{"id":31839,"date":"2023-07-26T10:25:32","date_gmt":"2023-07-26T02:25:32","guid":{"rendered":"https:\/\/www.juejinka.com\/?p=31839"},"modified":"2023-07-26T10:25:34","modified_gmt":"2023-07-26T02:25:34","slug":"amd%e4%bf%ae%e8%a1%a5%e5%8f%af%e9%80%a0%e6%88%90zen-2-cpu%e6%95%b0%e6%8d%ae%e5%a4%96%e6%b3%84%e7%9a%84zenbleed%e6%bc%8f%e6%b4%9e","status":"publish","type":"post","link":"https:\/\/www.juejinka.com\/y\/31839.html","title":{"rendered":"AMD\u4fee\u8865\u53ef\u9020\u6210Zen 2 CPU\u6570\u636e\u5916\u6cc4\u7684Zenbleed\u6f0f\u6d1e"},"content":{"rendered":"\n

AMD\u6628\u65e5\u53d1\u51fa\u5b89\u5168\u516c\u544a\uff0c\u4ee5\u4fee\u8865\u53ef\u8ba9\u653b\u51fb\u8005\u4ece\u6570\u6b3eRyzon\u53caEPYC\u5904\u7406\u5668\u53d6\u5f97\u5bc6\u7801\u3001\u5bc6\u94a5\u7b49\u673a\u5bc6\u8d44\u8baf\u7684Zenbleed\u6f0f\u6d1e\u3002<\/p>\n\n\n\n

\u8fd9\u9879\u6f0f\u6d1e\u6b63\u5f0f\u7f16\u53f7\u4e3aCVE-2023-20593\uff0c\u662f\u5f71\u54cdAMD Zen 2 CPU\u7684\u4f7f\u7528\u5df2\u91ca\u653e\u5185\u5b58\uff08use-after-free\uff09\u7c7b\u578b\u7455\u75b5\u3002 \u5b83\u662f\u77e5\u540d\u8c37\u6b4c\u5b89\u5168\u7814\u7a76\u4eba\u5458Tavis Ormandy\u53d1\u73b0\u4e0e\u901a\u62a5\u3002<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

\u8fd9\u9879\u6f0f\u6d1e\u51fa\u5728AMD CPU\u5728\u73b0\u4ee3\u5904\u7406\u5668\u8fdb\u884c\u63a8\u6d4b\u6267\u884c\uff08speculative execution\uff09\u8fc7\u7a0b\u4e2d\uff0c\u5904\u7406vzeroupper\u6307\u4ee4\u4e0d\u5f53\uff0c\u800c\u7ed9\u653b\u51fb\u8005\u5f15\u53d1\u4fe1\u606f\u6cc4\u9732\u7684\u673a\u4f1a\u3002 \u6b63\u5e38\u7684\u5904\u7406\u5668\u6267\u884cvzeroupper\u65f6\uff0c\u82e5\u53d1\u73b0\u5176\u63a8\u6d4b\u9519\u8bef\uff0c\u4f1a\u5c06YMM\u6682\u5b58\u5668\u7f6e\u96f6\uff0c\u4ee5\u4fbf\u628a\u6682\u5b58\u5668\u7528\u4f5c\u5176\u4ed6\u8fd0\u7b97\u4e4b\u7528\u3002 Ormandy\u89e3\u91ca\uff0c\u56e0\u4e3aAMD\u7684\u8fd9\u4e2aBug\uff0c\u653b\u51fb\u8005\u5728\u7cbe\u51c6\u8c03\u5ea6\u4e0b\uff0c\u4f7f\u7528\u67d0\u4e9b\u7a0b\u5e8f\u5f15\u53d1\u53ef\u9020\u6210\u6307\u4ee4\u65e0\u6cd5\u6b63\u786e\u5c06\u5bc4\u5b58\u5668\u7f6e\u96f6\uff0c\u4e5f\u5c31\u662f\u5f53\u4e2d\u8fd8\u7559\u6709\u6570\u636e\uff0c\u4ee5\u81f4\u4e8e\u88ab\u540e\u6765\u5176\u4ed6\u4f7f\u7528YMM\u6682\u5b58\u5668\u7684\u5e94\u7528\u7a0b\u5e8f\u8bbf\u95ee\uff0c\u53ef\u80fd\u9020\u6210\u654f\u611f\u4fe1\u606f\u5916\u6cc4\u3002 Ormandy\u5c06\u4e4b\u79f0\u4e3aZenbleed\u3002<\/p>\n\n\n\n

\u8c37\u6b4c\u7814\u7a76\u4eba\u5458\u53d1\u73b0\uff0c\u53d7\u5230\u8fd9\u6f0f\u6d1e\u5f71\u54cd\u7684AMD\u4ea7\u54c1\u5305\u62ecRyzen 3000\u3001Threadripper 3000\u30014000\u3001PRO 4000\u30015000\u30017020\u5904\u7406\u5668\u53caEPYC Rome\u5904\u7406\u5668\u7b498\u9879\u4ea7\u54c1\uff0c\u904d\u53ca\u884c\u52a8\u88c5\u7f6e\u3001\u684c\u673a\u3001\u5de5\u4f5c\u7ad9\u53ca\u670d\u52a1\u5668\u4ea7\u54c1\u3002<\/p>\n\n\n\n

AMD\u5c06\u8fd9\u9879\u6f0f\u6d1e\u98ce\u9669\u503c\u5217\u4e3a\u4e2d\u5ea6\uff0c\u5e76\u5df2\u91ca\u51fa\u03bccode\u4fee\u8865\u7a0b\u5e8f\uff08EPYC 7002\u5904\u7406\u5668\u9002\u7528\uff09\u53ca\u5305\u542b\u66f4\u65b0\u7248AGESA\u56fa\u4ef6\u7684BIOS\u66f4\u65b0\uff0c\u547c\u5401\u7528\u6237\u5c3d\u901f\u5b89\u88c5\uff0cAMD\u4e5f\u8ba1\u5212\u5c06\u65b0\u7248\u56fa\u4ef6\u63d0\u4f9b\u7ed9OEM\u3002<\/p>\n\n\n\n

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