GB2411027A - Control of access to a memory by a device - Google Patents

Control of access to a memory by a device Download PDF

Info

Publication number
GB2411027A
GB2411027A GB0507886A GB0507886A GB2411027A GB 2411027 A GB2411027 A GB 2411027A GB 0507886 A GB0507886 A GB 0507886A GB 0507886 A GB0507886 A GB 0507886A GB 2411027 A GB2411027 A GB 2411027A
Authority
GB
United Kingdom
Prior art keywords
memory
secure
data
access
processing apparatus
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
GB0507886A
Other versions
GB0507886D0 (en
GB2411027B (en
Inventor
Simon Charles Watt
Lionel Belnet
David Hennah Mansell
Nicholas Chaussade
Peter Guy Middleton
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ARM Ltd
Original Assignee
ARM Ltd
Advanced Risc Machines Ltd
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
Priority claimed from GB0226875A external-priority patent/GB0226875D0/en
Priority claimed from GB0226879A external-priority patent/GB0226879D0/en
Priority claimed from GB0303446A external-priority patent/GB0303446D0/en
Application filed by ARM Ltd, Advanced Risc Machines Ltd filed Critical ARM Ltd
Publication of GB0507886D0 publication Critical patent/GB0507886D0/en
Publication of GB2411027A publication Critical patent/GB2411027A/en
Application granted granted Critical
Publication of GB2411027B publication Critical patent/GB2411027B/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/30—Monitoring
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F12/00—Accessing, addressing or allocating within memory systems or architectures
    • G06F12/14—Protection against unauthorised use of memory or access to memory
    • G06F12/1458—Protection against unauthorised use of memory or access to memory by checking the subject access rights
    • G06F12/1491—Protection against unauthorised use of memory or access to memory by checking the subject access rights in a hierarchical protection system, e.g. privilege levels, memory rings
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F12/00—Accessing, addressing or allocating within memory systems or architectures
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F12/00—Accessing, addressing or allocating within memory systems or architectures
    • G06F12/14—Protection against unauthorised use of memory or access to memory
    • G06F12/1458—Protection against unauthorised use of memory or access to memory by checking the subject access rights
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F15/00—Digital computers in general; Data processing equipment in general
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/60—Protecting data
    • G06F21/62—Protecting access to data via a platform, e.g. using keys or access control rules
    • G06F21/6218—Protecting access to data via a platform, e.g. using keys or access control rules to a system of files or objects, e.g. local or distributed file system or database
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/70—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer
    • G06F21/71—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer to assure secure computing or processing of information
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/70—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer
    • G06F21/71—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer to assure secure computing or processing of information
    • G06F21/74—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer to assure secure computing or processing of information operating in dual or compartmented mode, i.e. at least one secure mode
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/70—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer
    • G06F21/78—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer to assure secure storage of data
    • G06F21/79—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer to assure secure storage of data in semiconductor storage media, e.g. directly-addressable memories
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/70—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer
    • G06F21/82—Protecting input, output or interconnection devices
    • G06F21/85—Protecting input, output or interconnection devices interconnection devices, e.g. bus-connected or in-line devices
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2221/00—Indexing scheme relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F2221/21—Indexing scheme relating to G06F21/00 and subgroups addressing additional information or applications relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F2221/2105—Dual mode as a secondary aspect
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2221/00—Indexing scheme relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F2221/21—Indexing scheme relating to G06F21/00 and subgroups addressing additional information or applications relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F2221/2141—Access rights, e.g. capability lists, access control lists, access tables, access matrices
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2221/00—Indexing scheme relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F2221/21—Indexing scheme relating to G06F21/00 and subgroups addressing additional information or applications relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F2221/2149—Restricted operating environment

Abstract

The present invention provides a data processing apparatus and method for controlling access to a memory. The data processing apparatus has a secure domain and a non-secure domain, in the secure domain the data processing apparatus having access to secure data which is not accessible in the non-secure domain. The data processing apparatus comprises a device coupled to a memory via a device bus, and operable, when an item of data in the memory is required by the device, to issue onto the device bus a memory access request pertaining to either the secure domain or the non-secure domain. The memory is operable to store data required by the device, and contains secure memory for storing secure data and non-secure memory for storing non-secure data. In accordance with the present invention, the data processing apparatus further comprises partition checking logic coupled to the device bus and operable whenever the memory access request as issued by the device pertains to the non-secure domain, to detect if the memory access request is seeking to access the secure memory and upon such detection to prevent the access specified by that memory request. This approach significantly improves the security of data contained within a secure portion of memory.

Description

GB 2411027 A continuation (72) Inventor(s): Simon Charles Watt Lionel
Belnet David Hennah Mansell Nicholas Chaussade Peter Guy Middleton (74) Agent and/or Address for Service: D Young & Co Holborn, LONDON, EC1N 2DY, United Kingdom
GB0507886A 2002-11-18 2003-10-27 Control of access to a memory by a device Expired - Lifetime GB2411027B (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB0226875A GB0226875D0 (en) 2002-11-18 2002-11-18 Control of access to a memory by a device
GB0226879A GB0226879D0 (en) 2002-11-18 2002-11-18 Apparatus and method for controlling access to a memory
GB0303446A GB0303446D0 (en) 2002-11-18 2003-02-14 Apparatus and method for controlling access to a memory
PCT/GB2003/004629 WO2004046934A2 (en) 2002-11-18 2003-10-27 Secure memory for protecting against malicious programs

Publications (3)

Publication Number Publication Date
GB0507886D0 GB0507886D0 (en) 2005-05-25
GB2411027A true GB2411027A (en) 2005-08-17
GB2411027B GB2411027B (en) 2006-03-15

Family

ID=32329547

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0507886A Expired - Lifetime GB2411027B (en) 2002-11-18 2003-10-27 Control of access to a memory by a device

Country Status (7)

Country Link
US (1) US7305534B2 (en)
EP (1) EP1563388A2 (en)
JP (1) JP4302641B2 (en)
KR (1) KR101015456B1 (en)
AU (1) AU2003278350A1 (en)
GB (1) GB2411027B (en)
WO (1) WO2004046934A2 (en)

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Also Published As

Publication number Publication date
JP4302641B2 (en) 2009-07-29
US7305534B2 (en) 2007-12-04
WO2004046934A2 (en) 2004-06-03
US20040177261A1 (en) 2004-09-09
EP1563388A2 (en) 2005-08-17
AU2003278350A1 (en) 2004-06-15
AU2003278350A8 (en) 2004-06-15
KR20050085000A (en) 2005-08-29
GB0507886D0 (en) 2005-05-25
KR101015456B1 (en) 2011-02-22
JP2006506754A (en) 2006-02-23
WO2004046934A3 (en) 2005-06-16
GB2411027B (en) 2006-03-15

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