(19) United States
`(12) Patent Application Publication (10) Pub. No.: US 2002/0066022 A1
`Calder et al.
`(43) Pub. Date:
`May 30, 2002
`
`US 20020066022A1
`
`(54) SYSTEM AND METHOD FOR SECURING AN
`APPLICATION FOR EXECUTION ON A
`COMPUTER
`
`(76) Inventors: Brad Calder, San Diego, CA (US);
`Andrew A. Chien, La Jolla, CA (US)
`
`Correspondence Address:
`KNOBBE MARTENS OLSON & BEAR LLP
`620 NEWPORT CENTER DRIVE
`SIXTEENTH FLOOR
`NEWPORT BEACH, CA 92660 (US)
`
`(21) Appl. No.:
`
`09/727,305
`
`(22) Filed:
`
`Nov. 29, 2000
`
`Publication Classi?cation
`
`(51) Int. Cl.7 ................................................... .. G06F 12/14
`
`(52) us. Cl. ............................................................ .. 713/200
`
`(57)
`
`ABSTRACT
`
`A system for securing an application for execution in a
`computer. In one embodiment, a preprocessor module modi
`?es an application binary such that the application invokes
`an interception module in response to invoking certain
`system calls. The interception module prevents the applica
`tion from adversely affecting the operating of a computer
`that is executing the application. Furthermore, the intercep
`tion module protects the contents of the application from
`improper access by a user of the computer. For example, the
`interception module transparently encrypts all ?les that are
`used by the application such that a user of the computer
`cannot improperly access these ?les.
`
`I
`
`BEGIN
`
`I
`
`V
`
`COMPILE SOURCE
`CODE INTO OBJECT CODE
`
`V
`
`510
`
`520
`
`PREPROCESS APPLICATION PACKAGE FOR
`EXECUTION IN THE SECURE CLIENT
`ENVIRONMENT
`
`V
`
`530
`
`APPLICATION MANAGER ON CLIENT RETRIEVES
`MODIFIED OBJECT CODE FROM SERVER
`
`\
`
`540
`
`INITIALIZE APPLICATION PACKAGE
`AND PATCH LIBRARIES
`
`ii VIRTUALIZE INTERCEF’TED CALLS
`
`V
`
`DURING EXECUTION
`
`V
`
`550
`
`560
`
`TRANSMIT RESULTS TO SERVER
`
`V
`
`I
`
`RETURN
`
`Symantec 1003
`IPR of U.S. Pat. No. 8,141,154
`
`000001
`
`

`
`Patent Application Publication May 30, 2002 Sheet 1 0f 51
`
`US 2002/0066022 A1
`
`110
`
`120
`
`PREPROCESSING
`MODULE
`
`/ 11s
`' APPLICATION PACKAGE —>
`
`SERVER
`
`130
`
`140
`
`150
`
`'
`
`160
`
`CLlENT
`
`CLIENT
`
`CLIENT
`
`FIG.1
`
`000002
`
`

`
`Patent Application Publication May 30, 2002 Sheet 2 0f 51
`
`US 2002/0066022 A1
`
`210
`
`215
`
`APPLICATION BINARY ————>
`
`————+ MODIFIED BINARIES
`
`110
`
`220
`
`225
`
`LIBRARIES —>
`230
`CONFIGURATION FILES ___>
`
`PREPROCESSOR
`MODULE
`
`——> MODIFIED LIBRARIES
`4 235
`—_} MCLDIIEDéFIED CO FIGURATION
`
`240
`
`245
`
`DATA FILEs —>
`
`~——> MODIFIED DATA FILES
`
`‘I RRRRRRRRRRRRRRRRRRRRRRR if? 250
`\ EXECUTION ENvIRONMEN 1
`INFORMATION
`DIRECTORY STRUCTURES
`1
`SECURITY INFORMATION
`2 I 60
`NEW ——>' SYSTEM INFORMATION/
`
`‘
`I
`I
`I
`
`FIG. 2
`
`000003
`
`

`
`Patent Application Publication May 30, 2002 Sheet 3 0f 51
`
`US 2002/0066022 A1
`
`NORMAL EXECUTION
`
`APPLICATION
`
`310
`
`320
`
`SYSTEM
`INTERFACE
`
`340
`
`350
`
`SYSTEM
`DLL's
`
`33°
`
`360
`
`370
`
`380
`
`390
`
`RESOURCE
`ALLOCATION
`AND
`DEALLOCATION
`
`REG'STRY
`
`FILE
`SYSTEM
`
`OTHER
`ENVIRONMENT
`
`NETWORK
`
`GRAPHICS
`INTERFACES
`
`OPERATING SYSTEM
`
`FIG. 3
`
`000004
`
`

`
`Patent Application Publication May 30, 2002 Sheet 4 0f 51
`
`US 2002/0066022 A1
`
`SECURE EXECUTION
`
`405
`
`410
`
`PREPROCESSED
`APPLICATION
`
`k
`
`APPLICATION
`MANAGER
`
`415
`
`VIRTUALIZED SYSTEM INTERFACE
`(RESOURCES. FILES. DATA, NAMES
`
`425
`
`RESOURCE
`ALLOCATION
`AND
`DEALLOCAHON
`
`INTERCEPTED
`SYSTEM CALLS
`430
`
`42°
`
`435
`
`440
`
`445
`
`450
`
`VIRTUALIZED
`REGISTRY
`
`VIRTUALIZED
`FILE SYSTEM
`
`V'RCT)¥QE'€ED
`ENVI
`MENT
`RON
`
`VIRTUALIZED
`NETWORK
`
`vggzl??llégo
`C
`INTERFA Es
`
`320
`
`[/ SYSTEM
`
`INTERFACE
`
`SYSTEM
`DLL's
`
`340
`
`350
`
`33°
`
`360
`
`370
`
`380
`
`390
`
`RESOURCE
`ALLOCATION
`AND
`EJEALLOCATION
`
`REG'STRY
`
`FILE
`SYSTEM
`
`OTHER
`ENVIRONMENT
`
`NETWORK
`
`GRAPHICS
`INTERFACES
`
`FIG. 4
`
`000005
`
`

`
`Patent Application Publication May 30, 2002 Sheet 5 0f 51
`
`US 2002/0066022 A1
`
`I
`
`BEGIN
`
`I
`
`V
`
`COMPILE
`SOURCE
`CODE INTO 0
`BJECT CODE
`
`V
`
`510
`
`520
`
`PREPROCESS APPLICATION PACKAGE FOR
`EXECUTION IN THE SECURE CLIENT
`ENVIRO NMENT
`
`530
`
`APPLICATION MANAGER ON CLIENT RETRIEVES
`MODIFIED OBJECT C ODE FROM SERVER
`
`540
`
`INITIALIZE APPLICATION PACKAGE
`AND PATCH LIBRARIES
`
`ii VIRTUALIZE INTE RC EPTED CALLS
`
`V
`
`DURING EXECUTION
`
`550
`
`560
`
`TRANSMIT RESU LTS TO SERVER
`
`V
`I RETURN I
`
`FIG. 5
`
`000006
`
`

`
`Patent Application Publication May 30, 2002 Sheet 6 0f 51
`
`US 2002/0066022 A1
`
`520
`
`I
`
`BEGIN
`
`I
`
`9”)
`
`REWRITE BINARIES
`
`6?
`
`v
`MODIFY AND ADD ADDITIONAL
`EXECUTION
`ENVIRONMENT INFORMATION
`OF PACKAGE
`
`V
`
`ENCRYPT FILES
`OF APPLICATION PACKAGE
`
`620
`
`630
`
`640
`
`ENCRYPT FILENAMES
`
`V
`
`650
`
`ENCRYPT FILENAMES IN IMPORT
`TABLE
`
`v
`
`660
`/
`
`ENCRYPT AND SIGN APPLICATION
`PACKAGE
`
`\
`
`I
`
`RETURN I
`
`FIG. 6
`
`000007
`
`

`
`Patent Application Publication May 30, 2002 Sheet 7 0f 51
`
`US 2002/0066022 A1
`
`610
`
`I
`
`BEGIN
`
`I
`
`V
`
`/ 710
`
`SCAN FOR IMPROPER
`INSTRUCTIONS OR SEQUENCES
`
`730
`
`REWRITE APPLICATION
`BINARY TO
`INTERCEPT IMPROPER
`SEQUENCES
`
`720
`
`IMPROPER
`INSTRUCTIONS
`AND SEQUENCES
`IDENTIFIED?
`
`REWRITE IMPORT TABLE OF
`BINARIES TO ADD INTERCEPTION
`MODULE
`
`V
`
`STORE MODIFIED
`APPLICATION BINARY
`
`v
`RETURN I
`
`|
`
`FIG. 7
`
`000008
`
`

`
`Patent Application Publication May 30, 2002 Sheet 8 0f 51
`
`US 2002/0066022 A1
`
`620
`
`I
`
`BEGIN
`
`I
`
`T
`
`810
`
`ADD INTERCEPTION
`MODULE TO APPLICATION
`PACKAGE
`
`V
`
`820
`
`ADD SECURITY
`INFORMATION TO
`APPLICATION PACKAGE
`
`830
`
`PROVIDE VIRTUAL
`ENVIRONMENTAL SETTINGS
`FOR SYSTEM DATABASE
`
`840
`
`V
`PROVIDE VIRTUAL SYSTEM
`MODULES TO ALLOW
`APPLICATION PACKAGE TO
`EXECUTE ON NON-NATIVE
`PLATFORMS
`
`f
`
`850
`
`REMOVE SELECTED FILES
`FROM APPLICATION
`PACKAGE
`
`860
`
`OBFUSCATE DIRECTORY
`STRUCTURE
`
`END
`
`FIG, 8
`
`000009
`
`

`
`Patent Application Publication May 30, 2002 Sheet 9 0f 51
`
`US 2002/0066022 A1
`
`540
`
`I
`
`BEGIN
`
`I
`
`V
`APPLICATION MANAGER REQUESTS
`OPERATING SYSTEM TO EXECUTE
`APPLICATION PACKAGE
`
`V
`
`910
`
`920
`
`OPERATING SYSTEM LOADS ALL LIBRARIES
`IDENTIFIED BY IMPORT TABLES INTO MEMORY
`
`V
`OPERATING SYSTEM EXECUTES
`INITIALIZATION ROUTINE OF DEFAULT
`SYSTEM LIBRARIES
`
`930
`
`T
`OPERATING SYSTEM EXAMINES IMPORT
`TABLE AND EXECUTES INITIALIZATION
`ROUTINE OF THE INTERCEPT MODULE FIRST
`
`940
`
`T
`
`950
`
`PATCH LOADED LIBRARIES
`
`V
`MAKE ALL CODE PAGES EXECUTE ONLY AND
`REMOVE ALL EXECUTION PRIVILEGES FROM
`REMAINING PAGES
`
`960
`
`V
`
`INITIALIZE VIRTUAL SYSTEM DATABASE
`
`B? START VIRTUAL MACHINE COMMUNICATION
`
`970
`
`980
`
`990
`
`V
`
`THREAD
`
`V
`OPERATING SYSTEM EXECUTES
`INITIALIZATION ROUTINES OF OTHER
`LIBRARIES IN THE IMPORT TABLE
`
`END
`
`FIG. 9
`
`000010
`
`

`
`Patent Application Publication May 30, 2002 Sheet 10 0f 51
`
`US 2002/0066022 A1
`
`950
`
`I
`
`BEGIN
`
`I
`
`1010
`/
`V
`CREATE AN AVAILABLE LIST OF
`ROUTINES BASED UPON ALL
`SYSTEM ROUTINES LISTED BY
`THE EXPORT TABLE OF THE
`LIBRARY BEING PROCESSED
`
`CREATE A SHUTDOWN LIST BY
`DELETING FROM AVAILABLE LIST
`ALL SYSTEM ROUTINES
`MAINTAINED BY INTERCEPT
`MODULE
`
`V
`
`INTERCEPT ROUTINES IN
`SHUTDOWN LIST SO THAT THEY
`INVOKE AN ERROR HANDLING
`ROUTINE
`
`V
`
`1040
`/
`
`®-\ INTERCEPT ALL ROUTINES
`IDENTIFIED BY VIRTUAL LIST
`
`ROUTINES IN MEDIATED LIST ARE
`NOT MODIFIED
`
`V
`RETURN I
`
`I
`
`FIG. 10
`
`000011
`
`

`
`Patent Application Publication May 30, 2002 Sheet 11 0f 51
`
`US 2002/0066022 A1
`
`1040
`
`I
`
`BEGIN
`
`I
`
`V
`
`1110
`
`RETRIEVE START ADDRESS OF
`ROUTINE TO BE INTERCEPTED
`
`V
`
`1120
`
`RETRIEVE START ADDRESS OF
`THE WRAPPER ROUTINE
`
`V
`
`1130
`
`CREATE A DYNAMIC VERSION OF
`THE INTERCEPTED ROUTINE
`
`V
`
`1140
`
`SET PAGE ATTRIBUTES OF
`DYNAMICALLY CREATED CODE TO
`EXECUTE ONLY
`
`v
`
`1150
`
`REPLACE ORIGINAL ROUTINE
`WITH NO-OPS ENDING WITH
`ERROR CODE
`
`1160
`
`V
`CHANGE ENTRY POINT OF
`INTERCEPTED ROUTINE TO
`DIRECTLY POINT TO WRAPPER
`ROUTINE
`
`V
`
`1170
`
`MODIFY VARIABLE USED BY
`WRAPPER ROUTINE TO POINT TO
`DYNAMICALLY CREATED ROUTINE
`
`V
`RETURN I
`
`I
`
`FIG. 11
`
`000012
`
`

`
`Patent Application Publication May 30, 2002 Sheet 12 0f 51
`
`US 2002/0066022 A1
`
`970
`
`I
`
`BEGIN
`
`I
`
`1210
`
`OPEN VIRTUAL DATABASE
`
`1220
`
`SHOULD
`APPLICATION
`CREATE NEW
`DATABASE?
`
`DOES VIRTUAL
`DATABASE EXIST?
`
`1 230
`
`No
`
`V
`RETURN
`
`I
`
`FIG‘ 12
`
`1240
`
`CREATE VIRTUAL
`DATABASE
`
`i
`
`1250
`
`COPY PREDEFINED
`LIST NON-CHANGED
`KEYS FROM SYSTEM
`DATABASE TO
`VIRTUAL DATABASE
`
`i / 1260
`READ PREDEFINED
`LIST OF MASKED
`KEYS FROM REAL
`SYSTEM DATABASE
`l
`1270
`COMPLETELY OR PARTIALLY
`CHANGE DATA USING PREDEFINED
`DATA FOR DATABASE TABLE
`MAINTAINED BY INTERCEF'T
`MODULES
`i / 1280
`
`WRITE THE NEW
`CHANGED DATA TO
`VIRTUAL DATABASE
`
`000013
`
`

`
`Patent Application Publication May 30, 2002 Sheet 13 0f 51
`
`US 2002/0066022 A1
`
`i
`
`1320
`
`1310
`
`1335
`
`‘V
`
`1355
`
`‘Y
`
`LIBRARY
`REQUEST
`
`NETWORK
`REQUEST
`
`RESOURCE
`REQUEST
`
`DATABASE
`
`‘
`
`1315
`
`‘V
`
`1330
`
`‘V
`
`1345
`
`FILE
`SYSTEM
`
`GRAPHICS
`
`SHUTDOWN
`
`1340
`
`MACHINE
`SPEClFlC
`lNFORMATlON
`
`‘
`
`1350
`
`"
`
`END
`
`RAlSE AN ERROR
`IDENTIFYING
`WHICH ROUTINE
`IS CALLED
`
`‘
`END
`
`1305
`
`EXCEPTION
`
`‘V
`
`1360
`
`PROCESS
`CREATE AND
`TERMINATE
`
`1365
`
`v
`
`THREAD QUERY
`
`‘
`
`1325
`
`MODIFY PAGE
`PERMISSIONS
`
`HS. 13
`
`000014
`
`

`
`Patent Application Publication May 30, 2002 Sheet 14 0f 51
`
`US 2002/0066022 A1
`
`1405
`
`IDENTIFY TYPE OF
`FILE SYSTEM
`REQUEST
`l
`
`1415
`
`1410
`
`1420
`
`‘V
`
`OPEN
`
`READ OR
`WRITE
`
`MAP FILE TO
`MEMORY
`
`1430
`
`v
`TZ’QTLEEIIIEN
`
`ROUTINES
`
`I
`
`G)
`
`UNMAP FILE
`FROM
`MEMORY
`
`i ‘J
`
`1425
`
`‘
`
`v
`
`i
`
`j
`
`1480
`
`PHLE
`TO BE OPENED IN
`A PRE-DEFINED
`
`LIST?
`
`Yes
`
`DO NOT
`’ MODIFY CALL
`
`L
`
`IS FILE TO BE
`OPENED IN
`SANDBOX
`DIRECTORY‘?
`
`1482
`
`Yes
`
`’
`
`ENCRYPT
`FILENAME
`
`1450
`
`CREATE VIRTUAL AND
`ENCRYPTED FILENAME TO
`REDIRECT IT TO SANDBOX
`
`Yes
`
`1455
`
`DOES
`DIRECTORY
`IN FILENAME EXIST
`
`CREATE
`DIRECTORIES IN
`VIRTUAL TREE
`I—___
`
`FIG. 14
`
`1484
`
`‘486
`
`DOES FILE
`EXIST AND DOES
`IT CONTAIN
`EXECUTABLE
`CODE?
`
`Yes_>
`
`REMOVE
`WR|TE
`PRIVILEGES
`FROM OPEN
`COMMAND
`
`1490
`
`CALL ORIGINAL
`OPEN AND RETURN
`HANDLE
`
`000015
`
`

`
`Patent Application Publication May 30, 2002 Sheet 15 0f 51
`
`US 2002/0066022 A1
`
`IS EXCEPTION AN
`ACCESS VIOLATION AND
`FALLING WITHIN ONE OF
`MEMORY MAPPED
`VIRTUAL BUFFERS'?
`
`1550
`
`No———)
`
`PASS ON EXCEPTION
`
`Yes
`
`1520
`
`IDENTIFY BLOCK
`CORRESPONDING TO
`ADDRESS CAUSING
`EXCEPTION
`
`V
`
`1560
`
`IF EXCEPTION IS NOT
`HANDLED BY THE
`APPLICATION, THEN NOTIFY
`A VIRTUAL MACHINE THREAD
`
`v
`
`1530
`
`DECRYPT BLOCK FROM
`REAL BUFFER COPYING IT
`TO THE VIRTUAL BUFFER
`
`V
`
`MODIFY VIRTUAL MEMORY
`BLOCK PROTECTION FLAG
`TO BE ACCESSIBLE
`
`\
`
`RETURN
`
`FIG. 15
`
`000016
`
`

`
`Patent Application Publication May 30, 2002 Sheet 16 0f 51
`
`US 2002/0066022 A1
`
`BEGIN
`
`1610
`
`ENCRYPT FILENAME _®
`
`I
`
`1620
`
`LOAD LIBRARY "NAME" INTO
`MEMORY IF NOT ALREADY
`LOADED
`
`HAS FILE BEEN
`MODIFIED?
`
`Yes—>
`
`CHECK FOR IMPROPER
`INSTRUCTION
`SEQUENCES
`
`1640
`
`1650
`
`RECURSIVELY LOAD ALL
`LIBRARIES THAT SELECTED
`LIBRARY DEPENDS UPON IN
`ITS IMPORT TABLE LIST INTO
`MEMORY IF NOT ALREADY
`LOADED
`
`I
`
`PATCH LOADED
`LIBRARIES
`
`1660
`
`é
`
`MAKE CODE PAGES
`EXECUTE ONLY AND
`REMOVE ALL EXECUTION
`PRIVILEGES FROM
`REMAINING NEW PAGES
`
`I
`
`I
`
`1 665
`
`1670
`
`EXECUTE DLL INITIALIZATION
`OF ALL LOADED LIBRARIES
`
`END
`
`FIG. 16
`
`000017
`
`

`
`Patent Application Publication May 30, 2002 Sheet 17 0f 51
`
`US 2002/0066022 A1
`
`I
`
`BEGIN
`
`I
`
`1710
`
`CHECK FILE FOR IMPROPER
`INSTRUCTION SEQUENCES
`
`1720
`
`INTERCEPT IMPROPER
`SEQUENCES THAT WERE FOUND
`
`1740
`
`WERE THERE
`ANY IMPROPER
`SEQUENCES OF
`INSTRUCTION NOT
`INTERCEPTED?
`
`‘73°
`
`VIRTUAL MEMORY SPACE
`ALLOCATED CONTAINING THOSE
`Yes—> IMPROPER SEQUENCES NOT
`INTERCEPTED WILL BE SET SUCH
`THAT IT CANNOT BE EXECUTED
`
`FIG. 17
`
`000018
`
`

`
`Patent Application Publication May 30, 2002 Sheet 18 0f 51
`
`US 2002/0066022 A1
`
`I
`
`BEGIN
`
`1805
`
`1815
`
`1825
`
`1835
`
`1845
`
`1855
`
`1865
`
`ACCEPT
`
`SEND TO
`
`RECEIVE
`FROM
`
`SHUT
`DOWN
`
`SOCKET
`
`CONNECT
`
`QUERY
`
`1810
`
`1820
`
`1830
`
`1840
`
`1850
`
`1860
`
`1870
`
`SEND
`
`RECEIVE
`
`CLOSE
`
`SELECT
`
`BIND
`
`LISTEN
`
`UPDATE
`
`5555 55
`
`FIG. 18
`
`000019
`
`

`
`Patent Application Publication May 30, 2002 Sheet 19 0f 51
`
`US 2002/0066022 A1
`
`ACCEPT
`
`1905
`
`IS
`INAgEéIEESS
`OVED
`LIST‘?
`
`RAISE VIRTUAL
`No_> MACHINE
`ERROR
`
`1945
`
`1910
`
`1950
`
`SOCKET
`IN TABLE?
`
`NO
`
`RETURN LOW
`LEVEL ERROR
`
`~
`'
`
`IS
`STATUS
`FLAG VALID FOR
`ACCEPT’?
`
`1920
`
`IS THERE
`AN ENTRY IN
`CONNECTION
`QUEUE?
`
`IS OPTION
`BLOCKING?
`
`CREATE NEW ENTRY IN
`SOCKET TABLE
`
`1925
`
`1970
`
`N“
`+
`RETURN EMPTY
`QUEUE STATUS
`
`I
`
`1930
`
`INITIALIZE SOCKET STRUCTURE
`(LOCAL) WITH INPUT PARAMETERS
`TO ACCEPT
`
`I
`
`1935
`
`REMOVE ENTRY FROM CONNECT
`QUEUE AND INITIALIZE OPTIONS
`AND REMOTE SOCKET STRUCTURE
`FROM ENTRY
`
`I
`
`1940
`
`ENQUEUE MESSAGE FOR PROXY
`SENDING BACK LOCAL SOCKET
`STRUCTURE TO REMOTE PROXY
`
`FIG. 19
`
`000020
`
`

`
`Patent Application Publication May 30, 2002 Sheet 20 of 51
`
`US 2002/0066022 A1
`
`BBB
`
`SEND
`
`2050
`
`RETURN LOW LEVEL
`ERROR
`
`SOCKET
`IN TABLE?
`
`YES
`
`
`
`
`
` STATUS
`
`VALID FOR
`SEND?
`
`
`
`
`
`RETURN LOW LEVEL
`ERROR
`
`WRITE BUFFER INTO SEND QUEUE
`
`NOTIFY PROXY
`
`
`
`RETURN
`
`FIG. 20
`
`000021
`
`000021
`
`

`
`Patent Application Publication May 30, 2002 Sheet 21 of 51
`
`US 2002/0066022 A1
`
`SEND TO
`
`2170 2110
`
`RETURN
`ERROR
`
`IS
`
`DESTINATION
`ADDRESS
`VALID?
`
`
`
`IS
`
`SOCKET ID
`IN TABLE?
`
`
`
`IS
`STATUS
`
`VALID FOR
`SEND?
`
`
`
`
`No
`
`
`
`Yes
`
`2140
`
`UPDATE REMOTE SOCKET STRUCTURE IN
`
`SOCKET TABLE
`
`WRITE BUFFER INTO SEND QUEUE
`
`NOTIFY
`
`PROXY
`
`
`RETURN
`
`FIG. 21
`
`000022
`
`000022
`
`

`
`Patent Application Publication May 30, 2002 Sheet 22 of 51
`
`US 2002/0066022 A1
`
`@
`
`RECEIVE
`
`BEGIN
`
`
`
`
`
`2220
`
`RETURN
`ERROR
`
`IS SOCKET
`
`IN TABLE?
`IS
`
`RECEIVE
`
`
`VALID GIVEN
`CURRENT
`
`STATUS?
` Yes
`
`2210
`
`RETU RN
`E RROR
`
`
`
`RETURN
`STATUS
`
`IS STATUS
`BLOCKING?
`
`IS
`THERE AN
`ENTRY IN RECEIVE
`QUEUE?
`
`
`
`Yes
`
`COPY INTO BUFFER UP TO
`AMOUNT SPECIFIED TO
`RECEIVE
`
`REMOVE CONSUMABLE
`ENTRIES FROM RECEIVE
`QUEUE
`
`RETURN NUMBER OF BYTES
`COPIED
`
`FIG. 22
`
`000023
`
`
`
`
`
`000023
`
`

`
`Patent Application Publication May 30, 2002 Sheet 23 of 51
`
`US 2002/0066022 A1
`
`RECEIVE
`FROM
`
`ERROR
`
`
`
`
`
`IS
`RECEIVE
`
`VALID GIVEN
`CURRENT
`
`STATUS?
`
`
`2320
`
`RETURN
`ERROR
`
`N°
`
`Yes
`
`/ 2310
`
`RETURN
`
`IS SOCKET
`IN TABLE?
`
`Yes
`
`IS
`THERE AN
`ENTRY IN RECENE
`QUEUE?
`
`IS STATUS
`BLOCKING?
`
`RETURN
`STATUS
`
`COPY INTO BUFFER UP TO
`AMOUNT SPECIFIED TO
`RECEIVE
`
`REMOVE CONSUMABLE
`ENTRIES FROM RECEIVE
`QUEUE
`
`LOOKUP THE REMOTE
`ADDRESS AND UPDATE THE
`ARGUMENTS
`
`RETURN NUMBER OF BYTE-S
`COPIED
`
`FIG. 23
`
`000024
`
`000024
`
`

`
`Patent Application Publication May 30, 2002 Sheet 24 of 51
`
`US 2002/0066022 A1
`
`CLOSE
`
`BEGIN
`
`
`
`RETURN LOW LEVEL
`
`N°
`ERROR
`
`
`
`RETURN LOW LEVEL
`ERROR
`
`IS STATUS
`VALID FOR
`TERMINATION?
`
`
`
`SET STATUS AS "TERMINATE" FOR
`TABLE ENTRY
`
`NOTIFY PROXY
`
`
`
`RETURN
`
`
`
`FIG. 24
`
`000025
`
`
` 2450
`
`
`
`IS
`SOCKET
`IN TABLE?
`
`
`2410
`
`000025
`
`

`
`Patent Application Publication May 30, 2002 Sheet 25 of 51
`
`US 2002/0066022 A1
`
`SHUTDOWN
`
`BEGIN
`
`
`
`[8 SOCKET
`IN TABLE?
`
`2520
`
`RETURN LOW
`LEVEL ERROR
`
`2530
`
`
`
`254°
`RETURN
`LOW
`LEVEL
`
`ERROR
`
`N
`
`°
`
`IS STATUS
`VALID FOR
`SHUTDOWN?
`
`«
`
`yes
`
`Yes
`
`2550
`
`CHANGE STATUS TO BE
`
`SHUTDOWN
`
`/ 2560
`
`NOTIFY PROXY
`
`RETU RN
`
`FIG. 25
`
`000026
`
`000026
`
`

`
`Patent Application Publication May 30, 2002 Sheet 26 of 51
`
`US 2002/0066022 A1
`
`SELECT
`
`
`
`BEGIN
`
`WAIT FOR SPECIFIED DELAY TIME
`TO EXPIRE
`
`/// 2610
`
`
`
`2620
`
`2630
`
`GIVEN LIST(S) OF SOCKETS, FIND
`ALL SOCKET MEETING A GIVEN
`CONDITION
`
`MODIFY SOCKET LIST BASED ON
`QUERY
`
`///2640
`
`RETURN NUMBER OF SOCKETS
`THAT MEET CONDITION
`
`FIG. 26
`
`000027
`
`000027
`
`

`
`Patent Application Publication May 30, 2002 Sheet 27 of 51
`
`US 2002/0066022 A1
`
`1845
`
`SOCKET
`
`BEGIN
`
`CREATE NEW ENTRY IN
`SOCKET TABLE AND
`INITIALTZE ENTRY
`
`2710
`
`2720
`
`
`
`
`RETURN UNIQUE
`SOCKET ID
`
`FIG. 27
`
`000028
`
`000028
`
`

`
`Patent Application Publication May 30, 2002 Sheet 28 of 51
`
`US 2002/0066022 A1
`
`BIND
`
`IS
`
`
`/ 2810
`NETWORK
`ADDRESS
`
`
`IN APPROVED
`LIST?
`
`
`2850
`
`No
`
`
`
`
`
`RAISE VIRTUAL
`MACHINE
`ERROR
`
`
`
`IS SOCKET
`IN TABLE?
`
`RETURN LOW
`LEVEL ERROR
`
`STORE THE PASSED
`NETWORK ADDRESS IN
`SOCKET STRUCTURE
`
`
`
`RETU RN
`
`
`
`FIG. 28
`
`000029
`
`000029
`
`

`
`Patent Application Publication May 30, 2002 Sheet 29 of 51
`
`US 2002/0066022 A1
`
`CONNECT
`
`BEGIN
`
`
`
`2910
`
`IS ADDRESS
`
`IN APPROVED
`LIST?
`
`2960
`
`RAISE VIRTUAL
`
`MACHINE
`ERROR
`
`Yes
`
`
`
`
`
`
`
`NO
`
`RETURN LOW
`LEVEL ERROR
`
`Yes
`
`293°
`
`IS STATUS
`VAEIBASOR
`CONNECT?
`
`Yes
`J
`
`2940
`
`UPDATE STATUS FLAG ENTRY TO
`BE CONNECTING
`
`NOTIFY PROXY
`
`
`
`RETURN
`
`
`
`FIG. 29
`
`000030
`
`
`
`
`
`
`/ 2920
`
`N°
`
`IS SOCKET
`IN TABLE?
`
`RETURN LOW
`LEVEL ERROR
`
`000030
`
`

`
`Patent Application Publication May 30, 2002 Sheet 30 of 51
`
`US 2002/0066022 A1
`
`LISTEN
`
`BEGIN
`
`
`
`
`
`
`3040
`
`IS SOCKET
`IN TABLE?
`
`RETURN LOW
`
`LEVEL ERROR
`
`Yes
`
`3020
`
`
`
`IS STATUS
`FLAG VALID
`FOR LISTEN?
`
`RETURN LOW
`LEVEL ERROR
`
`
`
`
`
`UPDATE STATUS FLAG TO LISTEN
`AND INITIALIZE CONNECTION
`QUEUE
`
`
`
`RETURN
`
`FIG. 30
`
`000031
`
`000031
`
`

`
`Patent Application Publication May 30, 2002 Sheet 31 of 51
`
`US 2002/0066022 A1
`
`QUERY
`
`BEGIN
`
`
`
`
`
`IS SOCKET IN
`
` RETURN LOW
`SOCKET TABLE?
`
`LEVEL ERROR
`
`RETRIEVE ENTRY FROM TABLE
`AND RETURN DATA
`
`
`
`FIG. 31
`
`000032
`
`000032
`
`

`
`Patent Application Publication May 30, 2002 Sheet 32 of 51
`
`US 2002/0066022 A1
`
`UPDATE
`
`BEGIN
`
`
`
`3230
`
` IS SOCKET ID
`
`RETURN LOW LEVEL
`ERROR
`
`IN TABLE?
`
`UPDATE STATUS OF CONDITIONS
`OR FLAGS
`
`
`
`RETU RN
`
`FIG. 32
`
`000033
`
`000033
`
`

`
`Patent Application Publication May 30, 2002 Sheet 33 of 51
`
`US 2002/0066022 A1
`
`BEGIN
`
`//, 3310
`REFUSE TO MAKE PAGE
`WITH EXECUTION
`
`PRIVILEGES READABLE
`
`3320
`
`No——
`
`REFUSE TO MAKE PAGE
`WITH EXECUTION
`PRIVILEGES WRITEABLE
`
`3330
`
`
`
`
`IS
`ATTEMPT
`TO MAKE PAGE
`EXECUTABLE?
`
`Yes
`
`3340
`
`CHECK PAGE FOR
`IMPROPER
`INSTRUCTION
`SEQUENCES
`
`3350
`
`INTERCEPT IMPROPER
`SEQUENCES FOUND
`
`3380
`
`Yes
`
`
`
`REFUSE TO MAKE PAGES
`
`CONTAINING THESE
`REMAINING NOT
`INTERCEPTED IMPROPER
`
`
`SEQUENCES EXECUTABLE
`
`
`
`No
`
`3370
`
`MAKE PAGES WITH NO IMPROPER
`SEQUENCES OR ONES WITH ALL
`IMPROPER SEQUENCES
`
`INTERCEPTED AS EXECUTABLE
`
`END
`
`FIG. 33
`
`000034
`
`3360
`
`
`
`WERE
`
`THERE ANY
`IMPROPER SEQUENCES
`OF INSTRUCTIONS NOT
`INTERCEPTED?
`
`
`
`
`
`000034
`
`

`
`Patent Application Publication May 30, 2002 Sheet 34 of 51
`
`US 2002/0066022 A1
`
`BEGIN
`
`3405
`
`3415
`
`3430
`
`CALL A
`WINDOW
`
`CREATE A
`MODAL
`
`DIALOG BOX
`
`SET WINDOW
`PROPERTIES
`
`3445
`
`BEFORE CALLING
`
`
`THE REAL
`OPERATING
`SYSTEM ROUTINE,
`
`REMOVE THE
`WINDOW STYLES
`
`THAT:
`
`-
`SHOW IT
`
`- MAKE IT VISIBLE
`°
`ACTIVATE IT
`
`MAKE IT THE
`
`FOCUS
`
`ETC.
`
`
`
`
`
`
`
`
`
`
`
`3435
`
`DO N_OT CREATE
`MODAL DIALOG BOX.
`INSTEAD RETURN A
`RESULT MOST
`LIKELY TO
`CONTINUE
`EXECUTION
`
`3460
`
`D‘ALO$OM\EiSAGE
`COMMUNICATION
`TH READ
`
`SET STYLE OF
`W'“D0W To
`"HIDE" OR
`
`
`
`
`
`
`
`DISABLE ASPECTS OF
`ROUTINE THAT AFFECT
`
`"'NV‘s“3'-E"
`
`ISIBLE ASPECT OF
`GRAPHICAL USER
`INTERFACE
`
`CALL THE
`ORIGINAL
`CREATE
`ROUTINE
`
` SEND MESSAGES
`
`PROPERTIES TO
`
`
`WINDOWS NOT ‘N
`
`
`APPLICATION
`PACKAGE ARE
`
`DISABLED
`
`
`
`RETURN
`
`FIG. 34
`
`000035
`
`CREATE
`
`WINDOW OR
`
`NORMAL DIALOG
`BOX CREATION
`
`
`
`
`
`
`ROUTINES THAT
`DIRECTLY:
`
`- SHOW WINDOW OR
`
`- ACTIVATE
`
`MAKE ITVISIBLE
`' DRAW
`FOCUS
`.
`- PAINT ETC.
`’
`
`
`
`
`COMMUNICATE AND SET WINDOW
`
`000035
`
`

`
`Patent Application Publication May 30, 2002 Sheet 35 of 51
`
`US 2002/0066022 Al
`
`CD
`
`BEGIN
`
`3505
`
`3520
`
`3535
`
`3545
`
`OPEN KEY
`
`0
`
`QUERY
`
`VALUE
`
`3510
`
`CLOSE KEY
`
`0
`
`SET VALUE
`
`3515
`
`
`
`/
`
`DELETE
`
`QUERYKEY
`
`3555
`
`3530
`
`
`
`3540
`
`
`
`CREATE KEY
`
`
`
`SAVE KEY
`
`3560
`
`RESTORE
`KEY
`
`3550
`
`REPLACE
`
`3525
`
`UPDATE KEY
`
`FIG. 35
`
`000036
`
`000036
`
`

`
`Patent Application Publication May 30, 2002 Sheet 36 of 51
`
`US 2002/0066022 A1
`
`OPEN KEY
`
`BEGIN
`
`
`
`3605
`
`LOOK IN VIRTUAL
`
`DATABASE FOR KEY
`
`
`
`IS KEY IN
`VIRTUAL
`DATABASE?
`
`Yes
`
`No
`
`
`
`3615
`
`ALLOWABLE LIST?
`
`DATABASE 3645
`ALLOCATE A HANDLE IN VIRTUAL DATABASE
`DATABASE
`
`IS KEY IN A
`
`PREDEHNED
`
`
`
`N0
`
`3620
`
`E
`INSERT FAKE K Y, VALUE,
`AND DATA IN VIRTUAL
`
`3625
`
`3630
`
`OPEN KEY IN REAL
`DATABASE
`
`Yes
`
`LOOK UP KEY IN
`PREDEFINED RUN-TIME
`CHANGE LIST
`
`CHANGE ALL VALUES IN
`PREDEFINED LIST
`
`3635
`
`3640
`
`3650
`
`WRITE KEY WITH ALL NEW
`AND UNCHANGED VALUES
`AND DATA TO VIRTUAL
`
`RETURN HANDLE
`
`RETURN
`
`FIG. 36
`
`000037
`
`000037
`
`

`
`Patent Application Publication May 30, 2002 Sheet 37 of 51
`
`US 2002/0066022 A1
`
`CLOSE KEY
`
`BEGIN
`
` 3720
`
`REMOVE KEY FROM
`ALLOCATED LIST
`
`IS KEY ALLOCATED
`IN VIRTUAL DATABASE?
`
`
`
`RETURN ERROR
`
`RETURN SUCCESS
`
`/// 3730
`
`
`
`RETURN
`
`FIG. 37
`
`000038
`
`000038
`
`

`
`Patent Application Publication May 30, 2002 Sheet 38 of 51
`
`US 2002/0066022 A1
`
`BEGIN
`
`
`
`
`
`QUERY SYSTEM USING FILE
`HANDLE TO GET FILENAME
`
`
`
` READ OR WRITE
`
`FILE
`
`IS FILE
`
`ENCRYPTED?
`
`3860
`
`IS
`READ
`REQUEST?
`
`READ AND
`DECRYPT FILE
`BUFFER
`
`
`
`
`
`
`N
`
`
`O (WRITE REQUEST)
`
`ENCRYPT AND WRITE
`FILE BUFFER
`
`
`
`RETU RN
`
`FIG. 38
`
`000039
`
`000039
`
`

`
`Patent Application Publication May 30, 2002 Sheet 39 of 51
`
`US 2002/0066022 A1
`
`BEGIN
`
`
`
`IDENTIFY ENCRYPTED
`BLOCKS CONTAINING
`REQUESTED DATA
`
`3910
`
`3920
`
`
`
`3930
`
`DECRYPT CONTENTS OF
`TEMPORARY BUFFER
`
`3940
`
`COPY DECRYPTED
`ADDRESS RANGE INTO
`ORIGINAL BUFFER
`
`
`
`RETURN
`
`
`
`FIG. 39
`
`000040
`
`
`
`
`
`READ ENCRYPTED
`BLOCKS FROM FILE
`SYSTEM INTO A
`TEMPORARY BUFFER
`
`000040
`
`

`
`Patent Application Publication May 30, 2002 Sheet 40 of 51
`
`US 2002/0066022 A1
`
`IDENTIFY ADDRESS RANGE
`TO BE WRITTEN TO
`
`READ ENCRYPTED BLOCKS CONTAINING
`CORRESPONDING ADDRESS RANGE
`FROM FILE SYSTEM INTO A TEMPORARY
`BUFFER
`
`DECRYPT CONTENTS OF
`TEMPORARY BUFFER
`
`4040
`
`COPY STORED BUFFER
`INTO TEMPORARY BUFFER
`
`4010
`
`
`
`
`
`
`
`4050
`
`4060
`
`ENCRYPT TEMPORARY
`BUFFER
`
`WRITE BUFFER TO DISK
`
`RETURN
`
`FIG. 40
`
`000041
`
`000041
`
`

`
`Patent Application Publication May 30, 2002 Sheet 41 of 51
`
`US 2002/0066022 A1
`
`BEGIN
`
`4110
`
`LOAD AND MAP FILE INTO
`MEMORY
`
`
`
`
`
`HAS FILE BEEN
`MODIFIED?
`
`
`
`
`CHECK FOR IMPROPER
`INSTRUCTION SEQUENCES
`
`IS FILE
`ENCRYPTED?
`
`RESERVE A REGION WITHOUT
`ALLOCATING PHYSICAL
`RESOURCES
`
`
`
`
`
`
`STORE IN MEMORY MAPPED
`TABLE A POINTER TO VIRTUAL
`BUFFER, POINTER TO REAL
`BUFFER, SIZE AND HANDLE
`
`
`
`RETURN POINTER TO VIRTUAL
`ADDRESS BUFFER
`
`
`
`
`
`
`418°
`
`RETURN POINTER TO
`REAL BUFFER
`
`RETURN
`
`FIG. 41
`
`000042
`
`000042
`
`

`
`Patent Application Publication May 30, 2002 Sheet 42 of 51
`
`US 2002/0066022 A1
`
`BEGIN
`
`4210
`
`LOAD AND MAP FILE
`INTO MEMORY
`
`ALTERNATE TO F|G.41)
`
`
`IS FILE
`ENCRYPTED?
`
`
`
`Yes
`
`4230
`
`/
`
`CREATE A VIRTUAL BUFFER
`CONTAINING DECRYPTED
`DATA FROM REAL BUFFER
`
`REAL BUFFER
`
`RETURN POINTER TO
`
`4240
`
`RETURN POINTER TO
`VIRTUAL BUFFER
`
`RETURN
`
`FIG. 42
`
`000043
`
`000043
`
`

`
`Patent Application Publication May 30, 2002 Sheet 43 of 51
`
`US 2002/0066022 A1
`
`BEGIN
`
`
`
`4310
`
`IS BUFFER REAL
`BUFFER OR
`VIRTUAL?
`
`
`
`IDENTIFY WHICH PORTIONS
`OF BUFFER HAVE BEEN
`MODIFIED
`
`ENCRYPT IDENTIFIED
`PORTIONS OF MEMORY INTO
`REAL BUFFER
`
`
`
`CALL OPERATING SYSTEM
`WITH REAL BUFFER
`
`
`
`RETURN
`
`
`
`FIG. 43
`
`000044
`
`000044
`
`

`
`Patent Application Publication May 30, 2002 Sheet 44 of 51
`
`US 2002/0066022 A1
`
`BEGIN
`
`EXECUTE REQUESTED
`ROUTINE
`
`
`
`DECRYPT EACH OF THE
`RETURNED FILENAMES
`
`
`
`RETURN
`
`FIG. 44
`
`000045
`
`000045
`
`

`
`Patent Application Publication May 30, 2002 Sheet 45 of 51
`
`US 2002/0066022 A1
`
`BEGIN
`
`
`
` 4500
`
`IS FILE
`
`LOCATED IN NON-
`
`ENCRYPTED
`DIRECTORY?
`
`4510
`
`IDENTIFY ENCRYPTED
`PORTIONS OF PATHNAME
`USING PREFIX AND
`POSTFIX SYMBOLS
`
`4520
`
`DECRYPT THE ENCRYPTED
`PART OF THE PATHNAME
`
`
`
`4530
`
`ENCRYPT THE FULL
`PATHNAME
`
`RETURN
`
`FIG. 45
`
`000046
`
`000046
`
`

`
`Patent Application Publication May 30, 2002 Sheet 46 of 51
`
`US 2002/0066022 A1
`
`TRADITIONAL
`SYTEM LAYOUT
`
`/ EXE FILE
`/ \
`
`APP DIR —— DATA FILE
`
`APP WORKSPACE
`
`C;——-— SYSTEM FILES
`
`TMP
`
`FIG. 46
`
`000047
`
`000047
`
`

`
`Patent Application Publication May 30, 2002 Sheet 47 of 51
`
`US 2002/0066022 A1
`
`VIRTUALIZED
`SYTEM LAYOUT
`
`EXE FILE
`
`APP DIR—— DATA FILE
`
`J \ UBRARY
`APPWORKSPACE < 01* TMP
`/+
`D2
`VIRTUAL ROOT
`
`SANDBOX
`/ LAYER
`
`C_
`
`SYSTEM FILE
`
`FIG. 47
`
`000048
`
`000048
`
`

`
`Patent Application Publication
`
`May 30, 2002 Sheet 48 of 51
`
`US 2002/0066022 A1
`
`om5m_zzoom_o-
`
`omfiomzzoo-
`
`om»<z_s_mm:-
`
`Z\SOQ._.3Iw.
`
`ozsom.
`
`OZ_._.0m_ZZO0-
`
`oz_>_momm-
`
`oz_zm:.w:-
`
`ozazmw-
`
`
`
`
`
`omtomzzooza-wabfimExoom
`
`wv.O_u_
`
`
`
`mm_mmm_moo<v_mo>>E2-
`
`m._ooo»omn_.
`
`mZO_._.n_O.
`
`oz_xoo._m-
`
`._.zm>m_-
`
`>._:>_<n_-
`
`
`Exoomm_DO_ZD. m_n_?_.Exoom-D.
`
`
`m_m:53m.5.m_v_oom
`
`
`
`
`
`Nmmvmum?vmwvcame
`
`
`
`
`
`zofiomzzoom>_mommozmmExoom
`
`
`
`m_._m_<._.Exoom
`
`
`
`mamasmamaomamacmzo_Eo
`
`
`
`
`
`oav
`
`N_mv
`
`«em?
`
`Egoow
`
`wabfim
`
`
`
`m:o_2mE_.>Ezm._
`
`mmaposmkwmmEosmbm
`
`
`
`ExoowExoom:_<OO._
`
`82
`
`000049
`
`000049
`
`
`
`
`
`
`
`

`
`Patent Application Publication May 30, 2002 Sheet 49 of 51
`
`US 2002/0066022 A1
`
`
`
`
`
`SEND CREATE OR
`TERMINATE
`MESSAGE TO
`APPLICATION
`MANAGER WITH
`PROCESS ID
`
`IS EVENT
`PROCESS
`CREATE OR
`TERMINATE?
`
`
`
`SEND ERROR OR
`IS EVENT
`
`MESSAGE TO
`AN ERROR
`OR DIALOG
`APPLICATION
`MANAGER
`MESSAGE?
`
`
`
`
`
`
`
`IS EVENT
`FROM
`APPLICATION
`MANAGER’?
`
`Yes
`
`PROCESS
`APPLICATION
`MANAGER EVENT
`
`
`
`
`
`
`
`
`
`Yes
`
`PROCESS
`
`APPLICATION EVENT
`
`IS EVENT
`FROM
`APPLICATION?
`
`
`
`
`
`4940
`
`UNKNOWN EVENT
`SEND ERROR TO
`APPLICATION MANAGER
`
`
`
`F|G.49
`
`000050
`
`
`
`000050
`
`

`
`Patent Application Publication May 30, 2002 Sheet 50 of 51
`
`US 2002/0066022 A1
`
`BEGIN
`
`
`
`5000
`
`PAUSE
`
`5005
`
`5040
`
`RESUME
`
`CHECKPOINT
`
`MAKE LIST OF
`ALL THREADS IN
`
`PROCESS
`
`5005
`
`CALL RESUME THREAD
`ON ALL THREADS IN
`
`5030
`
`SUSPEND LIST
`
`DOES
`
`
`APPLICATION HAVE A
`"CHECKPOINT"
`
`
`ROUTINE?
`
`
`No -
`
`
`
`
`REMOVE THREAD
`FROM SUSPEND LIST
`ONCE IT IS RESUMED
`
`5035
`
`Yes
`
`CALL CHECKPOINT
`ROUTINE IN
`APPLICATION
`
`5045
`
`5°”
`
`5015
`
`5020
`
`RETURN SUCCESS oR FAILURE
`
`EVENT TO APPLICATION MANAGER
`
`5°25
`
`END
`
`FIG. 50
`
`000051
`
`
`SUSPENDED THREADS
`
`REMOVE FROM LIST
`VM THREADS
`
`SUSPEND ALL
`THREADS REMAINING
`IN THIS "SUSPEND"
`LIST
`
`STORE THE LIST OF
`
`000051
`
`

`
`Patent Application Publication May 30, 2002 Sheet 51 of 51
`
`US 2002/0066022 A1
`
`BEGIN
`
`
`
`
`
`
`RESULT FILE
`COMPLETION PROGRESS
`
`5105
`
`
`
`
`SEND PROGRESS
`STATISTICS TO
`APPLICATION MANAGER SEND FINISHED RESULT
`FILENAME AND LOCATION
`TO APPLICATION MANAGER
`
`5115
`
`FIG. 51
`
`000052
`
`000052
`
`

`
`US 2002/0066022 A1
`
`May 30, 2002
`
`SYSTEM AND METHOD FOR SECURING AN
`APPLICATION FOR EXECUTION ON A
`COMPUTER
`
`RELATED APPLICATIONS
`
`[0001] This application relates to the following co-owned
`and co-pending U.S. Patent Applications, which are each
`incorporated by reference herein in their entirety: U.S.
`patent application Ser. No.
`, “METHOD AND PRO-
`CESS FOR SECURING AN APPLICATION PROGRAM
`TO EXECUTE IN A REMOTE ENVIRONMENT”, filed
`Nov. 29, 2000; U.S. patent application Ser. No.
`,
`“METHOD AND PROCESS FOR THE REWRITING OF
`BINARIES TO INTERCEPT SYSTEM CALLS IN A
`SECURE EXECUTION ENVIRONMENT”, filed Nov. 29,
`2000; U.S. patent application Ser. No.
`, “METHOD
`AND PROCESS FOR VIRTUALIZING FILE SYSTEM
`
`INTERFACES”, filed Nov. 29, 2000; U.S. patent application
`Ser. No.
`, “METHOD AND PROCESS FOR THE
`VIRTUALIZATION OF SYSTEM DATABASES AND
`STORED INFORMATION”,
`filed Nov. 29, 2000; U.S.
`patent application Ser. No.
`, “METHOD AND PRO-
`CESS FOR VIRTUALIZING NETWORK INTERFACES”,
`filed Nov. 29, 2000; U.S. patent application Ser. No.
`,
`“METHOD AND PROCESS FOR VIRTUALIZING USER
`
`INTERFACES”, filed Nov. 29, 2000; and U.S. patent appli-
`cation Ser. No.
`, “SYSTEM AND METHOD FOR
`COMMUNICATING AND
`CONTROLLING
`THE
`BEHAVIOR OF AN APPLICATION EXECUTING ON A
`COMPUTER”, filed Nov. 29, 2000.
`
`FIELD OF THE INVENTION
`
`[0002] The invention relates to distributed computing, and
`more particularly, relates to secure peer-to-peer Internet or
`enterprise distributed computing. The invention also relates
`to the secure execution of an application on a client com-
`puter.
`
`DESCRIPTION OF THE RELATED
`TECHNOLOGY
`
`[0003] Distributed computing systems offer a wide variety
`of resources that can be harnessed and collected so as to
`
`work toward a common goal. Until recently, distributed
`computing has been performed predominantly on secure
`networks, wherein each of the computers in the network are
`owned by a single entity, such as a business. However,
`recently some individuals have attempted to implement
`distributed computing systems across the Internet, which
`includes millions of heterogeneous and non-secure comput-
`ers. An example of the is the GIMPS project that utilizes
`various computers that are provided by homeowners, busi-
`nesses, and universities to search for new Mersenne primes
`(primes of the form 2p—1).
`
`[0004] Although utilizing the Internet for distributed com-
`puting has met with limited success for certain projects, lack
`of security on the Internet makes it difficult to utilize the
`Internet for other types of projects. For example, many
`projects are of a confidential nature. Thus, project owners
`may be reluctant to utilize the computers of non-trusted
`individuals for these types of projects.
`
`[0005] Another problem with distributing computing on
`the Internet is that for similar security concerns described
`
`above, many consumers, e.g. individuals, businesses, uni-
`versities, are unwilling to allow third party software to be
`run on their machines. By allowing a distributed process to
`execute on the consumer’s machine, the task may, among
`other things:
`cause a system malfinction; (ii) improperly
`access confidential information; or (iii) otherwise adversely
`affect the performance of their computer.
`
`[0006] Thus, there is a need for a distributed computing
`system that will allow a project to be executed securely
`across the Internet using non-secure trusted machines. The
`system should protect
`the contents of the project from
`improper tampering at the user machine. Furthermore, the
`system should protect
`the non-secure machine from
`improper tampering by the project.
`
`SUMMARY OF THE INVENTION
`
`[0007] One aspect of the invention comprises a prepro-
`cessor module for scanning the application program for code
`sequences that cause the computer to trap to the operating
`system and for modifying the code sequences such that the
`computer does not trap to the operating system, a server
`computer for receiving at least one application that has been
`modified by the preprocessor module, a network, and a
`client computer operably connected to the server computer
`via the network, wherein the client computer receives the
`modified application from the server computer, wherein
`subsequent to receiving the application, the client computer
`executes the application.
`
`[0008] Another aspect of the invention comprises scan-
`ning the application for code sequences that cause the
`computer to trap to the operating system, and modifying the
`code sequences such that the computer does not trap to the
`operating system.
`
`[0009] Yet another aspect of the invention comprises load-
`ing the application, marking all of the code pages of the
`loaded application execute only, and preventing the appli-
`cation from creating executable data during the execution of
`the application.
`
`[0010] Yet another aspect of the invention comprises pre-
`venting the application from creating executable data during
`the execution of the application, scanning the application for
`code sequences that cause the computer to trap to the
`operating system, and modifying the code sequences such
`that the computer does not trap to the operating system.
`
`[0011] Yet another aspect of the invention comprises pre-
`venting the application from creating executable data during
`the execution of the application, and preventing at least one
`code page of the application from becoming readable and
`writeable.
`
`[0012] Yet another aspect of the invention comprises load-
`ing the application, marking all of the data pages of the
`loaded application read and write only, and preventing the
`application from creating executable data during the execu-
`tion of the application.
`
`[0013] Yet another aspect of the invention comprises pre-
`venting the application from creating executable data during
`the execution of the application, and preventing the appli-
`cation from modifying executable files or executing any
`application generated files.
`
`OOOO53
`
`000053
`
`

`
`US 2002/0066022 A1
`
`May 30, 2002
`
`[0014] Yet another aspect of the invention comprises
`before the execution of an application program, scanning the
`application program for code sequences that cause the
`computer to trap to the operating system, before the execu-
`tion of
`the application program, modifying the code
`sequences such that
`the computer does not
`trap to the
`operating system, during or subsequent to the execution of
`the application program, scanning executable data that is
`created by the application program for sequences that trap to
`the operating system, and during or subsequent
`to the
`execution of the application program, scanning new execut-
`able files that are created or modified by the application
`program, and during or subsequent to the execution of the
`application program, modifying the executable data and the
`new files such that the application program does not trap to
`the operating system.
`
`[0015] Yet another aspect of the invention comprises scan-
`ning the application for code sequences that cause the
`computer to trap to the operating system, modifyi