Allocation of Resources in a Computing Device

• US 20070294698A1
• Filed: 11/19/2004
• Published: 12/20/2007
• Est. Priority Date: 11/21/2003
• Status: Abandoned Application

• Current Assignee: Nokia Technologies Oy (Nokia Corporation)
• Original Assignee: Symbian Software Limited (Accenture PLC)
• Inventors: Thoelke, Andrew, May, Dennis
• Application Number:
  US10/595,927
• Publication Number:
  US 20070294698A1
• Time in Patent Office: Days
• US Class Current: 718/104
• CPC Class Codes: G06F 21/6209 to a single file or object, e.g. in a secure envelope, encrypted and accessed using a key, or with access control rules appended to the object itself
• CPC Class Codes: G06F 9/468 Specific access rights for resources, e.g. using capability register
• CPC Class Codes: G06F 9/52 Program synchronisation; Mutual exclusion, e.g. by means of semaphores

Abstract

In operation of a computing device, a secure handle is allocated to a process to enable the process to use a resource allocated to another process. The secure handle ensures that the process is not able to identify the resource and that further access to the resource is inhibited after the process has terminated any use of the resource enabled by the allocation of the secure handle.

Claims

1. A method of operating a computing device, the method comprising allocating a handle to a process for enabling the process to use a resource allocated to another process, arranging the handle such that the process is not able to identify the resource, and inhibiting further access by the process to the resource after the use of the resource by the process arising from the allocation of the handle has been terminated.

2. A method according to claim 1 wherein the handle is arranged to enable a plurality of resources allocated to the said another process to be used by the process.

3. A method according to claim 1 wherein the handle is arranged to enable a plurality of processes other than the said another process to use the resource allocated to the said another process.

4. A method according to claim 2 wherein the handle is arranged to enable a plurality of processes other than the said another process to use the resource allocated to the said another process.

5. A method according to claim 1 wherein, the resource is selected to comprise at least one of computing device memory, a semaphore, a mutex a chunk, a message queue, a thread, a file, or a device channel.

6. A method according to claim 5 wherein, when the resource comprises a file, the file comprises at least one of a trusted font file or a message attachment file for the said another process.

7. A method according to claim 5 wherein the resource is located in a data cage within the said another process.

8. A method according to claim 1 wherein the process is selected to comprise a file server.

9. A method according to claim 8 wherein the file server is arranged to indicate to a kernel of the operating system for the computing device that it is able to support the use of the resource prior to the allocation of the handle to the server.

10. A method according to claim 8 wherein the said other process is arranged to terminate a communication session with the server upon allocation of the file handle to the server.

11. A method according to claim 1 wherein the said another process comprises a patent process, the process comprises a child process, and the resource comprises a kernel resource for an operating system for the computing device.

12. A method according to claim 1 wherein the handle is provided as an anonymous instantiation of a server required to access the resource.

13. A computing device arranged to operate in accordance with a method as claimed in claim 12.

14. A computing device according to claim 13 comprising a wireless communication device.

15. Computer software for causing a computing device to operate in accordance with a method as claimed in claim 1.