Re: [PATCH bpf-next 10/10] selftests/bpf: add build ID tests

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On Tue, Jul 9, 2024 at 1:43 PM Andrii Nakryiko <andrii@xxxxxxxxxx> wrote:
>
> Add a new set of tests validating behavior of capturing stack traces
> with build ID. We extend uprobe_multi target binary with ability to
> trigger uprobe (so that we can capture stack traces from it), but also
> we allow to force build ID data to be either resident or non-resident in
> memory. That way we can validate that in non-sleepable context we won't
> get build ID (as expected), but with sleepable uprobes we will get that
> build ID regardless of it being physically present in memory.
>
> Also, we add a small add-on linker script which reorders
> .note.gnu.build-id section and puts it after (big) .text section,
> putting build ID data outside of the very first page of ELF file. This
> will test all the relaxations we did in build ID parsing logic in kernel
> thanks to freader abstraction.
>
> Signed-off-by: Andrii Nakryiko <andrii@xxxxxxxxxx>
> ---
>  tools/testing/selftests/bpf/Makefile          |   5 +-
>  .../selftests/bpf/prog_tests/build_id.c       | 118 ++++++++++++++++++
>  .../selftests/bpf/progs/test_build_id.c       |  31 +++++
>  tools/testing/selftests/bpf/uprobe_multi.c    |  34 +++++
>  tools/testing/selftests/bpf/uprobe_multi.ld   |  11 ++
>  5 files changed, 197 insertions(+), 2 deletions(-)
>  create mode 100644 tools/testing/selftests/bpf/prog_tests/build_id.c
>  create mode 100644 tools/testing/selftests/bpf/progs/test_build_id.c
>  create mode 100644 tools/testing/selftests/bpf/uprobe_multi.ld
>

FYI for anyone that decided to not look at this patch set because BPF
CI build is failing. It's due to outdated libc headers that don't have
MADV_POPULATE_READ constant. I've fixed it up with the usual
#ifndef+#define+#endif block in selftests.

I'm not going to send another revision just to fix this up, I will
wait for feedback. Thanks!

> diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
> index e0b3887b3d2d..45f67e822f49 100644
> --- a/tools/testing/selftests/bpf/Makefile
> +++ b/tools/testing/selftests/bpf/Makefile
> @@ -762,9 +762,10 @@ $(OUTPUT)/veristat: $(OUTPUT)/veristat.o
>         $(call msg,BINARY,,$@)
>         $(Q)$(CC) $(CFLAGS) $(LDFLAGS) $(filter %.a %.o,$^) $(LDLIBS) -o $@
>

[...]





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