From patchwork Wed Nov 16 09:53:48 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Minsuk Kang X-Patchwork-Id: 13044604 X-Patchwork-Delegate: kvalo@adurom.com 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 1B942C433FE for ; Wed, 16 Nov 2022 09:54:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229585AbiKPJy3 (ORCPT ); Wed, 16 Nov 2022 04:54:29 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37656 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230113AbiKPJyU (ORCPT ); Wed, 16 Nov 2022 04:54:20 -0500 Received: from mail-pj1-x102d.google.com (mail-pj1-x102d.google.com [IPv6:2607:f8b0:4864:20::102d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6FE2C1BF for ; Wed, 16 Nov 2022 01:54:13 -0800 (PST) Received: by mail-pj1-x102d.google.com with SMTP id l22-20020a17090a3f1600b00212fbbcfb78so1779954pjc.3 for ; Wed, 16 Nov 2022 01:54:13 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yonsei-ac-kr.20210112.gappssmtp.com; s=20210112; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=SBxEOrfwQt5bX60pxvlzCG2VvV3QgdPMkgl6WhCOa+0=; b=ZzYDNxkGJ3DPOU52Ye4ycgfZFoj8Zh8vCEjZGTxwOHVv7+E17VXifmuujpRkqLYPs2 Vko8n6bvK4IOfyiy3BRlXGh3VnzWd7goETopMJTS7Q5haWgTvRqxp0RZReIEI+YiP/Kb ugeGZ7ZOEWIMejbFVbRmf8Z8cw4TVR6aILDo5yXiAawIomHxgdkLzj5n/BCCY7CewXPd xfR6E7XzQO5XALLcMap1gAiaYS/IgsasWD9foS+ZLlQqxINNZukaUIRJFAsS6awtbUMQ 6os5dsOGRFIZhEojqDG2axvcJnxgTMj6iCKsQdzJ2W7mN/beYW06N1q9mj/n9B998EIQ jb6w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=SBxEOrfwQt5bX60pxvlzCG2VvV3QgdPMkgl6WhCOa+0=; b=Z9PFopoT5fuLYpAOmwysfecQtoeaGJYTU5QzF/onLclsYis0xauHzNBVmxN/nKgRLY /5NPAAhW6XKqYiipaamaUKfr7nrq/1gR1WNH06ZEJciyAFcQU/3LPwJ+C5lkrgVVDHxK 7cNve5675yhcBhn14f94V2ilgIMXy86/KNQgK3hyw8zy9wW+iQeTRwAH/6EUG9u8giLT 8VIHvNatnJlO4JdqgA8Ae+qk38+c+KzWehH49DJmbhHWRsqCOf5w+6CXwxMbFbvxMPmK rhWFY6fh10pCwHBdpPbBks6B7qi9ONEDSY4Y9bRDGsw4if195LRoTJuQOlB7zDk9TsZA sdoQ== X-Gm-Message-State: ANoB5pmDbS/Ydfj2DER1nG3chTmpkfZHIWFLv0T6B8uQirfrNJkIDZdi zKwVVzVPgrCa9G2pxmUTTTT994Xl5J3DpIM6 X-Google-Smtp-Source: AA0mqf5nX3baEa/b5R1sMG8VBakKSZXckr4SuMHPI5hXpbz339RZ484hYitvlgtZqPEtkbaCz4UN5Q== X-Received: by 2002:a17:902:c60a:b0:188:77a7:eb5 with SMTP id r10-20020a170902c60a00b0018877a70eb5mr8251825plr.6.1668592452619; Wed, 16 Nov 2022 01:54:12 -0800 (PST) Received: from localhost.localdomain ([165.132.118.52]) by smtp.gmail.com with ESMTPSA id o1-20020aa79781000000b0056ba02feda1sm10658202pfp.94.2022.11.16.01.54.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 16 Nov 2022 01:54:12 -0800 (PST) From: Minsuk Kang To: linux-wireless@vger.kernel.org, aspriel@gmail.com Cc: dokyungs@yonsei.ac.kr, jisoo.jang@yonsei.ac.kr, Minsuk Kang Subject: [PATCH] wifi: brcmfmac: Fix potential slab-out-of-bounds read in brcmf_inform_single_bss() Date: Wed, 16 Nov 2022 18:53:48 +0900 Message-Id: <20221116095348.494518-1-linuxlovemin@yonsei.ac.kr> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org This patch fixes a slab-out-of-bounds read in brcmfmac that occurs in cfg80211_find_elem_match() called from brcmf_inform_single_bss() when the offset and length values of information elements provided by the device exceed the boundary of the escan buffer that contains information elements. The patch adds a check that makes the function return -EINVAL if that is the case. Note that the negative return is handled by the caller, brcmf_inform_bss(). Found by a modified version of syzkaller. ================================================================== BUG: KASAN: slab-out-of-bounds in cfg80211_find_elem_match+0x164/0x180 Read of size 1 at addr ffff888018f0fde9 by task kworker/0:2/1896 CPU: 0 PID: 1896 Comm: kworker/0:2 Tainted: G O 5.14.0+ #139 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.1-0-ga5cab58e9a3f-prebuilt.qemu.org 04/01/2014 Workqueue: events brcmf_fweh_event_worker Call Trace: dump_stack_lvl+0x8e/0xd1 print_address_description.constprop.0.cold+0x93/0x334 ? cfg80211_find_elem_match+0x164/0x180 kasan_report.cold+0x79/0xd5 ? cfg80211_find_elem_match+0x164/0x180 cfg80211_find_elem_match+0x164/0x180 cfg80211_get_bss_channel+0x69/0x320 cfg80211_inform_single_bss_data+0x1a6/0x1060 ? cfg80211_bss_update+0x1e20/0x1e20 ? rcu_read_lock_sched_held+0xa1/0xd0 ? rcu_read_lock_bh_held+0xb0/0xb0 ? find_held_lock+0x2d/0x110 ? cfg80211_inform_bss_data+0xcb/0x160 cfg80211_inform_bss_data+0xcb/0x160 ? cfg80211_parse_mbssid_data+0x1540/0x1540 ? kvm_clock_get_cycles+0x14/0x20 ? ktime_get_with_offset+0x2b9/0x450 brcmf_inform_single_bss+0x36d/0x4d0 ? brcmf_notify_mic_status+0xb0/0xb0 ? __lock_acquire+0x181f/0x5790 ? brcmf_p2p_cancel_remain_on_channel+0x30/0x30 brcmf_inform_bss+0x131/0x210 brcmf_cfg80211_escan_handler+0x779/0xd20 ? rcu_read_lock_bh_held+0xb0/0xb0 ? lock_acquire+0x19d/0x4e0 ? find_held_lock+0x2d/0x110 ? brcmf_cfg80211_escan_timeout_worker+0x60/0x60 ? brcmf_fweh_event_worker+0x249/0xc00 ? mark_held_locks+0x9f/0xe0 ? lockdep_hardirqs_on_prepare+0x3e0/0x3e0 ? brcmf_cfg80211_escan_timeout_worker+0x60/0x60 brcmf_fweh_call_event_handler.isra.0+0x90/0x100 brcmf_fweh_event_worker+0x117/0xc00 ? brcmf_fweh_call_event_handler.isra.0+0x100/0x100 ? rcu_read_lock_sched_held+0xa1/0xd0 ? rcu_read_lock_bh_held+0xb0/0xb0 ? lockdep_hardirqs_on_prepare+0x273/0x3e0 process_one_work+0x92b/0x1460 ? pwq_dec_nr_in_flight+0x330/0x330 ? rwlock_bug.part.0+0x90/0x90 worker_thread+0x95/0xe00 ? __kthread_parkme+0x115/0x1e0 ? process_one_work+0x1460/0x1460 kthread+0x3a1/0x480 ? set_kthread_struct+0x120/0x120 ret_from_fork+0x1f/0x30 The buggy address belongs to the page: page:ffffea000063c000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x18f00 head:ffffea000063c000 order:4 compound_mapcount:0 compound_pincount:0 flags: 0x100000000010000(head|node=0|zone=1) raw: 0100000000010000 0000000000000000 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 4, migratetype Unmovable, gfp_mask 0x40dc0(GFP_KERNEL|__GFP_COMP|__GFP_ZERO), pid 1896, ts 44510886600, free_ts 0 prep_new_page+0x1aa/0x240 get_page_from_freelist+0x159a/0x27c0 __alloc_pages+0x2da/0x6a0 alloc_pages+0xec/0x1e0 kmalloc_order+0x39/0xf0 kmalloc_order_trace+0x19/0x120 brcmf_cfg80211_attach+0x5c9/0x3fd0 brcmf_attach+0x389/0xd40 brcmf_usb_probe+0x12de/0x1690 usb_probe_interface+0x2aa/0x760 really_probe+0x205/0xb70 __driver_probe_device+0x311/0x4b0 driver_probe_device+0x4e/0x150 __device_attach_driver+0x1cc/0x2a0 bus_for_each_drv+0x156/0x1d0 __device_attach+0x23f/0x3a0 page_owner free stack trace missing Memory state around the buggy address: ffff888018f0fc80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888018f0fd00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888018f0fd80: 00 00 00 00 00 00 00 00 00 00 00 00 00 fe fe fe ^ ffff888018f0fe00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe ffff888018f0fe80: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe ================================================================== Reported-by: Dokyung Song Reported-by: Jisoo Jang Reported-by: Minsuk Kang Signed-off-by: Minsuk Kang --- .../net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c index ae9507dec74a..8390274a8ab1 100644 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c @@ -3298,6 +3298,13 @@ static s32 brcmf_inform_single_bss(struct brcmf_cfg80211_info *cfg, notify_ielen = le32_to_cpu(bi->ie_length); bss_data.signal = (s16)le16_to_cpu(bi->RSSI) * 100; + if ((unsigned long)notify_ie + notify_ielen - + (unsigned long)cfg->escan_info.escan_buf > BRCMF_ESCAN_BUF_SIZE) { + bphy_err(drvr, "Invalid information element offset: %u, length: %lu\n", + le16_to_cpu(bi->ie_offset), notify_ielen); + return -EINVAL; + } + brcmf_dbg(CONN, "bssid: %pM\n", bi->BSSID); brcmf_dbg(CONN, "Channel: %d(%d)\n", channel, freq); brcmf_dbg(CONN, "Capability: %X\n", notify_capability);