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Diffstat (limited to 'arch/s390/crypto/paes_s390.c')
-rw-r--r--arch/s390/crypto/paes_s390.c286
1 files changed, 198 insertions, 88 deletions
diff --git a/arch/s390/crypto/paes_s390.c b/arch/s390/crypto/paes_s390.c
index c7119c617b6e..55ee5567a5ea 100644
--- a/arch/s390/crypto/paes_s390.c
+++ b/arch/s390/crypto/paes_s390.c
@@ -5,7 +5,7 @@
* s390 implementation of the AES Cipher Algorithm with protected keys.
*
* s390 Version:
- * Copyright IBM Corp. 2017,2019
+ * Copyright IBM Corp. 2017, 2023
* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
* Harald Freudenberger <freude@de.ibm.com>
*/
@@ -20,7 +20,9 @@
#include <linux/module.h>
#include <linux/cpufeature.h>
#include <linux/init.h>
+#include <linux/mutex.h>
#include <linux/spinlock.h>
+#include <linux/delay.h>
#include <crypto/internal/skcipher.h>
#include <crypto/xts.h>
#include <asm/cpacf.h>
@@ -32,11 +34,11 @@
* is called. As paes can handle different kinds of key blobs
* and padding is also possible, the limits need to be generous.
*/
-#define PAES_MIN_KEYSIZE 64
-#define PAES_MAX_KEYSIZE 256
+#define PAES_MIN_KEYSIZE 16
+#define PAES_MAX_KEYSIZE MAXEP11AESKEYBLOBSIZE
static u8 *ctrblk;
-static DEFINE_SPINLOCK(ctrblk_lock);
+static DEFINE_MUTEX(ctrblk_lock);
static cpacf_mask_t km_functions, kmc_functions, kmctr_functions;
@@ -53,19 +55,46 @@ struct key_blob {
unsigned int keylen;
};
-static inline int _copy_key_to_kb(struct key_blob *kb,
- const u8 *key,
- unsigned int keylen)
-{
- if (keylen <= sizeof(kb->keybuf))
+static inline int _key_to_kb(struct key_blob *kb,
+ const u8 *key,
+ unsigned int keylen)
+{
+ struct clearkey_header {
+ u8 type;
+ u8 res0[3];
+ u8 version;
+ u8 res1[3];
+ u32 keytype;
+ u32 len;
+ } __packed * h;
+
+ switch (keylen) {
+ case 16:
+ case 24:
+ case 32:
+ /* clear key value, prepare pkey clear key token in keybuf */
+ memset(kb->keybuf, 0, sizeof(kb->keybuf));
+ h = (struct clearkey_header *) kb->keybuf;
+ h->version = 0x02; /* TOKVER_CLEAR_KEY */
+ h->keytype = (keylen - 8) >> 3;
+ h->len = keylen;
+ memcpy(kb->keybuf + sizeof(*h), key, keylen);
+ kb->keylen = sizeof(*h) + keylen;
kb->key = kb->keybuf;
- else {
- kb->key = kmalloc(keylen, GFP_KERNEL);
- if (!kb->key)
- return -ENOMEM;
+ break;
+ default:
+ /* other key material, let pkey handle this */
+ if (keylen <= sizeof(kb->keybuf))
+ kb->key = kb->keybuf;
+ else {
+ kb->key = kmalloc(keylen, GFP_KERNEL);
+ if (!kb->key)
+ return -ENOMEM;
+ }
+ memcpy(kb->key, key, keylen);
+ kb->keylen = keylen;
+ break;
}
- memcpy(kb->key, key, keylen);
- kb->keylen = keylen;
return 0;
}
@@ -74,7 +103,7 @@ static inline void _free_kb_keybuf(struct key_blob *kb)
{
if (kb->key && kb->key != kb->keybuf
&& kb->keylen > sizeof(kb->keybuf)) {
- kfree(kb->key);
+ kfree_sensitive(kb->key);
kb->key = NULL;
}
}
@@ -82,23 +111,29 @@ static inline void _free_kb_keybuf(struct key_blob *kb)
struct s390_paes_ctx {
struct key_blob kb;
struct pkey_protkey pk;
+ spinlock_t pk_lock;
unsigned long fc;
};
struct s390_pxts_ctx {
struct key_blob kb[2];
struct pkey_protkey pk[2];
+ spinlock_t pk_lock;
unsigned long fc;
};
-static inline int __paes_convert_key(struct key_blob *kb,
+static inline int __paes_keyblob2pkey(struct key_blob *kb,
struct pkey_protkey *pk)
{
int i, ret;
/* try three times in case of failure */
for (i = 0; i < 3; i++) {
- ret = pkey_keyblob2pkey(kb->key, kb->keylen, pk);
+ if (i > 0 && ret == -EAGAIN && in_task())
+ if (msleep_interruptible(1000))
+ return -EINTR;
+ ret = pkey_keyblob2pkey(kb->key, kb->keylen,
+ pk->protkey, &pk->len, &pk->type);
if (ret == 0)
break;
}
@@ -106,22 +141,21 @@ static inline int __paes_convert_key(struct key_blob *kb,
return ret;
}
-static int __paes_set_key(struct s390_paes_ctx *ctx)
+static inline int __paes_convert_key(struct s390_paes_ctx *ctx)
{
- unsigned long fc;
-
- if (__paes_convert_key(&ctx->kb, &ctx->pk))
- return -EINVAL;
+ int ret;
+ struct pkey_protkey pkey;
- /* Pick the correct function code based on the protected key type */
- fc = (ctx->pk.type == PKEY_KEYTYPE_AES_128) ? CPACF_KM_PAES_128 :
- (ctx->pk.type == PKEY_KEYTYPE_AES_192) ? CPACF_KM_PAES_192 :
- (ctx->pk.type == PKEY_KEYTYPE_AES_256) ? CPACF_KM_PAES_256 : 0;
+ pkey.len = sizeof(pkey.protkey);
+ ret = __paes_keyblob2pkey(&ctx->kb, &pkey);
+ if (ret)
+ return ret;
- /* Check if the function code is available */
- ctx->fc = (fc && cpacf_test_func(&km_functions, fc)) ? fc : 0;
+ spin_lock_bh(&ctx->pk_lock);
+ memcpy(&ctx->pk, &pkey, sizeof(pkey));
+ spin_unlock_bh(&ctx->pk_lock);
- return ctx->fc ? 0 : -EINVAL;
+ return 0;
}
static int ecb_paes_init(struct crypto_skcipher *tfm)
@@ -129,6 +163,7 @@ static int ecb_paes_init(struct crypto_skcipher *tfm)
struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
ctx->kb.key = NULL;
+ spin_lock_init(&ctx->pk_lock);
return 0;
}
@@ -140,6 +175,26 @@ static void ecb_paes_exit(struct crypto_skcipher *tfm)
_free_kb_keybuf(&ctx->kb);
}
+static inline int __ecb_paes_set_key(struct s390_paes_ctx *ctx)
+{
+ int rc;
+ unsigned long fc;
+
+ rc = __paes_convert_key(ctx);
+ if (rc)
+ return rc;
+
+ /* Pick the correct function code based on the protected key type */
+ fc = (ctx->pk.type == PKEY_KEYTYPE_AES_128) ? CPACF_KM_PAES_128 :
+ (ctx->pk.type == PKEY_KEYTYPE_AES_192) ? CPACF_KM_PAES_192 :
+ (ctx->pk.type == PKEY_KEYTYPE_AES_256) ? CPACF_KM_PAES_256 : 0;
+
+ /* Check if the function code is available */
+ ctx->fc = (fc && cpacf_test_func(&km_functions, fc)) ? fc : 0;
+
+ return ctx->fc ? 0 : -EINVAL;
+}
+
static int ecb_paes_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
unsigned int key_len)
{
@@ -147,15 +202,11 @@ static int ecb_paes_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
_free_kb_keybuf(&ctx->kb);
- rc = _copy_key_to_kb(&ctx->kb, in_key, key_len);
+ rc = _key_to_kb(&ctx->kb, in_key, key_len);
if (rc)
return rc;
- if (__paes_set_key(ctx)) {
- crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
- return -EINVAL;
- }
- return 0;
+ return __ecb_paes_set_key(ctx);
}
static int ecb_paes_crypt(struct skcipher_request *req, unsigned long modifier)
@@ -165,18 +216,31 @@ static int ecb_paes_crypt(struct skcipher_request *req, unsigned long modifier)
struct skcipher_walk walk;
unsigned int nbytes, n, k;
int ret;
+ struct {
+ u8 key[MAXPROTKEYSIZE];
+ } param;
ret = skcipher_walk_virt(&walk, req, false);
+ if (ret)
+ return ret;
+
+ spin_lock_bh(&ctx->pk_lock);
+ memcpy(param.key, ctx->pk.protkey, MAXPROTKEYSIZE);
+ spin_unlock_bh(&ctx->pk_lock);
+
while ((nbytes = walk.nbytes) != 0) {
/* only use complete blocks */
n = nbytes & ~(AES_BLOCK_SIZE - 1);
- k = cpacf_km(ctx->fc | modifier, ctx->pk.protkey,
+ k = cpacf_km(ctx->fc | modifier, &param,
walk.dst.virt.addr, walk.src.virt.addr, n);
if (k)
ret = skcipher_walk_done(&walk, nbytes - k);
if (k < n) {
- if (__paes_set_key(ctx) != 0)
+ if (__paes_convert_key(ctx))
return skcipher_walk_done(&walk, -EIO);
+ spin_lock_bh(&ctx->pk_lock);
+ memcpy(param.key, ctx->pk.protkey, MAXPROTKEYSIZE);
+ spin_unlock_bh(&ctx->pk_lock);
}
}
return ret;
@@ -214,6 +278,7 @@ static int cbc_paes_init(struct crypto_skcipher *tfm)
struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
ctx->kb.key = NULL;
+ spin_lock_init(&ctx->pk_lock);
return 0;
}
@@ -225,12 +290,14 @@ static void cbc_paes_exit(struct crypto_skcipher *tfm)
_free_kb_keybuf(&ctx->kb);
}
-static int __cbc_paes_set_key(struct s390_paes_ctx *ctx)
+static inline int __cbc_paes_set_key(struct s390_paes_ctx *ctx)
{
+ int rc;
unsigned long fc;
- if (__paes_convert_key(&ctx->kb, &ctx->pk))
- return -EINVAL;
+ rc = __paes_convert_key(ctx);
+ if (rc)
+ return rc;
/* Pick the correct function code based on the protected key type */
fc = (ctx->pk.type == PKEY_KEYTYPE_AES_128) ? CPACF_KMC_PAES_128 :
@@ -250,15 +317,11 @@ static int cbc_paes_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
_free_kb_keybuf(&ctx->kb);
- rc = _copy_key_to_kb(&ctx->kb, in_key, key_len);
+ rc = _key_to_kb(&ctx->kb, in_key, key_len);
if (rc)
return rc;
- if (__cbc_paes_set_key(ctx)) {
- crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
- return -EINVAL;
- }
- return 0;
+ return __cbc_paes_set_key(ctx);
}
static int cbc_paes_crypt(struct skcipher_request *req, unsigned long modifier)
@@ -276,8 +339,12 @@ static int cbc_paes_crypt(struct skcipher_request *req, unsigned long modifier)
ret = skcipher_walk_virt(&walk, req, false);
if (ret)
return ret;
+
memcpy(param.iv, walk.iv, AES_BLOCK_SIZE);
+ spin_lock_bh(&ctx->pk_lock);
memcpy(param.key, ctx->pk.protkey, MAXPROTKEYSIZE);
+ spin_unlock_bh(&ctx->pk_lock);
+
while ((nbytes = walk.nbytes) != 0) {
/* only use complete blocks */
n = nbytes & ~(AES_BLOCK_SIZE - 1);
@@ -288,9 +355,11 @@ static int cbc_paes_crypt(struct skcipher_request *req, unsigned long modifier)
ret = skcipher_walk_done(&walk, nbytes - k);
}
if (k < n) {
- if (__cbc_paes_set_key(ctx) != 0)
+ if (__paes_convert_key(ctx))
return skcipher_walk_done(&walk, -EIO);
+ spin_lock_bh(&ctx->pk_lock);
memcpy(param.key, ctx->pk.protkey, MAXPROTKEYSIZE);
+ spin_unlock_bh(&ctx->pk_lock);
}
}
return ret;
@@ -330,6 +399,7 @@ static int xts_paes_init(struct crypto_skcipher *tfm)
ctx->kb[0].key = NULL;
ctx->kb[1].key = NULL;
+ spin_lock_init(&ctx->pk_lock);
return 0;
}
@@ -342,12 +412,30 @@ static void xts_paes_exit(struct crypto_skcipher *tfm)
_free_kb_keybuf(&ctx->kb[1]);
}
-static int __xts_paes_set_key(struct s390_pxts_ctx *ctx)
+static inline int __xts_paes_convert_key(struct s390_pxts_ctx *ctx)
+{
+ struct pkey_protkey pkey0, pkey1;
+
+ pkey0.len = sizeof(pkey0.protkey);
+ pkey1.len = sizeof(pkey1.protkey);
+
+ if (__paes_keyblob2pkey(&ctx->kb[0], &pkey0) ||
+ __paes_keyblob2pkey(&ctx->kb[1], &pkey1))
+ return -EINVAL;
+
+ spin_lock_bh(&ctx->pk_lock);
+ memcpy(&ctx->pk[0], &pkey0, sizeof(pkey0));
+ memcpy(&ctx->pk[1], &pkey1, sizeof(pkey1));
+ spin_unlock_bh(&ctx->pk_lock);
+
+ return 0;
+}
+
+static inline int __xts_paes_set_key(struct s390_pxts_ctx *ctx)
{
unsigned long fc;
- if (__paes_convert_key(&ctx->kb[0], &ctx->pk[0]) ||
- __paes_convert_key(&ctx->kb[1], &ctx->pk[1]))
+ if (__xts_paes_convert_key(ctx))
return -EINVAL;
if (ctx->pk[0].type != ctx->pk[1].type)
@@ -379,20 +467,19 @@ static int xts_paes_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
_free_kb_keybuf(&ctx->kb[0]);
_free_kb_keybuf(&ctx->kb[1]);
- rc = _copy_key_to_kb(&ctx->kb[0], in_key, key_len);
+ rc = _key_to_kb(&ctx->kb[0], in_key, key_len);
if (rc)
return rc;
- rc = _copy_key_to_kb(&ctx->kb[1], in_key + key_len, key_len);
+ rc = _key_to_kb(&ctx->kb[1], in_key + key_len, key_len);
if (rc)
return rc;
- if (__xts_paes_set_key(ctx)) {
- crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
- return -EINVAL;
- }
+ rc = __xts_paes_set_key(ctx);
+ if (rc)
+ return rc;
/*
- * xts_check_key verifies the key length is not odd and makes
+ * xts_verify_key verifies the key length is not odd and makes
* sure that the two keys are not the same. This can be done
* on the two protected keys as well
*/
@@ -425,15 +512,17 @@ static int xts_paes_crypt(struct skcipher_request *req, unsigned long modifier)
ret = skcipher_walk_virt(&walk, req, false);
if (ret)
return ret;
+
keylen = (ctx->pk[0].type == PKEY_KEYTYPE_AES_128) ? 48 : 64;
offset = (ctx->pk[0].type == PKEY_KEYTYPE_AES_128) ? 16 : 0;
-retry:
+
memset(&pcc_param, 0, sizeof(pcc_param));
memcpy(pcc_param.tweak, walk.iv, sizeof(pcc_param.tweak));
+ spin_lock_bh(&ctx->pk_lock);
memcpy(pcc_param.key + offset, ctx->pk[1].protkey, keylen);
- cpacf_pcc(ctx->fc, pcc_param.key + offset);
-
memcpy(xts_param.key + offset, ctx->pk[0].protkey, keylen);
+ spin_unlock_bh(&ctx->pk_lock);
+ cpacf_pcc(ctx->fc, pcc_param.key + offset);
memcpy(xts_param.init, pcc_param.xts, 16);
while ((nbytes = walk.nbytes) != 0) {
@@ -444,11 +533,15 @@ retry:
if (k)
ret = skcipher_walk_done(&walk, nbytes - k);
if (k < n) {
- if (__xts_paes_set_key(ctx) != 0)
+ if (__xts_paes_convert_key(ctx))
return skcipher_walk_done(&walk, -EIO);
- goto retry;
+ spin_lock_bh(&ctx->pk_lock);
+ memcpy(xts_param.key + offset,
+ ctx->pk[0].protkey, keylen);
+ spin_unlock_bh(&ctx->pk_lock);
}
}
+
return ret;
}
@@ -485,6 +578,7 @@ static int ctr_paes_init(struct crypto_skcipher *tfm)
struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
ctx->kb.key = NULL;
+ spin_lock_init(&ctx->pk_lock);
return 0;
}
@@ -496,12 +590,14 @@ static void ctr_paes_exit(struct crypto_skcipher *tfm)
_free_kb_keybuf(&ctx->kb);
}
-static int __ctr_paes_set_key(struct s390_paes_ctx *ctx)
+static inline int __ctr_paes_set_key(struct s390_paes_ctx *ctx)
{
+ int rc;
unsigned long fc;
- if (__paes_convert_key(&ctx->kb, &ctx->pk))
- return -EINVAL;
+ rc = __paes_convert_key(ctx);
+ if (rc)
+ return rc;
/* Pick the correct function code based on the protected key type */
fc = (ctx->pk.type == PKEY_KEYTYPE_AES_128) ? CPACF_KMCTR_PAES_128 :
@@ -522,15 +618,11 @@ static int ctr_paes_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
_free_kb_keybuf(&ctx->kb);
- rc = _copy_key_to_kb(&ctx->kb, in_key, key_len);
+ rc = _key_to_kb(&ctx->kb, in_key, key_len);
if (rc)
return rc;
- if (__ctr_paes_set_key(ctx)) {
- crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
- return -EINVAL;
- }
- return 0;
+ return __ctr_paes_set_key(ctx);
}
static unsigned int __ctrblk_init(u8 *ctrptr, u8 *iv, unsigned int nbytes)
@@ -556,49 +648,67 @@ static int ctr_paes_crypt(struct skcipher_request *req)
struct skcipher_walk walk;
unsigned int nbytes, n, k;
int ret, locked;
-
- locked = spin_trylock(&ctrblk_lock);
+ struct {
+ u8 key[MAXPROTKEYSIZE];
+ } param;
ret = skcipher_walk_virt(&walk, req, false);
+ if (ret)
+ return ret;
+
+ spin_lock_bh(&ctx->pk_lock);
+ memcpy(param.key, ctx->pk.protkey, MAXPROTKEYSIZE);
+ spin_unlock_bh(&ctx->pk_lock);
+
+ locked = mutex_trylock(&ctrblk_lock);
+
while ((nbytes = walk.nbytes) >= AES_BLOCK_SIZE) {
n = AES_BLOCK_SIZE;
if (nbytes >= 2*AES_BLOCK_SIZE && locked)
n = __ctrblk_init(ctrblk, walk.iv, nbytes);
ctrptr = (n > AES_BLOCK_SIZE) ? ctrblk : walk.iv;
- k = cpacf_kmctr(ctx->fc, ctx->pk.protkey, walk.dst.virt.addr,
+ k = cpacf_kmctr(ctx->fc, &param, walk.dst.virt.addr,
walk.src.virt.addr, n, ctrptr);
if (k) {
if (ctrptr == ctrblk)
memcpy(walk.iv, ctrptr + k - AES_BLOCK_SIZE,
AES_BLOCK_SIZE);
crypto_inc(walk.iv, AES_BLOCK_SIZE);
- ret = skcipher_walk_done(&walk, nbytes - n);
+ ret = skcipher_walk_done(&walk, nbytes - k);
}
if (k < n) {
- if (__ctr_paes_set_key(ctx) != 0) {
+ if (__paes_convert_key(ctx)) {
if (locked)
- spin_unlock(&ctrblk_lock);
+ mutex_unlock(&ctrblk_lock);
return skcipher_walk_done(&walk, -EIO);
}
+ spin_lock_bh(&ctx->pk_lock);
+ memcpy(param.key, ctx->pk.protkey, MAXPROTKEYSIZE);
+ spin_unlock_bh(&ctx->pk_lock);
}
}
if (locked)
- spin_unlock(&ctrblk_lock);
+ mutex_unlock(&ctrblk_lock);
/*
* final block may be < AES_BLOCK_SIZE, copy only nbytes
*/
if (nbytes) {
+ memset(buf, 0, AES_BLOCK_SIZE);
+ memcpy(buf, walk.src.virt.addr, nbytes);
while (1) {
- if (cpacf_kmctr(ctx->fc, ctx->pk.protkey, buf,
- walk.src.virt.addr, AES_BLOCK_SIZE,
+ if (cpacf_kmctr(ctx->fc, &param, buf,
+ buf, AES_BLOCK_SIZE,
walk.iv) == AES_BLOCK_SIZE)
break;
- if (__ctr_paes_set_key(ctx) != 0)
+ if (__paes_convert_key(ctx))
return skcipher_walk_done(&walk, -EIO);
+ spin_lock_bh(&ctx->pk_lock);
+ memcpy(param.key, ctx->pk.protkey, MAXPROTKEYSIZE);
+ spin_unlock_bh(&ctx->pk_lock);
}
memcpy(walk.dst.virt.addr, buf, nbytes);
crypto_inc(walk.iv, AES_BLOCK_SIZE);
- ret = skcipher_walk_done(&walk, 0);
+ ret = skcipher_walk_done(&walk, nbytes);
}
return ret;
@@ -631,12 +741,12 @@ static inline void __crypto_unregister_skcipher(struct skcipher_alg *alg)
static void paes_s390_fini(void)
{
- if (ctrblk)
- free_page((unsigned long) ctrblk);
__crypto_unregister_skcipher(&ctr_paes_alg);
__crypto_unregister_skcipher(&xts_paes_alg);
__crypto_unregister_skcipher(&cbc_paes_alg);
__crypto_unregister_skcipher(&ecb_paes_alg);
+ if (ctrblk)
+ free_page((unsigned long) ctrblk);
}
static int __init paes_s390_init(void)
@@ -674,14 +784,14 @@ static int __init paes_s390_init(void)
if (cpacf_test_func(&kmctr_functions, CPACF_KMCTR_PAES_128) ||
cpacf_test_func(&kmctr_functions, CPACF_KMCTR_PAES_192) ||
cpacf_test_func(&kmctr_functions, CPACF_KMCTR_PAES_256)) {
- ret = crypto_register_skcipher(&ctr_paes_alg);
- if (ret)
- goto out_err;
ctrblk = (u8 *) __get_free_page(GFP_KERNEL);
if (!ctrblk) {
ret = -ENOMEM;
goto out_err;
}
+ ret = crypto_register_skcipher(&ctr_paes_alg);
+ if (ret)
+ goto out_err;
}
return 0;
generated by cgit (git 2.34.1) at 2024-04-19 10:45:31 +0000