[PATCH v2] common/cnxk: validate cipher key length

Tejasree Kondoj
2026-03-19T09:27:31Z

Fixes: 24d10645bd ("common/cnxk: support CN20K IPsec session")
Cc: stable@dpdk.org

Signed-off-by: Tejasree Kondoj <ktejasree@marvell.com>
---
drivers/common/cnxk/cnxk_security.c | 127 ++++++++++++++++------------
drivers/common/cnxk/roc_cpt.h | 1 +
2 files changed, 76 insertions(+), 52 deletions(-)

diff --git a/drivers/common/cnxk/cnxk_security.c b/drivers/common/cnxk/cnxk_security.c
index 14d29e605a..04aca12131 100644
--- a/drivers/common/cnxk/cnxk_security.c
+++ b/drivers/common/cnxk/cnxk_security.c
@@ -170,6 +170,35 @@ ot_ipsec_sa_common_param_fill(union roc_ot_ipsec_sa_word2 *w2, uint8_t *cipher_k
w2->s.spi = ipsec_xfrm->spi;

if (key != NULL && length != 0) {
+ /* Validate key length and set AES key len before copy to avoid overflow */
+ if (w2->s.enc_type == ROC_IE_SA_ENC_AES_CBC ||
+ w2->s.enc_type == ROC_IE_SA_ENC_AES_CTR ||
+ w2->s.enc_type == ROC_IE_SA_ENC_AES_GCM ||
+ w2->s.enc_type == ROC_IE_SA_ENC_AES_CCM ||
+ w2->s.auth_type == ROC_IE_SA_AUTH_AES_GMAC) {
+ switch (length) {
+ case ROC_CPT_AES128_KEY_LEN:
+ w2->s.aes_key_len = ROC_IE_SA_AES_KEY_LEN_128;
+ break;
+ case ROC_CPT_AES192_KEY_LEN:
+ w2->s.aes_key_len = ROC_IE_SA_AES_KEY_LEN_192;
+ break;
+ case ROC_CPT_AES256_KEY_LEN:
+ w2->s.aes_key_len = ROC_IE_SA_AES_KEY_LEN_256;
+ break;
+ default:
+ plt_err("Invalid AES key length");
+ return -EINVAL;
+ }
+ }
+ if (w2->s.enc_type == ROC_IE_SA_ENC_DES_CBC && length != ROC_CPT_DES_KEY_LEN) {
+ plt_err("Invalid DES key length");
+ return -EINVAL;
+ }
+ if (w2->s.enc_type == ROC_IE_SA_ENC_3DES_CBC && length != ROC_CPT_DES3_KEY_LEN) {
+ plt_err("Invalid 3DES key length");
+ return -EINVAL;
+ }
/* Copy encryption key */
memcpy(cipher_key, key, length);
tmp_key = (uint64_t *)cipher_key;
@@ -177,30 +206,7 @@ ot_ipsec_sa_common_param_fill(union roc_ot_ipsec_sa_word2 *w2, uint8_t *cipher_k
tmp_key[i] = rte_be_to_cpu_64(tmp_key[i]);
}

- /* Set AES key length */
- if (w2->s.enc_type == ROC_IE_SA_ENC_AES_CBC ||
- w2->s.enc_type == ROC_IE_SA_ENC_AES_CTR ||
- w2->s.enc_type == ROC_IE_SA_ENC_AES_GCM ||
- w2->s.enc_type == ROC_IE_SA_ENC_AES_CCM ||
- w2->s.auth_type == ROC_IE_SA_AUTH_AES_GMAC) {
- switch (length) {
- case ROC_CPT_AES128_KEY_LEN:
- w2->s.aes_key_len = ROC_IE_SA_AES_KEY_LEN_128;
- break;
- case ROC_CPT_AES192_KEY_LEN:
- w2->s.aes_key_len = ROC_IE_SA_AES_KEY_LEN_192;
- break;
- case ROC_CPT_AES256_KEY_LEN:
- w2->s.aes_key_len = ROC_IE_SA_AES_KEY_LEN_256;
- break;
- default:
- plt_err("Invalid AES key length");
- return -EINVAL;
- }
- }
-
- if (ipsec_xfrm->life.packets_soft_limit != 0 ||
- ipsec_xfrm->life.packets_hard_limit != 0) {
+ if (ipsec_xfrm->life.packets_soft_limit != 0 || ipsec_xfrm->life.packets_hard_limit != 0) {
if (ipsec_xfrm->life.bytes_soft_limit != 0 ||
ipsec_xfrm->life.bytes_hard_limit != 0) {
plt_err("Expiry tracking with both packets & bytes is not supported");
@@ -844,9 +850,11 @@ on_ipsec_sa_ctl_set(struct rte_security_ipsec_xform *ipsec,
break;
case RTE_CRYPTO_CIPHER_DES_CBC:
ctl->enc_type = ROC_IE_SA_ENC_DES_CBC;
+ aes_key_len = cipher_xform->cipher.key.length;
break;
case RTE_CRYPTO_CIPHER_3DES_CBC:
ctl->enc_type = ROC_IE_SA_ENC_3DES_CBC;
+ aes_key_len = cipher_xform->cipher.key.length;
break;
case RTE_CRYPTO_CIPHER_AES_CBC:
ctl->enc_type = ROC_IE_SA_ENC_AES_CBC;
@@ -897,20 +905,18 @@ on_ipsec_sa_ctl_set(struct rte_security_ipsec_xform *ipsec,
}
}

- /* Set AES key length */
- if (ctl->enc_type == ROC_IE_SA_ENC_AES_CBC ||
- ctl->enc_type == ROC_IE_SA_ENC_AES_CTR ||
- ctl->enc_type == ROC_IE_SA_ENC_AES_GCM ||
- ctl->enc_type == ROC_IE_SA_ENC_AES_CCM ||
+ /* Validate and set AES key length before copy */
+ if (ctl->enc_type == ROC_IE_SA_ENC_AES_CBC || ctl->enc_type == ROC_IE_SA_ENC_AES_CTR ||
+ ctl->enc_type == ROC_IE_SA_ENC_AES_GCM || ctl->enc_type == ROC_IE_SA_ENC_AES_CCM ||
ctl->auth_type == ROC_IE_SA_AUTH_AES_GMAC) {
switch (aes_key_len) {
- case 16:
+ case ROC_CPT_AES128_KEY_LEN:
ctl->aes_key_len = ROC_IE_SA_AES_KEY_LEN_128;
break;
- case 24:
+ case ROC_CPT_AES192_KEY_LEN:
ctl->aes_key_len = ROC_IE_SA_AES_KEY_LEN_192;
break;
- case 32:
+ case ROC_CPT_AES256_KEY_LEN:
ctl->aes_key_len = ROC_IE_SA_AES_KEY_LEN_256;
break;
default:
@@ -918,6 +924,14 @@ on_ipsec_sa_ctl_set(struct rte_security_ipsec_xform *ipsec,
return -EINVAL;
}
}
+ if (ctl->enc_type == ROC_IE_SA_ENC_DES_CBC && aes_key_len != ROC_CPT_DES_KEY_LEN) {
+ plt_err("Invalid DES key length");
+ return -EINVAL;
+ }
+ if (ctl->enc_type == ROC_IE_SA_ENC_3DES_CBC && aes_key_len != ROC_CPT_DES3_KEY_LEN) {
+ plt_err("Invalid 3DES key length");
+ return -EINVAL;
+ }

if (ipsec->options.esn)
ctl->esn_en = 1;
@@ -1364,6 +1378,35 @@ ow_ipsec_sa_common_param_fill(union roc_ow_ipsec_sa_word2 *w2, uint8_t *cipher_k
w2->s.spi = ipsec_xfrm->spi;

if (key != NULL && length != 0) {
+ /* Validate key length and set AES key len before copy to avoid overflow */
+ if (w2->s.enc_type == ROC_IE_SA_ENC_AES_CBC ||
+ w2->s.enc_type == ROC_IE_SA_ENC_AES_CTR ||
+ w2->s.enc_type == ROC_IE_SA_ENC_AES_GCM ||
+ w2->s.enc_type == ROC_IE_SA_ENC_AES_CCM ||
+ w2->s.auth_type == ROC_IE_SA_AUTH_AES_GMAC) {
+ switch (length) {
+ case ROC_CPT_AES128_KEY_LEN:
+ w2->s.aes_key_len = ROC_IE_SA_AES_KEY_LEN_128;
+ break;
+ case ROC_CPT_AES192_KEY_LEN:
+ w2->s.aes_key_len = ROC_IE_SA_AES_KEY_LEN_192;
+ break;
+ case ROC_CPT_AES256_KEY_LEN:
+ w2->s.aes_key_len = ROC_IE_SA_AES_KEY_LEN_256;
+ break;
+ default:
+ plt_err("Invalid AES key length");
+ return -EINVAL;
+ }
+ }
+ if (w2->s.enc_type == ROC_IE_SA_ENC_DES_CBC && length != ROC_CPT_DES_KEY_LEN) {
+ plt_err("Invalid DES key length");
+ return -EINVAL;
+ }
+ if (w2->s.enc_type == ROC_IE_SA_ENC_3DES_CBC && length != ROC_CPT_DES3_KEY_LEN) {
+ plt_err("Invalid 3DES key length");
+ return -EINVAL;
+ }
/* Copy encryption key */
memcpy(cipher_key, key, length);
tmp_key = (uint64_t *)cipher_key;
@@ -1371,26 +1414,6 @@ ow_ipsec_sa_common_param_fill(union roc_ow_ipsec_sa_word2 *w2, uint8_t *cipher_k
tmp_key[i] = rte_be_to_cpu_64(tmp_key[i]);
}

- /* Set AES key length */
- if (w2->s.enc_type == ROC_IE_SA_ENC_AES_CBC || w2->s.enc_type == ROC_IE_SA_ENC_AES_CCM ||
- w2->s.enc_type == ROC_IE_SA_ENC_AES_CTR || w2->s.enc_type == ROC_IE_SA_ENC_AES_GCM ||
- w2->s.enc_type == ROC_IE_SA_ENC_AES_CCM || w2->s.auth_type == ROC_IE_SA_AUTH_AES_GMAC) {
- switch (length) {
- case ROC_CPT_AES128_KEY_LEN:
- w2->s.aes_key_len = ROC_IE_SA_AES_KEY_LEN_128;
- break;
- case ROC_CPT_AES192_KEY_LEN:
- w2->s.aes_key_len = ROC_IE_SA_AES_KEY_LEN_192;
- break;
- case ROC_CPT_AES256_KEY_LEN:
- w2->s.aes_key_len = ROC_IE_SA_AES_KEY_LEN_256;
- break;
- default:
- plt_err("Invalid AES key length");
- return -EINVAL;
- }
- }
-
if (ipsec_xfrm->life.packets_soft_limit != 0 || ipsec_xfrm->life.packets_hard_limit != 0) {
if (ipsec_xfrm->life.bytes_soft_limit != 0 ||
ipsec_xfrm->life.bytes_hard_limit != 0) {
diff --git a/drivers/common/cnxk/roc_cpt.h b/drivers/common/cnxk/roc_cpt.h
index 4715359f49..533d194bd4 100644
--- a/drivers/common/cnxk/roc_cpt.h
+++ b/drivers/common/cnxk/roc_cpt.h
@@ -79,6 +79,7 @@
#define ROC_CPT_SHA2_HMAC_LEN 16
#define ROC_CPT_DES_IV_LEN 8

+#define ROC_CPT_DES_KEY_LEN 8
#define ROC_CPT_DES3_KEY_LEN 24
#define ROC_CPT_AES128_KEY_LEN 16
#define ROC_CPT_AES192_KEY_LEN 24
--
2.25.1