From: John Fastabend <john.fastabend@gmail.com>
To: Andrii Nakryiko <andrii@kernel.org>,
bpf@vger.kernel.org, netdev@vger.kernel.org,
paul@paul-moore.com, brauner@kernel.org
Cc: linux-fsdevel@vger.kernel.org,
linux-security-module@vger.kernel.org, keescook@chromium.org,
kernel-team@meta.com, sargun@sargun.me
Subject: RE: [PATCH bpf-next 5/8] libbpf: wire up token_fd into feature probing logic
Date: Mon, 11 Dec 2023 13:44:10 -0800 [thread overview]
Message-ID: <657782aa61b9e_edaa2082b@john.notmuch> (raw)
In-Reply-To: <20231207185443.2297160-6-andrii@kernel.org>
Andrii Nakryiko wrote:
> Adjust feature probing callbacks to take into account optional token_fd.
> In unprivileged contexts, some feature detectors would fail to detect
> kernel support just because BPF program, BPF map, or BTF object can't be
> loaded due to privileged nature of those operations. So when BPF object
> is loaded with BPF token, this token should be used for feature probing.
>
> This patch is setting support for this scenario, but we don't yet pass
> non-zero token FD. This will be added in the next patch.
>
> We also switched BPF cookie detector from using kprobe program to
> tracepoint one, as tracepoint is somewhat less dangerous BPF program
> type and has higher likelihood of being allowed through BPF token in the
> future. This change has no effect on detection behavior.
>
> Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
> ---
Acked-by: John Fastabend <john.fastabend@gmail.com>
next prev parent reply other threads:[~2023-12-11 21:44 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-07 18:54 [PATCH bpf-next 0/8] BPF token support in libbpf's BPF object Andrii Nakryiko
2023-12-07 18:54 ` [PATCH bpf-next 1/8] bpf: fail BPF_TOKEN_CREATE if no delegation option was set on BPF FS Andrii Nakryiko
2023-12-08 21:49 ` Christian Brauner
2023-12-08 22:42 ` Andrii Nakryiko
2023-12-11 21:33 ` John Fastabend
2023-12-07 18:54 ` [PATCH bpf-next 2/8] libbpf: split feature detectors definitions from cached results Andrii Nakryiko
2023-12-11 21:38 ` John Fastabend
2023-12-07 18:54 ` [PATCH bpf-next 3/8] libbpf: further decouple feature checking logic from bpf_object Andrii Nakryiko
2023-12-10 15:31 ` Eduard Zingerman
2023-12-11 18:20 ` Andrii Nakryiko
2023-12-11 21:41 ` John Fastabend
2023-12-11 22:50 ` Andrii Nakryiko
2023-12-07 18:54 ` [PATCH bpf-next 4/8] libbpf: move feature detection code into its own file Andrii Nakryiko
2023-12-11 21:41 ` John Fastabend
2023-12-07 18:54 ` [PATCH bpf-next 5/8] libbpf: wire up token_fd into feature probing logic Andrii Nakryiko
2023-12-11 21:44 ` John Fastabend [this message]
2023-12-07 18:54 ` [PATCH bpf-next 6/8] libbpf: wire up BPF token support at BPF object level Andrii Nakryiko
2023-12-11 22:56 ` John Fastabend
2023-12-12 0:05 ` Andrii Nakryiko
2023-12-12 0:26 ` John Fastabend
2023-12-07 18:54 ` [PATCH bpf-next 7/8] selftests/bpf: add BPF object loading tests with explicit token passing Andrii Nakryiko
2023-12-11 22:59 ` John Fastabend
2023-12-07 18:54 ` [PATCH bpf-next 8/8] selftests/bpf: add tests for BPF object load with implicit token Andrii Nakryiko
2023-12-11 23:00 ` John Fastabend
2023-12-10 15:30 ` [PATCH bpf-next 0/8] BPF token support in libbpf's BPF object Eduard Zingerman
2023-12-11 18:21 ` Andrii Nakryiko
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