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Wed, 9 Apr 2025 14:03:15 +0000 (GMT) From: Harald Freudenberger To: dengler@linux.ibm.com, ifranzki@linux.ibm.com, fcallies@linux.ibm.com, hca@linux.ibm.com, gor@linux.ibm.com, agordeev@linux.ibm.com, seiden@linux.ibm.com, borntraeger@linux.ibm.com, frankja@linux.ibm.com, imbrenda@linux.ibm.com Cc: linux-s390@vger.kernel.org, herbert@gondor.apana.org.au Subject: [PATCH v4 14/24] s390/zcrypt/pkey: Rework ep11 findcard() implementation and callers Date: Wed, 9 Apr 2025 16:02:55 +0200 Message-ID: <20250409140305.58900-15-freude@linux.ibm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250409140305.58900-1-freude@linux.ibm.com> References: <20250409140305.58900-1-freude@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: C5QmKbxlrNAaiMfZ28u7A9ByVxxbIG5W X-Proofpoint-GUID: C5QmKbxlrNAaiMfZ28u7A9ByVxxbIG5W X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1095,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-04-09_05,2025-04-08_04,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 bulkscore=0 spamscore=0 impostorscore=0 lowpriorityscore=0 priorityscore=1501 clxscore=1015 malwarescore=0 mlxscore=0 suspectscore=0 mlxlogscore=999 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2502280000 definitions=main-2504090086 Rework the memory usage of the ep11 findcard() implementation: - findcard does not allocate memory for the list of apqns any more. - the callers are now responsible to provide an array of apqns to store the matching apqns into. Signed-off-by: Harald Freudenberger --- drivers/s390/crypto/pkey_ep11.c | 19 +++++++--------- drivers/s390/crypto/zcrypt_ep11misc.c | 31 ++++++--------------------- drivers/s390/crypto/zcrypt_ep11misc.h | 12 +++++------ 3 files changed, 20 insertions(+), 42 deletions(-) diff --git a/drivers/s390/crypto/pkey_ep11.c b/drivers/s390/crypto/pkey_ep11.c index 5b033ca3e828..b970f0be84be 100644 --- a/drivers/s390/crypto/pkey_ep11.c +++ b/drivers/s390/crypto/pkey_ep11.c @@ -73,7 +73,7 @@ static int ep11_apqns4key(const u8 *key, u32 keylen, u32 flags, struct pkey_apqn *apqns, size_t *nr_apqns) { struct keytoken_header *hdr = (struct keytoken_header *)key; - u32 _nr_apqns, *_apqns = NULL; + u32 _apqns[MAXAPQNSINLIST], _nr_apqns = ARRAY_SIZE(_apqns); int rc; if (!flags) @@ -98,7 +98,7 @@ static int ep11_apqns4key(const u8 *key, u32 keylen, u32 flags, minhwtype = ZCRYPT_CEX7; api = ap_is_se_guest() ? EP11_API_V6 : EP11_API_V4; } - rc = ep11_findcard2(&_apqns, &_nr_apqns, 0xFFFF, 0xFFFF, + rc = ep11_findcard2(_apqns, &_nr_apqns, 0xFFFF, 0xFFFF, minhwtype, api, kb->wkvp); if (rc) goto out; @@ -115,7 +115,7 @@ static int ep11_apqns4key(const u8 *key, u32 keylen, u32 flags, minhwtype = ZCRYPT_CEX7; api = ap_is_se_guest() ? EP11_API_V6 : EP11_API_V4; } - rc = ep11_findcard2(&_apqns, &_nr_apqns, 0xFFFF, 0xFFFF, + rc = ep11_findcard2(_apqns, &_nr_apqns, 0xFFFF, 0xFFFF, minhwtype, api, kb->wkvp); if (rc) goto out; @@ -135,7 +135,6 @@ static int ep11_apqns4key(const u8 *key, u32 keylen, u32 flags, *nr_apqns = _nr_apqns; out: - kfree(_apqns); pr_debug("rc=%d\n", rc); return rc; } @@ -144,7 +143,7 @@ static int ep11_apqns4type(enum pkey_key_type ktype, u8 cur_mkvp[32], u8 alt_mkvp[32], u32 flags, struct pkey_apqn *apqns, size_t *nr_apqns) { - u32 _nr_apqns, *_apqns = NULL; + u32 _apqns[MAXAPQNSINLIST], _nr_apqns = ARRAY_SIZE(_apqns); int rc; zcrypt_wait_api_operational(); @@ -158,7 +157,7 @@ static int ep11_apqns4type(enum pkey_key_type ktype, if (flags & PKEY_FLAGS_MATCH_CUR_MKVP) wkvp = cur_mkvp; api = ap_is_se_guest() ? EP11_API_V6 : EP11_API_V4; - rc = ep11_findcard2(&_apqns, &_nr_apqns, 0xFFFF, 0xFFFF, + rc = ep11_findcard2(_apqns, &_nr_apqns, 0xFFFF, 0xFFFF, ZCRYPT_CEX7, api, wkvp); if (rc) goto out; @@ -178,7 +177,6 @@ static int ep11_apqns4type(enum pkey_key_type ktype, *nr_apqns = _nr_apqns; out: - kfree(_apqns); pr_debug("rc=%d\n", rc); return rc; } @@ -423,7 +421,7 @@ static int ep11_verifykey(const u8 *key, u32 keylen, u32 *keytype, u32 *keybitsize, u32 *flags) { struct keytoken_header *hdr = (struct keytoken_header *)key; - u32 nr_apqns, *apqns = NULL; + u32 apqns[MAXAPQNSINLIST], nr_apqns = ARRAY_SIZE(apqns); int rc; if (keylen < sizeof(*hdr)) @@ -443,7 +441,7 @@ static int ep11_verifykey(const u8 *key, u32 keylen, *keybitsize = kb->head.bitlen; api = ap_is_se_guest() ? EP11_API_V6 : EP11_API_V4; - rc = ep11_findcard2(&apqns, &nr_apqns, *card, *dom, + rc = ep11_findcard2(apqns, &nr_apqns, *card, *dom, ZCRYPT_CEX7, api, ep11_kb_wkvp(key, keylen)); if (rc) @@ -467,7 +465,7 @@ static int ep11_verifykey(const u8 *key, u32 keylen, *keybitsize = kh->bitlen; api = ap_is_se_guest() ? EP11_API_V6 : EP11_API_V4; - rc = ep11_findcard2(&apqns, &nr_apqns, *card, *dom, + rc = ep11_findcard2(apqns, &nr_apqns, *card, *dom, ZCRYPT_CEX7, api, ep11_kb_wkvp(key, keylen)); if (rc) @@ -484,7 +482,6 @@ static int ep11_verifykey(const u8 *key, u32 keylen, } out: - kfree(apqns); pr_debug("rc=%d\n", rc); return rc; } diff --git a/drivers/s390/crypto/zcrypt_ep11misc.c b/drivers/s390/crypto/zcrypt_ep11misc.c index b545fbb3ca7d..1c9250a4e7f2 100644 --- a/drivers/s390/crypto/zcrypt_ep11misc.c +++ b/drivers/s390/crypto/zcrypt_ep11misc.c @@ -1523,14 +1523,14 @@ int ep11_kblob2protkey(u16 card, u16 dom, } EXPORT_SYMBOL(ep11_kblob2protkey); -int ep11_findcard2(u32 **apqns, u32 *nr_apqns, u16 cardnr, u16 domain, +int ep11_findcard2(u32 *apqns, u32 *nr_apqns, u16 cardnr, u16 domain, int minhwtype, int minapi, const u8 *wkvp) { struct zcrypt_device_status_ext *device_status; - u32 *_apqns = NULL, _nr_apqns = 0; - int i, card, dom, rc; struct ep11_domain_info edi; struct ep11_card_info eci; + u32 _nr_apqns = 0; + int i, card, dom; /* occupy the device status memory */ mutex_lock(&dev_status_mem_mutex); @@ -1542,13 +1542,6 @@ int ep11_findcard2(u32 **apqns, u32 *nr_apqns, u16 cardnr, u16 domain, ZCRYPT_DEV_STATUS_CARD_MAX, ZCRYPT_DEV_STATUS_QUEUE_MAX); - /* allocate 1k space for up to 256 apqns */ - _apqns = kmalloc_array(256, sizeof(u32), GFP_KERNEL); - if (!_apqns) { - rc = -ENOMEM; - goto out; - } - /* walk through all the crypto apqnss */ for (i = 0; i < ZCRYPT_DEV_STATUS_ENTRIES; i++) { card = AP_QID_CARD(device_status[i].qid); @@ -1585,25 +1578,15 @@ int ep11_findcard2(u32 **apqns, u32 *nr_apqns, u16 cardnr, u16 domain, continue; } /* apqn passed all filtering criterons, add to the array */ - if (_nr_apqns < 256) - _apqns[_nr_apqns++] = (((u16)card) << 16) | ((u16)dom); + if (_nr_apqns < *nr_apqns) + apqns[_nr_apqns++] = (((u16)card) << 16) | ((u16)dom); } - /* nothing found ? */ - if (!_nr_apqns) { - kfree(_apqns); - rc = -ENODEV; - } else { - /* no re-allocation, simple return the _apqns array */ - *apqns = _apqns; - *nr_apqns = _nr_apqns; - rc = 0; - } + *nr_apqns = _nr_apqns; -out: mutex_unlock(&dev_status_mem_mutex); - return rc; + return _nr_apqns ? 0 : -ENODEV; } EXPORT_SYMBOL(ep11_findcard2); diff --git a/drivers/s390/crypto/zcrypt_ep11misc.h b/drivers/s390/crypto/zcrypt_ep11misc.h index dc1e418a6db1..2abd77aa16cf 100644 --- a/drivers/s390/crypto/zcrypt_ep11misc.h +++ b/drivers/s390/crypto/zcrypt_ep11misc.h @@ -136,14 +136,12 @@ int ep11_clr2keyblob(u16 cardnr, u16 domain, u32 keybitsize, u32 keygenflags, * key for this domain. When a wkvp is given there will always be a re-fetch * of the domain info for the potential apqn - so this triggers an request * reply to each apqn eligible. - * The array of apqn entries is allocated with kmalloc and returned in *apqns; - * the number of apqns stored into the list is returned in *nr_apqns. One apqn - * entry is simple a 32 bit value with 16 bit cardnr and 16 bit domain nr and - * may be casted to struct pkey_apqn. The return value is either 0 for success - * or a negative errno value. If no apqn meeting the criteria is found, - * -ENODEV is returned. + * The caller should set *nr_apqns to the nr of elements available in *apqns. + * On return *nr_apqns is then updated with the nr of apqns filled into *apqns. + * The return value is either 0 for success or a negative errno value. + * If no apqn meeting the criteria is found, -ENODEV is returned. */ -int ep11_findcard2(u32 **apqns, u32 *nr_apqns, u16 cardnr, u16 domain, +int ep11_findcard2(u32 *apqns, u32 *nr_apqns, u16 cardnr, u16 domain, int minhwtype, int minapi, const u8 *wkvp); /* -- 2.43.0