From patchwork Wed Aug 23 22:30:51 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Gustavo A. R. Silva" X-Patchwork-Id: 716867 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 98097C7113B for ; Wed, 23 Aug 2023 22:30:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238635AbjHWWaI (ORCPT ); Wed, 23 Aug 2023 18:30:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53614 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238704AbjHWW37 (ORCPT ); Wed, 23 Aug 2023 18:29:59 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C5B6810F5; Wed, 23 Aug 2023 15:29:52 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 5514563668; Wed, 23 Aug 2023 22:29:52 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9D384C433C7; Wed, 23 Aug 2023 22:29:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1692829791; bh=+BTa0iiOl5MKGJTbMH2NQ3i0H+h76fDQsRzTlmL2TKo=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=YXswDFyeMO4uQE4Pw332ov+8C9+dpiVGQW8cM87R4HVdqB1A5+sb+cw9RuA+iHCVu jIDwYH5ghryTaHtIytaW/PgtKqcONMhvkAev+uAbCPA9NbnCCfiL5xlUA6H9Fj2CIJ M2kY0a3TWsgYEtc1EZjyXvCnnCH7WvkCOdoHsykoKPa9BbGlkujy3nI+hTl5dn4UDi 5StPCp+2DfvisYvRShrobiPX82u6ah5dV3qDqO7VfMQmB/Og8j128w/nqYuRM/rSgD lEA2bVIblYA2TtTO/SG/4xJ1yXrfyIuUbkbPM7t/6mn6K8FsuIwTAcUn6Zfi0Yu6NK wpWwptCiGcVVA== Date: Wed, 23 Aug 2023 16:30:51 -0600 From: "Gustavo A. R. Silva" To: Brian Norris , Kalle Valo , Amitkumar Karwar , Xinming Hu , Dan Williams Cc: linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, "Gustavo A. R. Silva" , linux-hardening@vger.kernel.org Subject: [PATCH 1/3] wifi: mwifiex: Fix tlv_buf_left calculation Message-ID: <698dc480d939e3ae490140db5c2f36eb84093594.1692829410.git.gustavoars@kernel.org> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org In a TLV encoding scheme, the Length part represents the length after the header containing the values for type and length. In this case, `tlv_len` should be: tlv_len == (sizeof(*tlv_rxba) - 1) - sizeof(tlv_rxba->header) + tlv_bitmap_len Notice that the `- 1` accounts for the one-element array `bitmap`, which 1-byte size is already included in `sizeof(*tlv_rxba)`. So, if the above is correct, there is a double-counting of some members in `struct mwifiex_ie_types_rxba_sync`, when `tlv_buf_left` and `tmp` are calculated: 968 tlv_buf_left -= (sizeof(*tlv_rxba) + tlv_len); 969 tmp = (u8 *)tlv_rxba + tlv_len + sizeof(*tlv_rxba); in specific, members: drivers/net/wireless/marvell/mwifiex/fw.h:777 777 u8 mac[ETH_ALEN]; 778 u8 tid; 779 u8 reserved; 780 __le16 seq_num; 781 __le16 bitmap_len; This is clearly wrong, and affects the subsequent decoding of data from `event_buf` through `tlv_rxba`: 970 tlv_rxba = (struct mwifiex_ie_types_rxba_sync *)tmp; Fix this by using `sizeof(tlv_rxba->header)` instead of `sizeof(*tlv_rxba)` in the calculation of `tlv_buf_left` and `tmp`. This results in the following binary differences before/after changes: | drivers/net/wireless/marvell/mwifiex/11n_rxreorder.o | @@ -4698,11 +4698,11 @@ | tlv_buf_left -= (sizeof(tlv_rxba->header) + tlv_len); | - 1da7: lea -0x11(%rbx),%edx | + 1da7: lea -0x4(%rbx),%edx | 1daa: movzwl %bp,%eax | drivers/net/wireless/marvell/mwifiex/11n_rxreorder.c:969 | tmp = (u8 *)tlv_rxba + sizeof(tlv_rxba->header) + tlv_len; | - 1dad: lea 0x11(%r15,%rbp,1),%r15 | + 1dad: lea 0x4(%r15,%rbp,1),%r15 | drivers/net/wireless/marvell/mwifiex/11n_rxreorder.c:968 | tlv_buf_left -= (sizeof(tlv_rxba->header) + tlv_len); | 1db2: mov %edx,%ebx The above reflects the desired change: avoid counting 13 too bytes; which is the total size of the double-counted members in `struct mwifiex_ie_types_rxba_sync`: $ pahole -C mwifiex_ie_types_rxba_sync drivers/net/wireless/marvell/mwifiex/11n_rxreorder.o struct mwifiex_ie_types_rxba_sync { struct mwifiex_ie_types_header header; /* 0 4 */ |----------------------------------------------------------------------- | u8 mac[6]; /* 4 6 */ | | u8 tid; /* 10 1 */ | | u8 reserved; /* 11 1 */ | | __le16 seq_num; /* 12 2 */ | | __le16 bitmap_len; /* 14 2 */ | | u8 bitmap[1]; /* 16 1 */ | |----------------------------------------------------------------------| | 13 bytes| ----------- /* size: 17, cachelines: 1, members: 7 */ /* last cacheline: 17 bytes */ } __attribute__((__packed__)); Fixes: 99ffe72cdae4 ("mwifiex: process rxba_sync event") Cc: stable@vger.kernel.org Signed-off-by: Gustavo A. R. Silva Reviewed-by: Justin Stitt --- drivers/net/wireless/marvell/mwifiex/11n_rxreorder.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/marvell/mwifiex/11n_rxreorder.c b/drivers/net/wireless/marvell/mwifiex/11n_rxreorder.c index 391793a16adc..d1d3632a3ed7 100644 --- a/drivers/net/wireless/marvell/mwifiex/11n_rxreorder.c +++ b/drivers/net/wireless/marvell/mwifiex/11n_rxreorder.c @@ -965,8 +965,8 @@ void mwifiex_11n_rxba_sync_event(struct mwifiex_private *priv, } } - tlv_buf_left -= (sizeof(*tlv_rxba) + tlv_len); - tmp = (u8 *)tlv_rxba + tlv_len + sizeof(*tlv_rxba); + tlv_buf_left -= (sizeof(tlv_rxba->header) + tlv_len); + tmp = (u8 *)tlv_rxba + sizeof(tlv_rxba->header) + tlv_len; tlv_rxba = (struct mwifiex_ie_types_rxba_sync *)tmp; } } From patchwork Wed Aug 23 22:32:06 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Gustavo A. R. Silva" X-Patchwork-Id: 716477 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 D6DFDC27C40 for ; Wed, 23 Aug 2023 22:32:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238654AbjHWWbn (ORCPT ); Wed, 23 Aug 2023 18:31:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56084 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238646AbjHWWbM (ORCPT ); Wed, 23 Aug 2023 18:31:12 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8CACB1701; Wed, 23 Aug 2023 15:31:08 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 21C7562369; Wed, 23 Aug 2023 22:31:08 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5F293C433C8; Wed, 23 Aug 2023 22:31:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1692829867; bh=7LddEz2AC5zh2tF8Hq6Rqi34+txun2qg3JRu3gII7P4=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=ASQx5g1LUUoFGyQaaK4qN2QP2Cu3UunhFaR1+PFBMr4h+z4bm7g9ALVBQ8Zi8fuZt Y3vCUH9nf/Vi2cLS6q4kF9Y7toF31nSLYdXivLxWPMbfC7bZn/6JEhzqiaRc4uPRVY /y/bple93yQDmkE8iHt3w88CzubgT1G1SpU+toRrwy3QRGkHUhFGS63zPiofOVa558 PtA2cRln0uxTCVMx+qJHUILa3d2d2NBcg5AGMNOTIP/lXhFhy7ZJlub/fOedlYD9xP xRS/CINTBH+aK4NSwvXso9XHui7HG6BdSemvpqxp5JY4Gb4vg46Myi4gG04/LGMfzV TVJWPYwHESoIw== Date: Wed, 23 Aug 2023 16:32:06 -0600 From: "Gustavo A. R. Silva" To: Brian Norris , Kalle Valo , Amitkumar Karwar , Xinming Hu , Dan Williams Cc: linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, "Gustavo A. R. Silva" , linux-hardening@vger.kernel.org Subject: [PATCH 2/3] wifi: mwifiex: Replace one-element array with flexible-array member in struct mwifiex_ie_types_rxba_sync Message-ID: <774ab3c21e1f2ee9c95909e5779216d83d05fd9f.1692829410.git.gustavoars@kernel.org> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org One-element and zero-length arrays are deprecated. So, replace one-element array in struct mwifiex_ie_types_rxba_sync with flexible-array member, and refactor the rest of the code, accordingly. This results in no differences in binary output. Signed-off-by: Gustavo A. R. Silva Reviewed-by: Justin Stitt --- drivers/net/wireless/marvell/mwifiex/11n_rxreorder.c | 2 +- drivers/net/wireless/marvell/mwifiex/fw.h | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/marvell/mwifiex/11n_rxreorder.c b/drivers/net/wireless/marvell/mwifiex/11n_rxreorder.c index d1d3632a3ed7..735aac52bdc4 100644 --- a/drivers/net/wireless/marvell/mwifiex/11n_rxreorder.c +++ b/drivers/net/wireless/marvell/mwifiex/11n_rxreorder.c @@ -918,7 +918,7 @@ void mwifiex_11n_rxba_sync_event(struct mwifiex_private *priv, mwifiex_dbg_dump(priv->adapter, EVT_D, "RXBA_SYNC event:", event_buf, len); - while (tlv_buf_left >= sizeof(*tlv_rxba)) { + while (tlv_buf_left > sizeof(*tlv_rxba)) { tlv_type = le16_to_cpu(tlv_rxba->header.type); tlv_len = le16_to_cpu(tlv_rxba->header.len); if (tlv_type != TLV_TYPE_RXBA_SYNC) { diff --git a/drivers/net/wireless/marvell/mwifiex/fw.h b/drivers/net/wireless/marvell/mwifiex/fw.h index f2168fac95ed..8e6db904e5b2 100644 --- a/drivers/net/wireless/marvell/mwifiex/fw.h +++ b/drivers/net/wireless/marvell/mwifiex/fw.h @@ -779,7 +779,7 @@ struct mwifiex_ie_types_rxba_sync { u8 reserved; __le16 seq_num; __le16 bitmap_len; - u8 bitmap[1]; + u8 bitmap[]; } __packed; struct chan_band_param_set { From patchwork Wed Aug 23 22:33:19 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Gustavo A. R. Silva" X-Patchwork-Id: 716866 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 5B16DC27C40 for ; Wed, 23 Aug 2023 22:33:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238671AbjHWWct (ORCPT ); Wed, 23 Aug 2023 18:32:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40774 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238679AbjHWWcX (ORCPT ); Wed, 23 Aug 2023 18:32:23 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BED0010F2; Wed, 23 Aug 2023 15:32:20 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 4538A62E8E; Wed, 23 Aug 2023 22:32:20 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 86EEAC433C8; Wed, 23 Aug 2023 22:32:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1692829939; bh=/JEr4TiHL6f3C8pK8z0KSpApP+0BeWgNlnpN+Skgn7Q=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=of+NJVqTH37IuwzRB3hQZIxEBU6zwQHRnlCyo4vyD670RFKtLzpqWBdOnfwrrI1Jb BQejQs9AOsAwUnqd3cGDLhgouANeu61BqiJmS9E0PN893UZ+/pe/gGfRSN7kw8nIHO ce7DiCu6Jf0iy3EBBe93u6vdycW0xhnHhWTqawU8UO+4fUwTlUx2CahpI14KewSn7R U3UDb6nBBkkWio+YolLAj9ob8MaaCG9oOroDVHflJgA+uSrsBGy/WGC6ZYOxojvw4m 791gs3XOdI30sDc5bEYu7qvGOiRyoyP7g//LCzjnxuHxL4l5BXeYUlbDICQjLdr7Pn CpqYCP6KTra7Q== Date: Wed, 23 Aug 2023 16:33:19 -0600 From: "Gustavo A. R. Silva" To: Brian Norris , Kalle Valo , Amitkumar Karwar , Xinming Hu , Dan Williams Cc: linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, "Gustavo A. R. Silva" , linux-hardening@vger.kernel.org Subject: [PATCH 3/3] wifi: mwifiex: Sanity check tlv_len and tlv_bitmap_len Message-ID: <587423b0737108effe82aefed4407daca39e9a51.1692829410.git.gustavoars@kernel.org> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org Add sanity checks for both `tlv_len` and `tlv_bitmap_len` before decoding data from `event_buf`. This prevents any malicious or buggy firmware from overflowing `event_buf` through large values for `tlv_len` or `tlv_bitmap_len`. Suggested-by: Dan Williams Signed-off-by: Gustavo A. R. Silva Reviewed-by: Justin Stitt --- .../net/wireless/marvell/mwifiex/11n_rxreorder.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/net/wireless/marvell/mwifiex/11n_rxreorder.c b/drivers/net/wireless/marvell/mwifiex/11n_rxreorder.c index 735aac52bdc4..9ee3b9f1e9ce 100644 --- a/drivers/net/wireless/marvell/mwifiex/11n_rxreorder.c +++ b/drivers/net/wireless/marvell/mwifiex/11n_rxreorder.c @@ -921,6 +921,14 @@ void mwifiex_11n_rxba_sync_event(struct mwifiex_private *priv, while (tlv_buf_left > sizeof(*tlv_rxba)) { tlv_type = le16_to_cpu(tlv_rxba->header.type); tlv_len = le16_to_cpu(tlv_rxba->header.len); + if (size_add(sizeof(tlv_rxba->header), tlv_len) > tlv_buf_left) { + mwifiex_dbg(priv->adapter, WARN, + "TLV size (%ld) overflows event_buf (%d)\n", + size_add(sizeof(tlv_rxba->header), tlv_len), + tlv_buf_left); + return; + } + if (tlv_type != TLV_TYPE_RXBA_SYNC) { mwifiex_dbg(priv->adapter, ERROR, "Wrong TLV id=0x%x\n", tlv_type); @@ -929,6 +937,14 @@ void mwifiex_11n_rxba_sync_event(struct mwifiex_private *priv, tlv_seq_num = le16_to_cpu(tlv_rxba->seq_num); tlv_bitmap_len = le16_to_cpu(tlv_rxba->bitmap_len); + if (size_add(sizeof(*tlv_rxba), tlv_bitmap_len) > tlv_buf_left) { + mwifiex_dbg(priv->adapter, WARN, + "TLV size (%ld) overflows event_buf (%d)\n", + size_add(sizeof(*tlv_rxba), tlv_bitmap_len), + tlv_buf_left); + return; + } + mwifiex_dbg(priv->adapter, INFO, "%pM tid=%d seq_num=%d bitmap_len=%d\n", tlv_rxba->mac, tlv_rxba->tid, tlv_seq_num,