From nobody Tue Dec 16 11:06:22 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C1061E7544B for ; Tue, 3 Oct 2023 10:57:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239757AbjJCK5F (ORCPT ); Tue, 3 Oct 2023 06:57:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41108 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239735AbjJCK5E (ORCPT ); Tue, 3 Oct 2023 06:57:04 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 05D3A9B for ; Tue, 3 Oct 2023 03:57:01 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 68061C433CA; Tue, 3 Oct 2023 10:56:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1696330620; bh=L2ltrDergf8j+6fN/XHH5Y2TY5o3ImTEqYPcQIDDz74=; h=Date:From:To:Cc:Subject:From; b=XI3o7enOreh7fRsdaT70e9scAOoD65yQRBnHI6PYbVcep0ISwndyOulaRdbTy/VTF 0U9drLcniIQyOtYmnZjHHNM0cX3J1t8xX/uazdVob2up4RGkLBhod76s+s1+iDsUQL dN01yQ2zvr8ECqcQnAVSH8KQUr6SsXxDNNXQsqYQc/jksSmHJx3H5yk3pf2c9Y2a1K 17BlOVCZDoDyXgKR5wmI0VclvNtJLyP1+ntRipJp4kFsqTQ25kh3yl4FCZrhpVs9r3 1XOq2udkA3et5rTP2CVa8jqSzPzCLPjh2xg2J+ExgVfpFV75GBtuH+dKAgZWo1qYOW GmIlJrrfFpuTg== Date: Tue, 3 Oct 2023 12:56:54 +0200 From: "Gustavo A. R. Silva" To: Ayush Sawal , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Rohit Maheshwari Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, "Gustavo A. R. Silva" , linux-hardening@vger.kernel.org Subject: [PATCH v2][next] cxgb4/ch_ktls: Fix undefined behavior bug in struct chcr_ktls_ofld_ctx_tx Message-ID: MIME-Version: 1.0 Content-Disposition: inline Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" `struct tls_offload_context_tx` is a flexible structure, which means that it contains a flexible-array member at the bottom. This could potentially lead to an overwrite of the objects following `base` in `struct chcr_ktls_ofld_ctx_tx` at run-time. Notice that flexible-array member `driver_state` in `struct tls_offload_context_tx` can grow up to 16 bytes: | include/net/tls.h-170: | #define TLS_DRIVER_STATE_SIZE_TX 16 | include/net/tls.h-173: | #define TLS_OFFLOAD_CONTEXT_SIZE_TX \ | (sizeof(struct tls_offload_context_tx) + TLS_DRIVER_STATE_SIZE_TX) | net/tls/tls_device.c-1119: | offload_ctx =3D kzalloc(TLS_OFFLOAD_CONTEXT_SIZE_TX, GFP_KERNEL); Fix this by placing the declaration of object `base` at the end of `struct chcr_ktls_ofld_ctx_tx`. -Wflex-array-member-not-at-end is coming in GCC-14, and we are getting ready to enable it globally. Fixes: 34aba2c45024 ("cxgb4/chcr : Register to tls add and del callback") Cc: stable@vger.kernel.org Signed-off-by: Gustavo A. R. Silva --- Changes in v2: - Update changelog text: mention -Wflex-array-member-not-at-end. v1: - Link: https://lore.kernel.org/linux-hardening/ZRvyysCUTqA7aXN4@work/ drivers/net/ethernet/chelsio/inline_crypto/ch_ktls/chcr_ktls.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/chelsio/inline_crypto/ch_ktls/chcr_ktls.h= b/drivers/net/ethernet/chelsio/inline_crypto/ch_ktls/chcr_ktls.h index 10572dc55365..35e34e3db663 100644 --- a/drivers/net/ethernet/chelsio/inline_crypto/ch_ktls/chcr_ktls.h +++ b/drivers/net/ethernet/chelsio/inline_crypto/ch_ktls/chcr_ktls.h @@ -68,8 +68,8 @@ struct chcr_ktls_info { }; =20 struct chcr_ktls_ofld_ctx_tx { - struct tls_offload_context_tx base; struct chcr_ktls_info *chcr_info; + struct tls_offload_context_tx base; }; =20 struct chcr_ktls_uld_ctx { --=20 2.34.1