netdev - Re: [PATCH wireless] wifi: wilc1000: Fix UAF in wilc_netdev

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <877czj6l5u.fsf@kernel.org>
Date:   Fri, 25 Nov 2022 18:42:05 +0200
From:   Kalle Valo <kvalo@...nel.org>
To:     <Ajay.Kathat@...rochip.com>
Cc:     <zhangxiaoxu5@...wei.com>, <linux-wireless@...r.kernel.org>,
        <netdev@...r.kernel.org>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <Claudiu.Beznea@...rochip.com>
Subject: Re: [PATCH wireless] wifi: wilc1000: Fix UAF in wilc_netdev_cleanup() when iterator the RCU list

<Ajay.Kathat@...rochip.com> writes:

> On 24/11/22 20:43, Zhang Xiaoxu wrote:
>
>  EXTERNAL EMAIL: Do not click links or open attachments unless you know the
>  content is safe
>
> There is a UAF read when remove the wilc1000_spi module:
>
>  BUG: KASAN: use-after-free in wilc_netdev_cleanup.cold+0xc4/0xe0 [wilc1000]
>  Read of size 8 at addr ffff888116846900 by task rmmod/386
>
>  CPU: 2 PID: 386 Comm: rmmod Tainted: G                 N 6.1.0-rc6+ #8
>  Call Trace:
>   dump_stack_lvl+0x68/0x85
>   print_report+0x16c/0x4a3
>   kasan_report+0x95/0x190
>   wilc_netdev_cleanup.cold+0xc4/0xe0
>   wilc_bus_remove+0x52/0x60
>   spi_remove+0x46/0x60
>   device_remove+0x73/0xc0
>   device_release_driver_internal+0x12d/0x210
>   driver_detach+0x84/0x100
>   bus_remove_driver+0x90/0x120
>   driver_unregister+0x4f/0x80
>   __x64_sys_delete_module+0x2fc/0x440
>   do_syscall_64+0x38/0x90
>   entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> Since set 'needs_free_netdev=true' when initialize the net device, the
> net device will be freed when unregister, then use the freed 'vif' to
> find the next will UAF read.
>
> Did you test this behaviour on the real device. I am seeing a kernel
> crash when the module is unloaded after the connection with an AP. As
> I see, "vif_list" is used to maintain the interface list, so even when
> one interface is removed, another element is fetched from the
> "vif_list", not using the freed "vif"

Ajay, please don't use HTML as our lists drop those.

-- 
https://patchwork.kernel.org/project/linux-wireless/list/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches