linux-kernel - [PATCH 0/3] Dynptr Verifier Adjustments

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Message-ID: <20230406004018.1439952-1-drosen@google.com>
Date:   Wed,  5 Apr 2023 17:40:15 -0700
From:   Daniel Rosenberg <drosen@...gle.com>
To:     bpf@...r.kernel.org
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>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        Shuah Khan <shuah@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Joanne Koong <joannelkoong@...il.com>,
        Mykola Lysenko <mykolal@...com>, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, kernel-team@...roid.com,
        Daniel Rosenberg <drosen@...gle.com>
Subject: [PATCH 0/3] Dynptr Verifier Adjustments

These patches relax a few verifier requirements around dynptrs.

I was unable to test the patch in 0003 due to unrelated issues compiling the
bpf selftests, but did run an equivalent local test program.

This is the issue I was running into:
progs/cgrp_ls_attach_cgroup.c:17:15: error: use of undeclared identifier 'BPF_MAP_TYPE_CGRP_STORAGE'; did you mean 'BPF_MAP_TYPE_CGROUP_STORAGE'?
        __uint(type, BPF_MAP_TYPE_CGRP_STORAGE);
                     ^~~~~~~~~~~~~~~~~~~~~~~~~
                     BPF_MAP_TYPE_CGROUP_STORAGE
/ssd/kernel/fuse-bpf/tools/testing/selftests/bpf/tools/include/bpf/bpf_helpers.h:13:39: note: expanded from macro '__uint'
#define __uint(name, val) int (*name)[val]
                                      ^
/ssd/kernel/fuse-bpf/tools/testing/selftests/bpf/tools/include/vmlinux.h:27892:2: note: 'BPF_MAP_TYPE_CGROUP_STORAGE' declared here
        BPF_MAP_TYPE_CGROUP_STORAGE = 19,
        ^
1 error generated.

Daniel Rosenberg (3):
  bpf: verifier: Accept dynptr mem as mem in helpers
  bpf: Allow NULL buffers in bpf_dynptr_slice(_rw)
  selftests/bpf: Test allowing NULL buffer in dynptr slice

 Documentation/bpf/kfuncs.rst                  | 23 ++++++++++++-
 kernel/bpf/helpers.c                          | 32 ++++++++++++-------
 kernel/bpf/verifier.c                         | 21 ++++++++++++
 .../testing/selftests/bpf/prog_tests/dynptr.c |  1 +
 .../selftests/bpf/progs/dynptr_success.c      | 21 ++++++++++++
 5 files changed, 85 insertions(+), 13 deletions(-)


base-commit: 5af607a861d43ffff830fc1890033e579ec44799
-- 
2.40.0.577.gac1e443424-goog