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s390/zcrypt: fix card and queue total counter wrap

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The internal statistic counters for the total number of
requests processed per card and per queue used integers. So they do
wrap after a rather huge amount of crypto requests processed. This
patch introduces uint64 counters which should hold much longer but
still may wrap. The sysfs attributes request_count for card and queue
also used only %ld and now display the counter value with %llu.

This is not a security relevant fix. The int overflow which happened
is not in any way exploitable as a security breach.

Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Harald Freudenberger
2019-12-20 16:02:54 +01:00
committed by Vasily Gorbik
parent aab73d278d
commit fcd98d4002
4 changed files with 18 additions and 16 deletions
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4
drivers/s390/crypto/ap_bus.h
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@@ -162,7 +162,7 @@ struct ap_card {
unsigned int functions; /* AP device function bitfield. */
int queue_depth; /* AP queue depth.*/
int id; /* AP card number. */
atomic_t total_request_count; /* # requests ever for this AP device.*/
atomic64_t total_request_count; /* # requests ever for this AP device.*/
};
#define to_ap_card(x) container_of((x), struct ap_card, ap_dev.device)
@@ -179,7 +179,7 @@ struct ap_queue {
enum ap_state state; /* State of the AP device. */
int pendingq_count; /* # requests on pendingq list. */
int requestq_count; /* # requests on requestq list. */
int total_request_count; /* # requests ever for this AP device.*/
u64 total_request_count; /* # requests ever for this AP device.*/
int request_timeout; /* Request timeout in jiffies. */
struct timer_list timeout; /* Timer for request timeouts. */
struct list_head pendingq; /* List of message sent to AP queue. */