{"id":30860,"date":"2023-05-20T11:17:41","date_gmt":"2023-05-20T03:17:41","guid":{"rendered":"https:\/\/docs.pingcode.com\/?p=30860"},"modified":"2023-07-31T01:51:36","modified_gmt":"2023-07-30T17:51:36","slug":"%e4%bd%bf%e7%94%a8bpf-trace%e6%9d%a5trace%e4%bb%80%e4%b9%88%e8%bf%9b%e7%a8%8b%e5%9c%a8%e8%af%bb%e5%8f%96-etc-passw","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/30860.html","title":{"rendered":"\u4f7f\u7528bpf trace\u6765trace\u4ec0\u4e48\u8fdb\u7a0b\u5728\u8bfb\u53d6\/etc\/passw"},"content":{"rendered":"<blockquote class=\"wp-block-quote\">\n<p>\u4f7f\u7528bpf trace\u6765trace\u8ffd\u8e2a\/etc\/passwd\u7684\u8fdb\u7a0b\u4ece\u800c\u8bfb\u53d6\/etc\/passw\uff0c\u5177\u4f53\u6b65\u9aa4\u4e3a\uff1a1\u3001\u521b\u5efabpf trace\u811a\u672c\uff1b2\u3001\u89e3\u91ca\u811a\u672c\uff1b3\u3001\u6267\u884c\u811a\u672c\uff0c\u7b49\u5f85\u8f93\u51fa\u3002\u521b\u5efabpf trace\u811a\u672c\u662f\u6307\u521b\u5efa\u4e00\u4e2abpftrace\u811a\u672c\u4ee5\u4fbf\u8fdb\u884c\u540e\u7eed\u64cd\u4f5c\u3002<\/p>\n<\/blockquote>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img fetchpriority=\"high\" alt=\"\" class=\"wp-image-30861\" decoding=\"async\" height=\"576\" sizes=\"(max-width: 1024px) 100vw, 1024px\" src=\"https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2023\/05\/\u6570\u636e\u7ed3\u6784\u9002\u7528\u4e8e\u89e3\u51b3\u4ec0\u4e48\u95ee\u9898-25-1024x576.png?x-oss-process=image\/auto-orient,1\/format,webp\" srcset=\"https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2023\/05\/\u6570\u636e\u7ed3\u6784\u9002\u7528\u4e8e\u89e3\u51b3\u4ec0\u4e48\u95ee\u9898-25-1024x576.png?x-oss-process=image\/auto-orient,1\/format,webp 1024w, https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2023\/05\/\u6570\u636e\u7ed3\u6784\u9002\u7528\u4e8e\u89e3\u51b3\u4ec0\u4e48\u95ee\u9898-25-300x169.png 300w, https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2023\/05\/\u6570\u636e\u7ed3\u6784\u9002\u7528\u4e8e\u89e3\u51b3\u4ec0\u4e48\u95ee\u9898-25-768x432.png 768w, https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2023\/05\/\u6570\u636e\u7ed3\u6784\u9002\u7528\u4e8e\u89e3\u51b3\u4ec0\u4e48\u95ee\u9898-25-270x152.png 270w, https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2023\/05\/\u6570\u636e\u7ed3\u6784\u9002\u7528\u4e8e\u89e3\u51b3\u4ec0\u4e48\u95ee\u9898-25-1536x865.png 1536w, https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2023\/05\/\u6570\u636e\u7ed3\u6784\u9002\u7528\u4e8e\u89e3\u51b3\u4ec0\u4e48\u95ee\u9898-25.png 1993w\" width=\"1024\"\/><\/figure>\n<\/div>\n<h2 class=\"wp-block-heading\">\u4e00\u3001\u4f7f\u7528bpf trace\u6765trace\u4ec0\u4e48\u8fdb\u7a0b\u5728\u8bfb\u53d6\/etc\/passw<\/h2>\n<h3 class=\"wp-block-heading\">1\u3001\u521b\u5efabpf trace\u811a\u672c<\/h3>\n<p>\u9996\u5148\u521b\u5efa\u4e00\u4e2abpf trace\u811a\u672c\u4ee5\u4fbf\u8fdb\u884c\u540e\u7eed\u64cd\u4f5c\uff0c\u4e0b\u9762\u662f\u4ee3\u7801\u793a\u4f8b\uff1a<\/p>\n<pre class=\"wp-block-code\"><code>sudo bpftrace -e 'tracepoint:syscalls:sys_enter_openat \/arg1 == \"0x0\" &amp;&amp; strstr(arg2-&gt;filename, \"\/etc\/passwd\")\/{ printf(\"%d %s\\n\", pid, comm); }'<\/code><\/pre>\n<h3 class=\"wp-block-heading\">2\u3001\u89e3\u91ca\u811a\u672c<\/h3>\n<ul>\n<li>tracepoint:syscalls:sys_enter_openat\uff1a\u8868\u793a\u8ddf\u8e2a\u7cfb\u7edf\u8c03\u7528 openat \u7684\u5f00\u59cb\u6267\u884c\uff1b<\/li>\n<li>\/arg1 == \u201c0x0\u201d &amp;&amp; strstr(arg2-&gt;filename, \u201c\/etc\/passwd\u201d)\/\uff1a\u8868\u793a\u8fc7\u6ee4\u6761\u4ef6\uff0c\u53ea\u9700\u8981\u6355\u6349 filename \u4e3a \/etc\/passwd \u7684\u7cfb\u7edf\u8c03\u7528\uff1b<\/li>\n<li>{ printf(\u201c%d %s\\n\u201d, pid, comm); }\uff1a\u8868\u793a\u5f53\u6ee1\u8db3\u4e0a\u8ff0\u6761\u4ef6\u65f6\uff0c\u8f93\u51fa\u8be5\u8fdb\u7a0b\u7684pid\u548c\u8fdb\u7a0b\u540d\u3002<\/li>\n<\/ul>\n<h3 class=\"wp-block-heading\">3\u3001\u6267\u884c\u811a\u672c\uff0c\u7b49\u5f85\u8f93\u51fa<\/h3>\n<p>\u5f53\u6709\u8fdb\u7a0b\u8bfb\u53d6\/etc\/passwd\u6587\u4ef6\u65f6\uff0c\u547d\u4ee4\u884c\u4f1a\u8f93\u51fa\u8be5\u8fdb\u7a0b\u7684pid\u548c\u8fdb\u7a0b\u540d\uff0c\u53ef\u4ee5\u4ece\u8f93\u51fa\u4e2d\u627e\u5230\u76ee\u6807\u8fdb\u7a0b\u3002<\/p>\n<h2 class=\"wp-block-heading\">\u4e8c\u3001bpf trace\u4ecb\u7ecd<\/h2>\n<h3 class=\"wp-block-heading\">1\u3001\u7b80\u4ecb<\/h3>\n<p>\u5728v21.07 release\u53d1\u5e03\u7248\u672c\u4e2d\uff0cSPDK\u63d0\u4f9b\u4e86\u5bf9BPF\u8ffd\u8e2a\uff08tracing\uff09\u7684\u652f\u6301\u3002BPF\u8ffd\u8e2a\u6307\u4e00\u7ec4\u5b9a\u4e49\u5728 SPDK \u5e93\u7684\u811a\u672c\u548c\u9759\u6001\u63a2\u9488\uff0c\u4e3a\u7528\u6237\u63d0\u4f9b\u4e86\u68c0\u67e5 SPDK \u5e94\u7528\u7a0b\u5e8f\u7684\u53e6\u4e00\u79cd\u65b9\u6cd5\u3002SPDK\u5f88\u4e45\u4ee5\u524d\u5c31\u5efa\u7acb\u8fc7\u4e00\u4e2a\u540d\u4e3alibtrace\u7684\u8ffd\u8e2a\u5e93\u3002\u652f\u6301BPF\u8ffd\u8e2a\u5e76\u4e0d\u662f\u8981\u53d6\u4ee3libtrace\uff0c\u800c\u662f\u8981\u5bf9\u5b83\u8fdb\u884c\u8865\u5145\u3002\u8fd9\u4e24\u4e2a\u5e93\u7684\u529f\u80fd\u7565\u6709\u4e0d\u540c\uff1alibtrace\u7684\u5f00\u9500\u5f88\u4f4e\uff0c\u4f46\u7075\u6d3b\u6027\u8f83\u5dee\u3002BPF\u8ffd\u8e2a\u7684\u6210\u672c\u8f83\u9ad8\uff08\u8bf7\u6c42CPU\u6838trap\u9677\u9631\uff09\uff0c\u4f46\u529f\u80fd\u66f4\u5168\u9762\uff0c\u751a\u81f3\u53ef\u4ee5\u52a8\u6001\u94fe\u63a5\uff0c\u4e0d\u5fc5\u5728\u4ee3\u7801\u4e2d\u5b9a\u4e49\u63a2\u9488\u3002<\/p>\n<h3 class=\"wp-block-heading\">2\u3001\u7528\u6237\u6001\u8ffd\u8e2a<\/h3>\n<p>\u9996\u5148\uff0c\u6211\u4eec\u6765\u63a2\u8ba8\u4ec0\u4e48\u662fBPF\u8ffd\u8e2a\uff0c\u4ee5\u53caSPDK\u662f\u5982\u4f55\u5229\u7528\u5b83\u7684\u3002BPF\uff0c\u5373<strong>Berkeley Packet Filter<\/strong>\uff08\u4f2f\u514b\u5229\u5305\u8fc7\u6ee4\u5668\uff09\uff0c\u662f\u4e00\u9879\u6700\u521d\u4e3a\u5206\u6790\u548c\u8fc7\u6ee4\u7f51\u7edc\u6d41\u91cf\u800c\u5f00\u53d1\u7684\u6280\u672f\u3002\u7528\u6237\u53ef\u4ee5\u501f\u6b64\u5728\u4e13\u95e8\u7684BPF\u865a\u62df\u673a\u7684\u64cd\u4f5c\u7cfb\u7edf\u5185\u6838\u8fd0\u884c\u7528\u6237\u63d0\u4f9b\u7684\u7a0b\u5e8f\u3002\u968f\u540eBPF\u5728Linux\u4e2d\u5f97\u5230\u6269\u5c55\uff08\u6269\u5c55\u540e\u7684BPF\u7b80\u79f0\u4e3aeBPF\uff09\uff0c\u53ef\u652f\u6301\u66f4\u591a\u7528\u4f8b\uff0c\u5176\u4e2d\u4e5f\u5305\u62ec\u8ffd\u8e2a\u3002<\/p>\n<p>\u7528\u6237\u80fd\u591f\u5229\u7528Linux \u8ffd\u8e2a\u5b50\u7cfb\u7edf\u5728\u7a0b\u5e8f\u7684\u7279\u5b9a\u5730\u65b9\u9644\u52a0\u63a2\u9488\uff0c\u4e00\u65e6\u89e6\u53d1\u540e\u4f1a\u8fd0\u884c\u9644\u52a0\u5728\u8be5\u63a2\u9488\u7684eBPF\u7a0b\u5e8f\u3002\u5728\u7528\u6237\u6001\u5e94\u7528\u7a0b\u5e8f\u4e2d\uff0cBPF\u4f1a\u653e\u7f6e\u4e00\u6761\u6307\u4ee4\uff08x86\u7684int3\u6307\u4ee4\uff09\uff0c\u751f\u6210SIGTRAP\uff0c\u88abCPU\u6838\u6355\u83b7\u540e\uff0c\u5373\u89e6\u53d1\u6267\u884ceBPF\u7a0b\u5e8f\u3002<\/p>\n<p>SPDK\u4f7f\u7528BPF trace\uff08https:\/\/github.com\/iovisor\/bpftrace\uff09\u6765\u5b9a\u4e49\u548c\u9644\u52a0\u63a2\u9488\u3002BPF\u8ffd\u8e2a\u5de5\u5177\u4f7f\u7528\u9ad8\u7ea7\u811a\u672c\u8bed\u8a00\uff08\u4f5c\u8005\u79f0\u662fawk\u548cC\u8bed\u8a00\u7684\u7ed3\u5408\uff09\u6765\u63cf\u8ff0\u7279\u5b9a\u63a2\u9488\u88ab\u89e6\u53d1\u65f6\u7684\u64cd\u4f5c\u3002\u63a2\u9488\u53ef\u4ee5\u5206\u4e3a\u9759\u6001\u5b9a\u4e49\u548c\u52a8\u6001\u5b9a\u4e49\u4e24\u79cd\u3002<strong>\u9759\u6001\u63a2\u9488<\/strong>\u4e5f\u79f0\u4e3aUSDT\uff08User Statically-Defined Tracing\u7528\u6237\u9759\u6001\u5b9a\u4e49\u7684\u63a2\u9488\uff09\uff0c\u7531\u7a0b\u5e8f\u5458\u653e\u7f6e\u5728\u4ee3\u7801\u7684\u5404\u4e2a\u5173\u952e\u4f4d\u7f6e\uff08\u4f7f\u7528\u4e00\u79cdSPDK_DTRACE_PROBE*\u5b8f\uff09\u3002<strong>\u52a8\u6001\u63a2\u9488<\/strong>\u53ef\u4ee5\u5728<strong>\u4efb\u4f55<\/strong>\u51fd\u6570\u5f00\u59cb\u65f6\u542f\u7528\uff0c\u4e0d\u9700\u8981\u66f4\u6539\u4ee3\u7801\u6216\u91cd\u65b0\u7f16\u8bd1\u5e94\u7528\u7a0b\u5e8f\u3002\u4f46\u6709\u4e00\u70b9\u9700\u8981\u6ce8\u610f\uff1a\u4e00\u4e9b\u9759\u6001\u51fd\u6570\u8c03\u7528\u53ef\u80fd\u4f1a\u4f7f\u7f16\u8bd1\u5668\u4ea7\u751finline\uff0c\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u4e0d\u4f1a\u7167\u5e38\u6267\u884c\u63a2\u9488\u8ffd\u8e2a\u3002<\/p>\n<h3 class=\"wp-block-heading\">3\u3001\u8ffd\u8e2a\u5de5\u5177<\/h3>\n<p>\u4e3a\u4e86\u7f16\u8bd1\u9759\u6001\u63a2\u9488\uff0cSPDK\u5fc5\u987b\u914d\u7f6e\u2013with-usdt\u3002\u6211\u4eec\u5728Ubuntu 20.04\u548cFedora 33\u7684\u6570\u636e\u5305\u7248\u672c\u8ffd\u8e2a\u65f6\u90fd\u9047\u5230\u4e86\u4e00\u4e9b\u95ee\u9898\uff0c\u56e0\u6b64\u5efa\u8bae\u4ece\u6e90\u7801\u6784\u5efa\u6700\u65b0\u7248\u672c\u7684bpftrace\u3002\u53ef\u4ee5\u4f7f\u7528scripts\/bpftrace.sh\u6765\u9644\u52a0\u548c\u663e\u793a\u8ffd\u8e2a\u3002\u8fd0\u884cscripts\/bpftrace.sh\u9700\u8981\u4e24\u4e2a\u53c2\u6570\uff1a\u652f\u6301\u8ffd\u8e2a\u7684\u8fdb\u7a0b\u53c2\u6570PID\u548c\u652f\u6301\u9644\u52a0\u7684bpftrace\u811a\u672c\u3002\u8fd9\u4e9b\u811a\u672c\u80fd\u591f\u6536\u96c6\u548c\u663e\u793a\u5404\u79cd\u4e0d\u540c\u7684\u4fe1\u606f\u548c\u7edf\u8ba1\u6570\u636e\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u8f93\u51fa\u67d0\u4e2a\u51fd\u6570\u6bcf\u6b21\u88ab\u8c03\u7528\u65f6\u7684\u53c2\u6570\uff0c\u8ba1\u7b97\u67d0\u4e2a\u4ee3\u7801\u8def\u5f84\u88ab\u6267\u884c\u7684\u6b21\u6570\uff0c\u751a\u81f3\u53ef\u4ee5\u521b\u5efa\u5e76\u663e\u793a\u4e00\u7ec4\u6570\u636e\u7684\u76f4\u65b9\u56fe\u3002SPDK \u63d0\u4f9b\u4e86\u51e0\u4e2a\u53ef\u7528\u811a\u672c\uff0c\u4f4d\u4e8e scripts\/bpf \u76ee\u5f55\u3002<\/p>\n<p>\u63a5\u4e0b\u6765\u6211\u4eec\u6765\u8ba8\u8bbascripts\/bpf\/send_msg.bt\u811a\u672c\uff0c\u5e94\u8be5\u5982\u4f55\u7528\u5b83\u6765\u68c0\u67e5SPDK\u5e94\u7528\u7a0b\u5e8f\u5462\uff1f\u8be5\u811a\u672c\u901a\u8fc7spdk_thread_send_msg()\u548cspdk_for_each_channel()\u8ba1\u7b97\u67d0\u51fd\u6570\u7684\u6267\u884c\u6b21\u6570\u3002\u811a\u672c\u7684\u5185\u5bb9\u7b80\u5355\u660e\u4e86\uff1a<\/p>\n<pre class=\"wp-block-code\"><code>uprobe:__EXE__:spdk_thread_send_msg {\n\n                       @send_msg[usym(arg1)] = count();\n}\n\nuprobe:__EXE__:spdk_for_each_channel {\n                      @for_each_channel[usym(arg1)] = count();\n}<\/code><\/pre>\n<p>scripts\/bpf\/send_msg.bt\u811a\u672c\u901a\u8fc7uprobe\u5173\u952e\u5b57\u5b9a\u4e49\u4e86\u4e24\u4e2a\u52a8\u6001\u63a2\u9488\uff0c\u5206\u522b\u4e3asend_msg\u548cfor_each_channel\uff0c\u5c06\u6bcf\u4e2a\u51fd\u6570\u7684\u8c03\u7528\u6b21\u6570\u5b58\u5728\u6620\u5c04\u3002\u540d\u5217\u524d\u8305\u4e2a\u53c2\u6570arg1\u662f\u6620\u5c04\u7684\u5bc6\u94a5\u4e4b\u4e00\uff0c\u5728\u8fd9\u4e24\u79cd\u63a2\u9488\u4e0barg1\u6307\u7684\u90fd\u662f\u5f85\u6267\u884c\u51fd\u6570\u7684\u6307\u9488\u3002\u8be5\u811a\u672c\u4f7f\u7528\u4e86\u4e24\u4e2a\u8f85\u52a9\u51fd\u6570\uff1ausym()\u51fd\u6570\u8d1f\u8d23\u8fd4\u56de\u7ed9\u5b9a\u5730\u5740\u7684\u7b26\u53f7\u540d\u79f0\uff0ccount()\u51fd\u6570\u8d1f\u8d23\u8ba1\u7b97\u67d0\u4e2a\u51fd\u6570\u88ab\u8c03\u7528\u7684\u6b21\u6570\u3002<\/p>\n<p>\u8fd8\u6709\u4e00\u4e2a\u7279\u6b8a\u53d8\u91cf\u662fSPDK \u7279\u6709\u7684__EXE__\u3002 scripts\/bpftrace.sh 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