linux-kernel - Re: [PATCH v2 1/1] binder: report txn errors via generic netlink

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Message-ID: <2024101149-steadfast-skater-c567@gregkh>
Date: Fri, 11 Oct 2024 08:51:04 +0200
From: Greg KH <gregkh@...uxfoundation.org>
To: Li Li <dualli@...omium.org>
Cc: dualli@...gle.com, corbet@....net, arve@...roid.com, tkjos@...roid.com,
	maco@...roid.com, joel@...lfernandes.org, brauner@...nel.org,
	cmllamas@...gle.com, surenb@...gle.com, arnd@...db.de,
	masahiroy@...nel.org, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	hridya@...gle.com, smoreland@...gle.com, kernel-team@...roid.com
Subject: Re: [PATCH v2 1/1] binder: report txn errors via generic netlink

On Thu, Oct 10, 2024 at 11:44:27PM -0700, Li Li wrote:
> From: Li Li <dualli@...gle.com>
> 
> Frozen tasks can't process binder transactions, so sync binder
> transactions will fail with BR_FROZEN_REPLY and async binder
> transactions will be queued in the kernel async binder buffer.
> As these queued async transactions accumulates over time, the async
> buffer will eventually be running out, denying all new transactions
> after that with BR_FAILED_REPLY.
> 
> In addition to the above cases, different kinds of binder error codes
> might be returned to the sender. However, the core Linux, or Android,
> system administration process never knows what's actually happening.
> 
> This patch introduces the Linux generic netlink messages into the binder
> driver so that the Linux/Android system administration process can
> listen to important events and take corresponding actions, like stopping
> a broken app from attacking the OS by sending huge amount of spamming
> binder transactions.
> 
> To prevent making the already bloated binder.c even bigger, a new source
> file binder_genl.c is created to host those generic netlink code.
> 
> Signed-off-by: Li Li <dualli@...gle.com>
> ---
>  Documentation/admin-guide/binder_genl.rst |  69 ++++++

You add a file but not to the documentation build?  Did you test-build
the documentation to see where it shows up at?

thanks,

greg k-h