From b7c4f5730a9fa258c8e79f6387a03f3a95c681a2 Mon Sep 17 00:00:00 2001 From: Sabrina Dubroca Date: Fri, 20 Oct 2023 16:00:55 +0200 Subject: tls: don't reset prot->aad_size and prot->tail_size for TLS_HW Prior to commit 1a074f7618e8 ("tls: also use init_prot_info in tls_set_device_offload"), setting TLS_HW on TX didn't touch prot->aad_size and prot->tail_size. They are set to 0 during context allocation (tls_prot_info is embedded in tls_context, kzalloc'd by tls_ctx_create). When the RX key is configured, tls_set_sw_offload is called (for both TLS_SW and TLS_HW). If the TX key is configured in TLS_HW mode after the RX key has been installed, init_prot_info will now overwrite the correct values of aad_size and tail_size, breaking SW decryption and causing -EBADMSG errors to be returned to userspace. Since TLS_HW doesn't use aad_size and tail_size at all (for TLS1.2, tail_size is always 0, and aad_size is equal to TLS_HEADER_SIZE + rec_seq_size), we can simply drop this hunk. Fixes: 1a074f7618e8 ("tls: also use init_prot_info in tls_set_device_offload") Signed-off-by: Sabrina Dubroca Acked-by: Jakub Kicinski Tested-by: Ran Rozenstein Link: https://lore.kernel.org/r/979d2f89a6a994d5bb49cae49a80be54150d094d.1697653889.git.sd@queasysnail.net Signed-off-by: Jakub Kicinski --- net/tls/tls_sw.c | 10 ++-------- 1 file changed, 2 insertions(+), 8 deletions(-) (limited to 'net/tls/tls_sw.c') diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c index b5905e60d792..a78e8e722409 100644 --- a/net/tls/tls_sw.c +++ b/net/tls/tls_sw.c @@ -2629,8 +2629,7 @@ static struct tls_sw_context_rx *init_ctx_rx(struct tls_context *ctx) int init_prot_info(struct tls_prot_info *prot, const struct tls_crypto_info *crypto_info, - const struct tls_cipher_desc *cipher_desc, - int mode) + const struct tls_cipher_desc *cipher_desc) { u16 nonce_size = cipher_desc->nonce; @@ -2643,11 +2642,6 @@ int init_prot_info(struct tls_prot_info *prot, prot->tail_size = 0; } - if (mode == TLS_HW) { - prot->aad_size = 0; - prot->tail_size = 0; - } - /* Sanity-check the sizes for stack allocations. */ if (nonce_size > TLS_MAX_IV_SIZE || prot->aad_size > TLS_MAX_AAD_SIZE) return -EINVAL; @@ -2707,7 +2701,7 @@ int tls_set_sw_offload(struct sock *sk, int tx) goto free_priv; } - rc = init_prot_info(prot, crypto_info, cipher_desc, TLS_SW); + rc = init_prot_info(prot, crypto_info, cipher_desc); if (rc) goto free_priv; -- cgit