libnvpair3linux: OpenZFS through 2.1.13 and 2.2.x through 2.2.1, in certain scenariosinvolving applications that try to rely on effici...

OpenZFS through 2.1.13 and 2.2.x through 2.2.1, in certain scenariosinvolving applications that try to rely on efficient copying of file data,can replace file contents with zero-valued bytes and thus potentiallydisable security mechanisms. NOTE: this issue is not always securityrelated, but can be security related in realistic situations. A possibleexample is cp, from a recent GNU Core Utilities (coreutils) version, whenattempting to preserve a rule set for denying unauthorized access. (Onemight use cp when configuring access control, such as with the/etc/hosts.deny file specified in the IBM Support reference.) NOTE: thisissue occurs less often in version 2.2.1, and in versions before 2.1.4,because of the default configuration in those versions.

Where it's fixed