %s len=%u\n",
card->cnr, CAPIMSG_APPID(skb->data),
capi_cmd2str(cmd, subcmd),
CAPIMSG_LEN(skb->data));
} else {
printk(KERN_DEBUG "kcapi: got [0x%lx] %s\n",
(unsigned long) card->cnr,
capi_message2str(skb->data));
cdb = capi_message2str(skb->data);
if (cdb) {
printk(KERN_DEBUG "kcapi: got [%03d] %s\n",
card->cnr, cdb->buf);
cdebbuf_free(cdb);
} else
printk(KERN_DEBUG "kcapi: got [%03d] id#%d %s len=%u, cannot trace\n",
card->cnr, CAPIMSG_APPID(skb->data),
capi_cmd2str(cmd, subcmd),
CAPIMSG_LEN(skb->data));
}
}
@ -312,8 +325,15 @@ void capi_ctr_handle_message(struct capi_ctr * card, u16 appl, struct sk_buff *s
ap = get_capi_appl_by_nr(CAPIMSG_APPID(skb->data));
if ((!ap) || (ap->release_in_progress)) {
read_unlock_irqrestore(&application_lock, flags);
printk(KERN_ERR "kcapi: handle_message: applid %d state released (%s)\n",
CAPIMSG_APPID(skb->data), capi_message2str(skb->data));
cdb = capi_message2str(skb->data);
if (cdb) {
printk(KERN_ERR "kcapi: handle_message: applid %d state released (%s)\n",
CAPIMSG_APPID(skb->data), cdb->buf);
cdebbuf_free(cdb);
} else
printk(KERN_ERR "kcapi: handle_message: applid %d state released (%s) cannot trace\n",
CAPIMSG_APPID(skb->data),
capi_cmd2str(cmd, subcmd));
goto error;
}
skb_queue_tail(&ap->recv_queue, skb);
@ -332,7 +352,7 @@ void capi_ctr_ready(struct capi_ctr * card)
{
card->cardstate = CARD_RUNNING;
printk(KERN_NOTICE "kcapi: card %d \"%s\" ready.\n",
printk(KERN_NOTICE "kcapi: card [%03d] \"%s\" ready.\n",
card->cnr, card->name);
notify_push(KCI_CONTRUP, card->cnr, 0, 0);
@ -364,7 +384,7 @@ void capi_ctr_reseted(struct capi_ctr * card)
capi_ctr_put(card);
}
printk(KERN_NOTICE "kcapi: card %d down.\n", card->cnr);
printk(KERN_NOTICE "kcapi: card [%03d] down.\n", card->cnr);
notify_push(KCI_CONTRDOWN, card->cnr, 0, 0);
}
@ -374,7 +394,7 @@ EXPORT_SYMBOL(capi_ctr_reseted);
void capi_ctr_suspend_output(struct capi_ctr *card)
{
if (!card->blocked) {
printk(KERN_DEBUG "kcapi: card %d suspend\n", card->cnr);
printk(KERN_DEBUG "kcapi: card [%03d] suspend\n", card->cnr);
card->blocked = 1;
}
}
@ -384,7 +404,7 @@ EXPORT_SYMBOL(capi_ctr_suspend_output);
void capi_ctr_resume_output(struct capi_ctr *card)
{
if (card->blocked) {
printk(KERN_DEBUG "kcapi: card %d resume\n", card->cnr);
printk(KERN_DEBUG "kcapi: card [%03d] resume\n", card->cnr);
card->blocked = 0;
}
}
@ -432,7 +452,7 @@ attach_capi_ctr(struct capi_ctr *card)
}
ncards++;
printk(KERN_NOTICE "kcapi: Controller %d: %s attached\n",
printk(KERN_NOTICE "kcapi: Controller [%03d]: %s attached\n",
card->cnr, card->name);
return 0;
}
@ -451,7 +471,7 @@ int detach_capi_ctr(struct capi_ctr *card)
card->procent = NULL;
}
capi_cards[card->cnr - 1] = NULL;
printk(KERN_NOTICE "kcapi: Controller %d: %s unregistered\n",
printk(KERN_NOTICE "kcapi: Controller [%03d]: %s unregistered\n",
card->cnr, card->name);
return 0;
@ -623,17 +643,25 @@ u16 capi20_put_message(struct capi20_appl *ap, struct sk_buff *skb)
showctl |= (card->traceflag & 1);
if (showctl & 2) {
if (showctl & 1) {
printk(KERN_DEBUG "kcapi: put [%#x] id#%d %s len=%u\n",
printk(KERN_DEBUG "kcapi: put [%03d] id#%d %s len=%u\n",
CAPIMSG_CONTROLLER(skb->data),
CAPIMSG_APPID(skb->data),
capi_cmd2str(cmd, subcmd),
CAPIMSG_LEN(skb->data));
} else {
printk(KERN_DEBUG "kcapi: put [%#x] %s\n",
CAPIMSG_CONTROLLER(skb->data),
capi_message2str(skb->data));
_cdebbuf *cdb = capi_message2str(skb->data);
if (cdb) {
printk(KERN_DEBUG "kcapi: put [%03d] %s\n",
CAPIMSG_CONTROLLER(skb->data),
cdb->buf);
cdebbuf_free(cdb);
} else
printk(KERN_DEBUG "kcapi: put [%03d] id#%d %s len=%u cannot trace\n",
CAPIMSG_CONTROLLER(skb->data),
CAPIMSG_APPID(skb->data),
capi_cmd2str(cmd, subcmd),
CAPIMSG_LEN(skb->data));
}
}
return card->send_message(card, skb);
}
@ -894,7 +922,7 @@ int capi20_manufacturer(unsigned int cmd, void __user *data)
return -ESRCH;
card->traceflag = fdef.flag;
printk(KERN_INFO "kcapi: contr %d set trace=%d\n",
printk(KERN_INFO "kcapi: contr [%03d] set trace=%d\n",
card->cnr, card->traceflag);
return 0;
}
@ -967,7 +995,11 @@ static int __init kcapi_init(void)
{
char *p;
char rev[32];
int ret;
ret = cdebug_init();
if (ret)
return ret;
kcapi_proc_init();
if ((p = strchr(revision, ':')) != 0 && p[1]) {
@ -988,6 +1020,7 @@ static void __exit kcapi_exit(void)
/* make sure all notifiers are finished */
flush_scheduled_work();
cdebug_exit();
}
module_init(kcapi_init);

21
include/linux/isdn/capiutil.h
View File

@ -174,9 +174,26 @@ char *capi_info2str(__u16 reason);
/*
* Debugging / Tracing functions
*/
char *capi_cmd2str(__u8 cmd, __u8 subcmd);
char *capi_cmsg2str(_cmsg * cmsg);
char *capi_message2str(__u8 * msg);
typedef struct {
u_char *buf;
u_char *p;
size_t size;
size_t pos;
} _cdebbuf;
#define CDEBUG_SIZE 1024
#define CDEBUG_GSIZE 4096
_cdebbuf *cdebbuf_alloc(void);
void cdebbuf_free(_cdebbuf *cdb);
int cdebug_init(void);
void cdebug_exit(void);
_cdebbuf *capi_cmsg2str(_cmsg *cmsg);
_cdebbuf *capi_message2str(__u8 *msg);
/*-----------------------------------------------------------------------*/