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Date: Wed, 03 Aug 2022 08:23:34 +0200
From: Paolo Abeni <pabeni@...hat.com>
To: Eric Dumazet <eric.dumazet@...il.com>,
"David S . Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>
Cc: netdev <netdev@...r.kernel.org>,
Eric Dumazet <edumazet@...gle.com>,
Bernard F6BVP <f6bvp@...e.fr>,
Duoming Zhou <duoming@....edu.cn>
Subject: Re: [PATCH net] ax25: fix incorrect dev_tracker usage
On Wed, 2022-07-27 at 22:18 -0700, Eric Dumazet wrote:
> From: Eric Dumazet <edumazet@...gle.com>
>
> While investigating a separate rose issue [1], and enabling
> CONFIG_NET_DEV_REFCNT_TRACKER=y, Bernard reported an orthogonal ax25 issue [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@free.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_tracker_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_core 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_bit 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 intel_soc_dts_iosf snd_seq sysimgblt ecdh_generic fb_sys_fops rapl libarc4 processor_thermal_device intel_cstate processor_thermal_rfim cec snd_timer ecc snd_seq_device cfg80211 processor_thermal_mbox mei_me processor_thermal_rapl mei rc_core at24 snd intel_pch_thermal intel_rapl_common ttm soundcore int340x_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 [last 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: 0000000000000000
> [ 205.799014] RDX: 0000000000000001 RSI: 0000000000000282 RDI: 00000000ffffffff
> [ 205.799016] RBP: ffffaf5281073a10 R08: 0000000000000003 R09: fffffffffffd5618
> [ 205.799019] R10: 0000000000ffff10 R11: 000000000000000f R12: ffff9a0bc53384d0
> [ 205.799022] R13: 0000000000000282 R14: 00000000ae000001 R15: 0000000000000001
> [ 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: 00000000001706e0
> [ 205.799033] Call Trace:
> [ 205.799035] <TASK>
> [ 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: 00000000000000e7
> [ 205.799287] RAX: ffffffffffffffda RBX: 00007ff6b8215a00 RCX: 00007ff6b80eaca1
> [ 205.799290] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001
> [ 205.799293] RBP: 0000000000000001 R08: ffffffffffffff80 R09: 0000000000000028
> [ 205.799295] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff6b8215a00
> [ 205.799298] R13: 0000000000000000 R14: 00007ff6b821aee8 R15: 00007ff6b821af00
> [ 205.799304] </TASK>
>
> Fixes: feef318c855a ("ax25: fix UAF bugs of net_device caused by rebinding operation")
> Reported-by: Bernard F6BVP <f6bvp@...e.fr>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Cc: Duoming Zhou <duoming@....edu.cn>
> ---
> 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 a427a05672e2aab158efd44381fe2190d9cb8969..f8cf3629a41934f96f33e5d70ad90cc8ae796d38 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;
I'm sorry for the [too] late feedback, but it looks like this patch
forgot to remove the old/unused tracker from ax25_dev, or am I missing
something?
Thanks!
Paolo
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