netdev - Re: [PATCH bpf-next] selftests/bpf: Fix test_attach

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Date:   Wed, 18 Dec 2019 21:52:55 -0800
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Alexei Starovoitov <ast@...nel.org>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Daniel Borkmann <daniel@...earbox.net>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Kernel Team <kernel-team@...com>
Subject: Re: [PATCH bpf-next] selftests/bpf: Fix test_attach_probe

On Wed, Dec 18, 2019 at 6:04 PM Alexei Starovoitov <ast@...nel.org> wrote:
>
> Fix two issues in test_attach_probe:
> 1. it was not able to parse /proc/self/maps beyond the first line,
>    since %s means parse string until white space.
> 2. offset has to be accounted for otherwise uprobed address is incorrect.
>
> Fixes: 1e8611bbdfc9 ("selftests/bpf: add kprobe/uprobe selftests")
> Signed-off-by: Alexei Starovoitov <ast@...nel.org>
> ---

Thanks for fixing!

Acked-by: Andrii Nakryiko <andriin@...com>

>  tools/testing/selftests/bpf/prog_tests/attach_probe.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/tools/testing/selftests/bpf/prog_tests/attach_probe.c b/tools/testing/selftests/bpf/prog_tests/attach_probe.c
> index 5ed90ede2f1d..a0ee87c8e1ea 100644
> --- a/tools/testing/selftests/bpf/prog_tests/attach_probe.c
> +++ b/tools/testing/selftests/bpf/prog_tests/attach_probe.c
> @@ -3,7 +3,7 @@
>  #include "test_attach_probe.skel.h"
>
>  ssize_t get_base_addr() {
> -       size_t start;
> +       size_t start, offset;
>         char buf[256];
>         FILE *f;
>
> @@ -11,10 +11,11 @@ ssize_t get_base_addr() {
>         if (!f)
>                 return -errno;
>
> -       while (fscanf(f, "%zx-%*x %s %*s\n", &start, buf) == 2) {
> +       while (fscanf(f, "%zx-%*x %s %zx %*[^\n]\n",

never new [^<chars>] is possible, very nice!

> +                     &start, buf, &offset) == 3) {
>                 if (strcmp(buf, "r-xp") == 0) {
>                         fclose(f);
> -                       return start;
> +                       return start - offset;
>                 }
>         }
>
> --
> 2.23.0
>