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From: Lorenz Bauer <lmb@isovalent.com>
To: Andrii Nakryiko <andrii@kernel.org>
Cc: bpf@vger.kernel.org, ast@kernel.org, daniel@iogearbox.net,
	martin.lau@kernel.org, timo@incline.eu,
	robin.goegge@isovalent.com, kernel-team@meta.com
Subject: Re: [PATCH v4 bpf-next 14/19] bpf: relax log_buf NULL conditions when log_level>0 is requested
Date: Tue, 11 Apr 2023 11:44:17 +0100	[thread overview]
Message-ID: <CAN+4W8h8vGXTG1k7GO_6ZexOK3p3RDK0zwVg98vkRLcO0GvO7w@mail.gmail.com> (raw)
In-Reply-To: <20230406234205.323208-15-andrii@kernel.org>

On Fri, Apr 7, 2023 at 12:42 AM Andrii Nakryiko <andrii@kernel.org> wrote:
>
> Drop the log_size>0 and log_buf!=NULL condition when log_level>0. This
> allows users to request log_true_size of a full log without providing
> actual (even if small) log buffer. Verifier log handling code was mostly
> ready to handle NULL log->ubuf, so only few small changes were necessary
> to prevent NULL log->ubuf from causing problems.
>
> Note, that if user provided NULL log_buf with log_level>0 we don't
> consider this a log truncation, and thus won't return -ENOSPC.
>
> We also enforce that either (log_buf==NULL && log_size==0) or
> (log_buf!=NULL && log_size>0).
>
> Suggested-by: Lorenz Bauer <lmb@isovalent.com>
> Signed-off-by: Andrii Nakryiko <andrii@kernel.org>

Reviewed-by: Lorenz Bauer <lmb@isovalent.com>

  reply	other threads:[~2023-04-11 10:45 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-04-06 23:41 [PATCH v4 bpf-next 00/19] BPF verifier rotating log Andrii Nakryiko
2023-04-06 23:41 ` [PATCH v4 bpf-next 01/19] bpf: split off basic BPF verifier log into separate file Andrii Nakryiko
2023-04-11 10:43   ` Lorenz Bauer
2023-04-06 23:41 ` [PATCH v4 bpf-next 02/19] bpf: remove minimum size restrictions on verifier log buffer Andrii Nakryiko
2023-04-06 23:41 ` [PATCH v4 bpf-next 03/19] bpf: switch BPF verifier log to be a rotating log by default Andrii Nakryiko
2023-04-11 10:28   ` Lorenz Bauer
2023-04-06 23:41 ` [PATCH v4 bpf-next 04/19] libbpf: don't enforce unnecessary verifier log restrictions on libbpf side Andrii Nakryiko
2023-04-11 10:44   ` Lorenz Bauer
2023-04-06 23:41 ` [PATCH v4 bpf-next 05/19] veristat: add more veristat control over verifier log options Andrii Nakryiko
2023-04-06 23:41 ` [PATCH v4 bpf-next 06/19] selftests/bpf: add fixed vs rotating verifier log tests Andrii Nakryiko
2023-04-06 23:41 ` [PATCH v4 bpf-next 07/19] bpf: ignore verifier log reset in BPF_LOG_KERNEL mode Andrii Nakryiko
2023-04-06 23:41 ` [PATCH v4 bpf-next 08/19] bpf: fix missing -EFAULT return on user log buf error in btf_parse() Andrii Nakryiko
2023-04-06 23:41 ` [PATCH v4 bpf-next 09/19] bpf: avoid incorrect -EFAULT error in BPF_LOG_KERNEL mode Andrii Nakryiko
2023-04-06 23:41 ` [PATCH v4 bpf-next 10/19] bpf: simplify logging-related error conditions handling Andrii Nakryiko
2023-04-06 23:41 ` [PATCH v4 bpf-next 11/19] bpf: keep track of total log content size in both fixed and rolling modes Andrii Nakryiko
2023-04-11 10:44   ` Lorenz Bauer
2023-04-06 23:41 ` [PATCH v4 bpf-next 12/19] bpf: add log_true_size output field to return necessary log buffer size Andrii Nakryiko
2023-04-11 10:44   ` Lorenz Bauer
2023-04-06 23:41 ` [PATCH v4 bpf-next 13/19] bpf: simplify internal verifier log interface Andrii Nakryiko
2023-04-06 23:42 ` [PATCH v4 bpf-next 14/19] bpf: relax log_buf NULL conditions when log_level>0 is requested Andrii Nakryiko
2023-04-11 10:44   ` Lorenz Bauer [this message]
2023-04-06 23:42 ` [PATCH v4 bpf-next 15/19] libbpf: wire through log_true_size returned from kernel for BPF_PROG_LOAD Andrii Nakryiko
2023-04-06 23:42 ` [PATCH v4 bpf-next 16/19] libbpf: wire through log_true_size for bpf_btf_load() API Andrii Nakryiko
2023-04-06 23:42 ` [PATCH v4 bpf-next 17/19] selftests/bpf: add tests to validate log_true_size feature Andrii Nakryiko
2023-04-11 10:44   ` Lorenz Bauer
2023-04-06 23:42 ` [PATCH v4 bpf-next 18/19] selftests/bpf: add testing of log_buf==NULL condition for BPF_PROG_LOAD Andrii Nakryiko
2023-04-11 10:44   ` Lorenz Bauer
2023-04-06 23:42 ` [PATCH v4 bpf-next 19/19] selftests/bpf: add verifier log tests for BPF_BTF_LOAD command Andrii Nakryiko
2023-04-11 10:44   ` Lorenz Bauer
2023-04-11 14:03 ` [PATCH v4 bpf-next 00/19] BPF verifier rotating log Lorenz Bauer
2023-04-11 16:10 ` patchwork-bot+netdevbpf
2023-04-12 15:31 ` Lorenz Bauer
2023-04-12 17:03   ` Andrii Nakryiko

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