tree 18d4f5066979b368a72571e29b63c1b92ada6d09
parent bb8a80a8364c73489716d4a482c9df13ad52f2fa
author Nick Maniscalco <maniscalco@fuchsia.infra.roller.google.com> 1647545381 +0000
committer Copybara-Service <copybara-worker@google.com> 1647545448 -0700

[roll] Roll fuchsia [kernel][port] Limit the number of port observers

This change limits the number of observers associated with a port.
When the limit is exceeded, a policy exception is raised for the
triggering process, which will result in its termination.  The default
value is UINT64_MAX (effectively unlimited).

The purpose of this change is to prevent a misbehaving program from
compromising system performance and stability.

Add new job policy code ZX_EXCP_POLICY_CODE_TOO_MANY_OBSERVERS.

Add new mini-process command MINIP_CMD_WAIT_ASYNC to facilitate
testing.

Add core-test PortTest.TooManyObservers to test the limit.  Note, this
test is disabled since the default is "no limit".  A future CL will
set a default limit and re-enable the test.

Original-Bug: 91615
Test: fx core-tests --gtest_filter=PortTest.TooManyObservers
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/654904
Original-Revision: 7dc038443df3fe6c10ef0ecc392a356bf404f19b
GitOrigin-RevId: 1b89315d4ff0e236fc05c77987682d7aef3ab8ec
Change-Id: I450fde99a3446b01258e916ccf2de4c8c197b8bd