netdev - Re: [PATCH bpf-next 0/4] CO-RE candidate matching fix and tracing test

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Date:   Fri, 13 Mar 2020 23:36:22 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Andrii Nakryiko <andriin@...com>, bpf@...r.kernel.org,
        netdev@...r.kernel.org, ast@...com
Cc:     andrii.nakryiko@...il.com, kernel-team@...com
Subject: Re: [PATCH bpf-next 0/4] CO-RE candidate matching fix and tracing
 test

On 3/13/20 6:23 PM, Andrii Nakryiko wrote:
> This patch set fixes bug in CO-RE relocation candidate finding logic, which
> currently allows matching against forward declarations, functions, and other
> named types, even though it makes no sense to even attempt. As part of
> verifying the fix, add test using vmlinux.h with preserve_access_index
> attribute and utilizing struct pt_regs heavily to trace nanosleep syscall
> using 5 different types of tracing BPF programs.
> 
> This test also demonstrated problems using struct pt_regs in syscall
> tracepoints and required a new set of macro, which were added in patch #3 into
> bpf_tracing.h.
> 
> Patch #1 fixes annoying issue with selftest failure messages being out of
> sync.
> 
> v1->v2:
> - drop unused handle__probed() function (Martin).
> 
> Andrii Nakryiko (4):
>    selftests/bpf: ensure consistent test failure output
>    libbpf: ignore incompatible types with matching name during CO-RE
>      relocation
>    libbpf: provide CO-RE variants of PT_REGS macros
>    selftests/bpf: add vmlinux.h selftest exercising tracing of syscalls
> 
>   tools/lib/bpf/bpf_tracing.h                   | 103 ++++++++++++++++++
>   tools/lib/bpf/libbpf.c                        |   4 +
>   tools/testing/selftests/bpf/Makefile          |   7 +-
>   .../selftests/bpf/prog_tests/vmlinux.c        |  43 ++++++++
>   .../selftests/bpf/progs/test_vmlinux.c        |  84 ++++++++++++++
>   tools/testing/selftests/bpf/test_progs.c      |  10 +-
>   tools/testing/selftests/bpf/test_progs.h      |   8 +-
>   7 files changed, 249 insertions(+), 10 deletions(-)
>   create mode 100644 tools/testing/selftests/bpf/prog_tests/vmlinux.c
>   create mode 100644 tools/testing/selftests/bpf/progs/test_vmlinux.c

Applied, thanks!