Add cimfs differ and snapshotter

Details about CimFs project are discussed in #8346

Signed-off-by: Amit Barve <ambarve@microsoft.com>

vendor/github.com/Microsoft/hcsshim/internal/jobobject/iocp.go

@@ -4,6 +4,7 @@ package jobobject
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"sync"
 	"unsafe"
@@ -59,7 +60,7 @@ func pollIOCP(ctx context.Context, iocpHandle windows.Handle) {
 				}).Warn("failed to parse job object message")
 				continue
 			}
-			if err := msq.Enqueue(notification); err == queue.ErrQueueClosed {
+			if err := msq.Enqueue(notification); errors.Is(err, queue.ErrQueueClosed) {
 				// Write will only return an error when the queue is closed.
 				// The only time a queue would ever be closed is when we call `Close` on
 				// the job it belongs to which also removes it from the jobMap, so something

vendor/github.com/Microsoft/hcsshim/internal/jobobject/jobobject.go

@@ -374,7 +374,7 @@ func (job *JobObject) Pids() ([]uint32, error) {
 		return []uint32{}, nil
 	}
 
-	if err != winapi.ERROR_MORE_DATA {
+	if err != winapi.ERROR_MORE_DATA { //nolint:errorlint
 		return nil, fmt.Errorf("failed initial query for PIDs in job object: %w", err)
 	}
 

vendor/github.com/Microsoft/hcsshim/internal/jobobject/limits.go

@@ -143,6 +143,13 @@ func (job *JobObject) SetCPUAffinity(affinityBitMask uint64) error {
 		return err
 	}
 	info.BasicLimitInformation.LimitFlags |= uint32(windows.JOB_OBJECT_LIMIT_AFFINITY)
+
+	// We really, really shouldn't be running on 32 bit, but just in case (and to satisfy CodeQL) ...
+	const maxUintptr = ^uintptr(0)
+	if affinityBitMask > uint64(maxUintptr) {
+		return fmt.Errorf("affinity bitmask (%d) exceeds max allowable value (%d)", affinityBitMask, maxUintptr)
+	}
+
 	info.BasicLimitInformation.Affinity = uintptr(affinityBitMask)
 	return job.setExtendedInformation(info)
 }