Re: [PATCH_v4.1_3/3] Make core_pattern support namespace

[Aleksa Sarai]

> Currently, each container shared one copy of coredump setting
> with the host system, if host system changed the setting, each
> running containers will be affected.
> Same story happened when container changed core_pattern, both
> host and other container will be affected.
>
> For container based on namespace design, it is good to allow
> each container keeping their own coredump setting.

From what I can see, this is basically setting a per-pidns core_pattern 
(which is hierarchically applied). I'm not sure this actually solves the 
more general problem (that usermode helper settings aren't generally 
namespace-aware) -- and what happens if you have processes in the same 
pidns that have different mount namespaces?

If we _had_ to do it like this I would think it makes more sense to pin 
it to mountns, but I was under the impression that someone was working 
on making usermode helpers play nicer with namespaces.

Just my $0.02.

--
Aleksa Sarai
Software Engineer (Containers)
SUSE Linux GmbH
https://www.cyphar.com/