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From: Andrii Nakryiko <andrii.nakryiko@gmail.com>
To: Daniel Borkmann <daniel@iogearbox.net>
Cc: Alexei Starovoitov <alexei.starovoitov@gmail.com>,
	Martynas Pumputis <m@lambda.lt>, Joe Stringer <joe@wand.net.nz>,
	bpf <bpf@vger.kernel.org>, Networking <netdev@vger.kernel.org>
Subject: Re: [PATCH bpf-next 6/7] bpf: enable retrival of pid/tgid/comm from bpf cgroup hooks
Date: Fri, 27 Mar 2020 17:49:29 -0700
Message-ID: <CAEf4BzYjh++aorwBzgjdcWmRiw7GV4p=2avWqZu8S2Jdv3A3tQ@mail.gmail.com> (raw)
In-Reply-To: <18744744ed93c06343be8b41edcfd858706f39d7.1585323121.git.daniel@iogearbox.net>

On Fri, Mar 27, 2020 at 8:59 AM Daniel Borkmann <daniel@iogearbox.net> wrote:
>
> We already have the bpf_get_current_uid_gid() helper enabled, and
> given we now have perf event RB output available for connect(),
> sendmsg(), recvmsg() and bind-related hooks, add a trivial change
> to enable bpf_get_current_pid_tgid() and bpf_get_current_comm()
> as well.
>
> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
> ---

LGTM, there was probably never a good reason this wasn't available
from the very beginning :)

Might as well add bpf_get_current_uid_gid() if it's not there yet.

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

>  net/core/filter.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
>
> diff --git a/net/core/filter.c b/net/core/filter.c
> index 5cec3ac9e3dd..bb4a196c8809 100644
> --- a/net/core/filter.c
> +++ b/net/core/filter.c
> @@ -6018,6 +6018,10 @@ sock_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
>                 return &bpf_get_netns_cookie_sock_proto;
>         case BPF_FUNC_perf_event_output:
>                 return &bpf_event_output_data_proto;
> +       case BPF_FUNC_get_current_pid_tgid:
> +               return &bpf_get_current_pid_tgid_proto;
> +       case BPF_FUNC_get_current_comm:
> +               return &bpf_get_current_comm_proto;

So you are not adding it to bpf_base_func_proto() instead, because
that one can be used in BPF programs that don't have a valid current,
is that right? If yes, would it make sense to have a common
bpf_base_process_ctx_func_proto() function for cases where there is a
valid current and add all the functions there (including uid_gid and
whatever else makes sense?)

>  #ifdef CONFIG_CGROUPS
>         case BPF_FUNC_get_current_cgroup_id:
>                 return &bpf_get_current_cgroup_id_proto;
> @@ -6058,6 +6062,10 @@ sock_addr_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
>                 return &bpf_get_local_storage_proto;
>         case BPF_FUNC_perf_event_output:
>                 return &bpf_event_output_data_proto;
> +       case BPF_FUNC_get_current_pid_tgid:
> +               return &bpf_get_current_pid_tgid_proto;
> +       case BPF_FUNC_get_current_comm:
> +               return &bpf_get_current_comm_proto;
>  #ifdef CONFIG_CGROUPS
>         case BPF_FUNC_get_current_cgroup_id:
>                 return &bpf_get_current_cgroup_id_proto;
> --
> 2.21.0
>

  reply index

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-27 15:58 [PATCH bpf-next 0/7] Various improvements to cgroup helpers Daniel Borkmann
2020-03-27 15:58 ` [PATCH bpf-next 1/7] bpf: enable retrieval of socket cookie for bind/post-bind hook Daniel Borkmann
2020-03-27 15:58 ` [PATCH bpf-next 2/7] bpf: enable perf event rb output for bpf cgroup progs Daniel Borkmann
2020-03-27 15:58 ` [PATCH bpf-next 3/7] bpf: add netns cookie and enable it for bpf cgroup hooks Daniel Borkmann
2020-03-28  0:32   ` Andrii Nakryiko
2020-03-28  1:30     ` Daniel Borkmann
2020-03-28  1:48   ` Alexei Starovoitov
2020-03-28  2:16     ` Daniel Borkmann
2020-03-28  2:56       ` Alexei Starovoitov
2020-03-27 15:58 ` [PATCH bpf-next 4/7] bpf: allow to retrieve cgroup v1 classid from v2 hooks Daniel Borkmann
2020-03-28  0:41   ` Andrii Nakryiko
2020-03-28  1:56     ` Daniel Borkmann
2020-03-28 20:27       ` Andrii Nakryiko
2020-03-27 15:58 ` [PATCH bpf-next 5/7] bpf: enable bpf cgroup hooks to retrieve cgroup v2 and ancestor id Daniel Borkmann
2020-03-28  0:43   ` Andrii Nakryiko
2020-03-27 15:58 ` [PATCH bpf-next 6/7] bpf: enable retrival of pid/tgid/comm from bpf cgroup hooks Daniel Borkmann
2020-03-28  0:49   ` Andrii Nakryiko [this message]
2020-03-28  1:40     ` Daniel Borkmann
2020-03-27 15:58 ` [PATCH bpf-next 7/7] bpf: add selftest cases for ctx_or_null argument type Daniel Borkmann
2020-03-28  0:51   ` Andrii Nakryiko

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