From patchwork Thu Oct 20 01:49:07 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dokyung Song X-Patchwork-Id: 13012541 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 16EF8C4332F for ; Thu, 20 Oct 2022 01:49:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231324AbiJTBtQ (ORCPT ); Wed, 19 Oct 2022 21:49:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41336 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229774AbiJTBtO (ORCPT ); Wed, 19 Oct 2022 21:49:14 -0400 Received: from mail-pf1-x432.google.com (mail-pf1-x432.google.com [IPv6:2607:f8b0:4864:20::432]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CA22B1D2985 for ; Wed, 19 Oct 2022 18:49:12 -0700 (PDT) Received: by mail-pf1-x432.google.com with SMTP id y191so18940029pfb.2 for ; Wed, 19 Oct 2022 18:49:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-disposition:mime-version:message-id:subject:cc:to:from:date :from:to:cc:subject:date:message-id:reply-to; bh=5nmHSvHQDMtAL2AOSYcWXUKkW2yXG3QfLswGnstPfn0=; b=qNomfsGJ7Dj7yJ8rhDiyoAIsIQ/nc5ZMtypsNaL5tNmiAGYb3/M857R+07zJUjUTdE fN731TmYP8y+fOz0nbhWA527/4A5dCCMkgWyFW/rxrTCMWpno+oC30fCx2p9OEfbdpiJ B2FGxkp2P1XsVIumx5QLm+Ez1m6JfmU1i6g8yh/fwdveojcR5B3DrhYQ2p1jO2m1jXS3 1F29wnY8QHyuCoEOTh7PYPLnd2eWztHLIAwKJ+3eySyDBD4movOVlGUg2KQEEGUnPwr8 brchQsMsFVOUBTi6qxz06UAlySHvUuAH2AU/TowLpF8+o7v4DJjrPh6yDe9Bt8+znAGX 7LWg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-disposition:mime-version:message-id:subject:cc:to:from:date :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=5nmHSvHQDMtAL2AOSYcWXUKkW2yXG3QfLswGnstPfn0=; b=AnDjf3btztrSJf6XcYZc7okwKIL6s6hdqyC3PF4NO3gWxS2VTzUBx0IJ6zbVYmzqFk bnJMtKApHfL8CM5IAgZiNMGsIyxvOx1z8wV56BbvwskpZUoexBKWmEINcIP+b09vEbmM 4Z6mHrPbQAbCss5Svcp5sziZY3mEmxllLxNNIU87TNQSOOBxZPXln6p9Rihob7y2Yjvc Ye3qd6G6hfYiPNeoCgbWdpuHh2iYOaXR5bwgyYUPQ4/fHFnKP5M2Rywr8S0t+WtuFQuv NswkiH6UwMrA/CBGwYjCiiq5GajoCyhxPnth42GonkMCGk63J/B7feYqtDkbXtaghuuZ +2vw== X-Gm-Message-State: ACrzQf20Y7+1rRhgHH4xotGbJOj8XGbL4xXDFQQ5TXwXdyBbz099Fsgs SWqLU6nUIgdcrBpVuSHVQ2lxzoIoV3I= X-Google-Smtp-Source: AMsMyM6kF6mT9mDhvjmeCKr/SJuVqJRaeKsG23+QvT607DZ9/tXkUfPEG2CocumHIJifVYfsX2e5fA== X-Received: by 2002:a63:8549:0:b0:46e:99b8:4b36 with SMTP id u70-20020a638549000000b0046e99b84b36mr1007232pgd.138.1666230551604; Wed, 19 Oct 2022 18:49:11 -0700 (PDT) Received: from laguna ([165.132.118.110]) by smtp.gmail.com with ESMTPSA id q15-20020a65684f000000b0044ba7b39c2asm10499653pgt.60.2022.10.19.18.49.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 19 Oct 2022 18:49:10 -0700 (PDT) Date: Thu, 20 Oct 2022 10:49:07 +0900 From: Dokyung Song To: linux-wireless@vger.kernel.org Cc: Jisoo Jang , Minsuk Kang Subject: [PATCH] brcmfmac: Fixes potential buffer overflow in 'brcmf_fweh_event_worker' Message-ID: <20221020014907.GA338234@laguna> MIME-Version: 1.0 Content-Disposition: inline Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org This patch fixes an intra-object buffer overflow in brcmfmac that occurs when the device provides a 'bsscfgidx' equal to or greater than the buffer size. The patch adds a check that leads to a safe failure if that is the case. Found by a modified version of syzkaller. UBSAN: array-index-out-of-bounds in drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c index 52 is out of range for type 'brcmf_if *[16]' CPU: 0 PID: 1898 Comm: kworker/0:2 Tainted: G O 5.14.0+ #132 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+0x57/0x7d ubsan_epilogue+0x5/0x40 __ubsan_handle_out_of_bounds+0x69/0x80 ? memcpy+0x39/0x60 brcmf_fweh_event_worker+0xae1/0xc00 ? 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+0x873/0x13e0 ? lock_release+0x640/0x640 ? pwq_dec_nr_in_flight+0x320/0x320 ? rwlock_bug.part.0+0x90/0x90 worker_thread+0x8b/0xd10 ? __kthread_parkme+0xd9/0x1d0 ? process_one_work+0x13e0/0x13e0 kthread+0x379/0x450 ? _raw_spin_unlock_irq+0x24/0x30 ? set_kthread_struct+0x100/0x100 ret_from_fork+0x1f/0x30 ================================================================================ general protection fault, probably for non-canonical address 0xe5601c0020023fff: 0000 [#1] SMP KASAN KASAN: maybe wild-memory-access in range [0x2b0100010011fff8-0x2b0100010011ffff] CPU: 0 PID: 1898 Comm: kworker/0:2 Tainted: G O 5.14.0+ #132 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 RIP: 0010:brcmf_fweh_call_event_handler.isra.0+0x42/0x100 Code: 89 f5 53 48 89 fb 48 83 ec 08 e8 79 0b 38 fe 48 85 ed 74 7e e8 6f 0b 38 fe 48 89 ea 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 8b 00 00 00 4c 8b 7d 00 44 89 e0 48 ba 00 00 00 RSP: 0018:ffffc9000259fbd8 EFLAGS: 00010207 RAX: dffffc0000000000 RBX: ffff888115d8cd50 RCX: 0000000000000000 RDX: 0560200020023fff RSI: ffffffff8304bc91 RDI: ffff888115d8cd50 RBP: 2b0100010011ffff R08: ffff888112340050 R09: ffffed1023549809 R10: ffff88811aa4c047 R11: ffffed1023549808 R12: 0000000000000045 R13: ffffc9000259fca0 R14: ffff888112340050 R15: ffff888112340000 FS: 0000000000000000(0000) GS:ffff88811aa00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000004053ccc0 CR3: 0000000112740000 CR4: 0000000000750ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 PKRU: 55555554 Call Trace: 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+0x873/0x13e0 ? lock_release+0x640/0x640 ? pwq_dec_nr_in_flight+0x320/0x320 ? rwlock_bug.part.0+0x90/0x90 worker_thread+0x8b/0xd10 ? __kthread_parkme+0xd9/0x1d0 ? process_one_work+0x13e0/0x13e0 kthread+0x379/0x450 ? _raw_spin_unlock_irq+0x24/0x30 ? set_kthread_struct+0x100/0x100 ret_from_fork+0x1f/0x30 Modules linked in: 88XXau(O) 88x2bu(O) ---[ end trace 41d302138f3ff55a ]--- RIP: 0010:brcmf_fweh_call_event_handler.isra.0+0x42/0x100 Code: 89 f5 53 48 89 fb 48 83 ec 08 e8 79 0b 38 fe 48 85 ed 74 7e e8 6f 0b 38 fe 48 89 ea 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 8b 00 00 00 4c 8b 7d 00 44 89 e0 48 ba 00 00 00 RSP: 0018:ffffc9000259fbd8 EFLAGS: 00010207 RAX: dffffc0000000000 RBX: ffff888115d8cd50 RCX: 0000000000000000 RDX: 0560200020023fff RSI: ffffffff8304bc91 RDI: ffff888115d8cd50 RBP: 2b0100010011ffff R08: ffff888112340050 R09: ffffed1023549809 R10: ffff88811aa4c047 R11: ffffed1023549808 R12: 0000000000000045 R13: ffffc9000259fca0 R14: ffff888112340050 R15: ffff888112340000 FS: 0000000000000000(0000) GS:ffff88811aa00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000004053ccc0 CR3: 0000000112740000 CR4: 0000000000750ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 PKRU: 55555554 Kernel panic - not syncing: Fatal exception Reported-by: Dokyung Song Reported-by: Jisoo Jang Reported-by: Minsuk Kang Signed-off-by: Dokyung Song Reviewed-by: Arend van Spriel --- drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c index bc3f4e4edcdf..e035e9c5a1fa 100644 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c @@ -255,10 +255,15 @@ static void brcmf_fweh_event_worker(struct work_struct *work) goto event_free; } - if (event->code == BRCMF_E_TDLS_PEER_EVENT) + if (event->code == BRCMF_E_TDLS_PEER_EVENT) { ifp = drvr->iflist[0]; - else + } else { + if (emsg.bsscfgidx >= BRCMF_MAX_IFS) { + bphy_err(drvr, "invalid bsscfg index: %u\n", emsg.bsscfgidx); + goto event_free; + } ifp = drvr->iflist[emsg.bsscfgidx]; + } err = brcmf_fweh_call_event_handler(drvr, ifp, event->code, &emsg, event->data); if (err) {