| Re: [RFC PATCH 0/2] net: connect to UNIX sockets from specified root [message #47444 is a reply to message #47438] |
Fri, 10 August 2012 18:50  |
Stanislav Kinsbursky
Messages: 683
Registered: October 2011
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Senior Member |
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10.08.2012 22:15, H. Peter Anvin пишет:
> On 08/10/2012 05:57 AM, Stanislav Kinsbursky wrote:
>> 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.
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