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authorHorst Hummel <horst.hummel@de.ibm.com>2006-06-29 14:57:52 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2006-06-29 14:57:52 +0200
commit445b5b499e0ca1584ee3aa8af298c9ef8c84d711 (patch)
tree8ba190d75ff787f61bca06b59017ffea43b5aeb7
parentf45a43d847c96949d22e702879e52385a1547f6b (diff)
downloadop-kernel-dev-445b5b499e0ca1584ee3aa8af298c9ef8c84d711.zip
op-kernel-dev-445b5b499e0ca1584ee3aa8af298c9ef8c84d711.tar.gz
[S390] dasd_eckd_dump_sense bug.
The ccw dump function dasd_eckd_dump_ccw_range can crash because it does not take care about the IDAL flag in the ccw. Check for IDALs flag set in CCW and follow the indirect list to print the data that is refered by the ccw. Signed-off-by: Horst Hummel <horst.hummel@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
-rw-r--r--drivers/s390/block/dasd_eckd.c145
1 files changed, 74 insertions, 71 deletions
diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index 7d5a6cee..7565d30 100644
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -1522,6 +1522,40 @@ dasd_eckd_ioctl(struct dasd_device *device, unsigned int cmd, void __user *argp)
}
/*
+ * Dump the range of CCWs into 'page' buffer
+ * and return number of printed chars.
+ */
+static inline int
+dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
+{
+ int len, count;
+ char *datap;
+
+ len = 0;
+ while (from <= to) {
+ len += sprintf(page + len, KERN_ERR PRINTK_HEADER
+ " CCW %p: %08X %08X DAT:",
+ from, ((int *) from)[0], ((int *) from)[1]);
+
+ /* get pointer to data (consider IDALs) */
+ if (from->flags & CCW_FLAG_IDA)
+ datap = (char *) *((addr_t *) (addr_t) from->cda);
+ else
+ datap = (char *) ((addr_t) from->cda);
+
+ /* dump data (max 32 bytes) */
+ for (count = 0; count < from->count && count < 32; count++) {
+ if (count % 8 == 0) len += sprintf(page + len, " ");
+ if (count % 4 == 0) len += sprintf(page + len, " ");
+ len += sprintf(page + len, "%02x", datap[count]);
+ }
+ len += sprintf(page + len, "\n");
+ from++;
+ }
+ return len;
+}
+
+/*
* Print sense data and related channel program.
* Parts are printed because printk buffer is only 1024 bytes.
*/
@@ -1530,8 +1564,8 @@ dasd_eckd_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
struct irb *irb)
{
char *page;
- struct ccw1 *act, *end, *last;
- int len, sl, sct, count;
+ struct ccw1 *first, *last, *fail, *from, *to;
+ int len, sl, sct;
page = (char *) get_zeroed_page(GFP_ATOMIC);
if (page == NULL) {
@@ -1539,7 +1573,8 @@ dasd_eckd_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
"No memory to dump sense data");
return;
}
- len = sprintf(page, KERN_ERR PRINTK_HEADER
+ /* dump the sense data */
+ len = sprintf(page, KERN_ERR PRINTK_HEADER
" I/O status report for device %s:\n",
device->cdev->dev.bus_id);
len += sprintf(page + len, KERN_ERR PRINTK_HEADER
@@ -1564,87 +1599,55 @@ dasd_eckd_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
if (irb->ecw[27] & DASD_SENSE_BIT_0) {
/* 24 Byte Sense Data */
- len += sprintf(page + len, KERN_ERR PRINTK_HEADER
- " 24 Byte: %x MSG %x, "
- "%s MSGb to SYSOP\n",
- irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
- irb->ecw[1] & 0x10 ? "" : "no");
+ sprintf(page + len, KERN_ERR PRINTK_HEADER
+ " 24 Byte: %x MSG %x, "
+ "%s MSGb to SYSOP\n",
+ irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
+ irb->ecw[1] & 0x10 ? "" : "no");
} else {
/* 32 Byte Sense Data */
- len += sprintf(page + len, KERN_ERR PRINTK_HEADER
- " 32 Byte: Format: %x "
- "Exception class %x\n",
- irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
+ sprintf(page + len, KERN_ERR PRINTK_HEADER
+ " 32 Byte: Format: %x "
+ "Exception class %x\n",
+ irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
}
} else {
- len += sprintf(page + len, KERN_ERR PRINTK_HEADER
- " SORRY - NO VALID SENSE AVAILABLE\n");
+ sprintf(page + len, KERN_ERR PRINTK_HEADER
+ " SORRY - NO VALID SENSE AVAILABLE\n");
}
- MESSAGE_LOG(KERN_ERR, "%s",
- page + sizeof(KERN_ERR PRINTK_HEADER));
-
- /* dump the Channel Program */
- /* print first CCWs (maximum 8) */
- act = req->cpaddr;
- for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
- end = min(act + 8, last);
- len = sprintf(page, KERN_ERR PRINTK_HEADER
+ printk("%s", page);
+
+ /* dump the Channel Program (max 140 Bytes per line) */
+ /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
+ first = req->cpaddr;
+ for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
+ to = min(first + 6, last);
+ len = sprintf(page, KERN_ERR PRINTK_HEADER
" Related CP in req: %p\n", req);
- while (act <= end) {
- len += sprintf(page + len, KERN_ERR PRINTK_HEADER
- " CCW %p: %08X %08X DAT:",
- act, ((int *) act)[0], ((int *) act)[1]);
- for (count = 0; count < 32 && count < act->count;
- count += sizeof(int))
- len += sprintf(page + len, " %08X",
- ((int *) (addr_t) act->cda)
- [(count>>2)]);
- len += sprintf(page + len, "\n");
- act++;
- }
- MESSAGE_LOG(KERN_ERR, "%s",
- page + sizeof(KERN_ERR PRINTK_HEADER));
+ dasd_eckd_dump_ccw_range(first, to, page + len);
+ printk("%s", page);
- /* print failing CCW area */
+ /* print failing CCW area (maximum 4) */
+ /* scsw->cda is either valid or zero */
len = 0;
- if (act < ((struct ccw1 *)(addr_t) irb->scsw.cpa) - 2) {
- act = ((struct ccw1 *)(addr_t) irb->scsw.cpa) - 2;
- len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
- }
- end = min((struct ccw1 *)(addr_t) irb->scsw.cpa + 2, last);
- while (act <= end) {
- len += sprintf(page + len, KERN_ERR PRINTK_HEADER
- " CCW %p: %08X %08X DAT:",
- act, ((int *) act)[0], ((int *) act)[1]);
- for (count = 0; count < 32 && count < act->count;
- count += sizeof(int))
- len += sprintf(page + len, " %08X",
- ((int *) (addr_t) act->cda)
- [(count>>2)]);
- len += sprintf(page + len, "\n");
- act++;
+ from = ++to;
+ fail = (struct ccw1 *)(addr_t) irb->scsw.cpa; /* failing CCW */
+ if (from < fail - 2) {
+ from = fail - 2; /* there is a gap - print header */
+ len += sprintf(page, KERN_ERR PRINTK_HEADER "......\n");
}
+ to = min(fail + 1, last);
+ len += dasd_eckd_dump_ccw_range(from, to, page + len);
- /* print last CCWs */
- if (act < last - 2) {
- act = last - 2;
+ /* print last CCWs (maximum 2) */
+ from = max(from, ++to);
+ if (from < last - 1) {
+ from = last - 1; /* there is a gap - print header */
len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
}
- while (act <= last) {
- len += sprintf(page + len, KERN_ERR PRINTK_HEADER
- " CCW %p: %08X %08X DAT:",
- act, ((int *) act)[0], ((int *) act)[1]);
- for (count = 0; count < 32 && count < act->count;
- count += sizeof(int))
- len += sprintf(page + len, " %08X",
- ((int *) (addr_t) act->cda)
- [(count>>2)]);
- len += sprintf(page + len, "\n");
- act++;
- }
+ len += dasd_eckd_dump_ccw_range(from, last, page + len);
if (len > 0)
- MESSAGE_LOG(KERN_ERR, "%s",
- page + sizeof(KERN_ERR PRINTK_HEADER));
+ printk("%s", page);
free_page((unsigned long) page);
}
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