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2018. 1. 22. 20:08

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..

2018. 1. 4. 17:32

Intel CPU ๋ณด์•ˆ ์ทจ์•ฝ์  ํŒจ์น˜๋กœ ์ธํ•œ ์„ฑ๋Šฅ ๊ฐ์†Œ์™€ 1์ฐจ ํ…Œ์ŠคํŠธ

์•ˆ๋…•ํ•˜์„ธ์š”. 2018๋…„ ์ฒซ ํฌ์ŠคํŒ…์ด๋„ค์š”. ๋ชจ๋‘๋“ค ์ƒˆํ•ด ๋ณต ๋งŽ์ด ๋ฐ›์œผ์‹œ๊ธฐ ๋ฐ”๋ž๋‹ˆ๋‹ค. ์ƒˆํ•ด๋ถ€ํ„ฐ ๋ญ”๊ฐ€ ํฐ ์ผ์ด ํ„ฐ์ง„ ๋“ฏํ•ฉ๋‹ˆ๋‹ค. ํ˜„์žฌ ์ธํ…”์˜ ๋ชจ๋“  ํ”„๋กœ์„ธ์„œ์—์„œ ์ปค๋„ ๋ฉ”๋ชจ๋ฆฌ ์ทจ์•ฝ์ ์ด ๋ฐœ๊ฒฌ๋˜์–ด ํ˜„์žฌ ๋ฆฌ๋ˆ…์Šค๋ฅผ ํฌํ•จํ•œ ์œˆ๋„ ์šด์˜์ฒด์ œ Redstone 3 ๋ฒ„์ „๋„ ํŒจ์น˜ ์กฐ์น˜๊ฐ€ ๋‚ด๋ ค์ง„ ์ƒํƒœ์ž…๋‹ˆ๋‹ค. ๊ทธ๋Ÿฐ๋ฐ, ํŒจ์น˜๋ฅผ ํ•œ ๋’ค์— ์„ฑ๋Šฅ์ด 30% ๊ฐ์†Œํ•œ๋‹ค๋Š” ์ด์•ผ๊ธฐ๊ฐ€ ์žˆ๋Š”๋ฐ์š”. ์–ด๋–ค ์ทจ์•ฝ์ ์ด๊ณ , ์™œ ์ด๋Ÿฐ ์ผ์ด ๋ฐœ์ƒํ•˜๋Š”์ง€ ์กฐ๊ธˆ ์•Œ์•„๋ณด๋„๋ก ํ•˜๊ฒ ์Šต๋‹ˆ๋‹ค. Meltdown, Spectre ์ด๋ฒˆ ์ทจ์•ฝ์ ์˜ ์ด๋ฆ„์€ ์œ„์™€ ๊ฐ™์€ ๋‘ ๊ฐœ ์ด๋ฆ„์˜ ์ทจ์•ฝ์ ์„ ๊ฐ€์ง€๊ณ  ์žˆ์Šต๋‹ˆ๋‹ค. ๋จผ์ € ์ด ์ทจ์•ฝ์ ์€ ๊ตฌ๊ธ€์˜ ๋ณด์•ˆ๊ธฐ์ˆ ํŒ€์ธ Project zero ํŒ€์— ์˜ํ•ด ๋ฐœ๊ฒฌ๋˜์—ˆ์Šต๋‹ˆ๋‹ค.. Meltdown ์ทจ์•ฝ์ ์€ Intel CPU์— ์ ์šฉ๋œ OoOE(๋น„์ˆœ์ฐจ์  ๋ช…๋ น์–ด ์ฒ˜๋ฆฌ) ๊ธฐ์ˆ ์˜ ๋ฒ„๊ทธ๋ฅผ ..