thaloco/banger
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daemon: persist teardown fallbacks and reject unsafe import paths

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Preserve cleanup after daemon restarts and harden OCI and tar imports
against filenames that debugfs cannot encode safely.

Mirror tap, loop, and dm teardown identity onto VM.Runtime, teach
cleanup and reconcile to fall back to those persisted fields when
handles.json is missing or corrupt, and clear the recovery state on
stop, error, and delete paths.

Reject debugfs-hostile entry names during flattening and in
ApplyOwnership itself, then add regression coverage for corrupt
handles.json recovery and unsafe import paths.

Verified with targeted go tests, make lint-go, make lint-shell, and
make build.
This commit is contained in:
Thales Maciel 2026-04-23 16:21:59 -03:00
parent 86a56fedb3
commit d743a8ba4b
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GPG key ID: 33112E6833C34679
15 changed files with 272 additions and 81 deletions
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11
internal/daemon/vm_lifecycle_steps.go
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@ -213,7 +213,7 @@ func (s *VMService) buildStartSteps(op *operationLog, sc *startContext) []startS
sc.live.COWLoop = snapHandles.COWLoop
sc.live.DMName = snapHandles.DMName
sc.live.DMDev = snapHandles.DMDev
s.setVMHandles(*sc.vm, *sc.live)
s.setVMHandles(sc.vm, *sc.live)
// Fields that used to land next to the (now-deleted)
// cleanupOnErr closure. They belong with the DM
// snapshot because that's the first step producing
@ -282,10 +282,7 @@ func (s *VMService) buildStartSteps(op *operationLog, sc *startContext) []startS
return err
}
sc.live.TapDevice = tap
s.setVMHandles(*sc.vm, *sc.live)
// Mirror onto VM.Runtime for NAT teardown resilience
// across daemon crashes — see vm.Runtime.TapDevice docs.
sc.vm.Runtime.TapDevice = tap
s.setVMHandles(sc.vm, *sc.live)
return nil
},
undo: func(ctx context.Context, sc *startContext) error {
@ -360,11 +357,11 @@ func (s *VMService) buildStartSteps(op *operationLog, sc *startContext) []startS
// PID so the undo can kill it; use a fresh ctx since
// the request ctx may be cancelled by now.
sc.live.PID = s.net.resolveFirecrackerPID(context.Background(), machine, sc.apiSock)
s.setVMHandles(*sc.vm, *sc.live)
s.setVMHandles(sc.vm, *sc.live)
return err
}
sc.live.PID = s.net.resolveFirecrackerPID(context.Background(), machine, sc.apiSock)
s.setVMHandles(*sc.vm, *sc.live)
s.setVMHandles(sc.vm, *sc.live)
op.debugStage("firecracker_started", "pid", sc.live.PID)
return nil
},