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[PATCH] s390: cmm guest sender id

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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 *));