Signed-off-by: Kir Kolyshkin <kolyshkin@xxxxxxxxx> --- man7/capabilities.7 | 6 ++++++ man7/user_namespaces.7 | 6 ++++++ 2 files changed, 12 insertions(+) diff --git a/man7/capabilities.7 b/man7/capabilities.7 index 9f8f0087f..2f9c9a61e 100644 --- a/man7/capabilities.7 +++ b/man7/capabilities.7 @@ -349,6 +349,12 @@ write a group ID mapping in a user namespace (see .TP .BR CAP_SETFCAP " (since Linux 2.6.24)" Set arbitrary capabilities on a file. +.IP +.\" commit db2e718a47984b9d71ed890eb2ea36ecf150de18 +Since Linux 5.12, this capability is +also needed to map uid 0 (as in +.BR unshare\ -Ur , +.RB see unshare (1). .TP .B CAP_SETPCAP If file capabilities are supported (i.e., since Linux 2.6.24): diff --git a/man7/user_namespaces.7 b/man7/user_namespaces.7 index 518e7a3bb..3378b6057 100644 --- a/man7/user_namespaces.7 +++ b/man7/user_namespaces.7 @@ -577,6 +577,12 @@ or be in the parent user namespace of the process The mapped user IDs (group IDs) must in turn have a mapping in the parent user namespace. .IP 4. +.\" commit db2e718a47984b9d71ed890eb2ea36ecf150de18 +If a writing process is root (i.e. UID 0) trying to map host user ID 0, +it must have +.B CAP_SETFCAP +capability (since Linux 5.12). +.IP 5. One of the following two cases applies: .RS .IP * 3 -- 2.31.1
