netdev - Re: [PATCH bpf-next v2 1/3] libbpf: use func name when pinning programs with LIBBPF_STRICT_SEC

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Date:   Wed, 20 Oct 2021 11:14:47 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Stanislav Fomichev <sdf@...gle.com>
Cc:     Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>
Subject: Re: [PATCH bpf-next v2 1/3] libbpf: use func name when pinning
 programs with LIBBPF_STRICT_SEC_NAME

On Tue, Oct 12, 2021 at 9:15 AM Stanislav Fomichev <sdf@...gle.com> wrote:
>
> We can't use section name anymore because they are not unique
> and pinning objects with multiple programs with the same
> progtype/secname will fail.
>
> Closes: https://github.com/libbpf/libbpf/issues/273
> Signed-off-by: Stanislav Fomichev <sdf@...gle.com>
> ---
>  tools/lib/bpf/libbpf.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
> index ae0889bebe32..d1646b32188f 100644
> --- a/tools/lib/bpf/libbpf.c
> +++ b/tools/lib/bpf/libbpf.c
> @@ -285,7 +285,7 @@ struct bpf_program {
>         size_t sub_insn_off;
>
>         char *name;
> -       /* sec_name with / replaced by _; makes recursive pinning
> +       /* name with / replaced by _; makes recursive pinning
>          * in bpf_object__pin_programs easier
>          */
>         char *pin_name;
> @@ -614,7 +614,13 @@ static char *__bpf_program__pin_name(struct bpf_program *prog)
>  {
>         char *name, *p;
>
> -       name = p = strdup(prog->sec_name);
> +       if (libbpf_mode & LIBBPF_STRICT_SEC_NAME)
> +               name = strdup(prog->name);
> +       else
> +               name = strdup(prog->sec_name);
> +
> +       p = name;
> +
>         while ((p = strchr(p, '/')))

I bet this will SIGSEGV if p is NULL? Can you please add a check and Fixes: tag?

>                 *p = '_';
>
> --
> 2.33.0.882.g93a45727a2-goog
>