From 5dabfecad4a0868201af2ffb69dcd3223f9ca630 Mon Sep 17 00:00:00 2001 From: Harald Freudenberger Date: Thu, 8 Feb 2024 10:33:35 +0100 Subject: [PATCH] s390/pkey: improve pkey retry behavior This patch reworks and improves the pkey retry behavior for the pkey_ep11key2pkey() function. In contrast to the pkey_skey2pkey() function which is used to trigger a protected key derivation from an CCA secure data or cipher key the EP11 counterpart function had no proper retry loop implemented. This patch now introduces code which acts similar to the retry already done for CCA keys for this function used for EP11 keys. Signed-off-by: Harald Freudenberger Reviewed-by: Holger Dengler Signed-off-by: Heiko Carstens --- drivers/s390/crypto/pkey_api.c | 39 ++++++++++++++++++---------------- 1 file changed, 21 insertions(+), 18 deletions(-) diff --git a/drivers/s390/crypto/pkey_api.c b/drivers/s390/crypto/pkey_api.c index 4c60b5acbae1..dccf664a3d95 100644 --- a/drivers/s390/crypto/pkey_api.c +++ b/drivers/s390/crypto/pkey_api.c @@ -293,33 +293,36 @@ static int pkey_ep11key2pkey(const u8 *key, size_t keylen, u8 *protkey, u32 *protkeylen, u32 *protkeytype) { u32 nr_apqns, *apqns = NULL; + int i, j, rc = -ENODEV; u16 card, dom; - int i, rc; zcrypt_wait_api_operational(); - /* build a list of apqns suitable for this key */ - rc = ep11_findcard2(&apqns, &nr_apqns, 0xFFFF, 0xFFFF, - ZCRYPT_CEX7, - ap_is_se_guest() ? EP11_API_V6 : EP11_API_V4, - ep11_kb_wkvp(key, keylen)); - if (rc) - goto out; + /* try two times in case of failure */ + for (i = 0; i < 2 && rc; i++) { - /* go through the list of apqns and try to derive an pkey */ - for (rc = -ENODEV, i = 0; i < nr_apqns; i++) { - card = apqns[i] >> 16; - dom = apqns[i] & 0xFFFF; - rc = ep11_kblob2protkey(card, dom, key, keylen, - protkey, protkeylen, protkeytype); - if (rc == 0) - break; + /* build a list of apqns suitable for this key */ + rc = ep11_findcard2(&apqns, &nr_apqns, 0xFFFF, 0xFFFF, + ZCRYPT_CEX7, + ap_is_se_guest() ? EP11_API_V6 : EP11_API_V4, + ep11_kb_wkvp(key, keylen)); + if (rc) + continue; /* retry findcard on failure */ + + /* go through the list of apqns and try to derive an pkey */ + for (rc = -ENODEV, j = 0; j < nr_apqns && rc; j++) { + card = apqns[j] >> 16; + dom = apqns[j] & 0xFFFF; + rc = ep11_kblob2protkey(card, dom, key, keylen, + protkey, protkeylen, protkeytype); + } + + kfree(apqns); } -out: - kfree(apqns); if (rc) pr_debug("%s failed rc=%d\n", __func__, rc); + return rc; } -- 2.49.0