[PATCH 5.13 026/300] s390/zcrypt: fix wrong offset index for APKA master key valid state

Greg Kroah-Hartman
2021-09-13T13:56:44Z

From: Harald Freudenberger <freude@linux.ibm.com>

[ Upstream commit 8617bb74006252cb2286008afe7d6575a6425857 ]

Tests showed a mismatch between what the CCA tool reports about
the APKA master key state and what's displayed by the zcrypt dd
in sysfs. After some investigation, we found out that the
documentation which was the source for the zcrypt dd implementation
lacks the listing of 3 fields. So this patch now moves the
evaluation of the APKA master key state to the correct offset.

Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/s390/crypto/zcrypt_ccamisc.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/s390/crypto/zcrypt_ccamisc.c b/drivers/s390/crypto/zcrypt_ccamisc.c
index d68c0ed5e0dd..f5d0212fb4fe 100644
--- a/drivers/s390/crypto/zcrypt_ccamisc.c
+++ b/drivers/s390/crypto/zcrypt_ccamisc.c
@@ -1724,10 +1724,10 @@ static int fetch_cca_info(u16 cardnr, u16 domain, struct cca_info *ci)
rlen = vlen = PAGE_SIZE/2;
rc = cca_query_crypto_facility(cardnr, domain, "STATICSB",
rarray, &rlen, varray, &vlen);
- if (rc == 0 && rlen >= 10*8 && vlen >= 240) {
- ci->new_apka_mk_state = (char) rarray[7*8];
- ci->cur_apka_mk_state = (char) rarray[8*8];
- ci->old_apka_mk_state = (char) rarray[9*8];
+ if (rc == 0 && rlen >= 13*8 && vlen >= 240) {
+ ci->new_apka_mk_state = (char) rarray[10*8];
+ ci->cur_apka_mk_state = (char) rarray[11*8];
+ ci->old_apka_mk_state = (char) rarray[12*8];
if (ci->old_apka_mk_state == '2')
memcpy(&ci->old_apka_mkvp, varray + 208, 8);
if (ci->cur_apka_mk_state == '2')
--
2.30.2