linux-kernel - Re: [PATCHv5 bpf-next 05/13] bpf: Allow return values 0 and 1 for uprobe/kprobe session

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Message-ID: <Zvv2iBQPl5Nt-tqz@krava>
Date: Tue, 1 Oct 2024 15:18:00 +0200
From: Jiri Olsa <olsajiri@...il.com>
To: Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc: Oleg Nesterov <oleg@...hat.com>, Peter Zijlstra <peterz@...radead.org>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>, bpf@...r.kernel.org,
	Martin KaFai Lau <kafai@...com>, Song Liu <songliubraving@...com>,
	Yonghong Song <yhs@...com>,
	John Fastabend <john.fastabend@...il.com>,
	KP Singh <kpsingh@...omium.org>,
	Stanislav Fomichev <sdf@...ichev.me>, Hao Luo <haoluo@...gle.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org
Subject: Re: [PATCHv5 bpf-next 05/13] bpf: Allow return values 0 and 1 for
 uprobe/kprobe session

On Mon, Sep 30, 2024 at 02:36:28PM -0700, Andrii Nakryiko wrote:
> On Sun, Sep 29, 2024 at 1:58 PM Jiri Olsa <jolsa@...nel.org> wrote:
> >
> > The uprobe and kprobe session program can return only 0 or 1,
> > instruct verifier to check for that.
> >
> > Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> > ---
> >  kernel/bpf/verifier.c | 10 ++++++++++
> >  1 file changed, 10 insertions(+)
> >
> 
> Do we need Fixes: tag?

right, for kprobe session, will add

thanks,
jirka

> 
> Acked-by: Andrii Nakryiko <andrii@...nel.org>
> 
> 
> > diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
> > index 7d9b38ffd220..c4d7b7369259 100644
> > --- a/kernel/bpf/verifier.c
> > +++ b/kernel/bpf/verifier.c
> > @@ -15910,6 +15910,16 @@ static int check_return_code(struct bpf_verifier_env *env, int regno, const char
> >                         return -ENOTSUPP;
> >                 }
> >                 break;
> > +       case BPF_PROG_TYPE_KPROBE:
> > +               switch (env->prog->expected_attach_type) {
> > +               case BPF_TRACE_KPROBE_SESSION:
> > +               case BPF_TRACE_UPROBE_SESSION:
> > +                       range = retval_range(0, 1);
> > +                       break;
> > +               default:
> > +                       return 0;
> > +               }
> > +               break;
> >         case BPF_PROG_TYPE_SK_LOOKUP:
> >                 range = retval_range(SK_DROP, SK_PASS);
> >                 break;
> > --
> > 2.46.1
> >