s390/crypto: Don't panic after crypto instruction failures
Remove the BUG_ON's that check for failure or incomplete
results of the s390 hardware crypto instructions.
Rather report the errors as -EIO to the crypto layer.
Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/crypto/aes_s390.c b/arch/s390/crypto/aes_s390.c
index da3c1a7..b4dbade 100644
--- a/arch/s390/crypto/aes_s390.c
+++ b/arch/s390/crypto/aes_s390.c
@@ -325,7 +325,8 @@
u8 *in = walk->src.virt.addr;
ret = crypt_s390_km(func, param, out, in, n);
- BUG_ON((ret < 0) || (ret != n));
+ if (ret < 0 || ret != n)
+ return -EIO;
nbytes &= AES_BLOCK_SIZE - 1;
ret = blkcipher_walk_done(desc, walk, nbytes);
@@ -457,7 +458,8 @@
u8 *in = walk->src.virt.addr;
ret = crypt_s390_kmc(func, param, out, in, n);
- BUG_ON((ret < 0) || (ret != n));
+ if (ret < 0 || ret != n)
+ return -EIO;
nbytes &= AES_BLOCK_SIZE - 1;
ret = blkcipher_walk_done(desc, walk, nbytes);
@@ -625,7 +627,8 @@
memcpy(xts_ctx->pcc.tweak, walk->iv, sizeof(xts_ctx->pcc.tweak));
param = xts_ctx->pcc.key + offset;
ret = crypt_s390_pcc(func, param);
- BUG_ON(ret < 0);
+ if (ret < 0)
+ return -EIO;
memcpy(xts_ctx->xts_param, xts_ctx->pcc.xts, 16);
param = xts_ctx->key + offset;
@@ -636,7 +639,8 @@
in = walk->src.virt.addr;
ret = crypt_s390_km(func, param, out, in, n);
- BUG_ON(ret < 0 || ret != n);
+ if (ret < 0 || ret != n)
+ return -EIO;
nbytes &= AES_BLOCK_SIZE - 1;
ret = blkcipher_walk_done(desc, walk, nbytes);
@@ -769,7 +773,8 @@
crypto_inc(ctrblk + i, AES_BLOCK_SIZE);
}
ret = crypt_s390_kmctr(func, sctx->key, out, in, n, ctrblk);
- BUG_ON(ret < 0 || ret != n);
+ if (ret < 0 || ret != n)
+ return -EIO;
if (n > AES_BLOCK_SIZE)
memcpy(ctrblk, ctrblk + n - AES_BLOCK_SIZE,
AES_BLOCK_SIZE);
@@ -788,7 +793,8 @@
in = walk->src.virt.addr;
ret = crypt_s390_kmctr(func, sctx->key, buf, in,
AES_BLOCK_SIZE, ctrblk);
- BUG_ON(ret < 0 || ret != AES_BLOCK_SIZE);
+ if (ret < 0 || ret != AES_BLOCK_SIZE)
+ return -EIO;
memcpy(out, buf, nbytes);
crypto_inc(ctrblk, AES_BLOCK_SIZE);
ret = blkcipher_walk_done(desc, walk, 0);
diff --git a/arch/s390/crypto/des_s390.c b/arch/s390/crypto/des_s390.c
index b49fb96..bcca01c 100644
--- a/arch/s390/crypto/des_s390.c
+++ b/arch/s390/crypto/des_s390.c
@@ -94,7 +94,8 @@
u8 *in = walk->src.virt.addr;
ret = crypt_s390_km(func, key, out, in, n);
- BUG_ON((ret < 0) || (ret != n));
+ if (ret < 0 || ret != n)
+ return -EIO;
nbytes &= DES_BLOCK_SIZE - 1;
ret = blkcipher_walk_done(desc, walk, nbytes);
@@ -120,7 +121,8 @@
u8 *in = walk->src.virt.addr;
ret = crypt_s390_kmc(func, iv, out, in, n);
- BUG_ON((ret < 0) || (ret != n));
+ if (ret < 0 || ret != n)
+ return -EIO;
nbytes &= DES_BLOCK_SIZE - 1;
ret = blkcipher_walk_done(desc, walk, nbytes);
@@ -386,7 +388,8 @@
crypto_inc(ctrblk + i, DES_BLOCK_SIZE);
}
ret = crypt_s390_kmctr(func, ctx->key, out, in, n, ctrblk);
- BUG_ON((ret < 0) || (ret != n));
+ if (ret < 0 || ret != n)
+ return -EIO;
if (n > DES_BLOCK_SIZE)
memcpy(ctrblk, ctrblk + n - DES_BLOCK_SIZE,
DES_BLOCK_SIZE);
@@ -404,7 +407,8 @@
in = walk->src.virt.addr;
ret = crypt_s390_kmctr(func, ctx->key, buf, in,
DES_BLOCK_SIZE, ctrblk);
- BUG_ON(ret < 0 || ret != DES_BLOCK_SIZE);
+ if (ret < 0 || ret != DES_BLOCK_SIZE)
+ return -EIO;
memcpy(out, buf, nbytes);
crypto_inc(ctrblk, DES_BLOCK_SIZE);
ret = blkcipher_walk_done(desc, walk, 0);
diff --git a/arch/s390/crypto/ghash_s390.c b/arch/s390/crypto/ghash_s390.c
index 1ebd3a1..d43485d 100644
--- a/arch/s390/crypto/ghash_s390.c
+++ b/arch/s390/crypto/ghash_s390.c
@@ -72,14 +72,16 @@
if (!dctx->bytes) {
ret = crypt_s390_kimd(KIMD_GHASH, ctx, buf,
GHASH_BLOCK_SIZE);
- BUG_ON(ret != GHASH_BLOCK_SIZE);
+ if (ret != GHASH_BLOCK_SIZE)
+ return -EIO;
}
}
n = srclen & ~(GHASH_BLOCK_SIZE - 1);
if (n) {
ret = crypt_s390_kimd(KIMD_GHASH, ctx, src, n);
- BUG_ON(ret != n);
+ if (ret != n)
+ return -EIO;
src += n;
srclen -= n;
}
@@ -92,7 +94,7 @@
return 0;
}
-static void ghash_flush(struct ghash_ctx *ctx, struct ghash_desc_ctx *dctx)
+static int ghash_flush(struct ghash_ctx *ctx, struct ghash_desc_ctx *dctx)
{
u8 *buf = dctx->buffer;
int ret;
@@ -103,21 +105,24 @@
memset(pos, 0, dctx->bytes);
ret = crypt_s390_kimd(KIMD_GHASH, ctx, buf, GHASH_BLOCK_SIZE);
- BUG_ON(ret != GHASH_BLOCK_SIZE);
+ if (ret != GHASH_BLOCK_SIZE)
+ return -EIO;
}
dctx->bytes = 0;
+ return 0;
}
static int ghash_final(struct shash_desc *desc, u8 *dst)
{
struct ghash_desc_ctx *dctx = shash_desc_ctx(desc);
struct ghash_ctx *ctx = crypto_shash_ctx(desc->tfm);
+ int ret;
- ghash_flush(ctx, dctx);
- memcpy(dst, ctx->icv, GHASH_BLOCK_SIZE);
-
- return 0;
+ ret = ghash_flush(ctx, dctx);
+ if (!ret)
+ memcpy(dst, ctx->icv, GHASH_BLOCK_SIZE);
+ return ret;
}
static struct shash_alg ghash_alg = {
diff --git a/arch/s390/crypto/sha_common.c b/arch/s390/crypto/sha_common.c
index bd37d09..8620b0e 100644
--- a/arch/s390/crypto/sha_common.c
+++ b/arch/s390/crypto/sha_common.c
@@ -36,7 +36,8 @@
if (index) {
memcpy(ctx->buf + index, data, bsize - index);
ret = crypt_s390_kimd(ctx->func, ctx->state, ctx->buf, bsize);
- BUG_ON(ret != bsize);
+ if (ret != bsize)
+ return -EIO;
data += bsize - index;
len -= bsize - index;
index = 0;
@@ -46,7 +47,8 @@
if (len >= bsize) {
ret = crypt_s390_kimd(ctx->func, ctx->state, data,
len & ~(bsize - 1));
- BUG_ON(ret != (len & ~(bsize - 1)));
+ if (ret != (len & ~(bsize - 1)))
+ return -EIO;
data += ret;
len -= ret;
}
@@ -88,7 +90,8 @@
memcpy(ctx->buf + end - 8, &bits, sizeof(bits));
ret = crypt_s390_kimd(ctx->func, ctx->state, ctx->buf, end);
- BUG_ON(ret != end);
+ if (ret != end)
+ return -EIO;
/* copy digest to out */
memcpy(out, ctx->state, crypto_shash_digestsize(desc->tfm));