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s390/crypto: fix gcm-aes-s390 selftest failures 

The current kernel uses improved crypto selftests. These
tests showed that the current implementation of gcm-aes-s390
is not able to deal with chunks of output buffers which are
not a multiple of 16 bytes. This patch introduces a rework
of the gcm aes s390 scatter walk handling which now is able
to handle any input and output scatter list chunk sizes
correctly.

Code has been verified by the crypto selftests, the tcrypt
kernel module and additional tests ran via the af_alg interface.

Cc: <stable@vger.kernel.org>
Reported-by: Julian Wiedmann <jwi@linux.ibm.com>
Reviewed-by: Patrick Steuer <steuer@linux.ibm.com>
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
This commit is contained in:
Harald Freudenberger 2019-05-23 16:18:25 +02:00 committed by Heiko Carstens
parent 7379e65279
commit bef9f0ba30
1 changed files with 107 additions and 41 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

148
arch/s390/crypto/aes_s390.c
View File

@ -826,19 +826,45 @@ static int gcm_aes_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
return 0;
}
static void gcm_sg_walk_start(struct gcm_sg_walk *gw, struct scatterlist *sg,
unsigned int len)
static void gcm_walk_start(struct gcm_sg_walk *gw, struct scatterlist *sg,
unsigned int len)
{
memset(gw, 0, sizeof(*gw));
gw->walk_bytes_remain = len;
scatterwalk_start(&gw->walk, sg);
}
static int gcm_sg_walk_go(struct gcm_sg_walk *gw, unsigned int minbytesneeded)
static inline unsigned int _gcm_sg_clamp_and_map(struct gcm_sg_walk *gw)
{
struct scatterlist *nextsg;
gw->walk_bytes = scatterwalk_clamp(&gw->walk, gw->walk_bytes_remain);
while (!gw->walk_bytes) {
nextsg = sg_next(gw->walk.sg);
if (!nextsg)
return 0;
scatterwalk_start(&gw->walk, nextsg);
gw->walk_bytes = scatterwalk_clamp(&gw->walk,
gw->walk_bytes_remain);
}
gw->walk_ptr = scatterwalk_map(&gw->walk);
return gw->walk_bytes;
}
static inline void _gcm_sg_unmap_and_advance(struct gcm_sg_walk *gw,
unsigned int nbytes)
{
gw->walk_bytes_remain -= nbytes;
scatterwalk_unmap(&gw->walk);
scatterwalk_advance(&gw->walk, nbytes);
scatterwalk_done(&gw->walk, 0, gw->walk_bytes_remain);
gw->walk_ptr = NULL;
}
static int gcm_in_walk_go(struct gcm_sg_walk *gw, unsigned int minbytesneeded)
{
int n;
/* minbytesneeded <= AES_BLOCK_SIZE */
if (gw->buf_bytes && gw->buf_bytes >= minbytesneeded) {
gw->ptr = gw->buf;
gw->nbytes = gw->buf_bytes;
@ -851,13 +877,11 @@ static int gcm_sg_walk_go(struct gcm_sg_walk *gw, unsigned int minbytesneeded)
goto out;
}
gw->walk_bytes = scatterwalk_clamp(&gw->walk, gw->walk_bytes_remain);
if (!gw->walk_bytes) {
scatterwalk_start(&gw->walk, sg_next(gw->walk.sg));
gw->walk_bytes = scatterwalk_clamp(&gw->walk,
gw->walk_bytes_remain);
if (!_gcm_sg_clamp_and_map(gw)) {
gw->ptr = NULL;
gw->nbytes = 0;
goto out;
}
gw->walk_ptr = scatterwalk_map(&gw->walk);
if (!gw->buf_bytes && gw->walk_bytes >= minbytesneeded) {
gw->ptr = gw->walk_ptr;
@ -869,51 +893,90 @@ static int gcm_sg_walk_go(struct gcm_sg_walk *gw, unsigned int minbytesneeded)
n = min(gw->walk_bytes, AES_BLOCK_SIZE - gw->buf_bytes);
memcpy(gw->buf + gw->buf_bytes, gw->walk_ptr, n);
gw->buf_bytes += n;
gw->walk_bytes_remain -= n;
scatterwalk_unmap(&gw->walk);
scatterwalk_advance(&gw->walk, n);
scatterwalk_done(&gw->walk, 0, gw->walk_bytes_remain);
_gcm_sg_unmap_and_advance(gw, n);
if (gw->buf_bytes >= minbytesneeded) {
gw->ptr = gw->buf;
gw->nbytes = gw->buf_bytes;
goto out;
}
gw->walk_bytes = scatterwalk_clamp(&gw->walk,
gw->walk_bytes_remain);
if (!gw->walk_bytes) {
scatterwalk_start(&gw->walk, sg_next(gw->walk.sg));
gw->walk_bytes = scatterwalk_clamp(&gw->walk,
gw->walk_bytes_remain);
if (!_gcm_sg_clamp_and_map(gw)) {
gw->ptr = NULL;
gw->nbytes = 0;
goto out;
}
gw->walk_ptr = scatterwalk_map(&gw->walk);
}
out:
return gw->nbytes;
}
static void gcm_sg_walk_done(struct gcm_sg_walk *gw, unsigned int bytesdone)
static int gcm_out_walk_go(struct gcm_sg_walk *gw, unsigned int minbytesneeded)
{
int n;
if (gw->walk_bytes_remain == 0) {
gw->ptr = NULL;
gw->nbytes = 0;
goto out;
}
if (!_gcm_sg_clamp_and_map(gw)) {
gw->ptr = NULL;
gw->nbytes = 0;
goto out;
}
if (gw->walk_bytes >= minbytesneeded) {
gw->ptr = gw->walk_ptr;
gw->nbytes = gw->walk_bytes;
goto out;
}
scatterwalk_unmap(&gw->walk);
gw->walk_ptr = NULL;
gw->ptr = gw->buf;
gw->nbytes = sizeof(gw->buf);
out:
return gw->nbytes;
}
static int gcm_in_walk_done(struct gcm_sg_walk *gw, unsigned int bytesdone)
{
if (gw->ptr == NULL)
return;
return 0;
if (gw->ptr == gw->buf) {
n = gw->buf_bytes - bytesdone;
int n = gw->buf_bytes - bytesdone;
if (n > 0) {
memmove(gw->buf, gw->buf + bytesdone, n);
gw->buf_bytes -= n;
gw->buf_bytes = n;
} else
gw->buf_bytes = 0;
} else {
gw->walk_bytes_remain -= bytesdone;
scatterwalk_unmap(&gw->walk);
scatterwalk_advance(&gw->walk, bytesdone);
scatterwalk_done(&gw->walk, 0, gw->walk_bytes_remain);
}
} else
_gcm_sg_unmap_and_advance(gw, bytesdone);
return bytesdone;
}
static int gcm_out_walk_done(struct gcm_sg_walk *gw, unsigned int bytesdone)
{
int i, n;
if (gw->ptr == NULL)
return 0;
if (gw->ptr == gw->buf) {
for (i = 0; i < bytesdone; i += n) {
if (!_gcm_sg_clamp_and_map(gw))
return i;
n = min(gw->walk_bytes, bytesdone - i);
memcpy(gw->walk_ptr, gw->buf + i, n);
_gcm_sg_unmap_and_advance(gw, n);
}
} else
_gcm_sg_unmap_and_advance(gw, bytesdone);
return bytesdone;
}
static int gcm_aes_crypt(struct aead_request *req, unsigned int flags)
@ -926,7 +989,7 @@ static int gcm_aes_crypt(struct aead_request *req, unsigned int flags)
unsigned int pclen = req->cryptlen;
int ret = 0;
unsigned int len, in_bytes, out_bytes,
unsigned int n, len, in_bytes, out_bytes,
min_bytes, bytes, aad_bytes, pc_bytes;
struct gcm_sg_walk gw_in, gw_out;
u8 tag[GHASH_DIGEST_SIZE];
@ -963,14 +1026,14 @@ static int gcm_aes_crypt(struct aead_request *req, unsigned int flags)
*(u32 *)(param.j0 + ivsize) = 1;
memcpy(param.k, ctx->key, ctx->key_len);
gcm_sg_walk_start(&gw_in, req->src, len);
gcm_sg_walk_start(&gw_out, req->dst, len);
gcm_walk_start(&gw_in, req->src, len);
gcm_walk_start(&gw_out, req->dst, len);
do {
min_bytes = min_t(unsigned int,
aadlen > 0 ? aadlen : pclen, AES_BLOCK_SIZE);
in_bytes = gcm_sg_walk_go(&gw_in, min_bytes);
out_bytes = gcm_sg_walk_go(&gw_out, min_bytes);
in_bytes = gcm_in_walk_go(&gw_in, min_bytes);
out_bytes = gcm_out_walk_go(&gw_out, min_bytes);
bytes = min(in_bytes, out_bytes);
if (aadlen + pclen <= bytes) {
@ -997,8 +1060,11 @@ static int gcm_aes_crypt(struct aead_request *req, unsigned int flags)
gw_in.ptr + aad_bytes, pc_bytes,
gw_in.ptr, aad_bytes);
gcm_sg_walk_done(&gw_in, aad_bytes + pc_bytes);
gcm_sg_walk_done(&gw_out, aad_bytes + pc_bytes);
n = aad_bytes + pc_bytes;
if (gcm_in_walk_done(&gw_in, n) != n)
return -ENOMEM;
if (gcm_out_walk_done(&gw_out, n) != n)
return -ENOMEM;
aadlen -= aad_bytes;
pclen -= pc_bytes;
} while (aadlen + pclen > 0);