Atomic detection and repair of kernel memory
A method for detecting memory modifications includes allocating a contiguous block of a memory of an electronic device, and loading instructions for detecting memory modifications into the contiguous block of memory. The electronic device includes a plurality of processing entities. The method also includes disabling all but one of a plurality of processing entities of the electronic device, scanning the memory of the electronic device for modifications performed by malware, and, if a memory modification is detected, repairing the memory modification. The method also includes enabling the processing entities that were disabled. The remaining processing entity executes the instructions for detecting memory modifications.
1. A method for detecting memory modifications, comprising:
allocating a contiguous block of a memory of an electronic device, the electronic device comprising a plurality of processing cores;
loading instructions for detecting memory modifications into the contiguous block of memory;
disabling the operation of an operating system of the electronic device by disabling one or more of system interrupts, user interrupts, or scheduler timer interrupts;
disabling all but one of the plurality of processing cores of the electronic device, the remaining processing core executing the instructions for detecting memory modifications;
scanning the memory of the electronic device for modifications performed by malware, after disabling all but one of the plurality of processing cores and disabling one or more of system interrupts, user interrupts, or scheduler timer interrupts;
enabling the one or more of the system interrupts, user interrupts, or scheduler timer interrupts that were disabled, after scanning the memory of the electronic device for modifications; and
enabling the processing cores that were disabled, after scanning the memory of the electronic device for modifications.
2. The method of claim 1 , wherein:
loading instructions for detecting memory modifications into the contiguous block of memory comprises loading the entirety of the instructions within the contiguous block; and
disabling all but one of the plurality of processing cores of the electronic device, the remaining processing core executing the instructions for detecting memory modifications comprises executing the instructions as resident within the contiguous block.
3. The method of claim 1 , further comprising repairing a memory modification detected during scanning the memory of the electronic device for modifications performed by malware, before enabling the one or more system interrupts, user interrupts, or scheduler timer interrupts that were disabled.
4. The method of claim 1 , wherein the memory modifications comprise modifications to kernel memory.
5. The method of claim 1 , wherein the memory modifications comprise modifications to application memory.
6. The method of claim 1 , wherein the contiguous block of memory is allocated in non-pageable memory.
7. The method of claim 1 , further comprising, before disabling all but one of the plurality of processing cores of the electronic device, modifying an affinity associated with the loaded instructions to one of the plurality of processing cores of the electronic device, wherein the processing core is the remaining processing core for executing the instructions for detecting memory modifications.
8. The method of claim 1 , further comprising:
subsequent to disabling the operating system, enabling the operating system to access a system function, the system function used for repair or diagnosis of memory; and
subsequently disabling the operating system after utilizing the system function.
9. The method of claim 1 , wherein the processing cores of the electronic device are shut down using an operating system service.
10. The method of claim 1 , further comprising:
detecting a memory modification during scanning of the memory of the electronic device;
enabling a system resource, wherein the system resource is the one or more disabled processing cores, or the one or more disabled system interrupts, user interrupts, or scheduler timer interrupts;
in response to detecting a memory modification, repairing the memory modification; and
disabling the system resource after repairing the memory modification.
11. An article of manufacture, comprising:
a non-transitory computer readable medium; and
computer-executable instructions carried on the non-transitory computer readable medium, the instructions readable by a processor, the instructions, when read and executed, for causing the processor to:
allocate a contiguous block of a memory of an electronic device, the electronic device comprising a plurality of processing cores;
load instructions for detecting memory modifications into the contiguous block of memory;
disable the operation of an operating system of the electronic device by disabling one or more of system interrupts, user interrupts, or scheduler timer interrupts;
disable all but one processing cores of the electronic device, the remaining processing core for executing the instructions for detecting memory modifications;
scan the memory of an electronic device for modifications performed by malware, after all but one of the plurality of processing cores is disabled and one or more of system interrupts, user interrupts, or scheduler timer interrupts is disabled;
enable the one or more of system interrupts, user interrupts, or scheduler timer interrupts that were disabled, after the scan of the memory of the electronic device for modifications; and
enable the processing cores that were disabled, after the scan of the memory of the electronic device for modifications.
12. The article of claim 11 , wherein:
the entirety of the instructions for detecting memory modifications are loaded within the contiguous block; and
the instructions for detecting memory modifications that are executed by the remaining processing core are resident within the contiguous block.
13. The article of claim 11 , wherein the processing is further caused to repair a memory modification detected during the scan of the memory of the electronic device for modifications performed by malware, before the one or more disabled system interrupts, user interrupts, or scheduler timer interrupts is enabled.
14. The article of claim 11 , wherein the memory modifications comprise modifications to kernel memory.
15. The article of claim 11 , wherein the memory modifications comprise modifications to application memory.
16. The article of claim 11 , wherein the contiguous block of memory is allocated in non-pageable memory.
17. The article of claim 11 , wherein the processing is further caused to, before all but one of the plurality of processing cores of the electronic device are disabled, modify an affinity associated with the loaded instructions to one of the plurality of processing cores of the electronic device, wherein the processing core is the remaining processing core for executing the instructions for detecting memory modifications.
18. The article of claim 11 , wherein the processing is further caused to:
subsequent to disabling the operating system, enable the operating system to access a system function, the system function used for repair or diagnosis of memory; and
subsequently disable the operating system after utilizing the system function.
19. The article of claim 11 , wherein the processing cores of the electronic device are caused to be shut down using an operating system service.
20. The article of claim 11 , wherein the processing is further caused to:
detect a memory modification during the scan of the memory of the electronic device;
enable a system resource, wherein the system resource is the one or more disabled processing cores, or the one or more disabled system interrupts, user interrupts, or scheduler timer interrupts;
in response to detection of a memory modification, repair the memory modification; and
disable the system resource after the memory modification is repaired.