Re: [RFC PATCH 0/2] net: connect to UNIX sockets from specified root

10.08.2012 22:15, H. Peter Anvin пишет:

On 08/10/2012 05:57 AM, Stanislav Kinsbursky wrote:

quoted

Today, there is a problem in connecting of local SUNRPC thansports. These
transports uses UNIX sockets and connection itself is done by rpciod
workqueue.
But UNIX sockets lookup is done in context of process file system root. I.e.
all local thunsports are connecting in rpciod context.
This works nice until we will try to mount NFS from process with other root -
for example in container. This container can have it's own (nested) root and
rcpbind process, listening on it's own unix sockets. But NFS mount attempt in
this container will register new service (Lockd for example) in global rpcbind
- not containers's one.

This patch set introduces kernel connect helper for UNIX stream sockets and
modifies unix_find_other() to be able to search from specified root.
It also replaces generic socket connect call for local transports by new
helper in SUNRPC layer.

The following series implements...

On that whole subject...

Do we need a Unix domain socket equivalent to openat()?

It looks like sys_connectat () and sys_bindat () could be an organic 
part on openat () and friends family.
But currently I don't have any usage example for them in hands.  And the 
main problem here, that this syscalls can be used only for unix sockets.