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The basic idea is to search existing code for places where speculation touches upon otherwise inaccessible data, manipulate the processor into a state where speculative execution has to contact that data, and then time the side effect of the processor being faster, if its by-now-prepared prefetch machinery indeed did load a cache line.
Speculative execution exploit Variant 4, [8] is referred to as Speculative Store Bypass (SSB), [1] [9] and has been assigned CVE-2018-3639. [7] SSB is named Variant 4, but it is the fifth variant in the Spectre-Meltdown class of vulnerabilities. [7] Steps involved in exploit: [1] "Slowly" store a value at a memory location
Speculative execution is an optimization technique where a computer system performs some task that may not be needed. Work is done before it is known whether it is actually needed, so as to prevent a delay that would have to be incurred by doing the work after it is known that it is needed.
In June 2021, two new vulnerabilities, Speculative Code Store Bypass (SCSB, CVE-2021-0086) and Floating Point Value Injection (FPVI, CVE-2021-0089), affecting all modern x86-64 CPUs both from Intel and AMD were discovered. [33]
These statements can often be misleading, as they can be mistaken for factual statements, while they are actually speculation. According to United States Code 15 Section 78u-5, a forward-looking statement may include future economic performance, such as revenues or income, plans for future operations, or use of a report written by an outside ...
Paul Volcker. The Volcker Rule is section 619 [1] of the Dodd–Frank Wall Street Reform and Consumer Protection Act (12 U.S.C. § 1851).The rule was originally proposed by American economist and former United States Federal Reserve Chairman Paul Volcker in 2010 to restrict United States banks from making certain kinds of speculative investments that do not benefit their customers. [2]
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BAU – Business as usual; BEP – Break-even point; BI – Business intelligence; BIC – Bank identifier code; bldg. – Building BLS – Balance sheet; BOM – Bill of materials; BPO – Business process outsourcing