diff options
Diffstat (limited to 'net/tls/tls_sw.c')
| -rw-r--r-- | net/tls/tls_sw.c | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c index 4dc766b03f00..e1c93ce74e0f 100644 --- a/net/tls/tls_sw.c +++ b/net/tls/tls_sw.c @@ -41,6 +41,8 @@ #include <net/strparser.h> #include <net/tls.h> +#define MAX_IV_SIZE TLS_CIPHER_AES_GCM_128_IV_SIZE + static int tls_do_decryption(struct sock *sk, struct scatterlist *sgin, struct scatterlist *sgout, @@ -673,12 +675,11 @@ static int decrypt_skb(struct sock *sk, struct sk_buff *skb, { struct tls_context *tls_ctx = tls_get_ctx(sk); struct tls_sw_context *ctx = tls_sw_ctx(tls_ctx); - char iv[TLS_CIPHER_AES_GCM_128_SALT_SIZE + tls_ctx->rx.iv_size]; + char iv[TLS_CIPHER_AES_GCM_128_SALT_SIZE + MAX_IV_SIZE]; struct scatterlist sgin_arr[MAX_SKB_FRAGS + 2]; struct scatterlist *sgin = &sgin_arr[0]; struct strp_msg *rxm = strp_msg(skb); int ret, nsg = ARRAY_SIZE(sgin_arr); - char aad_recv[TLS_AAD_SPACE_SIZE]; struct sk_buff *unused; ret = skb_copy_bits(skb, rxm->offset + TLS_HEADER_SIZE, @@ -696,13 +697,13 @@ static int decrypt_skb(struct sock *sk, struct sk_buff *skb, } sg_init_table(sgin, nsg); - sg_set_buf(&sgin[0], aad_recv, sizeof(aad_recv)); + sg_set_buf(&sgin[0], ctx->rx_aad_ciphertext, TLS_AAD_SPACE_SIZE); nsg = skb_to_sgvec(skb, &sgin[1], rxm->offset + tls_ctx->rx.prepend_size, rxm->full_len - tls_ctx->rx.prepend_size); - tls_make_aad(aad_recv, + tls_make_aad(ctx->rx_aad_ciphertext, rxm->full_len - tls_ctx->rx.overhead_size, tls_ctx->rx.rec_seq, tls_ctx->rx.rec_seq_size, @@ -801,12 +802,12 @@ int tls_sw_recvmsg(struct sock *sk, if (to_copy <= len && page_count < MAX_SKB_FRAGS && likely(!(flags & MSG_PEEK))) { struct scatterlist sgin[MAX_SKB_FRAGS + 1]; - char unused[21]; int pages = 0; zc = true; sg_init_table(sgin, MAX_SKB_FRAGS + 1); - sg_set_buf(&sgin[0], unused, 13); + sg_set_buf(&sgin[0], ctx->rx_aad_plaintext, + TLS_AAD_SPACE_SIZE); err = zerocopy_from_iter(sk, &msg->msg_iter, to_copy, &pages, @@ -1094,6 +1095,12 @@ int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx) goto free_priv; } + /* Sanity-check the IV size for stack allocations. */ + if (iv_size > MAX_IV_SIZE) { + rc = -EINVAL; + goto free_priv; + } + cctx->prepend_size = TLS_HEADER_SIZE + nonce_size; cctx->tag_size = tag_size; cctx->overhead_size = cctx->prepend_size + cctx->tag_size; |