On Fri, Oct 12, 2018 at 2:35 AM Jann Horn [off-list ref] wrote:

On Fri, Oct 12, 2018 at 1:40 AM Rick Edgecombe
[off-list ref] wrote:

quoted

This introduces a new rlimit, RLIMIT_MODSPACE, which limits the amount of
module space a user can use. The intention is to be able to limit module space
allocations that may come from un-privlidged users inserting e/BPF filters.

Note that in some configurations (iirc e.g. the default Ubuntu
config), normal users can use the subuid mechanism (the /etc/subuid
config file and the /usr/bin/newuidmap setuid helper) to gain access
to 65536 UIDs, which means that in such a configuration,
RLIMIT_MODSPACE*65537 is the actual limit for one user. (Same thing
applies to RLIMIT_MEMLOCK.)

Actually, I may have misremembered, perhaps it's not installed by
default - I just checked in a Ubuntu VM, and the newuidmap helper from
the uidmap package wasn't installed.