Re: [bpf-next v5 2/2] bpf: Add tests for bpf_copy_from_user_str kfunc

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On Thu, Aug 15, 2024 at 4:28 AM Jordan Rome <linux@xxxxxxxxxxxxxx> wrote:
>
> This adds tests for both the happy path and
> the error path.
>
> Signed-off-by: Jordan Rome <linux@xxxxxxxxxxxxxx>
> ---
>  .../selftests/bpf/prog_tests/attach_probe.c   |  8 ++--
>  .../selftests/bpf/prog_tests/read_vsyscall.c  |  1 +
>  .../selftests/bpf/progs/read_vsyscall.c       |  9 ++++-
>  .../selftests/bpf/progs/test_attach_probe.c   | 38 +++++++++++++++++--
>  4 files changed, 49 insertions(+), 7 deletions(-)
>

As I mentioned in the first patch, it would be better to have a bit
more extensive testing. All those rare conditions:

  - dst_size is zero
  - dst_size is one
  - string is empty
  - string exactly fits
  - string is truncated
  - plus various error conditions.

> diff --git a/tools/testing/selftests/bpf/prog_tests/attach_probe.c b/tools/testing/selftests/bpf/prog_tests/attach_probe.c
> index 7175af39134f..329c7862b52d 100644
> --- a/tools/testing/selftests/bpf/prog_tests/attach_probe.c
> +++ b/tools/testing/selftests/bpf/prog_tests/attach_probe.c
> @@ -283,9 +283,11 @@ static void test_uprobe_sleepable(struct test_attach_probe *skel)
>         trigger_func3();
>

[...]





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