3 ms·
dupe: https://news.ycombinator.com/item?id=40591280 https://news.ycombinator.com/item?id=40591280 This is a bug in a student-built microarchitecture, not an is
by snvzz 2y ago
dupe: https://news.ycombinator.com/item?id=40591280 https://news.ycombinator.com/item?id=40591280
This is a bug in a student-built microarchitecture, not an issue with the ISA.
Not a great article, as it attacks RISC-V for no good reason.
- Taniwha 2y agoYeah looks like bugs in riscv-boom rather than the RISC-V ISA itself
- Taniwha 2y agoIn particular this is a timing attack like Spectre/Meltdown - looks like there are timing issues with allocation of write port slots when writing to the register file - because division takes so long it's possible to use a late write from division to tell whether a particular speculative branch has been taken or not
- longerd2 2y agoThey had a pun, they wanted to use it.