From: Eduard Zingerman <eddyz87@gmail.com>
To: Andrii Nakryiko <andrii.nakryiko@gmail.com>,
Alexei Starovoitov <alexei.starovoitov@gmail.com>
Cc: Andrii Nakryiko <andrii@kernel.org>, bpf <bpf@vger.kernel.org>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Martin KaFai Lau <martin.lau@kernel.org>,
Kernel Team <kernel-team@meta.com>
Subject: Re: [PATCH bpf-next 3/7] bpf: enforce precision for r0 on callback return
Date: Thu, 09 Nov 2023 20:03:54 +0200 [thread overview]
Message-ID: <e7493d856dcfdfae27404680025d7e7759686952.camel@gmail.com> (raw)
In-Reply-To: <CAEf4BzZDMHvBYKc+=jwdXBE36E=r8n5zzpvpzy5fTtL56d+2Cg@mail.gmail.com>
On Thu, 2023-11-09 at 10:01 -0800, Andrii Nakryiko wrote:
[...]
> > Just like Ed I was also initially confused by this.
> > As you said check_return_code() has the same problem.
> > I think the issue this patch and similar in check_return_code()
> > should be fixing is the case where one state went through
> > ret code checking, but another state with potentially out-of-range
> > r0 got state pruned since r0 wasn't marked precise.
>
> Right.
>
> > Not sure how hard it would be to come up with a selftest for such a scenario.
>
> Yep, I'll think of something. Lots of tests to come up with :)
Hm, range argument is convincing, thank you.
next prev parent reply other threads:[~2023-11-09 18:03 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-31 5:03 [PATCH bpf-next 0/7] Complete BPF verifier precision tracking support for register spills Andrii Nakryiko
2023-10-31 5:03 ` [PATCH bpf-next 1/7] bpf: use common jump (instruction) history across all states Andrii Nakryiko
2023-11-09 15:20 ` Eduard Zingerman
2023-11-09 16:13 ` Alexei Starovoitov
2023-11-09 17:28 ` Andrii Nakryiko
2023-11-09 19:29 ` Alexei Starovoitov
2023-11-09 19:49 ` Andrii Nakryiko
2023-11-09 20:39 ` Andrii Nakryiko
2023-11-09 22:05 ` Alexei Starovoitov
2023-11-09 22:57 ` Andrii Nakryiko
2023-11-11 4:29 ` Andrii Nakryiko
2023-10-31 5:03 ` [PATCH bpf-next 2/7] bpf: support non-r10 register spill/fill to/from stack in precision tracking Andrii Nakryiko
2023-11-09 15:20 ` Eduard Zingerman
2023-11-09 17:20 ` Andrii Nakryiko
2023-11-09 18:20 ` Eduard Zingerman
2023-11-10 5:48 ` Andrii Nakryiko
2023-11-12 1:57 ` Andrii Nakryiko
2023-11-12 14:05 ` Eduard Zingerman
2023-10-31 5:03 ` [PATCH bpf-next 3/7] bpf: enforce precision for r0 on callback return Andrii Nakryiko
2023-11-09 15:20 ` Eduard Zingerman
2023-11-09 17:32 ` Andrii Nakryiko
2023-11-09 17:38 ` Eduard Zingerman
2023-11-09 17:50 ` Andrii Nakryiko
2023-11-09 17:58 ` Alexei Starovoitov
2023-11-09 18:01 ` Andrii Nakryiko
2023-11-09 18:03 ` Eduard Zingerman [this message]
2023-11-09 18:00 ` Eduard Zingerman
2023-10-31 5:03 ` [PATCH bpf-next 4/7] bpf: fix check for attempt to corrupt spilled pointer Andrii Nakryiko
2023-11-09 15:20 ` Eduard Zingerman
2023-10-31 5:03 ` [PATCH bpf-next 5/7] bpf: preserve STACK_ZERO slots on partial reg spills Andrii Nakryiko
2023-11-09 15:20 ` Eduard Zingerman
2023-11-09 17:37 ` Andrii Nakryiko
2023-11-09 17:54 ` Eduard Zingerman
2023-10-31 5:03 ` [PATCH bpf-next 6/7] bpf: preserve constant zero when doing partial register restore Andrii Nakryiko
2023-11-09 15:20 ` Eduard Zingerman
2023-11-09 17:41 ` Andrii Nakryiko
2023-11-09 19:34 ` Eduard Zingerman
2023-10-31 5:03 ` [PATCH bpf-next 7/7] bpf: track aligned STACK_ZERO cases as imprecise spilled registers Andrii Nakryiko
2023-10-31 5:22 ` Andrii Nakryiko
2023-11-01 7:56 ` Jiri Olsa
2023-11-01 16:27 ` Andrii Nakryiko
2023-11-02 9:54 ` Jiri Olsa
2023-11-09 15:21 ` Eduard Zingerman
2023-11-09 17:43 ` Andrii Nakryiko
2023-11-09 17:44 ` Eduard Zingerman
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