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[PATCH] s390: cmm guest sender id 

An arbitrary guest must not be allowed to trigger cmm actions.  Only one
specific guest namely the one that serves as the resource monitor may send cmm
messages.  Add a parameter that allows to specify the guest that may send
messages.  z/VMs resource manager has the name 'VMRMSVM' which is the default.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Martin Schwidefsky 2005-05-01 08:58:58 -07:00 committed by Linus Torvalds
parent 0b642ede47
commit 15439d74f6
3 changed files with 24 additions and 8 deletions
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9
arch/s390/mm/cmm.c
View File

@ -20,6 +20,11 @@
#include <asm/pgalloc.h>
#include <asm/uaccess.h>
static char *sender = "VMRMSVM";
module_param(sender, charp, 0);
MODULE_PARM_DESC(sender,
"Guest name that may send SMSG messages (default VMRMSVM)");
#include "../../../drivers/s390/net/smsgiucv.h"
#define CMM_NR_PAGES ((PAGE_SIZE / sizeof(unsigned long)) - 2)
@ -367,10 +372,12 @@ static struct ctl_table cmm_dir_table[] = {
#ifdef CONFIG_CMM_IUCV
#define SMSG_PREFIX "CMM"
static void
cmm_smsg_target(char *msg)
cmm_smsg_target(char *from, char *msg)
{
long pages, seconds;
if (strlen(sender) > 0 && strcmp(from, sender) != 0)
return;
if (!cmm_skip_blanks(msg + strlen(SMSG_PREFIX), &msg))
return;
if (strncmp(msg, "SHRINK", 6) == 0) {

19
drivers/s390/net/smsgiucv.c
View File

@ -32,7 +32,7 @@ struct smsg_callback {
struct list_head list;
char *prefix;
int len;
void (*callback)(char *str);
void (*callback)(char *from, char *str);
};
MODULE_AUTHOR
@ -55,8 +55,9 @@ smsg_message_pending(iucv_MessagePending *eib, void *pgm_data)
{
struct smsg_callback *cb;
unsigned char *msg;
unsigned char sender[9];
unsigned short len;
int rc;
int rc, i;
len = eib->ln1msg2.ipbfln1f;
msg = kmalloc(len + 1, GFP_ATOMIC|GFP_DMA);
@ -69,10 +70,18 @@ smsg_message_pending(iucv_MessagePending *eib, void *pgm_data)
if (rc == 0) {
msg[len] = 0;
EBCASC(msg, len);
memcpy(sender, msg, 8);
sender[8] = 0;
/* Remove trailing whitespace from the sender name. */
for (i = 7; i >= 0; i--) {
if (sender[i] != ' ' && sender[i] != '\t')
break;
sender[i] = 0;
}
spin_lock(&smsg_list_lock);
list_for_each_entry(cb, &smsg_list, list)
if (strncmp(msg + 8, cb->prefix, cb->len) == 0) {
cb->callback(msg + 8);
cb->callback(sender, msg + 8);
break;
}
spin_unlock(&smsg_list_lock);
@ -91,7 +100,7 @@ static struct device_driver smsg_driver = {
};
int
smsg_register_callback(char *prefix, void (*callback)(char *str))
smsg_register_callback(char *prefix, void (*callback)(char *from, char *str))
{
struct smsg_callback *cb;
@ -108,7 +117,7 @@ smsg_register_callback(char *prefix, void (*callback)(char *str))
}
void
smsg_unregister_callback(char *prefix, void (*callback)(char *str))
smsg_unregister_callback(char *prefix, void (*callback)(char *from, char *str))
{
struct smsg_callback *cb, *tmp;

4
drivers/s390/net/smsgiucv.h
View File

@ -5,6 +5,6 @@
* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
*/
int smsg_register_callback(char *, void (*)(char *));
void smsg_unregister_callback(char *, void (*)(char *));
int smsg_register_callback(char *, void (*)(char *, char *));
void smsg_unregister_callback(char *, void (*)(char *, char *));