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

From: Greg Kroah-Hartman <[email-masked]>
Date: Thu, 21 Aug 2025 14:19:46 +0200

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 <[email-masked]>
> > 
> > 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.

How exactly are you building this?

thanks,

greg k-h