netdev - Re: [PATCH rfc v3 bpf-next 4/9] bpf, obj: allow . char as part of the name

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Date:   Thu, 14 Mar 2019 12:40:20 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     Alexei Starovoitov <ast@...nel.org>, bpf@...r.kernel.org,
        Networking <netdev@...r.kernel.org>,
        Joe Stringer <joe@...d.net.nz>,
        john fastabend <john.fastabend@...il.com>,
        Yonghong Song <yhs@...com>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>, tgraf@...g.ch,
        lmb@...udflare.com
Subject: Re: [PATCH rfc v3 bpf-next 4/9] bpf, obj: allow . char as part of the name

On Mon, Mar 11, 2019 at 2:51 PM Daniel Borkmann <daniel@...earbox.net> wrote:
>
> Trivial addition to allow '.' aside from '_' as "special" characters
> in the object name. Used to allow for substrings in maps from loader
> side such as ".bss", ".data", ".rodata", but could also be useful for
> other purposes.
>
> Signed-off-by: Daniel Borkmann <daniel@...earbox.net>

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

> ---
>  kernel/bpf/syscall.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
> index b5ba138351e1..04279747c092 100644
> --- a/kernel/bpf/syscall.c
> +++ b/kernel/bpf/syscall.c
> @@ -456,10 +456,10 @@ static int bpf_obj_name_cpy(char *dst, const char *src)
>         const char *end = src + BPF_OBJ_NAME_LEN;
>
>         memset(dst, 0, BPF_OBJ_NAME_LEN);
> -
> -       /* Copy all isalnum() and '_' char */
> +       /* Copy all isalnum(), '_' and '.' chars. */
>         while (src < end && *src) {
> -               if (!isalnum(*src) && *src != '_')
> +               if (!isalnum(*src) &&
> +                   *src != '_' && *src != '.')
>                         return -EINVAL;
>                 *dst++ = *src++;
>         }
> --
> 2.17.1
>