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RISC-V business: 'GhostWrite' chip flaw detailed at Black Hat USA
- moritzruth 2y agoThis article reads like they intentionally left out any details. > The researchers estimate that disabling the specific extensions needed to block an attack could result in the loss of as much as 50% of the chip’s instruction set […] Which extensions?
- johndoe0815 2y agoThe T-Head specific vector instruction set extension which exposes the bug.
- fweimer 2y agoThe technical details have been published: https://ghostwriteattack.com/riscvuzz.pdf https://ghostwriteattack.com/riscvuzz.pdf ; t0 = physical address, a0 = byte to be written vsetvli zero, zero, e8, m1 vmv.v.x v0, a0 ; encoded: 0x10028027 vse128.v v0, 0(t0) So it's really quite bad for those CPUs.