linux-kernel - Re: [PATCH] driver/android/binderfs: fix race for binderfs' devices list

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Message-ID: <aCron3VfqAfRAfXs@e129823.arm.com>
Date: Mon, 19 May 2025 09:15:27 +0100
From: Yeoreum Yun <yeoreum.yun@....com>
To: Carlos Llamas <cmllamas@...gle.com>
Cc: gregkh@...uxfoundation.org, arve@...roid.com, tkjos@...roid.com,
	maco@...roid.com, joel@...lfernandes.org, brauner@...nel.org,
	mllamas@...gle.com, surenb@...gle.com, linux-kernel@...r.kernel.org,
	Yeoreum Yun <yeoreun.yun@....com>, Yunseong Kim <ysk@...lloc.com>
Subject: Re: [PATCH] driver/android/binderfs: fix race for binderfs' devices
 list

Hi Carlos,

> On Tue, May 13, 2025 at 06:47:19PM +0100, Yeoreum Yun wrote:
> > binderfs' devices list is global list and can be accesed by multi-thread
> > while unmount binder device.
> > Since there is no proper locking, it can meet datarace problem.
> > for example it's one of case reported UAF while binderfs_evict_inode()
> > removes binder device:
> >
> > sudo ./stress-ng --binderfs 8 --binderfs-ops 10000 -t 15 \
> >   --pathological --timestamp --tz --syslog --perf --no-rand-seed \
> >   --times --metrics --klog-check --status 5 -x smi -v --interrupts --change-cpu
>
> I just found this by chance (there is a typo on my email). Note this was
> already fixed here:
> https://lore.kernel.org/all/20250324132427.922495-1-dmantipov@yandex.ru/

Thanks. I didn't know that :)

--
Sincerely,
Yeoreum Yun