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diff --git a/Documentation/namespaces/compatibility-list.rst b/Documentation/namespaces/compatibility-list.rst deleted file mode 100644 index 318800b2a943..000000000000 --- a/Documentation/namespaces/compatibility-list.rst +++ /dev/null @@ -1,43 +0,0 @@ -============================= -Namespaces compatibility list -============================= - -This document contains the information about the problems user -may have when creating tasks living in different namespaces. - -Here's the summary. This matrix shows the known problems, that -occur when tasks share some namespace (the columns) while living -in different other namespaces (the rows): - -==== === === === === ==== === -- UTS IPC VFS PID User Net -==== === === === === ==== === -UTS X -IPC X 1 -VFS X -PID 1 1 X -User 2 2 X -Net X -==== === === === === ==== === - -1. Both the IPC and the PID namespaces provide IDs to address - object inside the kernel. E.g. semaphore with IPCID or - process group with pid. - - In both cases, tasks shouldn't try exposing this ID to some - other task living in a different namespace via a shared filesystem - or IPC shmem/message. The fact is that this ID is only valid - within the namespace it was obtained in and may refer to some - other object in another namespace. - -2. Intentionally, two equal user IDs in different user namespaces - should not be equal from the VFS point of view. In other - words, user 10 in one user namespace shouldn't have the same - access permissions to files, belonging to user 10 in another - namespace. - - The same is true for the IPC namespaces being shared - two users - from different user namespaces should not access the same IPC objects - even having equal UIDs. - - But currently this is not so. |