WO2003107220B1 - Layered computing systems and methods for insecure environments - Google Patents

Layered computing systems and methods for insecure environments

Info

Publication number
WO2003107220B1
WO2003107220B1 PCT/US2003/018589 US0318589W WO03107220B1 WO 2003107220 B1 WO2003107220 B1 WO 2003107220B1 US 0318589 W US0318589 W US 0318589W WO 03107220 B1 WO03107220 B1 WO 03107220B1
Authority
WO
WIPO (PCT)
Prior art keywords
read
layer
write
request
file
Prior art date
Application number
PCT/US2003/018589
Other languages
French (fr)
Other versions
WO2003107220A1 (en
Inventor
R Blaser Jared
R Cook Randall
Original Assignee
Fslogic Inc
R Blaser Jared
R Cook Randall
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fslogic Inc, R Blaser Jared, R Cook Randall filed Critical Fslogic Inc
Priority to AU2003251505A priority Critical patent/AU2003251505A1/en
Publication of WO2003107220A1 publication Critical patent/WO2003107220A1/en
Publication of WO2003107220B1 publication Critical patent/WO2003107220B1/en

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F8/00—Arrangements for software engineering
    • G06F8/60—Software deployment
    • G06F8/61—Installation

Abstract

The inventions relate generally to computer systems having facilities for providing virtual portions of file systems and configuration settings to applications. More particularly, the inventions relate to computer systems that provide a layer organization for files and configuration settings that can be overlaid on top of an operating system, and can later delete the layer organization to restore the computer systems to a clean state. An exemplary system includes a base operating system (110), operating system file system and registry libraries (108), layering system libraries and/or software (106), applications (104), a management applications programmer interface (102), and a layer manager application (100). Detailed information on various example embodiments of the inventions are provided in the Detailed Description below, and the inventions are defined by the appended claims.

Claims

AMENDED CLAIMS received by the International Bureau on 08 January 2004 (08.01.2004) original claims 1, 10 and 17 amended (6 pages)]
1. A set of computer readable media containing computer instructions for operating a layered computing environment in an insecure or public environment, the set of computer readable media comprising at least one medium upon which is stored the computer instructions executable by a computing system to achieve the functions of:
(i) receiving from applications read requests for read operations to a file system, the read requests each containing a file reference,
(ii) for file references of particular received read requests, attempting to identify an owner layer from a set of currently enabled layers,
(iii) if, for a particular read request, an owner layer is identified for the file reference of that read request, identifying a virtual read reference utilizing information contained in the identified owner layer, the virtual read reference referencing a corresponding file structure to the file reference of the particular read request,
(iv) following an identification of a virtual read reference, causing a read operation to execute using that virtual read reference,
(v) if, for a particular read request, an owner layer is not identified for the file reference of that read request, causing a read operation to execute using the file reference of the particular read request,
(vi) receiving from applications write requests for write operations to a file system, the write requests each containing a file reference,
(vii) for file references of particular received write requests, attempting to identify an owner layer from a set of currently enabled layers,
(viii) if, for a particular write request, an owner layer is identified for the file reference of that write request, identifying a virtual write reference utilizing information contained in the identified owner layer, the virtual write reference corresponding to the file reference of the particular write request,
(ix) following the identifying a virtual write reference, causing a write operation to execute using that virtual write reference,
(x) if, for a particular write reference, an owner layer is not identified for the file reference of that write request, causing a write operation to execute using the file reference of the particular write request,
(xi) receiving management commands through an applications programmer interface;
(xii) receiving a management command through an applications programmer interface to delete a specified layer; and
(xiii) delete the specified layer.
2. A set of computer readable media according to claim 1 , wherein the computer instructions are further executable to achieve the functions of:
(xiv) receiving from applications requests to create, delete, and set the value of a registry setting;
(xv) following receipt of a request to create, delete or set the value of a registry setting, identifying an enabled read-writable layer to capture to;
(xvi) acting on a request to create a registry setting, causing the registry setting to be created virtually in the identified layer;
(xvii) acting on a request to delete a registry setting, causing the registry setting to be deleted virtually in the identified layer;
(xviii) acting on a request to set a registry setting, causing the registry setting to be created virtually in the identified layer.
3. A set of computer readable media according to claim 1 , wherein the computer instructions are further executable to:
(xiv) determine whether or not a layer has a peer layer; and
(xv) identify a peer layer for a layer where a peer layer has been determined to exist.
4. A set of computer readable media according to claim 1 , wherein the computer instructions are further executable to perform a write operation to the read-writable peer of a peer group.
5. A set of computer readable media according to claim 1 , wherein the computer instructions are further executable to impede modification of the underlying base operating system.
6. A set of computer readable media according to claim 4, wherein the computer instructions are further executable to cause all write operations to be captured to at least one read-writable layer.
7. A set of computer readable media according to claim 1 , wherein the computer instructions are further executable to achieve the functions of:
(xiv) examining the installed layers for a configuration element, that element specifying for each layer whether or not the layer is to be enabled on system initialization; and
(xv) enabling those layers having configuration elements specifying layer enablement on system initialization.
8. A set of computer readable media according to claim 1 , wherein the computer instructions are further executable to read layers over a network interface.
9. A set of computer readable media according to claim 1 , wherein the computer instructions are further executable to write user layers over a network interface to a common user layer area.
10. A computing system supporting a layered computing environment for operation in an insecure or public environment, comprising: a processor; a storage device group accessible by said processor, said storage device group containing at least one storage device operable to contain operating system files, applications and layers; one or more layers stored to said storage device group; instructions stored to said storage device group, said instructions being further executable by said processor to achieve the functions of:
(i) receiving from applications read requests for read operations to a file system, the read requests each containing a file reference,
(ii) for file references of particular received read requests, attempting to identify an owner layer from a set of currently enabled layers,
(iii) if, for a particular read request, an owner layer is identified for the file reference of that read request, identifying a virtual read reference utilizing information contained in the identified owner layer, the virtual read reference referencing a corresponding file structure to the file reference of the particular read request,
(iv) following an identification of a virtual read reference, causing a read operation to execute using that virtual read reference,
(v) if, for a particular read request, an owner layer is not identified for the file reference of that read request, causing a read operation to execute using the file reference of the particular read request,
(vi) receiving from applications write requests for write operations to a file system, the write requests each containing a file reference,
(vii) for file references of particular received write requests, attempting to identify an owner layer from a set of currently enabled layers,
(viii) if, for a particular write request, an owner layer is identified for the file reference of that write request, identifying a virtual write reference utilizing information contained in the identified owner layer, the virtual write reference corresponding to the file reference of the particular write request,
(ix) following the identifying a virtual write reference, causing a write operation to execute using that virtual write reference,
(x) if, for a particular write reference, an owner layer is not identified for the file reference of that write request, causing a write operation to execute using the file reference of the particular write request,
(xi) receiving management commands through an applications programmer interface,
(xii) through an applications programmer interface, receiving a management command to delete a specified layer, and
(xiii) delete the specified layer.
11. A computing system according to claim 10, wherein the computer instructions are further executable to achieve the functions of:
(xiv) receiving from applications requests to create, delete, and set the value of a registry setting;
(xv) following receipt of a request to create, delete or set the value of a registry setting, identifying an enabled read-writable layer to capture to;
(xvi) acting on a request to create a registry setting, causing the registry setting to be created virtually in the identified layer;
(xvii) acting on a request to delete a registry setting, causing the registry setting to be deleted virtually in the identified layer;
(xviii) acting on a request to set a registry setting, causing the registry setting to be created virtually in the identified layer.
12. A computing system according to claim 10, wherein the computer instructions are further executable to impede modification of the underlying base operating system.
13. A computing system according to claim 10, wherein the computer instructions are further executable to cause all write operations to be captured to at least one read-writable layer.
14. A computing system according to claim 10, wherein the computer instructions are further executable to achieve the functions of:
(xiv) examining the installed layers for a configuration element, that element specifying for each layer whether or not the layer is to be enabled on system initialization; and
(xv) enabling those layers having configuration elements specifying layer enablement on system initialization.
15. A computing system according to claim 1 , wherein the computer instructions are further executable to read layers over a network interface.
16. A computing system according to claim 1, wherein the computer instructions are further executable to write user layers over a network interface to a common user layer area.
17. A method of operating a layered computing system in an insecure or public environment, the method comprising the steps of:
(i) receiving from applications read requests for read operations to a file system, the read requests each containing a file reference,
(ii) for file references of particular received read requests, attempting to identify an owner layer from a set of currently enabled layers,
(iii) if, for a particular read request, an owner layer is identified for the file reference of that read request, identifying a virtual read reference utilizing information contained in the identified owner layer, the virtual read reference referencing a corresponding file structure to the file reference of the particular read request,
(iv) following an identification of a virtual read reference, causing a read operation to execute using that virtual read reference,
(v) if, for a particular read request, an owner layer is not identified for the file reference of that read request, causing a read operation to execute using the file reference of the particular read request,
(vi) receiving from applications write requests for write operations to a file system, the write requests each containing a file reference,
(vii) for file references of particular received write requests, attempting to identify an owner layer from a set of currently enabled layers,
(viii) if, for a particular write request, an owner layer is identified for the file reference of that write request, identifying a virtual write reference utilizing information contained in the identified owner layer, the virtual write reference corresponding to the file reference of the particular write request,
(ix) following the identifying a virtual write reference, causing a write operation to execute using that virtual write reference,
(x) if, for a particular write reference, an owner layer is not identified for the file reference of that write request, causing a write operation to execute using the file reference of the particular write request,
(xi) receiving management commands through an applications programmer interface;
(xii) through an applications programmer interface, receiving management commands to delete specified layers; and
(xiii) delete layers specified through received management commands to delete layers.
18. A method according to claim 17 further comprising the steps of:
(xiv) receiving from applications requests to create, delete, and set the value of registry settings;
(xv) following receipt of a request to create, delete or set the value of a registry setting, identifying an enabled read-writable layer to capture to;
(xvi) acting on requests to create a registry setting, causing the registry settings to be created virtually in the identified layers;
(xvii) acting on requests to delete a registry setting, causing the registry settings to be deleted virtually in the identified layers;
(xviii) acting on requests to set a registry setting, causing the registry settings to be created virtually in the identified layers.
19. A method according to claim 17, further comprising the step of providing an impediment to modification of the underlying base operating system.
20. A method according to claim 17, further comprising the step of capturing all write operations to at least one read-writable layer.
PCT/US2003/018589 2002-06-12 2003-06-11 Layered computing systems and methods for insecure environments WO2003107220A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003251505A AU2003251505A1 (en) 2002-06-12 2003-06-11 Layered computing systems and methods for insecure environments

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US38796902P 2002-06-12 2002-06-12
US60/387,969 2002-06-12

Publications (2)

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WO2003107220B1 true WO2003107220B1 (en) 2004-05-27

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PCT/US2003/018588 WO2003107183A1 (en) 2002-06-12 2003-06-11 Systems and methods for the creation of software packages using layered systems
PCT/US2003/018633 WO2003107221A1 (en) 2002-06-12 2003-06-11 Layered computing systems and methods

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US (2) US7117495B2 (en)
AU (3) AU2003251505A1 (en)
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US7162724B2 (en) 2007-01-09
AU2003251505A1 (en) 2003-12-31
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US20030233647A1 (en) 2003-12-18
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US20030233490A1 (en) 2003-12-18
US7117495B2 (en) 2006-10-03

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