IP Library › Granted Patent US 12,242,575
Granted Patent B2
US 12,242,575 · App. 18/348,388 · Granted Mar 4, 2025

Systems and methods for policy linking and/or loading for secure initialization

Inventors: Eli Boling (Manchester, MA); Steven Milburn (Cranston, RI); Gregory T. Sullivan (Rockport, MA); Andrew Sutherland (Portland, OR)
Assignee: Dover Microsystems, Inc.
G06F21/125G06F8/41G06F8/447G06F8/52G06F8/54G06F9/44505G06F21/121G06F21/51G06F21/52G06F21/54H04L9/3247
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Quick Facts
Patent No.
US 12,242,575
App. No.
18/348,388
Granted
Mar 4, 2025
Kind
B2
Abstract

A system including at least one processor programmed to identify, based on a policy to be enforced, one or more metadata symbols corresponding to an entity name; identify, from a target description describing a target system, an entity description matching the entity name, wherein the entity description describes an entity of the target system; and apply a metadata label to the entity of the target system, wherein the metadata label is based on the one or more metadata symbols corresponding to the entity name, as identified based on the policy.

Claims (106)

1. A system comprising:

at least one hardware processor programmed to:

identify, based on a policy to be enforced, one or more metadata symbols corresponding to an entity name;

identify, from a target description describing a target system, an entity description matching the entity name, wherein the entity description describes an entity of the target system; and

apply a metadata label to the entity of the target system, wherein:

the metadata label is based on the one or more metadata symbols corresponding to the entity name, as identified based on the policy;

the at least one hardware processor is further programmed to generate an initialization specification based at least in part on the policy and the target description;

the at least one hardware processor is programmed to apply the metadata label to the entity at least in part by including, in the initialization specification, an indication that the entity is associated with the metadata label;

the at least one hardware processor is further programmed to resolve the metadata label, which is based on the one or more metadata symbols, into a binary representation; and

the binary representation of the metadata label is included in the initialization specification.

2. The system of claim 1 , wherein:

the policy is to be enforced during execution of object code of one or more programs;

the object code is output by a compiler toolchain in a loadable binary format; and

the at least one hardware processor is programmed to apply the metadata label to the entity at least in part by, prior to execution of the object code, annotating at least one portion of the object code with the binary representation of the metadata label.

3. The system of claim 2 , wherein:

the at least one hardware processor is further programmed to identify the at least one portion of the object code to be annotated, at least in part by:

using the entity description to identify one or more object symbol names and one or more address ranges associated with the entity; and

identifying, from the object code, based on the one or more address ranges, one or more instructions matching the one or more object symbol names; and

annotating the at least one portion of the object code comprises annotating the one or more instructions identified from the object code with the binary representation of the metadata label.

4. The system of claim 1 , wherein the at least one hardware processor is further programmed to:

in response to a piece of object code being loaded to a location in an application memory, identify, based on the initialization specification, at least one metadata label associated with the piece of object code, wherein the piece of object code comprises one or more executable instructions and/or data to be manipulated by one or more executable instructions; and

associate the location in the application memory, where the piece of object code is loaded, with the at least one metadata label.

5. The system of claim 4 , wherein:

the at least one hardware processor is programmed to associate the location in the application memory with the at least one metadata label at least in part by creating an entry in a tag map table, the entry mapping the location in the application memory to the at least one metadata label, wherein:

the entry in the tag map table stores a binary representation of the at least one metadata label and/or information indicative of a location at which a binary representation of the at least one metadata label is stored.

6. The system of claim 5 , wherein:

the information comprises:

an address in a metadata memory at which the binary representation of the at least one metadata label is stored, and/or

an identifier for a register at which the binary representation of the at least one metadata label is stored.

7. The system of claim 5 , further comprising policy enforcement hardware, wherein:

the at least one hardware processor is programmed to associate the location in the application memory with the at least one metadata label at least in part by causing the policy enforcement hardware to evaluate one or more rules;

evaluation of the one or more rules comprises looking up the tag map table for an entry corresponding to the location in the application memory; and

the policy enforcement hardware is configured to, in response to determining that the tag map table does not already include an entry corresponding to the location in the application memory, create the entry in the tag map table mapping the location in the application memory to the at least one metadata label.

8. The system of claim 4 , wherein:

the at least one hardware processor is further programmed to resolve the at least one metadata label into at least one binary representation; and

associating the location in the application memory with the at least one metadata label comprises associating the location in the application memory with the at least one binary representation of the at least one metadata label.

9. The system of claim 8 , wherein:

the piece of object code comprises object code of a user application that is loaded dynamically; and

the at least one hardware processor is programmed to:

dynamically resolve the at least one metadata label into the at least one binary representation; and

dynamically associate the location in the application memory with the at least one binary representation of the at least one metadata label.

10. The system of claim 4 , wherein:

the initialization specification is in a loadable binary format;

the at least one hardware processor is further programmed to confirm that the initialization specification is from a trusted source, at least in part by verifying a cryptographic signature on the initialization specification; and

the at least one hardware processor is programmed to associate the location in the application memory with the at least one metadata label only in response to confirming that the initialization specification is from a trusted source.

11. The system of claim 4 , further comprising policy enforcement hardware, wherein:

the at least one metadata label comprises a default metadata label;

the at least one hardware processor is further programmed to cause the policy enforcement hardware to evaluate one or more rules; and

evaluation of the one or more rules causes the policy enforcement hardware to replace the default metadata label with another metadata label.

12. A method performed by a system comprising at least one processor, the method comprising acts of:

identifying, based on a policy to be enforced, one or more metadata symbols corresponding to an entity name;

identifying, from a target description describing a target system, an entity description matching the entity name, wherein the entity description describes an entity of the target system; and

applying a metadata label to the entity of the target system, wherein:

the metadata label is based on the one or more metadata symbols corresponding to the entity name, as identified based on the policy;

the method further comprises an act of generating an initialization specification based at least in part on the policy and the target description;

applying the metadata label to the entity comprises including, in the initialization specification, an indication that the entity is associated with the metadata label;

the method further comprises an act of resolving the metadata label, which is based on the one or more metadata symbols, into a binary representation; and

the binary representation of the metadata label is included in the initialization specification.

13. The method of claim 12 , wherein:

the policy is to be enforced during execution of object code of one or more programs;

the object code is output by a compiler toolchain in a loadable binary format; and

applying the metadata label to the entity comprises, prior to execution of the object code, annotating at least one portion of the object code with the binary representation of the metadata label.

14. The method of claim 13 , further comprising an act of:

identifying the at least one portion of the object code to be annotated, at least in part by:

using the entity description to identify one or more object symbol names and one or more address ranges associated with the entity; and

identifying, from the object code, based on the one or more address ranges, one or more instructions matching the one or more object symbol names; and

annotating the at least one portion of the object code comprises annotating the one or more instructions identified from the object code with the binary representation of the metadata label.

15. The method of claim 12 , further comprising acts of:

in response to a piece of object code being loaded to a location in an application memory, identifying, based on the initialization specification, at least one metadata label associated with the piece of object code, wherein the piece of object code comprises one or more executable instructions and/or data to be manipulated by one or more executable instructions; and

associating the location in the application memory, where the piece of object code is loaded, with the at least one metadata label.

16. The method of claim 15 , wherein:

associating the location in the application memory with the at least one metadata label comprises creating an entry in a tag map table, the entry mapping the location in the application memory to the at least one metadata label, wherein:

the entry in the tag map table stores a binary representation of the at least one metadata label and/or information indicative of a location at which a binary representation of the at least one metadata label is stored.

17. The method of claim 16 , wherein:

the information comprises:

an address in a metadata memory at which the binary representation of the at least one metadata label is stored, and/or

an identifier for a register at which the binary representation of the at least one metadata label is stored.

18. The method of claim 16 , wherein:

the system further comprises policy enforcement hardware;

associating the location in the application memory with the at least one metadata label comprises causing the policy enforcement hardware to evaluate one or more rules;

evaluation of the one or more rules comprises looking up the tag map table for an entry corresponding to the location in the application memory; and

in response to determining that the tag map table does not already include an entry corresponding to the location in the application memory, creating, by the policy enforcement hardware, the entry in the tag map table mapping the location in the application memory to the at least one metadata label.

19. The method of claim 15 , further comprising an act of:

resolving the at least one metadata label into at least one binary representation, wherein associating the location in the application memory with the at least one metadata label comprises associating the location in the application memory with the at least one binary representation of the at least one metadata label.

20. The method of claim 19 , wherein:

the piece of object code comprises object code of a user application that is loaded dynamically;

the at least one metadata label is dynamically resolved into the at least one binary representation; and

the location in the application memory is dynamically associated with the at least one binary representation of the at least one metadata label.

21. The method of claim 15 , wherein:

the initialization specification is in a loadable binary format;

the method further comprises an act of confirming that the initialization specification is from a trusted source, at least in part by verifying a cryptographic signature on the initialization specification; and

the location in the application memory is associated with the at least one metadata label only in response to confirming that the initialization specification is from a trusted source.

22. The method of claim 15 , wherein:

the system further comprises policy enforcement hardware;

the at least one metadata label comprises a default metadata label;

the method further comprises an act of causing the policy enforcement hardware to evaluate one or more rules; and

evaluation of the one or more rules causes the policy enforcement hardware to replace the default metadata label with another metadata label.

23. At least one non-transitory computer-readable medium having encoded thereon instructions which, when executed by at least one processor, cause the at least one processor to:

identify, based on a policy to be enforced, one or more metadata symbols corresponding to an entity name;

identify, from a target description describing a target system, an entity description matching the entity name, wherein the entity description describes an entity of the target system; and

apply a metadata label to the entity of the target system, wherein:

the metadata label is based on the one or more metadata symbols corresponding to the entity name, as identified based on the policy;

the at least one processor is further programmed by the instructions to generate an initialization specification based at least in part on the policy and the target description;

the at least one processor is programmed by the instructions to apply the metadata label to the entity at least in part by including, in the initialization specification, an indication that the entity is associated with the metadata label;

the at least one processor is further programmed by the instructions to resolve the metadata label, which is based on the one or more metadata symbols, into a binary representation; and

the binary representation of the metadata label is included in the initialization specification.

Assignments (1)
CORRECTIVE ASSIGNMENT TO CORRECT THE APPLICATION NUMBER PREVIOUSLY RECORDED ON REEL 064511 FRAME 0085. ASSIGNOR(S) HEREBY CONFIRMS THE ASSIGNMENT. Recorded Aug 22, 2023
From: BOLING, ELI; MILBURN, STEVEN; SULLIVAN, GREGORY TIMOTHY; SUTHERLAND, ANDREW
To: DOVER MICROSYSTEMS, INC.
Reel/Frame 064659/0971 →
Continuity (5)
Continuation 17711092 · Apr 1, 2022
Continuation 16966616
Provisional Application 62635289 · Feb 26, 2018
Provisional Application 62625822 · Feb 2, 2018
Related Publication 20240045932A1 · Feb 8, 2024
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