Intel CPU Spectre ํŒจ์น˜(Retpoline) ์™€ ํ…Œ์ŠคํŠธ

์ง€๋‚œ Meltdown ์ทจ์•ฝ์  ํŒจ์น˜๋ฅผ ํ†ตํ•ด์„œ System Call ํ•จ์ˆ˜ ํ˜ธ์ถœ์‹œ 4๋ฐฐ์˜ ์„ฑ๋Šฅ์ด ํ•˜๋ฝ๋˜๋Š” ๊ฒƒ์„ ์•Œ ์ˆ˜ ์žˆ์—ˆ์Šต๋‹ˆ๋‹ค. ํ•˜์ง€๋งŒ ์ด ์ทจ์•ฝ์ ์€ Intel CPU์—์„œ๋งŒ ์กด์žฌํ•˜๋Š” ์ทจ์•ฝ์ ์ด๋ฉฐ Kernel Page Table Isolation (KPTI) ํŒจ์น˜๋ฅผ ํ†ตํ•ด ์ทจ์•ฝ์ ์„ ๊ณ ์น  ์ˆ˜ ์žˆ์—ˆ๊ณ , AMD ๋ฐ ARM ํ”„๋กœ์„ธ์„œ์—์„œ๋Š” ์˜ํ–ฅ์ด ์—†์—ˆ์Œ์„ ์•Œ ์ˆ˜ ์žˆ์—ˆ์Šต๋‹ˆ๋‹ค. Spectre ์ทจ์•ฝ์ ์€ ์ด์ „ ํฌ์ŠคํŠธ์—์„œ๋„ ์„ค๋ช…ํ•œ ์ ์ด ์žˆ์—ˆ์Šต๋‹ˆ๋‹ค. ๊ฐ„๋‹จํ•˜๊ฒŒ ๋‹ค์‹œ ํ•œ ๋ฒˆ ์„ค๋ช…๋“œ๋ฆฌ์ž๋ฉด, A ํ”„๋กœ๊ทธ๋žจ์ด B ํ”„๋กœ๊ทธ๋žจ์˜ ๋ฉ”๋ชจ๋ฆฌ ์ฃผ์†Œ๋ฅผ ์นจ๋ฒ”ํ•  ์ˆ˜ ์žˆ๋Š” ์ทจ์•ฝ์ ์œผ๋กœ, ํฌ๊ฒŒ๋Š” ๊ฐ€์ƒ ๋จธ์‹ ์˜ OS๊ฐ€ Host OS์˜ ์ฃผ์†Œ ๋ฒ”์œ„๊นŒ์ง€ ์นจ๋ฒ”ํ•  ์ˆ˜๋„ ์žˆ๋Š” ๋งค์šฐ ๋ฌด์„œ์šด ์ทจ์•ฝ์ ์ž…๋‹ˆ๋‹ค. ์ด ์ทจ์•ฝ์ ์€ Intel CPU ๋ฟ๋งŒ ์•„๋‹ˆ๋ผ, AMD, ARM CPU์—๋„ ์ทจ์•ฝ์ ์ด..