{"id":2049,"date":"2017-06-15T01:38:43","date_gmt":"2017-06-15T01:38:43","guid":{"rendered":"https:\/\/www.inforsec.org\/wp\/?p=2049"},"modified":"2017-06-15T01:38:43","modified_gmt":"2017-06-15T01:38:43","slug":"%e9%92%88%e5%af%b9linux%e5%86%85%e6%a0%b8%e4%b8%addouble-fetch%e6%bc%8f%e6%b4%9e%e7%9a%84%e7%a0%94%e7%a9%b6","status":"publish","type":"post","link":"http:\/\/202.112.238.40\/wp\/?p=2049","title":{"rendered":"\u9488\u5bf9Linux\u5185\u6838\u4e2ddouble fetch\u6f0f\u6d1e\u7684\u7814\u7a76"},"content":{"rendered":"<p style=\"text-align: center;\"><strong><b>\u9488\u5bf9Linux\u5185\u6838\u4e2ddouble fetch\u6f0f\u6d1e\u7684\u7814\u7a76<\/b><\/strong><\/p>\n<p>\u4f5c\u8005\uff1a\u738b\u9e4f\u98de \u56fd\u9632\u79d1\u6280\u5927\u5b66\u8ba1\u7b97\u673a\u5b66\u9662\u7f51\u7edc\u5b89\u5168\u5b9e\u9a8c\u5ba4<\/p>\n<p>\u8fd1\u5e74\u6765\uff0c\u5e76\u884c\u7a0b\u5e8f\u968f\u7740\u591a\u6838CPU\u786c\u4ef6\u7684\u666e\u53ca\u800c\u88ab\u8d8a\u6765\u8d8a\u5e7f\u6cdb\u7684\u4f7f\u7528\uff0c\u7279\u522b\u662f\u5728\u64cd\u4f5c\u7cfb\u7edf\u3001\u5b9e\u65f6\u7cfb\u7edf\u3001\u4ee5\u53ca\u8ba1\u7b97\u5bc6\u96c6\u578b\u7cfb\u7edf\u4e2d\uff0c\u5e76\u884c\u7a0b\u5e8f\u6781\u5927\u5730\u53d1\u6325\u4e86\u5e76\u53d1\u5904\u7406\u7684\u4f18\u52bf\u3002\u7136\u800c\u5e76\u884c\u7a0b\u5e8f\u4e2d\u5b58\u5728\u7684\u5e76\u53d1\u9519\u8bef\uff08concurrency bug\uff09\u56e0\u4e3a\u7ebf\u7a0b\u8c03\u5ea6\u5f15\u5165\u4e86\u4e0d\u786e\u5b9a\u6027\u800c\u5448\u73b0\u96be\u68c0\u6d4b\u3001\u96be\u590d\u73b0\u3001\u96be\u4fee\u590d\u7684\u7279\u70b9\u3002\u6570\u636e\u7ade\u4e89\uff08data race\uff09\u662f\u5e76\u884c\u7a0b\u5e8f\u4e2d\u666e\u904d\u5b58\u5728\u7684\u60c5\u51b5\uff0c\u5f53\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u8bbf\u95ee\u67d0\u4e00\u5171\u4eab\u5185\u5b58\u5730\u5740\u4e14\u5176\u4e2d\u81f3\u5c11\u4e00\u4e2a\u662f\u5199\u64cd\u4f5c\uff0c\u800c\u8fd9\u4e9b\u8bbf\u95ee\u64cd\u4f5c\u5728\u6ca1\u6709\u5fc5\u8981\u7684\u540c\u6b65\u63aa\u65bd\u4fdd\u62a4\u65f6\u5c31\u4f1a\u5f15\u53d1\u6570\u636e\u7ade\u4e89\u3002\u6570\u636e\u7ade\u4e89\u6781\u6613\u5f15\u53d1\u5e76\u53d1\u9519\u8bef\uff0c\u5305\u62ec\u6b7b\u9501\uff08deadlock\uff09\uff0c\u539f\u5b50\u6027\u8fdd\u4f8b\uff08atomicity violation\uff09\uff0c\u987a\u5e8f\u8fdd\u4f8b\uff08order violation\uff09\u7b49\u3002\u5f53\u5e76\u53d1\u9519\u8bef\u53ef\u4ee5\u88ab\u653b\u51fb\u8005\u5229\u7528\u65f6\uff0c\u5c31\u5f62\u6210\u4e86\u5e76\u53d1\u6f0f\u6d1e\u3002\u5386\u53f2\u4e0a\u7531\u7ade\u4e89\u5f15\u53d1\u7684\u5e76\u53d1\u9519\u8bef\u66fe\u591a\u6b21\u9020\u6210\u91cd\u5927\u5b89\u5168\u4e8b\u6545\uff0c\u5982\u8457\u540d\u7684Therac-25\u533b\u7597\u4e8b\u6545\u66fe\u9020\u6210\u591a\u4eba\u6b7b\u4f24\uff0c2003\u5e74\u7684\u5317\u7f8e\u5927\u505c\u7535\u66fe\u9020\u6210\u6570\u5341\u4ebf\u7f8e\u5143\u7684\u7ecf\u6d4e\u635f\u5931\u7b49\u3002<\/p>\n<p><!--more--><\/p>\n<p><a href=\"https:\/\/www.inforsec.org\/wp\/wp-content\/uploads\/2017\/06\/\u56fe\u72471-1.png\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2050 aligncenter\" src=\"https:\/\/www.inforsec.org\/wp\/wp-content\/uploads\/2017\/06\/\u56fe\u72471-1.png\" alt=\"\" width=\"611\" height=\"202\" srcset=\"http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2017\/06\/\u56fe\u72471-1.png 611w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2017\/06\/\u56fe\u72471-1-300x99.png 300w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2017\/06\/\u56fe\u72471-1-250x83.png 250w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2017\/06\/\u56fe\u72471-1-150x50.png 150w\" sizes=\"auto, (max-width: 611px) 100vw, 611px\" \/><\/a><\/p>\n<p style=\"text-align: center;\">\u56fe1 Double Fetch\u539f\u7406<\/p>\n<p>\u7cfb\u7edf\u4e2d\u7684\u7ade\u4e89\u4e0d\u53ea\u4f1a\u53d1\u751f\u5728\u7ebf\u7a0b\u95f4\uff0c\u8fd8\u53ef\u80fd\u53d1\u751f\u5728\u5185\u6838\u4e0e\u7528\u6237\u7ebf\u7a0b\u95f4\uff0cSerna[1]\u5c06\u8fd9\u4e00\u7279\u6b8a\u7684\u7ade\u4e89\u79f0\u4e4b\u4e3adouble fetch\u3002\u5982\u56fe1\u6240\u793a\uff0c\u7528\u6237\u901a\u5e38\u4f1a\u901a\u8fc7\u8c03\u7528\u5185\u6838\u51fd\u6570\u5b8c\u6210\u7279\u5b9a\u529f\u80fd\uff0c\u5f53\u5185\u6838\u51fd\u6570\u4e24\u6b21\u4ece\u540c\u4e00\u7528\u6237\u5185\u5b58\u5730\u5740\u8bfb\u53d6\u540c\u4e00\u6570\u636e\u65f6\uff0c\u901a\u5e38\u7b2c\u4e00\u6b21\u8bfb\u53d6\u7528\u6765\u9a8c\u8bc1\u6570\u636e\u6216\u5efa\u7acb\u8054\u7cfb\uff0c\u7b2c\u4e8c\u6b21\u5219\u7528\u6765\u4f7f\u7528\u8be5\u6570\u636e\u3002\u4e0e\u6b64\u540c\u65f6\uff0c\u7528\u6237\u7a7a\u95f4\u5e76\u53d1\u8fd0\u884c\u7684\u6076\u610f\u7ebf\u7a0b\u53ef\u4ee5\u5728\u4e24\u6b21\u5185\u6838\u8bfb\u53d6\u64cd\u4f5c\u4e4b\u95f4\uff0c\u5229\u7528\u7ade\u4e89\u6761\u4ef6\u5bf9\u8be5\u6570\u636e\u8fdb\u884c\u7be1\u6539\uff0c\u4ece\u800c\u9020\u6210\u5185\u6838\u4f7f\u7528\u6570\u636e\u7684\u4e0d\u4e00\u81f4\u3002Double fetch\u6f0f\u6d1e\u53ef\u9020\u6210\u5305\u62ec\u7f13\u51b2\u533a\u6ea2\u51fa\u3001\u4fe1\u606f\u6cc4\u9732\u3001\u7a7a\u6307\u9488\u5f15\u7528\u7b49\u540e\u679c\uff0c\u6700\u7ec8\u9020\u6210\u5185\u6838\u5d29\u6e83\u6216\u8005\u6076\u610f\u63d0\u6743\u3002<\/p>\n<p><a href=\"https:\/\/www.inforsec.org\/wp\/wp-content\/uploads\/2017\/06\/\u56fe\u72472-1.png\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-2051 aligncenter\" src=\"https:\/\/www.inforsec.org\/wp\/wp-content\/uploads\/2017\/06\/\u56fe\u72472-1.png\" alt=\"\" width=\"599\" height=\"355\" \/><\/a><\/p>\n<p style=\"text-align: center;\">\u56fe2 \u65b9\u6cd5\u6846\u67b6<\/p>\n<p>\u9488\u5bf9Linux\u5185\u6838\u4e2d\u7684double fetch\u95ee\u9898\uff0c\u6211\u4eec\u57fa\u4e8eCoccinelle\u5f15\u64ce\uff0c\u63d0\u51fa\u4e86\u4e00\u79cd\u9759\u6001\u6a21\u5f0f\u5339\u914d\u7684\u68c0\u6d4b\u65b9\u6cd5\uff0c\u8be5\u65b9\u6cd5\u80fd\u591f\u68c0\u6d4b\u5b8c\u6574\u5185\u6838\uff08\u5305\u62ec\u6240\u6709\u9a71\u52a8\u7a0b\u5e8f\uff09\u4ee3\u7801\u800c\u4e0d\u5fc5\u4f9d\u8d56\u7279\u5b9a\u786c\u4ef6\u3002\u5982\u56fe2\u6240\u793a\uff0c\u6211\u4eec\u7684\u65b9\u6cd5\u5206\u4e24\u4e2a\u9636\u6bb5\uff0c\u9996\u5148\u6839\u636edouble fetch\u5b9a\u4e49\u4ece\u6e90\u4ee3\u7801\u4e2d\u8fdb\u884c\u6a21\u7cca\u5339\u914d\uff0c\u5373\u5339\u914d\u591a\u6b21\u8c03\u7528copy_from_user()\u6216get_user()\u7b49\u62f7\u8d1d\u51fd\u6570\u4ece\u7528\u6237\u540c\u4e00\u5730\u5740\u8bfb\u53d6\u6570\u636e\u7684\u5185\u6838\u51fd\u6570\u3002\u7136\u540e\u4eba\u5de5\u5206\u6790\u8fd9\u4e9b\u5339\u914d\u5230\u7684\u51fd\u6570\uff0c\u57fa\u4e8e\u6b64\uff0c\u6211\u4eec\u603b\u7ed3\u4e86\u7528\u6237\u6570\u636e\u662f\u5982\u4f55\u4f20\u9012\u5230\u5185\u6838\u4e2d\u7684\u4ee5\u53ca\u5728\u5185\u6838\u4e2d\u662f\u5982\u4f55\u88ab\u4f7f\u7528\u7684\uff0c\u5e76\u4e14\u5f52\u7eb3\u4e863\u4e2a\u5bb9\u6613\u9020\u6210double fetch\u7684\u5178\u578b\u4f7f\u7528\u573a\u666f\uff1asize checking, type selection, shallow copy\u3002\u6b64\u5916\u6211\u4eec\u8fd8\u6536\u96c6\u4e86double fetch\u95ee\u9898\u5728\u4ee3\u7801\u5b9e\u73b0\u5c42\u9762\u7684\u7ec6\u8282\u3002\u5728\u7b2c\u4e8c\u9636\u6bb5\u4e2d\uff0c\u57fa\u4e8e\u4e0a\u4e00\u6b65\u4e2d\u6536\u96c6\u5230\u7684double fetch\u7279\u5f81\u548c\u7ec6\u8282\uff0c\u6211\u4eec\u8fdb\u884c\u7cbe\u51c6\u6a21\u5f0f\u5339\u914d\u7684double fetch\u68c0\u6d4b\u3002\u6211\u4eec\u5c06\u6240\u63d0\u65b9\u6cd5\u5e94\u7528\u5230Linux\uff0cAndroid\uff0cFreeBSD\u540e\uff0c\u5171\u53d1\u6398\u672a\u77e5double fetch\u6f0f\u6d1e6\u4e2a\uff0c\u5982\u88681\u6240\u793a\u3002<\/p>\n<p style=\"text-align: center;\">\u88681 \u53d1\u6398\u7684double fetch\u6f0f\u6d1e<\/p>\n<p><a href=\"https:\/\/www.inforsec.org\/wp\/wp-content\/uploads\/2017\/06\/\u56fe\u72473-1.png\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2052 aligncenter\" src=\"https:\/\/www.inforsec.org\/wp\/wp-content\/uploads\/2017\/06\/\u56fe\u72473-1.png\" alt=\"\" width=\"630\" height=\"451\" srcset=\"http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2017\/06\/\u56fe\u72473-1.png 630w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2017\/06\/\u56fe\u72473-1-300x215.png 300w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2017\/06\/\u56fe\u72473-1-210x150.png 210w, http:\/\/202.112.238.40\/wp\/wp-content\/uploads\/2017\/06\/\u56fe\u72473-1-150x107.png 150w\" sizes=\"auto, (max-width: 630px) 100vw, 630px\" \/><\/a><\/p>\n<p><a href=\"https:\/\/www.inforsec.org\/wp\/wp-content\/uploads\/2017\/06\/\u56fe\u72474.png\"><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-2053 aligncenter\" src=\"https:\/\/www.inforsec.org\/wp\/wp-content\/uploads\/2017\/06\/\u56fe\u72474.png\" alt=\"\" width=\"507\" height=\"574\" \/><\/a><\/p>\n<p style=\"text-align: center;\">\u56fe3 CVE-2016-6480<\/p>\n<p>\u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u7b80\u8981\u4ecb\u7ecd\u4e00\u4e2a\u5c5e\u4e8esize checking\u573a\u666f\u7684double fetch\u6f0f\u6d1e\uff08CVE-2016-6480\uff09\u3002\u8be5\u6f0f\u6d1e\u4f4d\u4e8eLinux 4.5\u4e2dAdaptec RAID\u63a7\u5236\u5668\u9a71\u52a8\u6587\u4ef6commctrl.c\u4e2d\u3002\u5982\u56fe3\u6240\u793a\uff0c\u51fd\u6570ioctl_send_fib() \u4e24\u6b21\u901a\u8fc7copy_from_user()\u62f7\u8d1d\u6307\u9488arg\u6307\u5411\u7684\u7528\u6237\u7a7a\u95f4\u6570\u636e\uff08\u5206\u522b\u4e3a81\u548c116\u884c\uff09\u3002\u7b2c\u4e00\u6b21\u53ea\u62f7\u8d1d\u4e86\u6d88\u606f\u5934\uff0c\u5e76\u7528\u6d88\u606f\u5934\u4e2d\u7684\u6570\u636e\u6765\u8ba1\u7b97\u7f13\u51b2\u533a\u5927\u5c0f\uff08\u7b2c90\u884c\uff09\uff0c\u68c0\u67e5\u6570\u636e\u7684\u6709\u6548\u6027\uff08\u7b2c93\u884c\uff09\uff0c\u5e76\u6839\u636e\u8ba1\u7b97\u7ed3\u679c\u6765\u5206\u914d\u76f8\u5e94\u7684\u7f13\u51b2\u533a\uff08\u7b2c101\u884c\uff09\u3002\u7b2c\u4e8c\u6b21\u62f7\u8d1d\uff08\u7b2c116\u884c\uff09\u5219\u6839\u636e\u7b2c\u4e00\u6b21\u83b7\u53d6\u7684\u6d88\u606f\u957f\u5ea6\u5c06\u5b8c\u6574\u6d88\u606f\u62f7\u8d1d\u8fdb\u5206\u914d\u597d\u7684\u7f13\u51b2\u533a\u4e2d\u3002\u6ce8\u610f\u6b64\u65f6\u6307\u5411\u5185\u6838\u7f13\u51b2\u533a\u7684\u6307\u9488\u53d8\u91cfkifb\u88ab\u518d\u4e00\u6b21\u4f7f\u7528\u4e86\uff08\u7b2c101\u884c\uff09\u3002\u5728\u7b2c\u4e8c\u6b21\u62f7\u8d1d\u4e4b\u540e\uff0c\u65b0\u62f7\u8d1d\u7684\u6d88\u606f\u5934\u4e2d\u7684\u8bb8\u591a\u53d8\u91cf\u88ab\u518d\u6b21\u4f7f\u7528\uff08\u800c\u5b83\u4eec\u53ef\u80fd\u5df2\u7ecf\u88ab\u7be1\u6539\uff09\uff0c\u4f8b\u5982\u7b2c121\u548c129\u884c\u7684kfib-&gt;header.Command\u3002\u5c24\u5176\u662f\u6d88\u606f\u5934\u4e2d\u7684\u957f\u5ea6\u53d8\u91cf\u4e5f\u88ab\u518d\u4e00\u6b21\u4f7f\u7528\uff08\u7b2c130\u884c\uff09\uff0c\u4ece\u800c\u5f15\u53d1\u4e86\u4e00\u4e2adouble fetch\u6f0f\u6d1e\uff0c\u56e0\u4e3a\u6076\u610f\u7528\u6237\u7ebf\u7a0b\u53ef\u80fd\u5728\u4e24\u6b21\u62f7\u8d1d\u4e4b\u95f4\u7be1\u6539\u6d88\u606f\u5934\u4e2d\u7684\u957f\u5ea6\u53d8\u91cfkfib-&gt;header.size\uff0c\u4f7f\u5f97\u7b2c\u4e8c\u6b21\u8bfb\u53d6\u5e76\u4f7f\u7528\u7684\u503c\u8fdc\u5927\u4e8e\u7b2c\u4e00\u6b21\u5206\u914d\u7684\u7f13\u51b2\u533a\u5927\u5c0f\uff0c\u4ece\u800c\u9020\u6210buffer over-access\u3002<\/p>\n<p>\u7ed3\u5408\u4ee5\u4e0a\u7814\u7a76\uff0c\u6211\u4eec\u8fd8\u63d0\u51fa\u4e865\u6761\u9488\u5bf9double fetch\u95ee\u9898\u7684\u9884\u9632\u7b56\u7565\uff0c\u5e76\u57fa\u4e8e\u5176\u4e2d\u4e00\u6761\u5b9e\u73b0\u4e86\u4e00\u4e2a\u5de5\u5177\u81ea\u52a8\u4e3a\u5df2\u53d1\u73b0\u7684double fetch\u6f0f\u6d1e\u6253\u8865\u4e01\u3002\u9664\u6b64\u4e4b\u5916\uff0c\u6211\u4eec\u8fd8\u6709\u5982\u4e0b\u6709\u8da3\u53d1\u73b0\uff1a<\/p>\n<ul>\n<li>Double fetch\u662f\u4e2a\u666e\u904d\u6027\u7684\u95ee\u9898\uff0cWindows\uff0cLinux\uff0cAndroid\uff0cFreeBSD\u7b49\u64cd\u4f5c\u7cfb\u7edf\u90fd\u5b58\u5728\u6b64\u7c7b\u95ee\u9898\uff0c\u6709\u7684\u6f0f\u6d1e\u5df2\u7ecf\u5b58\u572810\u5e74\u4ee5\u4e0a\uff08CVE-2016-6480\uff09\u3002<\/li>\n<li>\u5927\u90e8\u5206double fetch\u60c5\u51b5\u5e76\u4e0d\u4f1a\u9020\u6210double fetch\u6f0f\u6d1e\uff0c\u56e0\u4e3a\u4e24\u6b21\u8bfb\u53d6\u7684\u6570\u636e\u4e0d\u4e00\u5b9a\u4f1a\u88ab\u4ea4\u53c9\u4f7f\u7528\u3002\u4f46\u662f\u826f\u6027\u7684double fetch\u60c5\u51b5\u5bb9\u6613\u5728\u4ee3\u7801\u66f4\u65b0\u65f6\u7531\u4e8e\u4ea4\u53c9\u4f7f\u7528\u4e24\u6b21\u8bfb\u53d6\u7684\u6570\u636e\u800c\u8f6c\u5316\u6210\u6709\u5bb3\u7684\u6f0f\u6d1e\uff08CVE-2016-5728\uff09\u3002<\/li>\n<li>\u5185\u6838\u4e2d\u6709\u4e9b\u6570\u636e\u4f7f\u7528\u60c5\u51b5\u4f1a\u4e0d\u53ef\u907f\u514d\u7684\u5f15\u53d1double fetch\uff0c\u6211\u4eec\u5f52\u7eb3\u4e863\u4e2a\u4e3b\u8981\u573a\u666f\uff1asize checking, type selection, shallow copy\uff0c\u5e76\u63d0\u51fa\u4e86\u9884\u9632\u7b56\u7565\u3002<\/li>\n<li>\u5927\u90e8\u5206\u7684double fetch\u5b58\u5728\u4e8e\u9a71\u52a8\u7a0b\u5e8f\u4e2d\uff0863%\uff09\u3002<\/li>\n<li>Size checking\u573a\u666f\u6700\u5bb9\u6613\u5f15\u53d1double fetch\u6f0f\u6d1e\u3002<\/li>\n<\/ul>\n<p>\u76ee\u524d\u6240\u53d1\u6398\u6f0f\u6d1e\u5df2\u5f97\u5230Linux\u5185\u6838\u5f00\u53d1\u56e2\u961f\u7684\u786e\u8ba4\u3001\u4fee\u590d\u5e76\u96c6\u6210\u5230\u4e3b\u5e72\u5206\u652f\u3002\u6240\u63d0\u68c0\u6d4b\u65b9\u6cd5\u53ca\u53d1\u73b0\u5df2\u7ecf\u88abCoccinelle\u56e2\u961f\u548cLinux\u5185\u6838\u5f00\u53d1\u56e2\u961f\u91c7\u7528\u5e76\u96c6\u6210\u5230\u5185\u6838\u8865\u4e01\u5ba1\u8ba1\u4e2d\u3002\u76f8\u5173\u8bba\u6587\u201cHow Double-Fetch Situations turn into Double-Fetch Vulnerabilities: A Study of Double Fetches in the Linux Kernel\u201d\u5df2\u53d1\u8868\u5728\u7cfb\u7edf\u5b89\u5168\u9886\u57df\u8457\u540d\u4f1a\u8baeUSENIX Security 2017\uff0c\u8be6\u7ec6\u4fe1\u606f\u8bf7\u53c2\u9605\u8bba\u6587\u3002<\/p>\n<p><strong>\u53c2\u8003\u6587\u732e\uff1a<\/strong><\/p>\n<p>1.Serna, F. J. MS08-061: the case of the kernel mode doublefetch,2008. <a href=\"https:\/\/blogs.technet.microsoft.com\/srd\/2008\/10\/14\/ms08-061-the-case-of-the-kernel-mode-double-fetch\/\"><u>https:\/\/blogs.technet.microsoft.com\/srd\/2008\/10\/14\/ms08-061-the-case-of-the-kernel-mode-double-fetch\/<\/u><\/a>.<\/p>\n<p><strong><b>\u4f5c\u8005\u7b80\u4ecb\uff1a<\/b><\/strong><\/p>\n<p>\u738b\u9e4f\u98de\uff0c\u535a\u58eb\u751f\uff0c\u56fd\u9632\u79d1\u5b66\u6280\u672f\u5927\u5b66\u8ba1\u7b97\u673a\u5b66\u9662\u7f51\u7edc\u5b89\u5168\u5b9e\u9a8c\u5ba4\uff0c\u5bfc\u5e08\u5362\u51ef\u7814\u7a76\u5458\u3002\u7814\u7a76\u9886\u57df\u4e3a\u7cfb\u7edf\u5b89\u5168\uff0c\u5e76\u884c\u7a0b\u5e8f\u5206\u6790\u7b49\u30022015-2016\u5e74\u5728\u82f1\u56fd\u4f26\u6566\u5927\u5b66\u5b66\u9662CREST\u7814\u7a76\u4e2d\u5fc3\u8bbf\u5b66\uff0c\u4e0eJens Krinke\u5408\u4f5c\u7814\u7a76double fetch\u95ee\u9898\uff0c\u64b0\u5199\u8bba\u6587\u201cHow Double-Fetch Situations turn into Double-Fetch Vulnerabilities: A Study of Double Fetches in the Linux Kernel\u201d\u53d1\u8868\u5728\u7cfb\u7edf\u5b89\u5168\u9886\u57df\u8457\u540d\u4f1a\u8baeUSENIX Security 2017\u3002<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u9488\u5bf9Linux\u5185\u6838\u4e2ddouble fetch\u6f0f\u6d1e\u7684\u7814\u7a76 \u4f5c\u8005\uff1a\u738b\u9e4f\u98de \u56fd\u9632\u79d1\u6280\u5927\u5b66\u8ba1\u7b97\u673a\u5b66\u9662\u7f51\u7edc\u5b89\u5168&#8230; <a class=\"continue-reading-link\" href=\"http:\/\/202.112.238.40\/wp\/?p=2049\"> Continue reading <span class=\"meta-nav\">&rarr; <\/span><\/a><\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-2049","post","type-post","status-publish","format-standard","hentry","category-research"],"_links":{"self":[{"href":"http:\/\/202.112.238.40\/wp\/index.php?rest_route=\/wp\/v2\/posts\/2049","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/202.112.238.40\/wp\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/202.112.238.40\/wp\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/202.112.238.40\/wp\/index.php?rest_route=\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"http:\/\/202.112.238.40\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2049"}],"version-history":[{"count":2,"href":"http:\/\/202.112.238.40\/wp\/index.php?rest_route=\/wp\/v2\/posts\/2049\/revisions"}],"predecessor-version":[{"id":2055,"href":"http:\/\/202.112.238.40\/wp\/index.php?rest_route=\/wp\/v2\/posts\/2049\/revisions\/2055"}],"wp:attachment":[{"href":"http:\/\/202.112.238.40\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2049"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/202.112.238.40\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2049"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/202.112.238.40\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2049"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}