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authorHarald Freudenberger <freude@linux.vnet.ibm.com>2014-12-10 10:23:59 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2014-12-18 09:55:55 +0100
commit099eae11a8beb13e17f6b9371c7c090c61bc061d (patch)
treec04f74a8b1f3b35c489bbcdccdb56bbfb4f98b24 /drivers/s390
parent44e8967d591686463e84a88b46b03beba3ab49fb (diff)
downloadlinux-099eae11a8beb13e17f6b9371c7c090c61bc061d.tar.bz2
s390/zcrypt: kernel oops at insmod of the z90crypt device driver
Kernel oops caused by invalid parameter at TAPQ instruction: On older systems where the QCI instruction is not available all possible domains are probed via TAPQ instruction. The range for the probe has been extended with the > 16 domain support now leading to a possible specification exception when this instruction is called for probing higher values within the new range. This may happen during insmod and/or ap bus reset only on machines without a QCI instruction (z10, z196, z114), zEC12 and newer systems are not affected. The fix modifies the domain checking function to limit the allowed range if no QCI info is available. Signed-off-by: Harald Freudenberger <freude@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390')
-rw-r--r--drivers/s390/crypto/ap_bus.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/s390/crypto/ap_bus.c b/drivers/s390/crypto/ap_bus.c
index 91e97ec01418..4d41bf75c233 100644
--- a/drivers/s390/crypto/ap_bus.c
+++ b/drivers/s390/crypto/ap_bus.c
@@ -1163,9 +1163,13 @@ static inline int ap_test_config_card_id(unsigned int id)
*/
static inline int ap_test_config_domain(unsigned int domain)
{
- if (!ap_configuration)
- return 1;
- return ap_test_config(ap_configuration->aqm, domain);
+ if (!ap_configuration) /* QCI not supported */
+ if (domain < 16)
+ return 1; /* then domains 0...15 are configured */
+ else
+ return 0;
+ else
+ return ap_test_config(ap_configuration->aqm, domain);
}
/**