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crypto: rsassa-pkcs1 - Copy source data for SG list

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As virtual addresses in general may not be suitable for DMA, always
perform a copy before using them in an SG list.

Fixes: 1e562deace ("crypto: rsassa-pkcs1 - Migrate to sig_alg backend")
Reported-by: Zorro Lang <zlang@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2024-11-29 17:53:16 +08:00
parent fac04efc5c
commit 8552cb04e0
1 changed files with 14 additions and 31 deletions
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45
crypto/rsassa-pkcs1.c
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@ -163,10 +163,6 @@ static int rsassa_pkcs1_sign(struct crypto_sig *tfm,
struct rsassa_pkcs1_inst_ctx *ictx = sig_instance_ctx(inst);
const struct hash_prefix *hash_prefix = ictx->hash_prefix;
struct rsassa_pkcs1_ctx *ctx = crypto_sig_ctx(tfm);
unsigned int child_reqsize = crypto_akcipher_reqsize(ctx->child);
struct akcipher_request *child_req __free(kfree_sensitive) = NULL;
struct scatterlist in_sg[3], out_sg;
struct crypto_wait cwait;
unsigned int pad_len;
unsigned int ps_end;
unsigned int len;
@ -187,37 +183,25 @@ static int rsassa_pkcs1_sign(struct crypto_sig *tfm,
pad_len = ctx->key_size - slen - hash_prefix->size - 1;
child_req = kmalloc(sizeof(*child_req) + child_reqsize + pad_len,
GFP_KERNEL);
if (!child_req)
return -ENOMEM;
/* RFC 8017 sec 8.2.1 step 1 - EMSA-PKCS1-v1_5 encoding generation */
in_buf = (u8 *)(child_req + 1) + child_reqsize;
in_buf = dst;
memmove(in_buf + pad_len + hash_prefix->size, src, slen);
memcpy(in_buf + pad_len, hash_prefix->data, hash_prefix->size);
ps_end = pad_len - 1;
in_buf[0] = 0x01;
memset(in_buf + 1, 0xff, ps_end - 1);
in_buf[ps_end] = 0x00;
/* RFC 8017 sec 8.2.1 step 2 - RSA signature */
crypto_init_wait(&cwait);
sg_init_table(in_sg, 3);
sg_set_buf(&in_sg[0], in_buf, pad_len);
sg_set_buf(&in_sg[1], hash_prefix->data, hash_prefix->size);
sg_set_buf(&in_sg[2], src, slen);
sg_init_one(&out_sg, dst, dlen);
akcipher_request_set_tfm(child_req, ctx->child);
akcipher_request_set_crypt(child_req, in_sg, &out_sg,
ctx->key_size - 1, dlen);
akcipher_request_set_callback(child_req, CRYPTO_TFM_REQ_MAY_SLEEP,
crypto_req_done, &cwait);
err = crypto_akcipher_decrypt(child_req);
err = crypto_wait_req(err, &cwait);
if (err)
/* RFC 8017 sec 8.2.1 step 2 - RSA signature */
err = crypto_akcipher_sync_decrypt(ctx->child, in_buf,
ctx->key_size - 1, in_buf,
ctx->key_size);
if (err < 0)
return err;
len = child_req->dst_len;
len = err;
pad_len = ctx->key_size - len;
/* Four billion to one */
@ -239,8 +223,8 @@ static int rsassa_pkcs1_verify(struct crypto_sig *tfm,
struct rsassa_pkcs1_ctx *ctx = crypto_sig_ctx(tfm);
unsigned int child_reqsize = crypto_akcipher_reqsize(ctx->child);
struct akcipher_request *child_req __free(kfree_sensitive) = NULL;
struct scatterlist in_sg, out_sg;
struct crypto_wait cwait;
struct scatterlist sg;
unsigned int dst_len;
unsigned int pos;
u8 *out_buf;
@ -259,13 +243,12 @@ static int rsassa_pkcs1_verify(struct crypto_sig *tfm,
return -ENOMEM;
out_buf = (u8 *)(child_req + 1) + child_reqsize;
memcpy(out_buf, src, slen);
crypto_init_wait(&cwait);
sg_init_one(&in_sg, src, slen);
sg_init_one(&out_sg, out_buf, ctx->key_size);
sg_init_one(&sg, out_buf, slen);
akcipher_request_set_tfm(child_req, ctx->child);
akcipher_request_set_crypt(child_req, &in_sg, &out_sg,
slen, ctx->key_size);
akcipher_request_set_crypt(child_req, &sg, &sg, slen, slen);
akcipher_request_set_callback(child_req, CRYPTO_TFM_REQ_MAY_SLEEP,
crypto_req_done, &cwait);