From patchwork Fri Jun 2 19:42:47 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: "Gustavo A. R. Silva" X-Patchwork-Id: 13265803 X-Patchwork-Delegate: johannes@sipsolutions.net 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 B9474C77B7A for ; Fri, 2 Jun 2023 19:42:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236123AbjFBTmF (ORCPT ); Fri, 2 Jun 2023 15:42:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42096 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235923AbjFBTl6 (ORCPT ); Fri, 2 Jun 2023 15:41:58 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 163D9E40; Fri, 2 Jun 2023 12:41:57 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id A5A7061070; Fri, 2 Jun 2023 19:41:56 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3BCBFC433EF; Fri, 2 Jun 2023 19:41:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1685734916; bh=Pg9bfYuqnxQUKFcQcN4GaPtYdl08E/HIAub3ENBrWGc=; h=Date:From:To:Cc:Subject:From; b=GJNeBrnkVnERGcK4FVpVlecvQosDzKqGVO9hDYAe8lqZNJzYLXb1szRj+t8pe5MUI 7RqLwipnz8qsKkuq8qKtp/3VWOTivyeYGSYS1oIgNDhBd94ZV0fa/xFeR/GyH095zF Myk5l+y61plOkgt/vPGTHloNZnhUvANtX9FMiOBs1Fhfzdm4oob5171c/DOuBXIoEv J3WGkdq2ZYTUqS7gCnUUx3x0vngGavfsJLxJCu1V1sY+DZAtWuWUrCAIaVWorZdzNJ lR7w/04uvITch+CvSEajMBb2/YQqRqVhaNjBgocfNTa1v7OSe2sFP677PPaQlKZivS udofzhDnKVl+g== Date: Fri, 2 Jun 2023 13:42:47 -0600 From: "Gustavo A. R. Silva" To: Gregory Greenman , Kalle Valo , Haim Dreyfuss , Johannes Berg Cc: linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, "Gustavo A. R. Silva" , linux-hardening@vger.kernel.org Subject: [PATCH v2] wifi: iwlwifi: mvm: Fix -Warray-bounds bug in iwl_mvm_wait_d3_notif() Message-ID: MIME-Version: 1.0 Content-Disposition: inline Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org kmemdup() at line 2735 is not duplicating enough memory for notif->tid_tear_down and notif->station_id. As it only duplicates 612 bytes: up to offsetofend(struct iwl_wowlan_info_notif, received_beacons), this is the range of [0, 612) bytes. 2735 notif = kmemdup(notif_v1, 2736 offsetofend(struct iwl_wowlan_info_notif, 2737 received_beacons), 2738 GFP_ATOMIC); which evidently does not cover bytes 612 and 613 for members tid_tear_down and station_id in struct iwl_wowlan_info_notif. See below: $ pahole -C iwl_wowlan_info_notif drivers/net/wireless/intel/iwlwifi/mvm/d3.o struct iwl_wowlan_info_notif { struct iwl_wowlan_gtk_status_v3 gtk[2]; /* 0 488 */ /* --- cacheline 7 boundary (448 bytes) was 40 bytes ago --- */ struct iwl_wowlan_igtk_status igtk[2]; /* 488 80 */ /* --- cacheline 8 boundary (512 bytes) was 56 bytes ago --- */ __le64 replay_ctr; /* 568 8 */ /* --- cacheline 9 boundary (576 bytes) --- */ __le16 pattern_number; /* 576 2 */ __le16 reserved1; /* 578 2 */ __le16 qos_seq_ctr[8]; /* 580 16 */ __le32 wakeup_reasons; /* 596 4 */ __le32 num_of_gtk_rekeys; /* 600 4 */ __le32 transmitted_ndps; /* 604 4 */ __le32 received_beacons; /* 608 4 */ u8 tid_tear_down; /* 612 1 */ u8 station_id; /* 613 1 */ u8 reserved2[2]; /* 614 2 */ /* size: 616, cachelines: 10, members: 13 */ /* last cacheline: 40 bytes */ }; Therefore, when the following assignments take place, actually no memory has been allocated for those objects: 2743 notif->tid_tear_down = notif_v1->tid_tear_down; 2744 notif->station_id = notif_v1->station_id; Fix this by allocating space for the whole notif object and zero out the remaining space in memory after member station_id. This also fixes the following -Warray-bounds issues: CC drivers/net/wireless/intel/iwlwifi/mvm/d3.o drivers/net/wireless/intel/iwlwifi/mvm/d3.c: In function ‘iwl_mvm_wait_d3_notif’: drivers/net/wireless/intel/iwlwifi/mvm/d3.c:2743:30: warning: array subscript ‘struct iwl_wowlan_info_notif[0]’ is partly outside array bounds of ‘unsigned char[612]’ [-Warray-bounds=] 2743 | notif->tid_tear_down = notif_v1->tid_tear_down; | from drivers/net/wireless/intel/iwlwifi/mvm/d3.c:7: In function ‘kmemdup’, inlined from ‘iwl_mvm_wait_d3_notif’ at drivers/net/wireless/intel/iwlwifi/mvm/d3.c:2735:12: include/linux/fortify-string.h:765:16: note: object of size 612 allocated by ‘__real_kmemdup’ 765 | return __real_kmemdup(p, size, gfp); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/net/wireless/intel/iwlwifi/mvm/d3.c: In function ‘iwl_mvm_wait_d3_notif’: drivers/net/wireless/intel/iwlwifi/mvm/d3.c:2744:30: warning: array subscript ‘struct iwl_wowlan_info_notif[0]’ is partly outside array bounds of ‘unsigned char[612]’ [-Warray-bounds=] 2744 | notif->station_id = notif_v1->station_id; | ^~ In function ‘kmemdup’, inlined from ‘iwl_mvm_wait_d3_notif’ at drivers/net/wireless/intel/iwlwifi/mvm/d3.c:2735:12: include/linux/fortify-string.h:765:16: note: object of size 612 allocated by ‘__real_kmemdup’ 765 | return __real_kmemdup(p, size, gfp); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ Link: https://github.com/KSPP/linux/issues/306 Fixes: 905d50ddbc83 ("wifi: iwlwifi: mvm: support wowlan info notification version 2") Cc: stable@vger.kernel.org Signed-off-by: Gustavo A. R. Silva Acked-by: Gregory Greenman --- Changes in v2: - Use sizeof(*notif), instead of sizeof(struct iwl_wowlan_info_notif). - Fix typo in the changelog text s/bouds/bounds. v1: - Link: https://lore.kernel.org/linux-hardening/ZHpEjTmBys5cCOGZ@work/ drivers/net/wireless/intel/iwlwifi/mvm/d3.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/d3.c b/drivers/net/wireless/intel/iwlwifi/mvm/d3.c index 37aa4676dc94..6d1007f24b4a 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/d3.c +++ b/drivers/net/wireless/intel/iwlwifi/mvm/d3.c @@ -2732,17 +2732,13 @@ static bool iwl_mvm_wait_d3_notif(struct iwl_notif_wait_data *notif_wait, if (wowlan_info_ver < 2) { struct iwl_wowlan_info_notif_v1 *notif_v1 = (void *)pkt->data; - notif = kmemdup(notif_v1, - offsetofend(struct iwl_wowlan_info_notif, - received_beacons), - GFP_ATOMIC); - + notif = kmemdup(notif_v1, sizeof(*notif), GFP_ATOMIC); if (!notif) return false; notif->tid_tear_down = notif_v1->tid_tear_down; notif->station_id = notif_v1->station_id; - + memset_after(notif, 0, station_id); } else { notif = (void *)pkt->data; }