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s390/crypto: Don't panic after crypto instruction failures
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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>
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Jan Glauber authored and Martin Schwidefsky committed Nov 23, 2012
1 parent ce1d801 commit 36eb2ca
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Showing 4 changed files with 39 additions and 21 deletions.
18 changes: 12 additions & 6 deletions arch/s390/crypto/aes_s390.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -325,7 +325,8 @@ static int ecb_aes_crypt(struct blkcipher_desc *desc, long func, void *param,
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);
Expand Down Expand Up @@ -457,7 +458,8 @@ static int cbc_aes_crypt(struct blkcipher_desc *desc, long func, void *param,
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);
Expand Down Expand Up @@ -625,7 +627,8 @@ static int xts_aes_crypt(struct blkcipher_desc *desc, long func,
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;
Expand All @@ -636,7 +639,8 @@ static int xts_aes_crypt(struct blkcipher_desc *desc, long func,
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);
Expand Down Expand Up @@ -769,7 +773,8 @@ static int ctr_aes_crypt(struct blkcipher_desc *desc, long func,
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);
Expand All @@ -788,7 +793,8 @@ static int ctr_aes_crypt(struct blkcipher_desc *desc, long func,
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);
Expand Down
12 changes: 8 additions & 4 deletions arch/s390/crypto/des_s390.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -94,7 +94,8 @@ static int ecb_desall_crypt(struct blkcipher_desc *desc, long func,
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);
Expand All @@ -120,7 +121,8 @@ static int cbc_desall_crypt(struct blkcipher_desc *desc, long func,
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);
Expand Down Expand Up @@ -386,7 +388,8 @@ static int ctr_desall_crypt(struct blkcipher_desc *desc, long func,
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);
Expand All @@ -404,7 +407,8 @@ static int ctr_desall_crypt(struct blkcipher_desc *desc, long func,
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);
Expand Down
21 changes: 13 additions & 8 deletions arch/s390/crypto/ghash_s390.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -72,14 +72,16 @@ static int ghash_update(struct shash_desc *desc,
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;
}
Expand All @@ -92,7 +94,7 @@ static int ghash_update(struct shash_desc *desc,
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;
Expand All @@ -103,21 +105,24 @@ static void ghash_flush(struct ghash_ctx *ctx, struct ghash_desc_ctx *dctx)
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 = {
Expand Down
9 changes: 6 additions & 3 deletions arch/s390/crypto/sha_common.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -36,7 +36,8 @@ int s390_sha_update(struct shash_desc *desc, const u8 *data, unsigned int len)
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;
Expand All @@ -46,7 +47,8 @@ int s390_sha_update(struct shash_desc *desc, const u8 *data, unsigned int len)
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;
}
Expand Down Expand Up @@ -88,7 +90,8 @@ int s390_sha_final(struct shash_desc *desc, u8 *out)
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));
Expand Down

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