{"id":248712,"date":"2022-08-02T09:00:40","date_gmt":"2022-08-02T01:00:40","guid":{"rendered":"https:\/\/lrxjmw.cn\/?p=248712"},"modified":"2022-07-26T23:54:22","modified_gmt":"2022-07-26T15:54:22","slug":"glibc-linux-arc4random","status":"publish","type":"post","link":"https:\/\/lrxjmw.cn\/glibc-linux-arc4random.html","title":{"rendered":"\u65f6\u969415 \u5e74,Glibc\u5f15\u5165Linux\u7684arc4random\u51fd\u6570"},"content":{"rendered":"<table>\n<tbody>\n<tr>\n<td style=\"padding: 5px 12px; width: 25px; font-size: 22px; text-align: center; background: #E8E8E8; line-height: 30px; color: #999;\">\u5bfc\u8bfb<\/td>\n<td style=\"padding: 10px 10px 12px; line-height: 20px;\"><strong>\u65f6\u9694 15 \u5e74\uff0cGlibc \u7ec8\u4e8e\u5f15\u5165\u4e86\u7528\u4e8e Linux \u7684 arc4random \u51fd\u6570,glibc\u662fGNU\u53d1\u5e03\u7684libc\u5e93\uff0c\u5373c\u8fd0\u884c\u5e93\u3002glibc\u662flinux\u7cfb\u7edf\u4e2d\u6700\u5e95\u5c42\u7684api\uff0c\u51e0\u4e4e\u5176\u5b83\u4efb\u4f55\u8fd0\u884c\u5e93\u90fd\u4f1a\u4f9d\u8d56\u4e8eglibc\u3002<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u8fd1\u65e5\u7684\u4e00\u4e2a\u63d0\u4ea4\u663e\u793a\uff0cGNU C \u5e93 (Glibc) \u7ec8\u4e8e\u6dfb\u52a0\u4e86\u7528\u4e8e Linux \u7684 arc4random \u51fd\u6570\u3002\u5728 BSD \u4e0a\uff0c arc4random\u3001arc4random_buf \u548c arc4random_uniform \u51fd\u6570\u5f88\u5e38\u89c1\uff0c\u5b83\u53ef\u4ee5\u63d0\u4f9b\u6bd4 rand\/random \u9ad8\u8d28\u91cf\u7684\u968f\u673a\u6570\u751f\u6210\u3002<br \/>\n\u53cd\u89c2 Glibc\uff0c\u65e9\u5728 2007 \u5e74\u5c31\u6709\u4eba\u5728 Bug 4417 \u4e2d\u8bf7\u6c42\u4f7f\u7528 Glibc \u7684 arc4random\uff0c\u5e76\u63d0\u4f9b\u4e86 \u5b9e\u73b0 arc4random \u7684\u521d\u6b65\u8865\u4e01\u3002\u4f46\u8be5 arc4random \u8865\u4e01\u5f97\u5230\u7684\u56de\u5e94\u5374\u662f \u201c glibc \u4e0d\u662f\u5565\u4ee3\u7801\u90fd\u53ef\u4ee5\u968f\u4fbf\u653e\u7684\u5783\u573e\u573a \u201d\u3002<br \/>\n<a><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-248714\" src=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2022\/07\/gilbc0.png\" alt=\"\" width=\"664\" height=\"432\" srcset=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2022\/07\/gilbc0.png 664w, https:\/\/lrxjmw.cn\/wp-content\/uploads\/2022\/07\/gilbc0-300x195.png 300w\" sizes=\"auto, (max-width: 664px) 100vw, 664px\" \/><\/a><\/p>\n<p>\u800c\u5728 2018 \u5e74\uff0c\u4e00\u4f4d\u7ea2\u5e3d\u5de5\u7a0b\u5e08\u518d\u5ea6\u4e3a Glibc \u5f00\u53d1 arc4random\u3002\u56db\u5e74\u540e\uff0cLinaro \u7684 Adhemerval Zanella Netto \u6210\u529f\u5730\u5c06 arc4random \u7cfb\u5217\u51fd\u6570\u901a\u8fc7\u7ec8\u70b9\u7ebf\u5e76\u8fdb\u5165\u4e86 Glibc \u7684\u4e3b\u7ebf\u3002<\/p>\n<p><a><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-248715\" src=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2022\/07\/gilbc01.png\" alt=\"\" width=\"706\" height=\"446\" srcset=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2022\/07\/gilbc01.png 706w, https:\/\/lrxjmw.cn\/wp-content\/uploads\/2022\/07\/gilbc01-300x190.png 300w\" sizes=\"auto, (max-width: 706px) 100vw, 706px\" \/><\/a><\/p>\n<p>arc4random \u7684\u4e3b\u8981\u4f18\u70b9\u662f\u968f\u673a\u6027\u7684\u5355\u4f4d\u4e0d\u662f\u7edf\u4e00\u968f\u673a\u53d8\u91cf\uff08uint32_t\uff09\uff0c\u800c\u662f\u4e00\u4e2a\u968f\u673a\u4f4d\u3002\u5b83\u6700\u521d\u4f7f\u7528 32 \u4f4d\u968f\u673a\u53d8\u91cf\uff0c\u7136\u540e\u9010\u5b57\u8282\u91c7\u6837\u6765\u4f18\u5316\u5185\u90e8\u7f13\u51b2\u533a\u91c7\u6837\u3002<\/p>\n<p>\u6839\u636e\u8bf7\u6c42\u7684\u4e0a\u9650\uff0c\u5b83\u53ef\u80fd\u4f1a\u5bfc\u81f4\u66f4\u597d\u7684 CPU \u5229\u7528\u7387\u3002<\/p>\n<p>\u800c\u636e\u5916\u5a92 Phoronix \u4ecb\u7ecd\uff0c\u9664\u4e86\u5c06 arc4random\u3001arc4random_buf \u548c arc4random_uniform \u51fd\u6570\u6dfb\u52a0\u5230\u6807\u51c6\u5e93\u4e4b\u5916\uff0c\u5468\u4e94\u7684\u8865\u4e01\u6d3b\u52a8\u8fd8\u4e3a AArch64\u3001x86 SSE2\u3001x86 AVX2\u3001PowerPC64 \u548c s390x \u6dfb\u52a0\u4e86\u4f18\u5316\u7684 ChaCha20 \u7248\u672c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8fd1\u65e5\u7684\u4e00\u4e2a\u63d0\u4ea4\u663e\u793a\uff0cGNU C \u5e93 (Glibc) \u7ec8\u4e8e\u6dfb\u52a0\u4e86\u7528\u4e8e Linux \u7684 arc4random \u51fd\u6570 [&hellip;]<\/p>\n","protected":false},"author":643,"featured_media":248718,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[21],"tags":[],"class_list":["post-248712","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"acf":[],"_links":{"self":[{"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/posts\/248712","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/users\/643"}],"replies":[{"embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/comments?post=248712"}],"version-history":[{"count":8,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/posts\/248712\/revisions"}],"predecessor-version":[{"id":248996,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/posts\/248712\/revisions\/248996"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/media\/248718"}],"wp:attachment":[{"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/media?parent=248712"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/categories?post=248712"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/tags?post=248712"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}