From mboxrd@z Thu Jan 1 00:00:00 1970 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 7FEE0C00140 for ; Mon, 15 Aug 2022 21:23:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345479AbiHOVXr (ORCPT ); Mon, 15 Aug 2022 17:23:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37454 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344947AbiHOVRi (ORCPT ); Mon, 15 Aug 2022 17:17:38 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 34EF6E0FF9; Mon, 15 Aug 2022 12:20:54 -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 B6A5660EF0; Mon, 15 Aug 2022 19:20:53 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B1813C433C1; Mon, 15 Aug 2022 19:20:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1660591253; bh=alkqNoVEuZH4FmZPEVVM7SNB9OYHmAev1RY7fyrIPCQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=i0ZAprHThy1q+7vdJq9901xVGodcvCvwhbYzRUUyZ3o6jQ6nYN0rgMjWwA3KSEvf6 Ab/Jaz/g9GfO2+CRCA9pjptNrgN/iwVgDRagbxEK7mk78xTbbMYSnrpVDi1tJscE76 /8sYSeTndOIR7lrmqG5TBLuBsIetVkIR6sWxNQ8g= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Bernard F6BVP , Eric Dumazet , Duoming Zhou , Jakub Kicinski , Sasha Levin Subject: [PATCH 5.18 0520/1095] ax25: fix incorrect dev_tracker usage Date: Mon, 15 Aug 2022 19:58:39 +0200 Message-Id: <20220815180451.058379786@linuxfoundation.org> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20220815180429.240518113@linuxfoundation.org> References: <20220815180429.240518113@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Eric Dumazet [ Upstream commit d7c4c9e075f8cc6d88d277bc24e5d99297f03c06 ] While investigating a separate rose issue [1], and enabling CONFIG_NET_DEV_REFCNT_TRACKER=3Dy, Bernard reported an orthogonal ax25 issu= e [2] An ax25_dev can be used by one (or many) struct ax25_cb. We thus need different dev_tracker, one per struct ax25_cb. After this patch is applied, we are able to focus on rose. [1] https://lore.kernel.org/netdev/fb7544a1-f42e-9254-18cc-c9b071f4ca70@fre= e.fr/ [2] [ 205.798723] reference already released. [ 205.798732] allocated in: [ 205.798734] ax25_bind+0x1a2/0x230 [ax25] [ 205.798747] __sys_bind+0xea/0x110 [ 205.798753] __x64_sys_bind+0x18/0x20 [ 205.798758] do_syscall_64+0x5c/0x80 [ 205.798763] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 205.798768] freed in: [ 205.798770] ax25_release+0x115/0x370 [ax25] [ 205.798778] __sock_release+0x42/0xb0 [ 205.798782] sock_close+0x15/0x20 [ 205.798785] __fput+0x9f/0x260 [ 205.798789] ____fput+0xe/0x10 [ 205.798792] task_work_run+0x64/0xa0 [ 205.798798] exit_to_user_mode_prepare+0x18b/0x190 [ 205.798804] syscall_exit_to_user_mode+0x26/0x40 [ 205.798808] do_syscall_64+0x69/0x80 [ 205.798812] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 205.798827] ------------[ cut here ]------------ [ 205.798829] WARNING: CPU: 2 PID: 2605 at lib/ref_tracker.c:136 ref_track= er_free.cold+0x60/0x81 [ 205.798837] Modules linked in: rose netrom mkiss ax25 rfcomm cmac algif_= hash algif_skcipher af_alg bnep snd_hda_codec_hdmi nls_iso8859_1 i915 rtw88= _8821ce rtw88_8821c x86_pkg_temp_thermal rtw88_pci intel_powerclamp rtw88_c= ore snd_hda_codec_realtek snd_hda_codec_generic ledtrig_audio coretemp snd_= hda_intel kvm_intel snd_intel_dspcfg mac80211 snd_hda_codec kvm i2c_algo_bi= t drm_buddy drm_dp_helper btusb drm_kms_helper snd_hwdep btrtl snd_hda_core= btbcm joydev crct10dif_pclmul btintel crc32_pclmul ghash_clmulni_intel mei= _hdcp btmtk intel_rapl_msr aesni_intel bluetooth input_leds snd_pcm crypto_= simd syscopyarea processor_thermal_device_pci_legacy sysfillrect cryptd int= el_soc_dts_iosf snd_seq sysimgblt ecdh_generic fb_sys_fops rapl libarc4 pro= cessor_thermal_device intel_cstate processor_thermal_rfim cec snd_timer ecc= snd_seq_device cfg80211 processor_thermal_mbox mei_me processor_thermal_ra= pl mei rc_core at24 snd intel_pch_thermal intel_rapl_common ttm soundcore i= nt340x_thermal_zone video [ 205.798948] mac_hid acpi_pad sch_fq_codel ipmi_devintf ipmi_msghandler = drm msr parport_pc ppdev lp parport ramoops pstore_blk reed_solomon pstore_= zone efi_pstore ip_tables x_tables autofs4 hid_generic usbhid hid i2c_i801 = i2c_smbus r8169 xhci_pci ahci libahci realtek lpc_ich xhci_pci_renesas [las= t unloaded: ax25] [ 205.798992] CPU: 2 PID: 2605 Comm: ax25ipd Not tainted 5.18.11-F6BVP #3 [ 205.798996] Hardware name: To be filled by O.E.M. To be filled by O.E.M.= /CK3, BIOS 5.011 09/16/2020 [ 205.798999] RIP: 0010:ref_tracker_free.cold+0x60/0x81 [ 205.799005] Code: e8 d2 01 9b ff 83 7b 18 00 74 14 48 c7 c7 2f d7 ff 98 = e8 10 6e fc ff 8b 7b 18 e8 b8 01 9b ff 4c 89 ee 4c 89 e7 e8 5d fd 07 00 <0f= > 0b b8 ea ff ff ff e9 30 05 9b ff 41 0f b6 f7 48 c7 c7 a0 fa 4e [ 205.799008] RSP: 0018:ffffaf5281073958 EFLAGS: 00010286 [ 205.799011] RAX: 0000000080000000 RBX: ffff9a0bd687ebe0 RCX: 00000000000= 00000 [ 205.799014] RDX: 0000000000000001 RSI: 0000000000000282 RDI: 00000000fff= fffff [ 205.799016] RBP: ffffaf5281073a10 R08: 0000000000000003 R09: fffffffffff= d5618 [ 205.799019] R10: 0000000000ffff10 R11: 000000000000000f R12: ffff9a0bc53= 384d0 [ 205.799022] R13: 0000000000000282 R14: 00000000ae000001 R15: 00000000000= 00001 [ 205.799024] FS: 0000000000000000(0000) GS:ffff9a0d0f300000(0000) knlGS:= 0000000000000000 [ 205.799028] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 205.799031] CR2: 00007ff6b8311554 CR3: 000000001ac10004 CR4: 00000000001= 706e0 [ 205.799033] Call Trace: [ 205.799035] [ 205.799038] ? ax25_dev_device_down+0xd9/0x1b0 [ax25] [ 205.799047] ? ax25_device_event+0x9f/0x270 [ax25] [ 205.799055] ? raw_notifier_call_chain+0x49/0x60 [ 205.799060] ? call_netdevice_notifiers_info+0x52/0xa0 [ 205.799065] ? dev_close_many+0xc8/0x120 [ 205.799070] ? unregister_netdevice_many+0x13d/0x890 [ 205.799073] ? unregister_netdevice_queue+0x90/0xe0 [ 205.799076] ? unregister_netdev+0x1d/0x30 [ 205.799080] ? mkiss_close+0x7c/0xc0 [mkiss] [ 205.799084] ? tty_ldisc_close+0x2e/0x40 [ 205.799089] ? tty_ldisc_hangup+0x137/0x210 [ 205.799092] ? __tty_hangup.part.0+0x208/0x350 [ 205.799098] ? tty_vhangup+0x15/0x20 [ 205.799103] ? pty_close+0x127/0x160 [ 205.799108] ? tty_release+0x139/0x5e0 [ 205.799112] ? __fput+0x9f/0x260 [ 205.799118] ax25_dev_device_down+0xd9/0x1b0 [ax25] [ 205.799126] ax25_device_event+0x9f/0x270 [ax25] [ 205.799135] raw_notifier_call_chain+0x49/0x60 [ 205.799140] call_netdevice_notifiers_info+0x52/0xa0 [ 205.799146] dev_close_many+0xc8/0x120 [ 205.799152] unregister_netdevice_many+0x13d/0x890 [ 205.799157] unregister_netdevice_queue+0x90/0xe0 [ 205.799161] unregister_netdev+0x1d/0x30 [ 205.799165] mkiss_close+0x7c/0xc0 [mkiss] [ 205.799170] tty_ldisc_close+0x2e/0x40 [ 205.799173] tty_ldisc_hangup+0x137/0x210 [ 205.799178] __tty_hangup.part.0+0x208/0x350 [ 205.799184] tty_vhangup+0x15/0x20 [ 205.799188] pty_close+0x127/0x160 [ 205.799193] tty_release+0x139/0x5e0 [ 205.799199] __fput+0x9f/0x260 [ 205.799203] ____fput+0xe/0x10 [ 205.799208] task_work_run+0x64/0xa0 [ 205.799213] do_exit+0x33b/0xab0 [ 205.799217] ? __handle_mm_fault+0xc4f/0x15f0 [ 205.799224] do_group_exit+0x35/0xa0 [ 205.799228] __x64_sys_exit_group+0x18/0x20 [ 205.799232] do_syscall_64+0x5c/0x80 [ 205.799238] ? handle_mm_fault+0xba/0x290 [ 205.799242] ? debug_smp_processor_id+0x17/0x20 [ 205.799246] ? fpregs_assert_state_consistent+0x26/0x50 [ 205.799251] ? exit_to_user_mode_prepare+0x49/0x190 [ 205.799256] ? irqentry_exit_to_user_mode+0x9/0x20 [ 205.799260] ? irqentry_exit+0x33/0x40 [ 205.799263] ? exc_page_fault+0x87/0x170 [ 205.799268] ? asm_exc_page_fault+0x8/0x30 [ 205.799273] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 205.799277] RIP: 0033:0x7ff6b80eaca1 [ 205.799281] Code: Unable to access opcode bytes at RIP 0x7ff6b80eac77. [ 205.799283] RSP: 002b:00007fff6dfd4738 EFLAGS: 00000246 ORIG_RAX: 000000= 00000000e7 [ 205.799287] RAX: ffffffffffffffda RBX: 00007ff6b8215a00 RCX: 00007ff6b80= eaca1 [ 205.799290] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 00000000000= 00001 [ 205.799293] RBP: 0000000000000001 R08: ffffffffffffff80 R09: 00000000000= 00028 [ 205.799295] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff6b82= 15a00 [ 205.799298] R13: 0000000000000000 R14: 00007ff6b821aee8 R15: 00007ff6b82= 1af00 [ 205.799304] Fixes: feef318c855a ("ax25: fix UAF bugs of net_device caused by rebinding = operation") Reported-by: Bernard F6BVP Signed-off-by: Eric Dumazet Cc: Duoming Zhou Link: https://lore.kernel.org/r/20220728051821.3160118-1-eric.dumazet@gmail= .com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- include/net/ax25.h | 1 + net/ax25/af_ax25.c | 4 ++-- 2 files changed, 3 insertions(+), 2 deletions(-) diff --git a/include/net/ax25.h b/include/net/ax25.h index a427a05672e2..f8cf3629a419 100644 --- a/include/net/ax25.h +++ b/include/net/ax25.h @@ -236,6 +236,7 @@ typedef struct ax25_cb { ax25_address source_addr, dest_addr; ax25_digi *digipeat; ax25_dev *ax25_dev; + netdevice_tracker dev_tracker; unsigned char iamdigi; unsigned char state, modulus, pidincl; unsigned short vs, vr, va; diff --git a/net/ax25/af_ax25.c b/net/ax25/af_ax25.c index 4c7030ed8d33..5b5363c99ed5 100644 --- a/net/ax25/af_ax25.c +++ b/net/ax25/af_ax25.c @@ -1065,7 +1065,7 @@ static int ax25_release(struct socket *sock) del_timer_sync(&ax25->t3timer); del_timer_sync(&ax25->idletimer); } - dev_put_track(ax25_dev->dev, &ax25_dev->dev_tracker); + dev_put_track(ax25_dev->dev, &ax25->dev_tracker); ax25_dev_put(ax25_dev); } =20 @@ -1146,7 +1146,7 @@ static int ax25_bind(struct socket *sock, struct sock= addr *uaddr, int addr_len) =20 if (ax25_dev) { ax25_fillin_cb(ax25, ax25_dev); - dev_hold_track(ax25_dev->dev, &ax25_dev->dev_tracker, GFP_ATOMIC); + dev_hold_track(ax25_dev->dev, &ax25->dev_tracker, GFP_ATOMIC); } =20 done: --=20 2.35.1