netdev - Re: [PATCH v2 bpf-next 2/3] libbpf: make global data internal arrays mmap()-able, if possible

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAEf4Bzb_49EvfBP0P-jo5=Rg9cP26_hSCztK4HcUMHD-4fPA=g@mail.gmail.com>
Date:   Mon, 11 Nov 2019 18:11:21 -0800
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     Andrii Nakryiko <andriin@...com>, bpf <bpf@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Kernel Team <kernel-team@...com>
Subject: Re: [PATCH v2 bpf-next 2/3] libbpf: make global data internal arrays
 mmap()-able, if possible

On Mon, Nov 11, 2019 at 10:41 AM Jakub Kicinski
<jakub.kicinski@...ronome.com> wrote:
>
> On Sat, 9 Nov 2019 00:06:31 -0800, Andrii Nakryiko wrote:
> > +static int bpf_object__probe_array_mmap(struct bpf_object *obj)
> > +{
> > +     struct bpf_create_map_attr attr = {
> > +             .map_type = BPF_MAP_TYPE_ARRAY,
> > +             .map_flags = BPF_F_MMAPABLE,
> > +             .key_size = sizeof(int),
> > +             .value_size = sizeof(int),
> > +             .max_entries = 1,
> > +     };
> > +     int fd = bpf_create_map_xattr(&attr);
> > +
> > +     if (fd >= 0) {
>
> The point of the empty line between variable declarations and code in
> the Linux coding style is to provide a visual separation between
> variables and code.
>
> If you call a complex function in variable init and then check for
> errors in the code that really breaks that principle.

I'll split declaration and initialization, no problem

>
> > +             obj->caps.array_mmap = 1;
> > +             close(fd);
> > +             return 1;
> > +     }
> > +
> > +     return 0;
> > +}
>