Re: [PATCH] sysctl: Fix proc_do_large_bitmap for large input buffers

[Luis Chamberlain]

On Wed, Feb 20, 2019 at 05:35:04PM -0600, Eric Sandeen wrote:
> Here's a pretty hacky test script to test this code via
> ip_local_reserved_ports

Thanks Eric!

So /proc/sys/net/ipv4/ip_local_reserved_ports is a production knob, and
if we wanted to stress test it with a selftest it could break other self
tests or change the system behaviour. Because of this we have now have
lib/test_sysctl.c, and we test this with the script:

tools/testing/selftests/sysctl/sysctl.sh

Any chance you can extend lib/test_sysctl.c with a new respective bitmap
knob, and add a respective test? This will ensure we don't regress
later. 0-day runs sysctl.sh so it should catch any regressions in the
future.

If you can think of other ways to test the knob that would be great too.

  Luis