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Received: from sslproxy01.your-server.de ([78.46.139.224]) by www62.your-server.de with esmtpsa (TLS1.3) tls TLS_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1tH45w-0008DS-0j; Fri, 29 Nov 2024 17:43:52 +0100 Received: from [178.197.249.40] (helo=[192.168.1.114]) by sslproxy01.your-server.de with esmtpsa (TLS1.3) tls TLS_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1tH45u-000CoW-2w; Fri, 29 Nov 2024 17:43:51 +0100 Message-ID: <6cb6d9e6-bc7a-4915-ba98-e52f94c7d9c3@iogearbox.net> Date: Fri, 29 Nov 2024 17:43:50 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH bpf-next v4 2/2] bpf: Refactor bpf_tracing_func_proto() and remove bpf_get_probe_write_proto() To: Marco Elver , Alexei Starovoitov , Andrii Nakryiko Cc: Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Nikola Grcevski , bpf@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org References: <20241129090040.2690691-1-elver@google.com> <20241129090040.2690691-2-elver@google.com> Content-Language: en-US From: Daniel Borkmann Autocrypt: addr=daniel@iogearbox.net; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Authenticated-Sender: daniel@iogearbox.net X-Virus-Scanned: Clear (ClamAV 0.103.10/27472/Fri Nov 29 10:38:16 2024) On 11/29/24 9:59 AM, Marco Elver wrote: > With bpf_get_probe_write_proto() no longer printing a message, we can > avoid it being a special case with its own permission check. > > Refactor bpf_tracing_func_proto() similar to bpf_base_func_proto() to > have a section conditional on bpf_token_capable(CAP_SYS_ADMIN), where > the proto for bpf_probe_write_user() is returned. Finally, remove the > unnecessary bpf_get_probe_write_proto(). > > This simplifies the code, and adding additional CAP_SYS_ADMIN-only > helpers in future avoids duplicating the same CAP_SYS_ADMIN check. > > Suggested-by: Andrii Nakryiko > Signed-off-by: Marco Elver > Acked-by: Jiri Olsa Given the abuse that has been done with this helper, my preference is we don't encourage wider use via bpf_token_capable.. but fair enough, as long as it stays behind security_locked_down. Acked-by: Daniel Borkmann