{"id":617,"date":"2022-12-15T09:56:53","date_gmt":"2022-12-15T01:56:53","guid":{"rendered":"https:\/\/julyclyde.org\/?p=617"},"modified":"2022-12-15T09:56:53","modified_gmt":"2022-12-15T01:56:53","slug":"%e6%98%a8%e5%a4%a9%e9%81%87%e5%88%b0collectd-exec%e6%8f%92%e4%bb%b6%e7%9a%84bug%ef%bc%8c%e9%a1%ba%e4%be%bf%e5%8f%91%e7%8e%b0%e4%bb%96%e4%bb%ac%e4%b8%8d%e6%8c%89%e5%a5%97%e8%b7%af%e5%87%ba%e7%89%8c","status":"publish","type":"post","link":"https:\/\/julyclyde.org\/?p=617","title":{"rendered":"\u6628\u5929\u9047\u5230collectd exec\u63d2\u4ef6\u7684bug\uff0c\u987a\u4fbf\u53d1\u73b0\u4ed6\u4eec\u4e0d\u6309\u5957\u8def\u51fa\u724c\u554a"},"content":{"rendered":"\n<p>\u5148\u8bf4\u75c7\u72b6\uff1a<\/p>\n\n\n\n<p>collectd exec\u63d2\u4ef6\u8c03\u7528\u7684\u51e0\u4e2a\u5916\u90e8\u811a\u672c\uff0c\u5176\u4e2d\u603b\u4f1a\u968f\u673a\u6709\u4e00\u4e2a\u7f3a\u5c11COLLECTD_HOSTNAME\u548cCOLLECTD_INTERVAL\u73af\u5883\u53d8\u91cf\u3002<\/p>\n\n\n\n<p>\u641c\u4e86\u4e00\u4e0b\u662f\u8fd9\u4e2abug https:\/\/github.com\/collectd\/collectd\/issues\/3041<\/p>\n\n\n\n<p>\u7136\u540e\u6211\u597d\u5947\u554a\uff0c\u5c31\u8bfb\u4e86\u4e00\u4e0b\u4fee\u6539\u524d\u540e\u7684\u4ee3\u7801\uff0c\u53d1\u73b0collectd\u4e0d\u6309\u5957\u8def\u51fa\u724c\u3002<\/p>\n\n\n\n<p>\u5e26\u6709bug\u7684\u7248\u672c\uff1a<\/p>\n\n\n\n<p>\u5148setenv()\u8bbe\u7f6e\u4e3b\u8fdb\u7a0b\u81ea\u5df1\u7684\u73af\u5883\u53d8\u91cf\uff0c\u7136\u540e\u5c1d\u8bd5fork()\uff0c\u5982\u679c\u6210\u529f\uff0c\u5728\u5b50\u8fdb\u7a0b\u91ccexecvp()\uff1b\u4e3b\u8fdb\u7a0b\u91cd\u65b0unsetenv()\u6062\u590d\u4e3b\u8fdb\u7a0b\u81ea\u5df1\u7684\u73af\u5883\u53d8\u91cf\u3002\u5728\u591a\u4e2aexec\u5bc6\u96c6\u6267\u884c\u7684\u65f6\u5019\uff0c\u90fd\u4f1a\u8bbf\u95ee\u4e3b\u8fdb\u7a0b\u7684\u73af\u5883\u53d8\u91cf\uff0c\u4f1a\u6709race 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**environ\u6307\u9488\u6307\u5411\u51c6\u5907\u597d\u7684\u6570\u7ec4\uff0c\u7136\u540eexecvp()\u6267\u884c\u65b0\u8fdb\u7a0b\u76f4\u63a5\u7ee7\u627f\u3002<\/p>\n\n\n\n<p>\u522b\u4eba\u5bb6\u5957\u8def\uff1a<\/p>\n\n\n\n<p>\u5148\u51c6\u5907\u73af\u5883\u53d8\u91cf\u6570\u7ec4\uff0c\u7136\u540efork()\uff0c\u5728\u5b50\u8fdb\u7a0b\u91ccexecve()\u5e76\u4f7f\u7528\u524d\u8ff0\u73af\u5883\u53d8\u91cf\u6570\u7ec4\u4f5c\u4e3a\u53c2\u6570\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5148\u8bf4\u75c7\u72b6\uff1a collectd exec\u63d2\u4ef6\u8c03\u7528\u7684\u51e0\u4e2a\u5916\u90e8\u811a\u672c\uff0c\u5176\u4e2d\u603b\u4f1a\u968f\u673a\u6709\u4e00\u4e2a\u7f3a\u5c11COLLECTD_HOSTNAME\u548cCOLLECTD_INTERVAL\u73af\u5883\u53d8\u91cf\u3002 \u641c\u4e86\u4e00\u4e0b\u662f\u8fd9\u4e2abug https:\/\/github.com\/collectd\/collectd\/issues\/3041 \u7136\u540e\u6211\u597d\u5947\u554a\uff0c\u5c31\u8bfb\u4e86\u4e00\u4e0b\u4fee\u6539\u524d\u540e\u7684\u4ee3\u7801\uff0c\u53d1\u73b0collectd\u4e0d\u6309\u5957\u8def\u51fa\u724c\u3002 \u5e26\u6709bug\u7684\u7248\u672c\uff1a \u5148setenv()\u8bbe\u7f6e\u4e3b\u8fdb\u7a0b\u81ea\u5df1\u7684\u73af\u5883\u53d8\u91cf\uff0c\u7136\u540e\u5c1d\u8bd5fork()\uff0c\u5982\u679c\u6210\u529f\uff0c\u5728\u5b50\u8fdb\u7a0b\u91ccexecvp()\uff1b\u4e3b\u8fdb\u7a0b\u91cd\u65b0unsetenv()\u6062\u590d\u4e3b\u8fdb\u7a0b\u81ea\u5df1\u7684\u73af\u5883\u53d8\u91cf\u3002\u5728\u591a\u4e2aexec\u5bc6\u96c6\u6267\u884c\u7684\u65f6\u5019\uff0c\u90fd\u4f1a\u8bbf\u95ee\u4e3b\u8fdb\u7a0b\u7684\u73af\u5883\u53d8\u91cf\uff0c\u4f1a\u6709race condition\uff0c\u5076\u5c14\u4f1a\u53d1\u751f\u524d\u4e00\u4e2aexec\u63d2\u4ef6\u521aunsetenv()\u7136\u540e\u540e\u4e00\u4e2aexec\u63d2\u4ef6\u5f00\u59cbfork()\u7684\u60c5\u51b5\uff0c\u4e22\u5931\u73af\u5883\u53d8\u91cf\u3002 \u4fee\u590d\u540e\u7684\u7248\u672c\uff1a 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