Prevent overflow of runc exit code.

It's possible for the Status field of runc.ExitError to be set to -1, in
which case conversion to uint32 results in the error message to say that
the container exited with code 4294967295 (2^32-1).

Signed-off-by: Erik Sipsma <[email protected]>

Author: sipsma

executor/runcexecutor/executor.go

@@ -309,7 +309,7 @@ func exitError(ctx context.Context, err error) error {
 			Err:      err,
 		}
 		var runcExitError *runc.ExitError
-		if errors.As(err, &runcExitError) {
+		if errors.As(err, &runcExitError) && runcExitError.Status >= 0 {
 			exitErr = &gatewayapi.ExitError{
 				ExitCode: uint32(runcExitError.Status),
 			}