{"id":8062,"date":"2023-12-12T15:39:17","date_gmt":"2023-12-12T07:39:17","guid":{"rendered":"https:\/\/yanjingang.com\/blog\/?p=8062"},"modified":"2023-12-13T20:54:33","modified_gmt":"2023-12-13T12:54:33","slug":"ebpf-%e4%bd%bf%e7%94%a8-kprobe-%e7%9b%91%e6%b5%8b%e6%8d%95%e8%8e%b7%e7%b3%bb%e7%bb%9f%e8%b0%83%e7%94%a8","status":"publish","type":"post","link":"https:\/\/yanjingang.com\/blog\/?p=8062","title":{"rendered":"eBPF\u2014\u4f7f\u7528kprobe\u63a2\u6d4b\u5185\u6838\u7cfb\u7edf\u8c03\u7528"},"content":{"rendered":"

\u5728\u524d\u4e24\u7bc7\u6587\u7ae0\u4e2d\uff0c\u6211\u4eec\u4e86\u89e3\u4e86eBPF\u7684\u57fa\u672c\u77e5\u8bc6\u3002\u672c\u6587\u5f00\u59cb\u8fdb\u884c\u4e00\u6b21\u5177\u4f53\u7684\u5b9e\u8df5\uff0c\u5e26\u5927\u5bb6\u901a\u8fc7kprobe\u5b9e\u73b0\u4e00\u4e2a\u7b80\u5355\u7684\u5185\u6838\u7cfb\u7edf\u8c03\u7528\u6355\u83b7\uff0c\u6765\u4e86\u89e3\u5982\u4f55\u5728\u5185\u6838\u51fd\u6570\u7684\u51fa\u5165\u53e3\u52a8\u6001\u6ce8\u5165\u81ea\u5b9a\u4e49\u4ee3\u7801\u3002<\/p>\n

\u4e00\u3001\u6982\u8ff0<\/h1>\n

\"\"<\/a><\/p>\n

1. \u4ec0\u4e48\u662fkprobe?<\/h4>\n

\u5f00\u53d1\u4eba\u5458\u5728\u5185\u6838\u6216\u8005\u6a21\u5757\u7684\u8c03\u8bd5\u8fc7\u7a0b\u4e2d\uff0c\u5f80\u5f80\u4f1a\u9700\u8981\u8981\u77e5\u9053\u5176\u4e2d\u7684\u4e00\u4e9b\u51fd\u6570\u6709\u65e0\u88ab\u8c03\u7528\u3001\u4f55\u65f6\u88ab\u8c03\u7528\u3001\u6267\u884c\u662f\u5426\u6b63\u786e\u4ee5\u53ca\u51fd\u6570\u7684\u5165\u53c2\u548c\u8fd4\u56de\u503c\u662f\u4ec0\u4e48\u7b49\u7b49\u3002\u6bd4\u8f83\u7b80\u5355\u7684\u505a\u6cd5\u662f\u5728\u5185\u6838\u4ee3\u7801\u5bf9\u5e94\u7684\u51fd\u6570\u4e2d\u6dfb\u52a0\u65e5\u5fd7\u6253\u5370\u4fe1\u606f\uff0c\u4f46\u8fd9\u79cd\u65b9\u5f0f\u5f80\u5f80\u9700\u8981\u91cd\u65b0\u7f16\u8bd1\u5185\u6838\u6216\u6a21\u5757\uff0c\u91cd\u65b0\u542f\u52a8\u8bbe\u5907\u4e4b\u7c7b\u7684\uff0c\u64cd\u4f5c\u8f83\u4e3a\u590d\u6742\u751a\u81f3\u53ef\u80fd\u4f1a\u7834\u574f\u539f\u6709\u7684\u4ee3\u7801\u6267\u884c\u8fc7\u7a0b\u3002<\/p>\n

\u800c\u5229\u7528 kprobes \u6280\u672f\uff0c\u7528\u6237\u53ef\u4ee5\u5b9a\u4e49\u81ea\u5df1\u7684\u56de\u8c03\u51fd\u6570\uff0c\u7136\u540e\u5728\u5185\u6838\u6216\u8005\u6a21\u5757\u4e2d\u51e0\u4e4e\u6240\u6709\u7684\u51fd\u6570\u4e2d<\/span>\uff08\u6709\u4e9b\u51fd\u6570\u662f\u4e0d\u53ef\u63a2\u6d4b\u7684\uff0c\u4f8b\u5982kprobes\u81ea\u8eab\u7684\u76f8\u5173\u5b9e\u73b0\u51fd\u6570\uff0c\u540e\u6587\u4f1a\u6709\u8be6\u7ec6\u8bf4\u660e\uff09\u52a8\u6001\u5730\u63d2\u5165\u63a2\u6d4b\u70b9\uff0c\u5f53\u5185\u6838\u6267\u884c\u6d41\u7a0b\u6267\u884c\u5230\u6307\u5b9a\u7684\u63a2\u6d4b\u51fd\u6570\u65f6\uff0c\u4f1a\u8c03\u7528\u8be5\u56de\u8c03\u51fd\u6570<\/span><\/span>\uff0c\u7528\u6237\u5373\u53ef\u6536\u96c6\u6240\u9700\u7684\u4fe1\u606f\u4e86\uff0c\u540c\u65f6\u5185\u6838\u6700\u540e\u8fd8\u4f1a\u56de\u5230\u539f\u672c\u7684\u6b63\u5e38\u6267\u884c\u6d41\u7a0b<\/span>\u3002\u5982\u679c\u7528\u6237\u5df2\u7ecf\u6536\u96c6\u8db3\u591f\u7684\u4fe1\u606f\uff0c\u4e0d\u518d\u9700\u8981\u7ee7\u7eed\u63a2\u6d4b\uff0c\u5219\u540c\u6837\u53ef\u4ee5\u52a8\u6001\u5730\u79fb\u9664\u63a2\u6d4b\u70b9<\/span>\u3002\u56e0\u6b64 kprobes \u6280\u672f\u5177\u6709\u5bf9\u5185\u6838\u6267\u884c\u6d41\u7a0b\u5f71\u54cd\u5c0f\u548c\u64cd\u4f5c\u65b9\u4fbf\u7684\u4f18\u70b9\u3002<\/p>\n

kprobes \u6280\u672f\u5305\u62ec\u76843\u79cd\u63a2\u6d4b\u624b\u6bb5\u5206\u522b\u65f6 kprobe\u3001jprobe \u548c kretprobe\u3002\u9996\u5148 kprobe \u662f\u6700\u57fa\u672c\u7684\u63a2\u6d4b\u65b9\u5f0f\uff0c\u662f\u5b9e\u73b0\u540e\u4e24\u79cd\u7684\u57fa\u7840\uff0c\u5b83\u53ef\u4ee5\u5728\u4efb\u610f\u7684\u4f4d\u7f6e\u653e\u7f6e\u63a2\u6d4b\u70b9\uff08\u5c31\u8fde\u51fd\u6570\u5185\u90e8\u7684\u67d0\u6761\u6307\u4ee4\u5904\u4e5f\u53ef\u4ee5\uff09\uff0c\u5b83\u63d0\u4f9b\u4e86\u63a2\u6d4b\u70b9\u7684\u8c03\u7528\u524d\u3001\u8c03\u7528\u540e\u548c\u5185\u5b58\u8bbf\u95ee\u51fa\u95193\u79cd\u56de\u8c03\u65b9\u5f0f\uff0c\u5206\u522b\u662f pre_handler\u3001post_handler \u548c fault_handler\uff0c\u5176\u4e2d pre_handler \u51fd\u6570\u5c06\u5728\u88ab\u63a2\u6d4b\u6307\u4ee4\u88ab\u6267\u884c\u524d\u56de\u8c03\uff0cpost_handler \u4f1a\u5728\u88ab\u63a2\u6d4b\u6307\u4ee4\u6267\u884c\u5b8c\u6bd5\u540e\u56de\u8c03\uff08\u6ce8\u610f\u4e0d\u662f\u88ab\u63a2\u6d4b\u51fd\u6570\uff09\uff0cfault_handler \u4f1a\u5728\u5185\u5b58\u8bbf\u95ee\u51fa\u9519\u65f6\u88ab\u8c03\u7528\uff1bjprobe \u57fa\u4e8e kprobe \u5b9e\u73b0\uff0c\u5b83\u7528\u4e8e\u83b7\u53d6\u88ab\u63a2\u6d4b\u51fd\u6570\u7684\u5165\u53c2\u503c<\/span>\uff1b\u6700\u540e kretprobe \u4ece\u540d\u5b57\u4e2d\u5c31\u53ef\u4ee5\u770b\u51fa\u5176\u7528\u9014\u4e86\uff0c\u5b83\u540c\u6837\u57fa\u4e8e kprobe \u5b9e\u73b0\uff0c\u7528\u4e8e\u83b7\u53d6\u88ab\u63a2\u6d4b\u51fd\u6570\u7684\u8fd4\u56de\u503c<\/span>\u3002<\/p>\n

kprobes \u7684\u6280\u672f\u539f\u7406\u5e76\u4e0d\u4ec5\u4ec5\u5305\u542b\u7eaf\u8f6f\u4ef6\u7684\u5b9e\u73b0\u65b9\u6848\uff0c\u5b83\u4e5f\u9700\u8981\u786c\u4ef6\u67b6\u6784\u63d0\u4f9b\u652f\u6301\u3002\u5176\u4e2d\u6d89\u53ca\u786c\u4ef6\u67b6\u6784\u76f8\u5173\u7684\u662f CPU \u7684\u5f02\u5e38\u5904\u7406\u548c\u5355\u6b65\u8c03\u8bd5\u6280\u672f\uff0c\u524d\u8005\u7528\u4e8e\u8ba9\u7a0b\u5e8f\u7684\u6267\u884c\u6d41\u7a0b\u9677\u5165\u5230\u7528\u6237\u6ce8\u518c\u7684\u56de\u8c03\u51fd\u6570\u4e2d\u53bb\uff0c\u800c\u540e\u8005\u5219\u7528\u4e8e\u5355\u6b65\u6267\u884c\u88ab\u63a2\u6d4b\u70b9\u6307\u4ee4\uff0c\u56e0\u6b64\u5e76\u4e0d\u662f\u6240\u6709\u7684\u67b6\u6784\u5747\u652f\u6301 kprobes\u3002\u76ee\u524d kprobes \u6280\u672f\u5df2\u7ecf\u652f\u6301\u591a\u79cd\u67b6\u6784\uff0c\u5305\u62ec i386\u3001x86_64\u3001ppc64\u3001ia64\u3001sparc64\u3001arm\u3001ppc \u548c mips\uff08\u6709\u4e9b\u67b6\u6784\u5b9e\u73b0\u53ef\u80fd\u5e76\u4e0d\u5b8c\u5168\uff0c\u5177\u4f53\u53ef\u53c2\u8003\u5185\u6838\u7684 Documentation\/kprobes.txt\uff09\u3002<\/p>\n

kprobes \u7684\u7279\u70b9\u4e0e\u4f7f\u7528\u9650\u5236\uff1a<\/p>\n

    \n
  1. kprobes \u5141\u8bb8\u5728\u540c\u4e00\u4e2a\u88ab\u63a2\u6d4b\u4f4d\u7f6e\u6ce8\u518c\u591a\u4e2a kprobe\uff0c\u4f46\u662f\u76ee\u524d jprobe \u5374\u4e0d\u53ef\u4ee5\uff1b\u540c\u65f6\u4e5f\u4e0d\u5141\u8bb8\u4ee5\u5176\u4ed6\u7684 jprobe \u56de\u8c03\u51fd\u6570\u548c kprobe \u7684 post_handler \u56de\u8c03\u51fd\u6570\u4f5c\u4e3a\u88ab\u63a2\u6d4b\u70b9\u3002<\/li>\n
  2. \u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u63a2\u6d4b\u5185\u6838\u4e2d\u7684\u4efb\u4f55\u51fd\u6570\uff0c\u5305\u62ec\u4e2d\u65ad\u5904\u7406\u51fd\u6570\u3002\u4e0d\u8fc7\u5728 kernel\/kprobes.c \u548c arch\/*\/kernel\/kprobes.c \u7a0b\u5e8f\u4e2d\u7528\u4e8e\u5b9e\u73b0 kprobes \u81ea\u8eab\u7684\u51fd\u6570\u662f\u4e0d\u5141\u8bb8\u88ab\u63a2\u6d4b\u7684\uff0c\u53e6\u5916\u8fd8\u6709do_page_fault \u548c notifier_call_chain\uff1b<\/li>\n
  3. \u5982\u679c\u4ee5\u4e00\u4e2a\u5185\u8054\u51fd\u6570\u4e3a\u63a2\u6d4b\u70b9\uff0c\u5219 kprobes \u53ef\u80fd\u65e0\u6cd5\u4fdd\u8bc1\u5bf9\u8be5\u51fd\u6570\u7684\u6240\u6709\u5b9e\u4f8b\u90fd\u6ce8\u518c\u63a2\u6d4b\u70b9\u3002\u7531\u4e8e gcc \u53ef\u80fd\u4f1a\u81ea\u52a8\u5c06\u67d0\u4e9b\u51fd\u6570\u4f18\u5316\u4e3a\u5185\u8054\u51fd\u6570\uff0c\u56e0\u6b64\u53ef\u80fd\u65e0\u6cd5\u8fbe\u5230\u7528\u6237\u9884\u671f\u7684\u63a2\u6d4b\u6548\u679c\uff1b<\/li>\n
  4. \u4e00\u4e2a\u63a2\u6d4b\u70b9\u7684\u56de\u8c03\u51fd\u6570\u53ef\u80fd\u4f1a\u4fee\u6539\u88ab\u63a2\u6d4b\u51fd\u6570\u7684\u8fd0\u884c\u4e0a\u4e0b\u6587\uff0c\u4f8b\u5982\u901a\u8fc7\u4fee\u6539\u5185\u6838\u7684\u6570\u636e\u7ed3\u6784\u6216\u8005\u4fdd\u5b58\u4e0estruct pt_regs\u7ed3\u6784\u4f53\u4e2d\u7684\u89e6\u53d1\u63a2\u6d4b\u5668\u4e4b\u524d\u5bc4\u5b58\u5668\u4fe1\u606f\u3002\u56e0\u6b64 kprobes \u53ef\u4ee5\u88ab\u7528\u6765\u5b89\u88c5 bug \u4fee\u590d\u4ee3\u7801\u6216\u8005\u6ce8\u5165\u6545\u969c\u6d4b\u8bd5\u4ee3\u7801\uff1b<\/li>\n
  5. kprobes \u4f1a\u907f\u514d\u5728\u5904\u7406\u63a2\u6d4b\u70b9\u51fd\u6570\u65f6\u518d\u6b21\u8c03\u7528\u53e6\u4e00\u4e2a\u63a2\u6d4b\u70b9\u7684\u56de\u8c03\u51fd\u6570\uff0c\u4f8b\u5982\u5728printk()\u51fd\u6570\u4e0a\u6ce8\u518c\u4e86\u63a2\u6d4b\u70b9\uff0c\u800c\u5728\u5b83\u7684\u56de\u8c03\u51fd\u6570\u4e2d\u53ef\u80fd\u4f1a\u518d\u6b21\u8c03\u7528printk\u51fd\u6570\uff0c\u6b64\u65f6\u5c06\u4e0d\u518d\u89e6\u53d1printk\u63a2\u6d4b\u70b9\u7684\u56de\u8c03\uff0c\u4ec5\u4ec5\u662f\u589e\u52a0\u4e86kprobe\u7ed3\u6784\u4f53\u4e2dnmissed\u5b57\u6bb5\u7684\u6570\u503c\uff1b<\/li>\n
  6. \u5728 kprobes \u7684\u6ce8\u518c\u548c\u6ce8\u9500\u8fc7\u7a0b\u4e2d\u4e0d\u4f1a\u4f7f\u7528 mutex \u9501\u548c\u52a8\u6001\u7684\u7533\u8bf7\u5185\u5b58\uff1b<\/li>\n
  7. kprobes \u56de\u8c03\u51fd\u6570\u7684\u8fd0\u884c\u671f\u95f4\u662f\u5173\u95ed\u5185\u6838\u62a2\u5360\u7684\uff0c\u540c\u65f6\u4e5f\u53ef\u80fd\u5728\u5173\u95ed\u4e2d\u65ad\u7684\u60c5\u51b5\u4e0b\u6267\u884c\uff0c\u5177\u4f53\u8981\u89c6CPU\u67b6\u6784\u800c\u5b9a\u3002\u56e0\u6b64\u4e0d\u8bba\u5728\u4f55\u79cd\u60c5\u51b5\u4e0b\uff0c\u5728\u56de\u8c03\u51fd\u6570\u4e2d\u4e0d\u8981\u8c03\u7528\u4f1a\u653e\u5f03 CPU \u7684\u51fd\u6570\uff08\u5982\u4fe1\u53f7\u91cf\u3001mutex \u9501\u7b49\uff09\uff1b<\/li>\n
  8. kretprobe \u901a\u8fc7\u66ff\u6362\u8fd4\u56de\u5730\u5740\u4e3a\u9884\u5b9a\u4e49\u7684 trampoline \u7684\u5730\u5740\u6765\u5b9e\u73b0\uff0c\u56e0\u6b64\u6808\u56de\u6eaf\u548c gcc \u5185\u5d4c\u51fd\u6570__builtin_return_address()\u8c03\u7528\u5c06\u8fd4\u56de trampoline \u7684\u5730\u5740\u800c\u4e0d\u662f\u771f\u6b63\u7684\u88ab\u63a2\u6d4b\u51fd\u6570\u7684\u8fd4\u56de\u5730\u5740\uff1b<\/li>\n
  9. \u5982\u679c\u4e00\u4e2a\u51fd\u6570\u7684\u8c03\u7528\u6b21\u6570\u548c\u8fd4\u56de\u6b21\u6570\u4e0d\u76f8\u7b49\uff0c\u5219\u5728\u7c7b\u4f3c\u8fd9\u6837\u7684\u51fd\u6570\u4e0a\u6ce8\u518c kretprobe \u5c06\u53ef\u80fd\u4e0d\u4f1a\u8fbe\u5230\u9884\u671f\u7684\u6548\u679c\uff0c\u4f8b\u5982do_exit()\u51fd\u6570\u4f1a\u5b58\u5728\u95ee\u9898\uff0c\u800cdo_execve()\u51fd\u6570\u548cdo_fork()\u51fd\u6570\u4e0d\u4f1a\uff1b<\/li>\n
  10. \u5f53\u5728\u8fdb\u5165\u548c\u9000\u51fa\u4e00\u4e2a\u51fd\u6570\u65f6\uff0c\u5982\u679c CPU \u8fd0\u884c\u5728\u975e\u5f53\u524d\u4efb\u52a1\u6240\u6709\u7684\u6808\u4e0a\uff0c\u90a3\u4e48\u5f80\u8be5\u51fd\u6570\u4e0a\u6ce8\u518c kretprobe \u53ef\u80fd\u4f1a\u5bfc\u81f4\u4e0d\u53ef\u9884\u6599\u7684\u540e\u679c\uff0c\u56e0\u6b64\uff0ckprobes \u4e0d\u652f\u6301\u5728 X86_64 \u7684\u7ed3\u6784\u4e0b\u4e3a__switch_to()\u51fd\u6570\u6ce8\u518c kretprobe\uff0c\u5c06\u76f4\u63a5\u8fd4\u56de-EINVAL\u3002<\/li>\n<\/ol>\n

    \u4e8c\u3001\u5b9e\u8df5<\/h1>\n

    1. \u51c6\u5907kernel\u5185\u6838\u6e90\u7801<\/h4>\n

    \u5728\u5bf9\u7cfb\u7edf\u8c03\u7528\u690d\u5165\u63a2\u9488\u7684\u8fc7\u7a0b\u4e2d\uff0c\u6211\u4eec\u9700\u8981\u4e86\u89e3\u5bf9\u5e94\u51fd\u6570\u7684\u53c2\u6570\u548c\u8fd4\u56de\u503c\u5b9a\u4e49\uff0c\u56e0\u6b64\u6211\u4eec\u9700\u8981\u63d0\u524d\u4e0b\u8f7d\u597d\u5bf9\u5e94\u7248\u672c\u7684\u5185\u6838\u6e90\u7801\uff0c\u4ee5\u4fbf\u968f\u65f6\u67e5\u9605\uff1a<\/p>\n

    # \u786e\u8ba4\u76ee\u6807\u8bbe\u5907\u7684linux\u7248\u672c\r\nuname -a\r\n    5.15.0-83-generic\r\n\r\n# \u4e0b\u8f7dkernel\u6e90\u7801\r\ngit clone git@github.com:torvalds\/linux.git   -b v5.15<\/code><\/pre>\n
    2. kprobe ebpf\u7a0b\u5e8f\u5b9e\u4f8b<\/h4>\n
    \u4e3a\u4e86\u65b9\u4fbf\u8c03\u8bd5\uff0c\u6211\u4eec\u8fd9\u91cc\u9009\u53d6\u5185\u6838\u7684do_unlinkat\u51fd\u6570\uff08\u5220\u9664\u6587\u4ef6\u4e8b\u4ef6\uff09\u8fdb\u884c\u81ea\u5b9a\u4e49\u4ee3\u7801\u690d\u5165\u3002<\/p>\n
    2.1 \u5185\u6838do_unlinkat\u51fd\u6570\u5b9a\u4e49<\/h6>\n
    \u5f00\u59cb\u4e4b\u524d\uff0c\u6211\u4eec\u5148\u6765\u770b\u4e0b\u5185\u6838\u6e90\u7801\u4e2d\u8fd9\u4e2a\u51fd\u6570\u7684\u5b9a\u4e49\uff1a<\/p>\n
    cd ~\/project\/linux\r\ngrep -w do_unlinkat -r .\/\r\n    .\/fs\/internal.h:int do_unlinkat(int dfd, struct filename *name);<\/code><\/pre>\n
    \u53ef\u4ee5\u770b\u5230\uff0c\u8be5\u51fd\u6570\u63a5\u53d72\u4e2a\u53c2\u6570\uff1adfd\uff08\u6587\u4ef6\u63cf\u8ff0\u7b26\uff09\u548cname\uff08\u6587\u4ef6\u540d\u7ed3\u6784\u4f53\u6307\u9488\uff09\uff0c\u8fd4\u56de\u503c\u4e3aint\uff0c\u6211\u4eec\u63a5\u4e0b\u6765\u7f16\u5199ebpf\u7a0b\u5e8f\u65f6\u4f1a\u7528\u5230\u8fd9\u4e2a\u5b9a\u4e49\u3002<\/p>\n
    2.2 ebpf\u63a2\u6d4b\u51fd\u6570<\/h6>\n
    \u6211\u4eec\u7f16\u5199\u4e00\u4e2a\u7b80\u5355\u7684kprobe.bpf.c\u7a0b\u5e8f\uff0c\u901a\u8fc7\u4f7f\u4f7f\u7528kprobe\uff08\u5185\u6838\u63a2\u9488\uff09\u5728\u5185\u6838do_unlinkat\u51fd\u6570\u7684\u5165\u53e3\u548c\u9000\u51fa\u4f4d\u7f6e\u6dfb\u52a0\u94a9\u5b50\uff0c\u5b9e\u73b0\u5bf9Linux \u5185\u6838\u4e2d\u7684unlink \u7cfb\u7edf\u8c03\u7528\u7684\u5165\u53e3\u53c2\u6570\u548c\u8fd4\u56de\u503c\u7684\u76d1\u6d4b\u548c\u6355\u83b7\uff1a<\/p>\n
    \/**\r\n * \u901a\u8fc7\u4f7f\u7528 kprobe\uff08\u5185\u6838\u63a2\u9488\uff09\u5728do_unlinkat\u51fd\u6570\u7684\u5165\u53e3\u548c\u9000\u51fa\u5904\u653e\u7f6e\u94a9\u5b50\uff0c\u5b9e\u73b0\u5bf9\u8be5\u7cfb\u7edf\u8c03\u7528\u7684\u8ddf\u8e2a\r\n*\/\r\n#include \"vmlinux.h\"\r\n#include <bpf\/bpf_helpers.h>\r\n#include <bpf\/bpf_tracing.h>\r\n#include <bpf\/bpf_core_read.h>\r\n\r\n\/\/ \u5b9a\u4e49\u8bb8\u53ef\u8bc1\uff0c\u4ee5\u5141\u8bb8\u7a0b\u5e8f\u5728\u5185\u6838\u4e2d\u8fd0\u884c\r\nchar LICENSE[] SEC(\"license\") = \"Dual BSD\/GPL\";\r\n\r\n\/\/ \u5b9a\u4e49\u4e00\u4e2a\u540d\u4e3ado_unlinkat\u7684 kprobe\uff0c\u5f53\u8fdb\u5165do_unlinkat\u51fd\u6570\u65f6\uff0c\u5b83\u4f1a\u88ab\u89e6\u53d1\r\nSEC(\"kprobe\/do_unlinkat\")\r\nint BPF_KPROBE(do_unlinkat, int dfd, struct filename *name) \/\/ \u6355\u83b7\u51fd\u6570\u7684\u53c2\u6570\uff1adfd\uff08\u6587\u4ef6\u63cf\u8ff0\u7b26\uff09\u548cname\uff08\u6587\u4ef6\u540d\u7ed3\u6784\u4f53\u6307\u9488\uff09\r\n{\r\n    pid_t pid;\r\n    const char *filename;\r\n\r\n    \/\/ \u83b7\u53d6\u5f53\u524d\u8fdb\u7a0b\u7684 PID\uff08\u8fdb\u7a0b\u6807\u8bc6\u7b26\uff09\r\n    pid = bpf_get_current_pid_tgid() >> 32;\r\n    \/\/ \u8bfb\u53d6\u6587\u4ef6\u540d\r\n    filename = BPF_CORE_READ(name, name);\r\n    \/\/ \u4f7f\u7528bpf_printk\u51fd\u6570\u5728\u5185\u6838\u65e5\u5fd7\u4e2d\u6253\u5370 PID \u548c\u6587\u4ef6\u540d\r\n    bpf_printk(\"KPROBE ENTRY pid = %d, filename = %s\\n\", pid, filename);\r\n    return 0;\r\n}\r\n\r\n\/\/ \u5b9a\u4e49\u4e00\u4e2a\u540d\u4e3ado_unlinkat_exit\u7684 kretprobe\uff0c\u5f53\u4ecedo_unlinkat\u51fd\u6570\u9000\u51fa\u65f6\uff0c\u5b83\u4f1a\u88ab\u89e6\u53d1\r\nSEC(\"kretprobe\/do_unlinkat\")\r\nint BPF_KRETPROBE(do_unlinkat_exit, long ret) \/\/ \u6355\u83b7\u51fd\u6570\u7684\u8fd4\u56de\u503c\uff08ret\uff09\r\n{\r\n    pid_t pid;\r\n\r\n    \/\/ \u83b7\u53d6\u5f53\u524d\u8fdb\u7a0b\u7684 PID\uff08\u8fdb\u7a0b\u6807\u8bc6\u7b26\uff09\r\n    pid = bpf_get_current_pid_tgid() >> 32;\r\n    \/\/ \u4f7f\u7528bpf_printk\u51fd\u6570\u5728\u5185\u6838\u65e5\u5fd7\u4e2d\u6253\u5370 PID \u548c\u8fd4\u56de\u503c\r\n    bpf_printk(\"KPROBE EXIT: pid = %d, ret = %ld\\n\", pid, ret);\r\n    return 0;\r\n}<\/code><\/pre>\n
    2.3 \u52a0\u8f7d\u7a0b\u5e8f<\/h6>\n
    \u7f16\u5199\u4e00\u4e2abpf\u7528\u6237\u7a7a\u95f4\u7a0b\u5e8f\uff0c\u7528\u4e8e\u52a0\u8f7d\u521a\u624d\u7f16\u5199\u7684ebpf\u94a9\u5b50\u5230\u5185\u6838\u7a7a\u95f4\uff1a<\/p>\n
    \/**\r\n * ebpf \u7528\u6237\u7a7a\u95f4\u7a0b\u5e8f(loader\u3001read ringbuffer)\r\n*\/\r\n#include <stdio.h>\r\n#include <unistd.h>\r\n#include <signal.h>\r\n#include <string.h>\r\n#include <errno.h>\r\n#include <sys\/resource.h>\r\n#include <bpf\/libbpf.h>\r\n#include \"kprobe.skel.h\"\r\n\r\nstatic int libbpf_print_fn(enum libbpf_print_level level, const char *format, va_list args)\r\n{\r\n\treturn vfprintf(stderr, format, args);\r\n}\r\n\r\nstatic volatile sig_atomic_t stop;\r\nstatic void sig_int(int signo)\r\n{\r\n\tstop = 1;\r\n}\r\n\r\nint main(int argc, char **argv)\r\n{\r\n\tstruct kprobe_bpf *skel;\r\n\tint err;\r\n\r\n\t\/* \u8bbe\u7f6elibbpf\u9519\u8bef\u548c\u8c03\u8bd5\u4fe1\u606f\u56de\u8c03 *\/\r\n\tlibbpf_set_print(libbpf_print_fn);\r\n\r\n\t\/* \u52a0\u8f7d\u5e76\u9a8c\u8bc1 kprobe.bpf.c \u5e94\u7528\u7a0b\u5e8f *\/\r\n\tskel = kprobe_bpf__open_and_load();\r\n\tif (!skel) {\r\n\t\tfprintf(stderr, \"Failed to open BPF skeleton\\n\");\r\n\t\treturn 1;\r\n\t}\r\n\r\n\t\/* \u9644\u52a0 kprobe.bpf.c \u7a0b\u5e8f\u5230\u8ddf\u8e2a\u70b9 *\/\r\n\terr = kprobe_bpf__attach(skel);\r\n\tif (err) {\r\n\t\tfprintf(stderr, \"Failed to attach BPF skeleton\\n\");\r\n\t\tgoto cleanup;\r\n\t}\r\n\r\n\t\/* Control-C \u505c\u6b62\u4fe1\u53f7 *\/\r\n\tif (signal(SIGINT, sig_int) == SIG_ERR) {\r\n\t\tfprintf(stderr, \"can't set signal handler: %s\\n\", strerror(errno));\r\n\t\tgoto cleanup;\r\n\t}\r\n\r\n\tprintf(\"Successfully started! Please run `sudo cat \/sys\/kernel\/debug\/tracing\/trace_pipe` \"\r\n\t       \"to see output of the BPF programs.\\n\");\r\n\r\n\twhile (!stop) {\r\n\t\tfprintf(stderr, \".\");\r\n\t\tsleep(1);\r\n\t}\r\n\r\ncleanup:\r\n\t\/* \u9500\u6bc1\u6302\u8f7d\u7684ebpf\u7a0b\u5e8f *\/\r\n\tkprobe_bpf__destroy(skel);\r\n\treturn -err;\r\n}\r\n<\/code><\/pre>\n
    2.4 cmake\u7f16\u8bd1\u914d\u7f6e<\/h6>\n
    \u4e3akprobe.bpf.c\u3001kprobe.c\u914d\u7f6ecmake\u7f16\u8bd1\uff1a<\/p>\n
    cmake_minimum_required(VERSION 3.16)\r\nproject(ebpf_test)\r\n\r\n# find BpfObject\r\nlist(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}\/tools)\r\n\r\n# build libbpf depend\r\ninclude(ExternalProject)\r\nExternalProject_Add(libbpf\r\n  PREFIX libbpf\r\n  SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}\/..\/..\/libbpf\/src\r\n  CONFIGURE_COMMAND \"\"\r\n  BUILD_COMMAND make\r\n    BUILD_STATIC_ONLY=1\r\n    OBJDIR=${CMAKE_CURRENT_BINARY_DIR}\/libbpf\/libbpf\r\n    DESTDIR=${CMAKE_CURRENT_BINARY_DIR}\/libbpf\r\n    INCLUDEDIR=\r\n    LIBDIR=\r\n    UAPIDIR=\r\n    install install_uapi_headers\r\n  BUILD_IN_SOURCE TRUE\r\n  INSTALL_COMMAND \"\"\r\n  STEP_TARGETS build\r\n)\r\n\r\nExternalProject_Add(bpftool\r\n  PREFIX bpftool\r\n  SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}\/..\/..\/bpftool\/src\r\n  CONFIGURE_COMMAND \"\"\r\n  BUILD_COMMAND make bootstrap\r\n    OUTPUT=${CMAKE_CURRENT_BINARY_DIR}\/bpftool\/\r\n  BUILD_IN_SOURCE TRUE\r\n  INSTALL_COMMAND \"\"\r\n  STEP_TARGETS build\r\n)\r\n\r\nfind_program(CARGO_EXISTS cargo)\r\nif(CARGO_EXISTS)\r\n  ExternalProject_Add(blazesym\r\n    PREFIX blazesym\r\n    SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}\/..\/..\/blazesym\r\n    CONFIGURE_COMMAND \"\"\r\n    BUILD_COMMAND cargo build --release\r\n    BUILD_IN_SOURCE TRUE\r\n    INSTALL_COMMAND \"\"\r\n    STEP_TARGETS build\r\n  )\r\nendif()\r\n\r\n# Set BpfObject input parameters\r\nset(BPFOBJECT_BPFTOOL_EXE ${CMAKE_CURRENT_BINARY_DIR}\/bpftool\/bootstrap\/bpftool)\r\nset(BPFOBJECT_VMLINUX_H ${CMAKE_CURRENT_SOURCE_DIR}\/..\/..\/vmlinux\/${ARCH}\/vmlinux.h)\r\nset(LIBBPF_INCLUDE_DIRS ${CMAKE_CURRENT_BINARY_DIR}\/libbpf)\r\nset(LIBBPF_LIBRARIES ${CMAKE_CURRENT_BINARY_DIR}\/libbpf\/libbpf.a)\r\nfind_package(BpfObject REQUIRED)\r\n\r\n# Create an executable for each application\r\nfile(GLOB apps *.bpf.c)\r\nif(NOT CARGO_EXISTS)\r\n  list(REMOVE_ITEM apps ${CMAKE_CURRENT_SOURCE_DIR}\/profile.bpf.c)\r\nendif()\r\nforeach(app ${apps})\r\n  get_filename_component(app_name ${app} NAME_WE)\r\n\r\n  # Build object skeleton and depend skeleton on libbpf build\r\n  bpf_object(${app_name} ${app_name}.bpf.c)\r\n  add_dependencies(${app_name}_skel libbpf-build bpftool-build)\r\n\r\n  add_executable(${app_name} ${app_name}.c)\r\n  target_link_libraries(${app_name} ${app_name}_skel)\r\n  if(${app_name} STREQUAL profile)\r\n    target_include_directories(${app_name} PRIVATE\r\n      ${CMAKE_CURRENT_SOURCE_DIR}\/..\/..\/blazesym\/include)\r\n    target_link_libraries(${app_name}\r\n      ${CMAKE_CURRENT_SOURCE_DIR}\/..\/..\/blazesym\/target\/release\/libblazesym.a -lpthread -lrt -ldl)\r\n  endif()\r\nendforeach()\r\n<\/code><\/pre>\n
    2.5 \u7f16\u8bd1&\u8c03\u8bd5<\/h6>\n
    # \u7f16\u8bd1\r\nmkdir build && cd build\r\ncmake ..\r\nmake\r\n\r\n# \u6302\u8f7d\u81ea\u5b9a\u4e49\u63a2\u9488\u5230\u5185\u6838\r\nsudo .\/kprobe\r\n\r\n# \u76d1\u63a7\u5185\u6838\u65e5\u5fd7\r\nsudo cat \/sys\/kernel\/debug\/tracing\/trace_pipe\r\n\r\n# \u6d4b\u8bd5unlink\u5220\u9664\u4e8b\u4ef6\r\ntouch test1\r\nrm test1\r\ntouch test2\r\nrm test2\r\n\r\n# \u4ece\u76d1\u63a7\u7684\u5185\u6838log\u4e2d\u53ef\u4ee5\u770b\u5230\u63a2\u9488\u5df2\u7ecf\u751f\u6548\r\nsudo cat \/sys\/kernel\/debug\/tracing\/trace_pipe\r\n    rm-260674  [002] d...1 3556349.502552: bpf_trace_printk: KPROBE ENTRY pid = 260674, filename = test1\r\n    rm-260674  [002] d...1 3556349.502574: bpf_trace_printk: KPROBE EXIT: pid = 260674, ret = 0\r\n    rm-260676  [002] d...1 3556349.675106: bpf_trace_printk: KPROBE ENTRY pid = 260676, filename = test2\r\n    rm-260676  [002] d...1 3556349.675144: bpf_trace_printk: KPROBE EXIT: pid = 260676, ret = 0\r\n\r\n<\/code><\/pre>\n
    3. \u4f7f\u7528 ring buffer \u5411\u7528\u6237\u6001\u4f20\u9012\u6570\u636e<\/h4>\n
    \u5728\u521a\u624d\u7684\u5b9e\u4f8b\u91cc\uff0c\u5185\u6838\u6355\u83b7\u5230\u7684\u6570\u636e\u6253\u5370\u5230\u4e86\u5185\u6838log\u4e2d\uff0c\u9700\u8981\u901a\u8fc7\u67e5\u770b \/sys\/kernel\/debug\/tracing\/trace_pipe \u6587\u4ef6\u6765\u83b7\u53d6eBPF\u7a0b\u5e8f\u7684\u8f93\u51fa\u3002<\/p>\n
    \u5728\u4e0a\u4e00\u7bc7\u6587\u7ae0\u91cc\u6211\u4eec\u5b66\u4e60\u4e86BPF Map\uff0c\u6240\u4ee5\u8fd9\u91cc\u6211\u4eec\u628a\u5b83\u4fee\u6539\u4e0b\uff0c\u5c06\u6355\u83b7\u5230\u7684\u6570\u636e\u901a\u8fc7ring buffer\u4ece\u5185\u6838\u7a7a\u95f4\u4f20\u9012\u5230\u7528\u6237\u7a7a\u95f4\u3002\u7528\u6237\u7a7a\u95f4\u83b7\u53d6\u6570\u636e\u540e\uff0c\u53ef\u4ee5\u518d\u8fdb\u884c\u540e\u7eed\u7684\u6570\u636e\u5b58\u50a8\u3001\u5904\u7406\u548c\u5206\u6790\u3002<\/p>\n
    3.1 \u5b9a\u4e49\u5b58\u50a8\u6570\u636e\u7684\u7ed3\u6784\u4f53<\/h6>\n
    \u8fd9\u91cc\u6211\u4eec\u5b9a\u4e49\u4e00\u4e2akprobe.h\u5934\u6587\u4ef6\uff0c\u65b9\u4fbf\u5185\u6838\u7a7a\u95f4\u548c\u7528\u6237\u7a7a\u95f4\u7684\u7a0b\u5e8f\u4f7f\u7528\u540c\u4e00\u4e2a\u6570\u636e\u5b58\u50a8\u7ed3\u6784\u3002<\/p>\n
    #ifndef __KPROBE_H\r\n#define __KPROBE_H\r\n\r\n#define MAX_FILENAME_LEN 256\r\n\r\nstruct event {\r\n    int pid;\r\n    char filename[MAX_FILENAME_LEN];\r\n    bool exit_event;\r\n    unsigned exit_code;\r\n    unsigned long long ns;\r\n};\r\n\r\n#endif<\/code><\/pre>\n
    3.2 \u5185\u6838ebpf\u5b58\u50a8\u6570\u636e\u5230ring buffer<\/h6>\n
    \u4fee\u6539kprobe.bpf.c\uff0c\u5f15\u5165\u6570\u636e\u7ed3\u6784\u5934\u6587\u4ef6\uff1a<\/p>\n
    #include <string.h>\r\n#include \"kprobe.h\"<\/code><\/pre>\n
    \u5b9a\u4e49\u4e00\u4e2a\u540d\u4e3arb\u7684 ring buffer \u7c7b\u578b\u7684Map\uff1a<\/p>\n
    struct {\r\n    __uint(type, BPF_MAP_TYPE_RINGBUF);\r\n    __uint(max_entries, 256 * 1024);    \/\/ 256 KB\r\n} rb<\/span> SEC(\".maps\");<\/code><\/pre>\n
    \u5728ebpf\u63a2\u9488\u51fd\u6570\u4e2d\u4fdd\u5b58\u6570\u636e\u5230ring buffer\uff1a<\/p>\n
    SEC(\"kprobe\/do_unlinkat\")\r\nint BPF_KPROBE(do_unlinkat, int dfd, struct filename *name)  \/\/ \u8be5\u51fd\u6570\u63a5\u53d7\u4e24\u4e2a\u53c2\u6570\uff1adfd\uff08\u6587\u4ef6\u63cf\u8ff0\u7b26\uff09\u548cname\uff08\u6587\u4ef6\u540d\u7ed3\u6784\u4f53\u6307\u9488\uff09\r\n{\r\n    ...\r\n    struct event<\/span> *e;\r\n\r\n    ...\r\n    \/\/ \u9884\u8ba2\u4e00\u4e2aringbuf\u6837\u672c\u7a7a\u95f4\r\n    e = bpf_ringbuf_reserve<\/span>(&rb<\/span>, sizeof(*e<\/span>), 0);\r\n    if (!e)\r\n        return 0;\r\n    \/\/ \u8bbe\u7f6e\u6570\u636e\r\n    e->pid = pid;\r\n    bpf_probe_read_str(&e->filename, sizeof(e->filename), (void *)filename);\r\n\te->exit_event = false;\r\n    e->ns = bpf_ktime_get_ns();\r\n    \/\/ \u63d0\u4ea4\u5230ringbuf\u7528\u6237\u7a7a\u95f4\u8fdb\u884c\u540e\u5904\u7406\r\n    bpf_ringbuf_submit<\/span>(e, 0);\r\n\r\n    return 0;\r\n}<\/code><\/pre>\n
    3.3 \u7528\u6237\u7a7a\u95f4\u8bfb\u53d6ring buffer<\/h6>\n
    \u5b9a\u4e49ring_buffer\u7ed3\u6784\u4f53\u3001handle_event\u56de\u8c03\u51fd\u6570\uff0c\u4f7f\u7528ring_buffer__new(skel->maps.rb\u7684fd, handle_event\u56de\u8c03)\u521d\u59cb\u5316\u7528\u6237\u7a7a\u95f4\u7f13\u51b2\u533a\u5bf9\u8c61\uff0c\u5e76\u4f7f\u7528ring_buffer__poll(rb) \u83b7\u53d6\u5185\u6838ebpf\u7a0b\u5e8f\u4f20\u9012\u7684\u6570\u636e\uff0c\u6536\u5230\u7684\u5185\u6838\u6570\u636e\u53ef\u4ee5\u5728handle_event\u56de\u8c03\u51fd\u6570\u4e2d\u8fdb\u884c\u6253\u5370\u3001\u5b58\u50a8\u3001\u5206\u6790\u7b49\u540e\u7eed\u5904\u7406\u3002<\/p>\n
    \/**\r\n * ebpf \u7528\u6237\u7a7a\u95f4\u7a0b\u5e8f(loader\u3001read ringbuffer)\r\n*\/\r\n...\r\n#include <time.h>\r\n#include \"kprobe.h\"\r\n\r\n...\r\n\r\n\/\/ ring buffer data process\r\nstatic int handle_event<\/span>(void *ctx, void *data, size_t data_sz)\r\n{\r\n\tconst struct event *e = data;\r\n\tstruct tm *tm;\r\n\tchar ts[32];\r\n\ttime_t t;\r\n\r\n\ttime(&t);\r\n\ttm = localtime(&t);\r\n\tstrftime(ts, sizeof(ts), \"%H:%M:%S\", tm);\r\n\r\n\tif (e->exit_event) {\r\n\t\tprintf(\"%-8s %-5s %-16s %-7d [%u]\", ts, \"EXIT\", e->filename, e->pid, e->exit_code);\r\n\t\tif (e->ns)\r\n\t\t\tprintf(\" (%llums)\", e->ns \/ 1000000);\r\n\t\tprintf(\"\\n\");\r\n\t} else {\r\n\t\tprintf(\"%-8s %-5s %-16s %-7d %s\\n\", ts, \"EXEC\", e->filename, e->pid, e->filename);\r\n\t}\r\n\r\n\treturn 0;\r\n}\r\n\r\nint main(int argc, char **argv)\r\n{\r\n\t...\r\n\tstruct ring_buffer<\/span> *rb<\/span> = NULL;\r\n\r\n\t...\r\n\tprintf(\"Successfully started! Please run `sudo cat \/sys\/kernel\/debug\/tracing\/trace_pipe` \"\r\n\t       \"to see output of the BPF programs.\\n\");\r\n\r\n\t\/* \u8bbe\u7f6e\u73af\u5f62\u7f13\u51b2\u533a\u8f6e\u8be2 *\/\r\n\trb = ring_buffer__new<\/span>(bpf_map__fd(skel->maps.rb<\/span>), handle_event<\/span>, NULL, NULL);\r\n\tif (!rb) {\r\n\t\terr = -1;\r\n\t\tfprintf(stderr, \"Failed to create ring buffer\\n\");\r\n\t\tgoto cleanup;\r\n\t}\r\n\r\n\t\/* \u5904\u7406\u6536\u5230\u7684\u5185\u6838\u6570\u636e *\/\r\n\tprintf(\"%-8s %-5s %-16s %-7s %s\\n\", \"TIME\", \"EVENT\", \"FILENAME\", \"PID\", \"FILENAME\/RET\");\r\n\twhile (!stop) {\r\n\t\t\/\/ \u8f6e\u8be2\u5185\u6838\u6570\u636e\r\n\t\terr = ring_buffer__poll<\/span>(rb, 100 \/* timeout, ms *\/);\r\n\t\tif (err == -EINTR) {\t\/* Ctrl-C will cause -EINTR *\/\r\n\t\t\terr = 0;\r\n\t\t\tbreak;\r\n\t\t}\r\n\t\tif (err < 0) {\r\n\t\t\tprintf(\"Error polling perf buffer: %d\\n\", err);\r\n\t\t\tbreak;\r\n\t\t}\r\n\t}\r\n\t\/\/ while (!stop) {\r\n\t\/\/ fprintf(stderr, \".\");\r\n\t\/\/ sleep(1);\r\n\t\/\/ }\r\n\t...\r\n}\r\n<\/code><\/pre>\n
    3.4 \u7f16\u8bd1&\u6d4b\u8bd5<\/h6>\n
    # \u7f16\u8bd1\r\ncmake ..\r\nmake\r\n\r\n# \u6302\u8f7d\u81ea\u5b9a\u4e49\u63a2\u9488\u5230\u5185\u6838\r\nsudo .\/kprobe\r\n\r\n# \u6d4b\u8bd5unlink\u5220\u9664\u4e8b\u4ef6\r\ntouch test.txt\r\nrm test.txt\r\n\r\n\r\n# \u7528\u6237\u7a7a\u95f4\u7a0b\u5e8f\u53ef\u4ee5\u76f4\u63a5\u8f93\u51fa\u5185\u6838\u4f20\u9012\u7684\u6570\u636e\r\nsudo .\/kprobe\r\n    TIME EVENT FILENAME PID FILENAME\/RET\r\n    23:31:03 EXEC test.txt 269717 test.txt\r\n    23:31:03 EXIT 269717 [0] (3567267373ms)\r\n<\/code><\/pre>\n
    \u53ef\u4ee5\u770b\u5230\u5185\u6838\u91c7\u96c6\u5230\u7684\u6570\u636e\u5df2\u7ecf\u987a\u5229ring buffer\u4f20\u9012\u5230\u4e86\u7528\u6237\u7a7a\u95f4\u5e76\u6253\u5370\u4e86\u51fa\u6765\uff0c\u540e\u7eed\u7684\u5b58\u50a8\u3001\u5206\u6790\u7b49\u903b\u8f91\u81ea\u5df1\u5355\u72ec\u5199\u5c31\u884c\uff0c\u5c31\u4e0d\u5728\u8fd9\u91cc\u8d58\u8ff0\u4e86\u3002<\/p>\n
     <\/p>\n
    \u4e09\u3001\u603b\u7ed3<\/h1>\n
    \u4eca\u5929\u6211\u4eec\u5b66\u4e60\u4e86\u5982\u4f55\u4f7f\u7528 eBPF \u7684 kprobe \u548c kretprobe \u6355\u83b7\u7cfb\u7edf\u8c03\u7528\uff0c\u5e76\u901a\u8fc7ring buffer\u5c06\u5185\u6838\u6355\u83b7\u5230\u7684\u6570\u636e\u4f20\u9012\u5230\u7528\u6237\u7a7a\u95f4\u3002\u4e0b\u4e00\u6b21\uff0c\u6211\u4eec\u5c06\u5c1d\u8bd5\u5982\u4f55\u6355\u83b7\u4e00\u4e2a\u81ea\u5b9a\u4e49\u7a0b\u5e8f\u4e2d\u7684\u51fd\u6570\u6216\u53d8\u91cf\u3002\u5982\u679c\u4f60\u5bf9\u5176\u4ed6\u7684\u5185\u5bb9\u611f\u5174\u8da3\uff0c\u4e5f\u53ef\u4ee5\u544a\u8bc9\u6211\uff5e<\/p>\n
     <\/p>\n
    yan 23.12.12<\/p>\n","protected":false},"excerpt":{"rendered":"
    \u5728\u524d\u4e24\u7bc7\u6587\u7ae0\u4e2d\uff0c\u6211\u4eec\u4e86\u89e3\u4e86eBPF\u7684\u57fa\u672c\u77e5\u8bc6\u3002\u672c\u6587\u5f00\u59cb\u8fdb\u884c\u4e00\u6b21\u5177\u4f53\u7684\u5b9e\u8df5\uff0c\u5e26\u5927\u5bb6\u901a\u8fc7kprobe\u5b9e\u73b0\u4e00\u4e2a\u7b80\u5355\u7684 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[1317],"tags":[877,1318,1327,1329,1328],"_links":{"self":[{"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/8062"}],"collection":[{"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=8062"}],"version-history":[{"count":4,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/8062\/revisions"}],"predecessor-version":[{"id":8112,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/8062\/revisions\/8112"}],"wp:attachment":[{"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=8062"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=8062"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=8062"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}