Re: [PATCH bpf-next 0/3] Always allow sleepable and fmod_ret programs on syscalls

[Leon Hwang <leon.hwang@linux.dev>]

Hi Viktor,

On 5/3/26 23:25, Viktor Malik wrote:
> Both sleepable and fmod_ret programs are only allowed on selected
> functions. For convenience, the error injection list was originally
> used.
> 
> When error injection is disabled, that list is empty and sleepable
> tracing programs, as well as fmod_ret programs, are effectively
> unavailable.
> 
> This patch series addresses the issue by at least enabling sleepable and
> fmod_ret programs on syscalls, if error injection is disabled.
> 

Could you please explain more about the purpose in cover letter?

I'm curious about enabling fmod_ret programs on syscalls, as they are
able to modify the retval of syscalls.

Thanks,
Leon

> Viktor Malik (3):
>   bpf: Always allow sleepable programs on syscalls
>   bpf: Always allow fmod_ret programs on syscalls
>   selftests/bpf: Move sleepable refcounted_kptr tests to syscalls
> 
>  kernel/bpf/verifier.c                         | 79 +++++++++++++++----
>  .../selftests/bpf/progs/refcounted_kptr.c     |  4 +-
>  .../bpf/progs/refcounted_kptr_fail.c          |  2 +-
>  3 files changed, 68 insertions(+), 17 deletions(-)
>