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

MITRE https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=275308 [No types assigned]

MITRE https://github.com/openzfs/zfs/issues/15526 [No types assigned]

MITRE https://github.com/openzfs/zfs/pull/15571 [No types assigned]

MITRE https://news.ycombinator.com/item?id=38405731 [No types assigned]

MITRE https://web.archive.org/web/20231124172959/https://www.ibm.com/support/pages/how-remove-missing%C2%A0newline%C2%A0or%C2%A0line%C2%A0too%C2%A0long-error-etchostsallow%C2%A0and%C2%A0etchostsdeny-files [No types assigned]