lkml.org 
[lkml]   [2018]   [Mar]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCH net-next] modules: allow modprobe load regular elf binaries
Date
On 6 Mar 2018, at 11:12, Linus Torvalds wrote:

> On Mon, Mar 5, 2018 at 5:34 PM, Alexei Starovoitov <ast@kernel.org>
> wrote:
>> As the first step in development of bpfilter project [1] the
>> request_module()
>> code is extended to allow user mode helpers to be invoked. Idea is
>> that
>> user mode helpers are built as part of the kernel build and installed
>> as
>> traditional kernel modules with .ko file extension into distro
>> specified
>> location, such that from a distribution point of view, they are no
>> different
>> than regular kernel modules. Thus, allow request_module() logic to
>> load such
>> user mode helper (umh) modules via:
> [,,]
>
> I like this, but I have one request: can we make sure that this action
> is visible in the system messages?
>
> When we load a regular module, at least it shows in lsmod afterwards,
> although I have a few times wanted to really see module load as an
> event in the logs too.
>
> When we load a module that just executes a user program, and there is
> no sign of it in the module list, I think we *really* need to make
> that event show to the admin some way.
>
> .. and yes, maybe we'll need to rate-limit the messages, and maybe it
> turns out that I'm entirely wrong and people will hate the messages
> after they get used to the concept of these pseudo-modules, but
> particularly for the early implementation when this is a new thing, I
> really want a message like
>
> executed user process xyz-abc as a pseudo-module
>
> or something in dmesg.
>
> I do *not* want this to be a magical way to hide things.

Especially early on, this makes a lot of sense. But I wanted to plug
bps and the hopefully growing set of bpf introspection tools:

https://github.com/iovisor/bcc/blob/master/introspection/bps_example.txt

Long term these are probably a good place to tell the admin what's going
on.

-chris

\
 
 \ /
  Last update: 2018-03-07 00:44    [W:0.289 / U:1.136 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site