linux-kernel - Re: [PATCH RFC bpf-next v3 02/16] bpf/verifier: introduce in

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Message-ID: <qajvrsg3neipbcmktzuxm7dpee6qaobgvq35bccupayoa6avff@56no2hfgitkk>
Date: Fri, 23 Feb 2024 20:46:04 +0100
From: Benjamin Tissoires <bentiss@...nel.org>
To: Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc: Alexei Starovoitov <ast@...nel.org>, 
	Daniel Borkmann <daniel@...earbox.net>, John Fastabend <john.fastabend@...il.com>, 
	Andrii Nakryiko <andrii@...nel.org>, Martin KaFai Lau <martin.lau@...ux.dev>, 
	Eduard Zingerman <eddyz87@...il.com>, Song Liu <song@...nel.org>, 
	Yonghong Song <yonghong.song@...ux.dev>, KP Singh <kpsingh@...nel.org>, 
	Stanislav Fomichev <sdf@...gle.com>, Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>, 
	Jiri Kosina <jikos@...nel.org>, Benjamin Tissoires <benjamin.tissoires@...hat.com>, 
	Jonathan Corbet <corbet@....net>, Shuah Khan <shuah@...nel.org>, bpf <bpf@...r.kernel.org>, 
	LKML <linux-kernel@...r.kernel.org>, "open list:HID CORE LAYER" <linux-input@...r.kernel.org>, 
	"open list:DOCUMENTATION" <linux-doc@...r.kernel.org>, 
	"open list:KERNEL SELFTEST FRAMEWORK" <linux-kselftest@...r.kernel.org>
Subject: Re: [PATCH RFC bpf-next v3 02/16] bpf/verifier: introduce
 in_sleepable() helper

On Feb 22 2024, Alexei Starovoitov wrote:
> On Wed, Feb 21, 2024 at 8:25 AM Benjamin Tissoires <bentiss@...nel.org> wrote:
> > @@ -18193,7 +18198,7 @@ static int resolve_pseudo_ldimm64(struct bpf_verifier_env *env)
> >                                 return -E2BIG;
> >                         }
> >
> > -                       if (env->prog->aux->sleepable)
> > +                       if (in_sleepable(env))
> >                                 atomic64_inc(&map->sleepable_refcnt);
> 
> this one doesn't look correct.
> The verifier didn't start its main loop when resolve_pseudo_ldimm64()
> is called.
> It also loses symmetry with other sleepable_refcnt operations
> in syscall.c and core.c
> 
> I reverted this hunk and applied patches 1,2,3
> with minor edits, like removing unnecessary parens in patch 3,
> and patch subject rewords.

Thanks a lot. I'll work on the rest of the series next week.

Cheers,
Benjamin