{"id":37035,"date":"2025-04-18T10:39:48","date_gmt":"2025-04-18T02:39:48","guid":{"rendered":"https:\/\/www.yunshan.net\/blog\/?p=37035"},"modified":"2025-04-18T10:39:48","modified_gmt":"2025-04-18T02:39:48","slug":"%e5%a6%82%e4%bd%95%e9%80%9a%e8%bf%87ebpf%e5%ae%9e%e7%8e%b0%e9%ab%98%e6%95%88%e7%9a%84%e7%b3%bb%e7%bb%9f%e8%b0%83%e7%94%a8%e6%8b%a6%e6%88%aa%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.yunshan.net\/blog\/archives\/37035.html","title":{"rendered":"\u5982\u4f55\u901a\u8fc7eBPF\u5b9e\u73b0\u9ad8\u6548\u7684\u7cfb\u7edf\u8c03\u7528\u62e6\u622a\uff1f"},"content":{"rendered":"

\n

\"\u5982\u4f55\u901a\u8fc7eBPF\u5b9e\u73b0\u9ad8\u6548\u7684\u7cfb\u7edf\u8c03\u7528\u62e6\u622a\uff1f\"<\/p>\n<\/p>\n

\u5728\u6570\u5b57\u5316\u6d6a\u6f6e\u5e2d\u5377\u5168\u7403\u7684\u4eca\u5929\uff0c\u64cd\u4f5c\u7cfb\u7edf\u5185\u6838\u7684\u5b89\u5168\u76d1\u63a7\u4e0e\u6027\u80fd\u4f18\u5316\u5df2\u6210\u4e3a\u5f00\u53d1\u8005\u9762\u4e34\u7684\u5171\u540c\u6311\u6218\u3002\u4f20\u7edf\u7684\u5185\u6838\u6a21\u5757\u5f00\u53d1\u5982\u540c\u5728\u9ad8\u901f\u884c\u9a76\u7684\u5217\u8f66\u4e0a\u66f4\u6362\u96f6\u4ef6\u2014\u2014\u4e0d\u4ec5\u9700\u8981\u505c\u673a\u68c0\u4fee\uff0c\u7a0d\u6709\u4e0d\u614e\u5c31\u4f1a\u5bfc\u81f4\u7cfb\u7edf\u5d29\u6e83\u3002\u5f53Linux 4.8\u7248\u672c\u5f15\u5165eBPF<\/a><\/strong>\u8fd9\u9879\u9769\u547d\u6027\u6280\u672f\u65f6\uff0c\u5185\u6838\u53ef\u89c2\u6d4b\u6027\u9886\u57df\u8fce\u6765\u4e86\u65b0\u7684\u66d9\u5149\u3002\u672c\u6587\u5c06\u6df1\u5165\u89e3\u6790\u5982\u4f55\u501f\u52a9\u8fd9\u9879\u88ab\u79f0\u4e3a”Linux\u8d85\u80fd\u529b”\u7684\u6280\u672f\uff0c\u5b9e\u73b0\u96f6\u505c\u673a<\/strong>\u3001\u4f4e\u5f00\u9500<\/strong>\u7684\u7cfb\u7edf\u8c03\u7528\u62e6\u622a\u65b9\u6848\u3002<\/p>\n

\u4e00\u3001\u91cd\u65b0\u8ba4\u8bc6eBPF<\/a>\u6280\u672f\u5185\u6838<\/h3>\n

eBPF<\/strong>\uff08Extended Berkeley Packet Filter\uff09\u7edd\u4e0d\u4ec5\u662f\u7f51\u7edc\u6570\u636e\u5305\u8fc7\u6ee4\u5de5\u5177\u3002\u8fd9\u9879\u8d77\u6e90\u4e8e1992\u5e74\u7684\u6280\u672f\u7ecf\u8fc7\u8fd1\u4e09\u5341\u5e74\u7684\u6f14\u8fdb\uff0c\u5df2\u53d1\u5c55\u6210\u4e3a\u901a\u7528\u578b\u7684\u5185\u6838\u6267\u884c\u5f15\u64ce\u3002\u5176\u6838\u5fc3\u7a81\u7834\u5728\u4e8e\u6784\u5efa\u4e86\u5b89\u5168\u6c99\u7bb1\u73af\u5883<\/strong>\uff0c\u5141\u8bb8\u7528\u6237\u6001\u7a0b\u5e8f\u5c06\u9a8c\u8bc1\u8fc7\u7684\u5b57\u8282\u7801\u6ce8\u5165\u5185\u6838\uff0c\u5728\u4e0d\u4fee\u6539\u5185\u6838\u6e90\u7801\u3001\u4e0d\u52a0\u8f7d\u5185\u6838\u6a21\u5757\u7684\u524d\u63d0\u4e0b\uff0c\u5b9e\u73b0\u9ad8\u6548\u7684\u7cfb\u7edf\u884c\u4e3a\u89c2\u6d4b\u3002<\/p>\n

\u4e0e\u4f20\u7edf\u7cfb\u7edf\u8c03\u7528\u62e6\u622a\u65b9\u6848\u76f8\u6bd4\uff0ceBPF\u5c55\u73b0\u51fa\u4e09\u5927\u9769\u547d\u6027\u4f18\u52bf\uff1a<\/p>\n

    \n
  1. \u96f6\u6027\u80fd\u635f\u8017<\/strong>\uff1aJIT\u7f16\u8bd1\u5668\u5c06\u5b57\u8282\u7801\u8f6c\u6362\u4e3a\u539f\u751f\u6307\u4ee4\uff0c\u6267\u884c\u6548\u7387\u63a5\u8fd1\u539f\u751f\u5185\u6838\u4ee3\u7801\n<\/li>\n
  2. \u52a8\u6001\u52a0\u8f7d\u673a\u5236<\/strong>\uff1a\u652f\u6301\u5b9e\u65f6\u52a0\u8f7d\/\u5378\u8f7d\u89c2\u6d4b\u903b\u8f91\uff0c\u65e0\u9700\u91cd\u542f\u7cfb\u7edf\u6216\u8fdb\u7a0b\n<\/li>\n
  3. \u5b89\u5168\u9694\u79bb\u6027<\/strong>\uff1a\u4e25\u683c\u7684\u9a8c\u8bc1\u5668\u786e\u4fdd\u7a0b\u5e8f\u4e0d\u4f1a\u5bfc\u81f4\u5185\u6838\u5d29\u6e83\u6216\u5185\u5b58\u6cc4\u6f0f\n<\/li>\n<\/ol>\n

    \u4e8c\u3001\u7cfb\u7edf\u8c03\u7528\u62e6\u622a\u6280\u672f\u6f14\u8fdb<\/h3>\n

    \u5728eBPF\u51fa\u73b0\u524d\uff0c\u7cfb\u7edf\u5f00\u53d1\u8005\u4e3b\u8981\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\u5b9e\u73b0\u8c03\u7528\u62e6\u622a\uff1a<\/p>\n

      \n
    • LD_PRELOAD\u52ab\u6301<\/strong>\uff1a\u4ec5\u9002\u7528\u4e8e\u52a8\u6001\u94fe\u63a5\u5e93\uff0c\u6613\u88ab\u7ed5\u8fc7\n<\/li>\n
    • \u5185\u6838\u6a21\u5757\u5f00\u53d1<\/strong>\uff1a\u9700\u8981\u5904\u7406\u590d\u6742\u7684\u540c\u6b65\u673a\u5236\uff0c\u5b58\u5728\u7a33\u5b9a\u6027\u98ce\u9669\n<\/li>\n
    • ptrace\u7cfb\u7edf\u8c03\u7528<\/strong>\uff1a\u4ea7\u751f\u5927\u91cf\u4e0a\u4e0b\u6587\u5207\u6362\uff0c\u6027\u80fd\u635f\u8017\u9ad8\u8fbe50%\n<\/li>\n<\/ul>\n

      \u8fd9\u4e9b\u4f20\u7edf\u65b9\u6848\u5982\u540c\u7528\u624b\u672f\u5200\u8fdb\u884c\u6728\u5de5\u96d5\u523b\u2014\u2014\u867d\u7136\u80fd\u5b8c\u6210\u4efb\u52a1\uff0c\u4f46\u5b58\u5728\u7cbe\u5ea6\u4e0d\u8db3\u3001\u98ce\u9669\u8fc7\u9ad8\u7b49\u95ee\u9898\u3002\u800ceBPF\u63d0\u4f9b\u7684\u89e3\u51b3\u65b9\u6848\uff0c\u5c31\u50cf\u4e3aLinux\u5185\u6838\u88c5\u4e0a\u4e86\u53ef\u7f16\u7a0b\u7684”\u795e\u7ecf\u63a2\u9488”\uff0c\u5b9e\u73b0\u4e86\u771f\u6b63\u7684\u52a8\u6001\u89c2\u6d4b<\/strong>\u3002<\/p>\n

      \u4e09\u3001eBPF\u62e6\u622a\u5b9e\u73b0\u56db\u6b65\u6cd5<\/h3>\n

      3.1 \u9009\u62e9hook\u70b9\u5b9a\u4f4d<\/h4>\n

      \u7cfb\u7edf\u8c03\u7528\u62e6\u622a\u7684\u5173\u952e\u5728\u4e8e\u9009\u62e9\u5408\u9002\u7684hook\u70b9\u3002eBPF\u63d0\u4f9b\u591a\u79cd\u6302\u8f7d\u9009\u9879\uff1a<\/p>\n

      \/\/ \u8ddf\u8e2a\u7cfb\u7edf\u8c03\u7528\u5165\u53e3  \r\nSEC("tracepoint\/syscalls\/sys_enter_execve")  \r\n  \r\n\/\/ \u6355\u83b7\u7cfb\u7edf\u8c03\u7528\u9000\u51fa  \r\nSEC("tracepoint\/syscalls\/sys_exit_execve")  \r\n  \r\n\/\/ \u4f7f\u7528kprobe\u52a8\u6001\u63d2\u6869  \r\nSEC("kprobe\/__x64_sys_execve")  \r\n<\/code><\/pre>\n
      tracepoint<\/strong>\u5177\u6709\u7a33\u5b9a\u53ef\u9760\u7684\u7279\u6027\uff0c\u800ckprobe<\/strong>\u63d0\u4f9b\u66f4\u5927\u7075\u6d3b\u6027\u3002\u751f\u4ea7\u73af\u5883\u5efa\u8bae\u4f18\u5148\u9009\u62e9tracepoint\u4ee5\u4fdd\u8bc1\u517c\u5bb9\u6027\u3002<\/p>\n
      3.2 \u4e0a\u4e0b\u6587\u6570\u636e\u63d0\u53d6<\/h4>\n
      \u901a\u8fc7bpf\u8f85\u52a9\u51fd\u6570\u83b7\u53d6\u5173\u952e\u53c2\u6570\uff1a<\/p>\n
      bpf_probe_read_user_str(&data.filename, sizeof(data.filename), filename);  \r\nbpf_get_current_pid_tgid();  \r\nbpf_get_current_comm(&data.comm, sizeof(data.comm));  \r\n<\/code><\/pre>\n
      \u8fd9\u91cc\u9700\u8981\u7279\u522b\u6ce8\u610f\u5185\u5b58\u8bbf\u95ee\u5b89\u5168<\/strong>\uff0c\u6240\u6709\u7528\u6237\u7a7a\u95f4\u6307\u9488\u5fc5\u987b\u901a\u8fc7\u9a8c\u8bc1\u5668\u68c0\u67e5\u3002<\/p>\n
      3.3 \u4e8b\u4ef6\u4f20\u8f93\u7ba1\u9053\u6784\u5efa<\/h4>\n
      eBPF maps\u662f\u5b9e\u73b0\u5185\u6838\u5230\u7528\u6237\u7a7a\u95f4\u901a\u4fe1\u7684\u6838\u5fc3\u67a2\u7ebd\u3002\u63a8\u8350\u4f7f\u7528perf_event\u7c7b\u578b\u7684map\u5b9e\u73b0\u9ad8\u6548\u4e8b\u4ef6\u6d41\uff1a<\/p>\n
      struct {  \r\n__uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);  \r\n__uint(key_size, sizeof(u32));  \r\n__uint(value_size, sizeof(u32));  \r\n} events SEC(".maps");  \r\n<\/code><\/pre>\n
      \u7528\u6237\u7a7a\u95f4\u901a\u8fc7mmap\u5185\u5b58\u6620\u5c04\u65b9\u5f0f\u8bfb\u53d6\u6570\u636e\uff0c\u907f\u514d\u9891\u7e41\u7684\u7cfb\u7edf\u8c03\u7528\u5f00\u9500\u3002<\/p>\n
      3.4 \u5b89\u5168\u9a8c\u8bc1\u673a\u5236<\/h4>\n
      eBPF\u9a8c\u8bc1\u5668\u4f1a\u6267\u884c\u8d85\u8fc750\u9879\u5b89\u5168\u68c0\u67e5\uff0c\u5305\u62ec\uff1a<\/p>\n
        \n
      • \u6709\u9650\u5faa\u73af\u6b21\u6570\u9a8c\u8bc1\uff08\u7981\u6b62\u65e0\u9650\u5faa\u73af\uff09\n<\/li>\n
      • \u5185\u5b58\u8d8a\u754c\u8bbf\u95ee\u68c0\u67e5\n<\/li>\n
      • \u65e0\u6548\u6307\u9488\u89e3\u5f15\u7528\u68c0\u6d4b\n<\/li>\n
      • \u5806\u6808\u4f7f\u7528\u91cf\u9650\u5236\uff08\u6700\u5927512\u5b57\u8282\uff09\n<\/li>\n<\/ul>\n
        \u5f00\u53d1\u8fc7\u7a0b\u4e2d\u53ef\u4f7f\u7528bpftool prog dump xlated<\/code>\u67e5\u770b\u9a8c\u8bc1\u5668\u5904\u7406\u540e\u7684\u6307\u4ee4\u5e8f\u5217\uff0c\u8fd9\u5bf9\u8c03\u8bd5\u590d\u6742\u7a0b\u5e8f\u81f3\u5173\u91cd\u8981\u3002<\/p>\n
        \u56db\u3001\u6027\u80fd\u4f18\u5316\u5b9e\u6218\u6280\u5de7<\/h3>\n
          \n
        1. \u70ed\u8def\u5f84\u4f18\u5316<\/strong>\uff1a\u901a\u8fc7BPF_F_NO_PREALLOC<\/code>\u6807\u5fd7\u7981\u7528map\u9884\u5206\u914d\uff0c\u727a\u7272\u5185\u5b58\u6362\u6027\u80fd\n<\/li>\n
        2. \u91c7\u6837\u7b56\u7565<\/strong>\uff1a\u5728hook\u70b9\u6dfb\u52a0\u968f\u673a\u91c7\u6837\u903b\u8f91\uff0c\u964d\u4f4e\u9ad8\u8d1f\u8f7d\u573a\u666f\u4e0b\u7684\u5f00\u9500\n<\/li>\n
        3. \u6279\u5904\u7406\u4f20\u8f93<\/strong>\uff1a\u4f7f\u7528ringbuf\u65b0\u578bmap\u66ff\u4ee3perf_event\uff0c\u63d0\u5347\u541e\u5410\u91cf\n<\/li>\n
        4. JIT\u8c03\u4f18<\/strong>\uff1a\u8c03\u6574\/proc\/sys\/net\/core\/bpf_jit_enable<\/code>\u53c2\u6570\u542f\u7528\u4f18\u5316\u7f16\u8bd1\n<\/li>\n<\/ol>\n
          \u5b9e\u6d4b\u6570\u636e\u663e\u793a\uff0c\u4f18\u5316\u540e\u7684eBPF\u7a0b\u5e8f\u5728\u62e6\u622aexecve\u8c03\u7528\u65f6\uff0c\u6027\u80fd\u635f\u8017\u53ef\u63a7\u5236\u57283%\u4ee5\u5185<\/strong>\uff0c\u76f8\u6bd4\u4f20\u7edf\u65b9\u6848\u6709\u6570\u91cf\u7ea7\u63d0\u5347\u3002<\/p>\n
          \u4e94\u3001\u5178\u578b\u5e94\u7528\u573a\u666f\u89e3\u6790<\/h3>\n
            \n
          1. \u5165\u4fb5\u68c0\u6d4b\u7cfb\u7edf<\/strong>\uff1a\u5b9e\u65f6\u6355\u83b7\u53ef\u7591\u7684\u8fdb\u7a0b\u521b\u5efa\u884c\u4e3a\n<\/li>\n
          2. \u5408\u89c4\u5ba1\u8ba1<\/strong>\uff1a\u8bb0\u5f55\u654f\u611f\u6587\u4ef6\u8bbf\u95ee\u65e5\u5fd7\n<\/li>\n
          3. \u6027\u80fd\u5206\u6790<\/strong>\uff1a\u7edf\u8ba1\u7cfb\u7edf\u8c03\u7528\u65f6\u5ef6\u5206\u5e03\n<\/li>\n
          4. \u5b89\u5168\u6c99\u7bb1<\/strong>\uff1a\u963b\u6b62\u672a\u6388\u6743\u7684\u7f51\u7edc\u8fde\u63a5\n<\/li>\n<\/ol>\n
            \u67d0\u4e91\u670d\u52a1\u5546\u7684\u6848\u4f8b\u663e\u793a\uff0c\u91c7\u7528eBPF\u65b9\u6848\u540e\uff0c\u5176\u5b89\u5168\u5ba1\u8ba1\u7cfb\u7edf\u7684CPU\u4f7f\u7528\u7387\u4ece15%\u964d\u81f32%\uff0c\u65e5\u5fd7\u5904\u7406\u5ef6\u8fdf\u4ece\u6beb\u79d2\u7ea7\u7f29\u77ed\u5230\u5fae\u79d2\u7ea7\u3002<\/p>\n
            \u516d\u3001\u6311\u6218\u4e0e\u5e94\u5bf9\u7b56\u7565<\/h3>\n
            \u5c3d\u7ba1eBPF\u4f18\u52bf\u663e\u8457\uff0c\u5b9e\u8df5\u4e2d\u4ecd\u9700\u6ce8\u610f\uff1a<\/p>\n
              \n
            • \u5185\u6838\u7248\u672c\u5dee\u5f02<\/strong>\uff1a\u901a\u8fc7BTF\u548cCO-RE\u6280\u672f\u5b9e\u73b0\u8de8\u7248\u672c\u517c\u5bb9\n<\/li>\n
            • \u5b89\u5168\u8fb9\u754c\u63a7\u5236<\/strong>\uff1a\u7ed3\u5408capability\u673a\u5236\u9650\u5236\u7279\u6743\u64cd\u4f5c\n<\/li>\n
            • \u8d44\u6e90\u7ade\u4e89<\/strong>\uff1a\u5728map\u64cd\u4f5c\u4e2d\u4f7f\u7528spinlock\u907f\u514d\u7ade\u6001\u6761\u4ef6\n<\/li>\n
            • \u53ef\u89c2\u6d4b\u6027\u6b7b\u89d2<\/strong>\uff1a\u914d\u5408tracepoint\u548cUSDT\u5b9e\u73b0\u5b8c\u6574\u76d1\u63a7\n<\/li>\n<\/ul>\n
              \u6700\u65b0\u53d1\u5e03\u7684BPF Type Format (BTF)<\/strong>\u548cCompile Once – Run Everywhere (CO-RE)<\/strong>\u6280\u672f\uff0c\u6b63\u5728\u5f7b\u5e95\u89e3\u51b3\u517c\u5bb9\u6027\u96be\u9898\u3002\u5f00\u53d1\u8005\u73b0\u5728\u53ef\u4ee5\u6784\u5efa\u80fd\u5728\u591a\u4e2a\u5185\u6838\u7248\u672c\u4e0a\u8fd0\u884c\u7684\u5355\u4e00\u4e8c\u8fdb\u5236\u7a0b\u5e8f\u3002<\/p>\n
              \u7ad9\u5728\u4e91\u539f\u751f\u65f6\u4ee3\u7684\u98ce\u53e3\uff0ceBPF\u6b63\u5728\u91cd\u65b0\u5b9a\u4e49\u7cfb\u7edf\u53ef\u89c2\u6d4b\u6027\u7684\u8fb9\u754c\u3002\u5f53\u6211\u4eec\u5c06\u89c6\u7ebf\u6295\u5411\u66f4\u8fdc\u7684\u672a\u6765\uff0c\u8fd9\u9879\u6280\u672f\u6216\u8bb8\u4f1a\u5f7b\u5e95\u6539\u53d8\u64cd\u4f5c\u7cfb\u7edf\u5185\u6838\u7684\u5f00\u53d1\u8303\u5f0f\u2014\u2014\u4ece\u9700\u8981\u7cbe\u5bc6\u64cd\u4f5c\u7684\u5fc3\u810f\u624b\u672f\uff0c\u8f6c\u53d8\u4e3a\u53ef\u52a8\u6001\u8c03\u6574\u7684\u667a\u80fd\u751f\u6001\u7cfb\u7edf\u3002\u800c\u638c\u63e1eBPF\u7cfb\u7edf\u8c03\u7528\u62e6\u622a\u6280\u672f\uff0c\u6b63\u662f\u6253\u5f00\u8fd9\u6247\u672a\u6765\u7684\u94a5\u5319\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
              \u5728\u6570\u5b57\u5316\u6d6a\u6f6e\u5e2d\u5377\u5168\u7403\u7684\u4eca\u5929\uff0c\u64cd\u4f5c\u7cfb\u7edf\u5185\u6838\u7684\u5b89\u5168\u76d1\u63a7\u4e0e\u6027\u80fd\u4f18\u5316\u5df2\u6210\u4e3a\u5f00\u53d1\u8005\u9762\u4e34\u7684\u5171\u540c\u6311\u6218\u3002\u4f20\u7edf\u7684\u5185\u6838\u6a21\u5757\u5f00\u53d1\u5982\u540c\u5728\u9ad8\u901f\u884c\u9a76\u7684\u5217\u8f66\u4e0a\u66f4\u6362\u96f6\u4ef6\u2014\u2014\u4e0d\u4ec5\u9700\u8981\u505c\u673a\u68c0\u4fee\uff0c\u7a0d\u6709\u4e0d\u614e\u5c31\u4f1a\u5bfc\u81f4\u7cfb\u7edf\u5d29\u6e83\u3002\u5f53Linux 4.8\u7248\u672c\u5f15\u5165eBPF\u8fd9\u9879\u9769\u547d\u6027\u6280\u672f\u65f6\uff0c\u5185\u6838\u53ef\u89c2\u6d4b\u6027\u9886\u57df\u8fce\u6765\u4e86\u65b0\u7684\u66d9\u5149\u3002\u672c\u6587\u5c06\u6df1\u5165\u89e3\u6790\u5982\u4f55\u501f\u52a9\u8fd9\u9879\u88ab\u79f0\u4e3a”Linux\u8d85\u80fd\u529b”\u7684\u6280\u672f\uff0c\u5b9e\u73b0\u96f6\u505c\u673a\u3001\u4f4e\u5f00\u9500\u7684\u7cfb\u7edf\u8c03\u7528\u62e6\u622a\u65b9\u6848\u3002 \u4e00\u3001\u91cd\u65b0\u8ba4\u8bc6eBPF\u6280\u672f\u5185\u6838 eBPF\uff08Extended Berkeley Packet Filter\uff09\u7edd\u4e0d\u4ec5\u662f\u7f51\u7edc\u6570\u636e\u5305\u8fc7\u6ee4\u5de5\u5177\u3002\u8fd9\u9879\u8d77\u6e90\u4e8e1992\u5e74\u7684\u6280\u672f\u7ecf\u8fc7\u8fd1\u4e09\u5341\u5e74\u7684\u6f14\u8fdb\uff0c\u5df2\u53d1\u5c55\u6210\u4e3a\u901a\u7528\u578b\u7684\u5185\u6838\u6267\u884c\u5f15\u64ce\u3002\u5176\u6838\u5fc3\u7a81\u7834\u5728\u4e8e\u6784\u5efa\u4e86\u5b89\u5168\u6c99\u7bb1\u73af\u5883\uff0c\u5141\u8bb8\u7528\u6237\u6001\u7a0b\u5e8f\u5c06\u9a8c\u8bc1\u8fc7\u7684\u5b57\u8282\u7801\u6ce8\u5165\u5185\u6838\uff0c\u5728\u4e0d\u4fee\u6539\u5185\u6838\u6e90\u7801\u3001\u4e0d\u52a0\u8f7d\u5185\u6838\u6a21\u5757\u7684\u524d\u63d0\u4e0b\uff0c\u5b9e\u73b0\u9ad8\u6548\u7684\u7cfb\u7edf\u884c\u4e3a\u89c2\u6d4b\u3002 \u4e0e\u4f20\u7edf\u7cfb\u7edf\u8c03\u7528\u62e6\u622a\u65b9\u6848\u76f8\u6bd4\uff0ceBPF\u5c55\u73b0\u51fa\u4e09\u5927\u9769\u547d\u6027\u4f18\u52bf\uff1a \u96f6\u6027\u80fd\u635f\u8017\uff1aJIT\u7f16\u8bd1\u5668\u5c06\u5b57\u8282\u7801\u8f6c\u6362\u4e3a\u539f\u751f\u6307\u4ee4\uff0c\u6267\u884c\u6548\u7387\u63a5\u8fd1\u539f\u751f\u5185\u6838\u4ee3\u7801 \u52a8\u6001\u52a0\u8f7d\u673a\u5236\uff1a\u652f\u6301\u5b9e\u65f6\u52a0\u8f7d\/\u5378\u8f7d\u89c2\u6d4b\u903b\u8f91\uff0c\u65e0\u9700\u91cd\u542f\u7cfb\u7edf\u6216\u8fdb\u7a0b \u5b89\u5168\u9694\u79bb\u6027\uff1a\u4e25\u683c\u7684\u9a8c\u8bc1\u5668\u786e\u4fdd\u7a0b\u5e8f\u4e0d\u4f1a\u5bfc\u81f4\u5185\u6838\u5d29\u6e83\u6216\u5185\u5b58\u6cc4\u6f0f \u4e8c\u3001\u7cfb\u7edf\u8c03\u7528\u62e6\u622a\u6280\u672f\u6f14\u8fdb \u5728eBPF\u51fa\u73b0\u524d\uff0c\u7cfb\u7edf\u5f00\u53d1\u8005\u4e3b\u8981\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\u5b9e\u73b0\u8c03\u7528\u62e6\u622a\uff1a LD_PRELOAD\u52ab\u6301\uff1a\u4ec5\u9002\u7528\u4e8e\u52a8\u6001\u94fe\u63a5\u5e93\uff0c\u6613\u88ab\u7ed5\u8fc7 \u5185\u6838\u6a21\u5757\u5f00\u53d1\uff1a\u9700\u8981\u5904\u7406\u590d\u6742\u7684\u540c\u6b65\u673a\u5236\uff0c\u5b58\u5728\u7a33\u5b9a\u6027\u98ce\u9669 ptrace\u7cfb\u7edf\u8c03\u7528\uff1a\u4ea7\u751f\u5927\u91cf\u4e0a\u4e0b\u6587\u5207\u6362\uff0c\u6027\u80fd\u635f\u8017\u9ad8\u8fbe50% \u8fd9\u4e9b\u4f20\u7edf\u65b9\u6848\u5982\u540c\u7528\u624b\u672f\u5200\u8fdb\u884c\u6728\u5de5\u96d5\u523b\u2014\u2014\u867d\u7136\u80fd\u5b8c\u6210\u4efb\u52a1\uff0c\u4f46\u5b58\u5728\u7cbe\u5ea6\u4e0d\u8db3\u3001\u98ce\u9669\u8fc7\u9ad8\u7b49\u95ee\u9898\u3002\u800ceBPF\u63d0\u4f9b\u7684\u89e3\u51b3\u65b9\u6848\uff0c\u5c31\u50cf\u4e3aLinux\u5185\u6838\u88c5\u4e0a\u4e86\u53ef\u7f16\u7a0b\u7684”\u795e\u7ecf\u63a2\u9488”\uff0c\u5b9e\u73b0\u4e86\u771f\u6b63\u7684\u52a8\u6001\u89c2\u6d4b\u3002 \u4e09\u3001eBPF\u62e6\u622a\u5b9e\u73b0\u56db\u6b65\u6cd5 3.1 \u9009\u62e9hook\u70b9\u5b9a\u4f4d \u7cfb\u7edf\u8c03\u7528\u62e6\u622a\u7684\u5173\u952e\u5728\u4e8e\u9009\u62e9\u5408\u9002\u7684hook\u70b9\u3002eBPF\u63d0\u4f9b\u591a\u79cd\u6302\u8f7d\u9009\u9879\uff1a \/\/ \u8ddf\u8e2a\u7cfb\u7edf\u8c03\u7528\u5165\u53e3 SEC("tracepoint\/syscalls\/sys_enter_execve") \/\/ \u6355\u83b7\u7cfb\u7edf\u8c03\u7528\u9000\u51fa SEC("tracepoint\/syscalls\/sys_exit_execve") \/\/ \u4f7f\u7528kprobe\u52a8\u6001\u63d2\u6869 SEC("kprobe\/__x64_sys_execve") tracepoint\u5177\u6709\u7a33\u5b9a\u53ef\u9760\u7684\u7279\u6027\uff0c\u800ckprobe\u63d0\u4f9b\u66f4\u5927\u7075\u6d3b\u6027\u3002\u751f\u4ea7\u73af\u5883\u5efa\u8bae\u4f18\u5148\u9009\u62e9tracepoint\u4ee5\u4fdd\u8bc1\u517c\u5bb9\u6027\u3002 3.2 \u4e0a\u4e0b\u6587\u6570\u636e\u63d0\u53d6 \u901a\u8fc7bpf\u8f85\u52a9\u51fd\u6570\u83b7\u53d6\u5173\u952e\u53c2\u6570\uff1a bpf_probe_read_user_str(&data.filename, sizeof(data.filename), filename); bpf_get_current_pid_tgid(); bpf_get_current_comm(&data.comm, sizeof(data.comm)); \u8fd9\u91cc\u9700\u8981\u7279\u522b\u6ce8\u610f\u5185\u5b58\u8bbf\u95ee\u5b89\u5168\uff0c\u6240\u6709\u7528\u6237\u7a7a\u95f4\u6307\u9488\u5fc5\u987b\u901a\u8fc7\u9a8c\u8bc1\u5668\u68c0\u67e5\u3002 3.3 \u4e8b\u4ef6\u4f20\u8f93\u7ba1\u9053\u6784\u5efa eBPF maps\u662f\u5b9e\u73b0\u5185\u6838\u5230\u7528\u6237\u7a7a\u95f4\u901a\u4fe1\u7684\u6838\u5fc3\u67a2\u7ebd\u3002\u63a8\u8350\u4f7f\u7528perf_event\u7c7b\u578b\u7684map\u5b9e\u73b0\u9ad8\u6548\u4e8b\u4ef6\u6d41\uff1a struct { __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); __uint(key_size, sizeof(u32)); __uint(value_size, sizeof(u32)); } events […]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14],"tags":[],"class_list":["post-37035","post","type-post","status-publish","format-standard","hentry","category-product-news"],"_links":{"self":[{"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/posts\/37035","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/comments?post=37035"}],"version-history":[{"count":1,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/posts\/37035\/revisions"}],"predecessor-version":[{"id":37037,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/posts\/37035\/revisions\/37037"}],"wp:attachment":[{"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/media?parent=37035"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/categories?post=37035"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/tags?post=37035"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}