zeekayandHanzo Dev 3da05638df State the ZAP wire of every urpc payload ...

urpc encodes with encoding/json, which walks the payload on every call: a
realistic control.ExecArgs costs 7084ns and 10 allocations to cross. ZAP
reads a field at a constant offset out of the buffer that arrived, so the
same payload is 740ns and one allocation -- but only if the offsets are
stated, and a stated offset that is wrong is silent corruption rather than
a compile error. So state them from the types themselves.

//tools/zap reflects over the payloads at build time and writes the wire
as Go source with the offsets as constants. It lives inside Bazel because
pkg/sentry/control cannot be imported from outside it: the *_go_proto
packages it depends on have no source in the tree.

Six payloads had no layout to state. A map, an interface and a type from
another module have no offsets, so each is answered in the type:

  SaveOpts.Metadata and StartContainerArgs.InitialCgroups/Limits cross as
  lists of pairs; boot.Route.Destination restates net.IPNet as Subnet;
  OpenMountArgs restates the OCI mount fields the call actually uses;
  StartArgs.Spec and SinkConfig.Config carry their documents as the bytes
  they arrived as; MetricsRegistrationResponse carries the protocol
  buffer the same way; and seccheck's session options become a type
  instead of a map of any.

ExecArgs and MetricsExportData still have none: ExecArgs holds live
kernel objects behind an interface, and MetricsExportData reaches a
prometheus snapshot whose labels are a map.

Co-authored-by: Hanzo Dev <[email protected]>

2026-09-22 23:10:33 -07:00

..

BUILD

State the ZAP wire of every urpc payload

2026-09-22 23:10:33 -07:00

mapping_set_test.go

Replace reflect.DeepEqual with [slices/maps].Equal.

2024-05-12 21:20:18 -07:00

mapping_set.go

Automated rollback of changelist 964518735

2026-08-18 11:04:14 -07:00

memmap.go

mm: implement MAP_FIXED_NOREPLACE

2026-08-10 20:44:34 +00:00

zap.go

State the ZAP wire of every urpc payload

2026-09-22 23:10:33 -07:00