netdev - Re: [PATCH v20 3/5] binder: introduce transaction reports via netlink

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Message-ID: <ddbf8e90-3fbb-4747-8e45-c931a0f02935@leemhuis.info>
Date: Thu, 21 Aug 2025 15:00:50 +0200
From: Thorsten Leemhuis <linux@...mhuis.info>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Carlos Llamas <cmllamas@...gle.com>
Cc: Li Li <dualli@...gle.com>, Tiffany Yang <ynaffit@...gle.com>,
 John Stultz <jstultz@...gle.com>, Shai Barack <shayba@...gle.com>,
 Thiébaud Weksteen <tweek@...gle.com>,
 kernel-team@...roid.com, linux-kernel@...r.kernel.org,
 "David S. Miller" <davem@...emloft.net>,
 Joel Fernandes <joelagnelf@...dia.com>, Todd Kjos <tkjos@...roid.com>,
 Arve Hjønnevåg <arve@...roid.com>,
 Donald Hunter <donald.hunter@...il.com>,
 Christian Brauner <brauner@...nel.org>, Eric Dumazet <edumazet@...gle.com>,
 "open list:NETWORKING [GENERAL]" <netdev@...r.kernel.org>,
 Martijn Coenen <maco@...roid.com>, Stephen Rothwell <sfr@...b.auug.org.au>,
 Linux Next Mailing List <linux-next@...r.kernel.org>,
 Jakub Kicinski <kuba@...nel.org>,
 Linux kernel regressions list <regressions@...ts.linux.dev>,
 Alice Ryhl <aliceryhl@...gle.com>, Suren Baghdasaryan <surenb@...gle.com>,
 Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>
Subject: Re: [PATCH v20 3/5] binder: introduce transaction reports via netlink

On 21.08.25 14:19, Greg Kroah-Hartman wrote:
> On Thu, Aug 21, 2025 at 10:49:09AM +0200, Thorsten Leemhuis wrote:
>> On 27.07.25 20:29, Carlos Llamas wrote:
>>> From: Li Li <dualli@...gle.com>
>>>
>>> Introduce a generic netlink multicast event to report binder transaction
>>> failures to userspace. This allows subscribers to monitor these events
>>> and take appropriate actions, such as stopping a misbehaving application
>>> that is spamming a service with huge amount of transactions.
>>>
>>> The multicast event contains full details of the failed transactions,
>>> including the sender/target PIDs, payload size and specific error code.
>>> This interface is defined using a YAML spec, from which the UAPI and
>>> kernel headers and source are auto-generated.
>>
>> It seems to me like this patch (which showed up in -next today after
>> Greg merged it) caused a build error for me in my daily -next builds
>> for Fedora when building tools/net/ynl:
>>
>> """
>> make[1]: Entering directory '/home/kbuilder/ark-vanilla/linux-knurd42/tools/net/ynl/lib'
>> gcc -std=gnu11 -O2 -W -Wall -Wextra -Wno-unused-parameter -Wshadow   -c -MMD -c -o ynl.o ynl.c
>>         AR ynl.a
>> make[1]: Leaving directory '/home/kbuilder/ark-vanilla/linux-knurd42/tools/net/ynl/lib'
>> make[1]: Entering directory '/home/kbuilder/ark-vanilla/linux-knurd42/tools/net/ynl/generated'
>>         GEN binder-user.c
>> Traceback (most recent call last):
>>   File "/home/kbuilder/ark-vanilla/linux-knurd42/tools/net/ynl/generated/../pyynl/ynl_gen_c.py", line 3673, in <module>
>>     main()
>>     ~~~~^^
>>   File "/home/kbuilder/ark-vanilla/linux-knurd42/tools/net/ynl/generated/../pyynl/ynl_gen_c.py", line 3382, in main
>>     parsed = Family(args.spec, exclude_ops)
>>   File "/home/kbuilder/ark-vanilla/linux-knurd42/tools/net/ynl/generated/../pyynl/ynl_gen_c.py", line 1205, in __init__
>>     super().__init__(file_name, exclude_ops=exclude_ops)
>>     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>>   File "/home/kbuilder/ark-vanilla/linux-knurd42/tools/net/ynl/pyynl/lib/nlspec.py", line 462, in __init__
>>     jsonschema.validate(self.yaml, schema)
>>     ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
>>   File "/usr/lib/python3.13/site-packages/jsonschema/validators.py", line 1307, in validate
>>     raise error
>> jsonschema.exceptions.ValidationError: 'from_pid' does not match '^[0-9a-z-]+$'
>>
>> Failed validating 'pattern' in schema['properties']['attribute-sets']['items']['properties']['attributes']['items']['properties']['name']:
>>     {'pattern': '^[0-9a-z-]+$', 'type': 'string'}
>>
>> On instance['attribute-sets'][0]['attributes'][2]['name']:
>>     'from_pid'
>> make[1]: *** [Makefile:48: binder-user.c] Error 1
>> make[1]: Leaving directory '/home/kbuilder/ark-vanilla/linux-knurd42/tools/net/ynl/generated'
>> make: *** [Makefile:25: generated] Error 2
>> """
> 
> Odd, this works for me.

Hmmm, happened on various Fedora releases and archs in Fedora's coprs
buildsys for me today. And with a local Fedora 41 x86_64 install, too;
in the latter case (just verified) both when checking out next-20250821
and 63740349eba78f ("binder: introduce transaction reports via netlink")
from -next.

> How exactly are you building this?

Just "cd tools/net/ynl; make".

Ciao, Thorsten