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The sandsifter audits x86 processors for hidden instructions and hardware bugs, by systematically generating machine code to search through a processor's instruction set, and monitoring execution for anomalies. Sandsifter has uncovered secret processor instructions from every major vendor; ubiquitous software bugs in disassemblers, assemblers, and emulators; flaws in enterprise hypervisors; and both benign and security-critical hardware bugs in x86 chips.
With the multitude of x86 processors in existence, the goal of the tool is to enable users to check their own systems for hidden instructions and bugs.
The computer is systematically scanned for anomalous instructions. In the upper half, you can view the instructions that the sandsifter is currently testing on the processor. In the bottom half, the sandsifter reports anomalies it finds.
The search will take from a few hours to a few days, depending on the speed of and complexity of your processor. When it is complete, summarize the results:
