{"id":23973,"date":"2025-01-10T00:27:58","date_gmt":"2025-01-09T16:27:58","guid":{"rendered":"https:\/\/www.yunshan.net\/blog\/?p=23973"},"modified":"2025-01-10T00:27:58","modified_gmt":"2025-01-09T16:27:58","slug":"%e5%a6%82%e4%bd%95%e9%80%9a%e8%bf%87ebpf%e5%ae%9e%e7%8e%b0%e5%ae%9e%e6%97%b6%e7%9a%84%e7%b3%bb%e7%bb%9f%e8%b0%83%e7%94%a8%e8%b7%9f%e8%b8%aa%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.yunshan.net\/blog\/archives\/23973.html","title":{"rendered":"\u5982\u4f55\u901a\u8fc7eBPF\u5b9e\u73b0\u5b9e\u65f6\u7684\u7cfb\u7edf\u8c03\u7528\u8ddf\u8e2a\uff1f"},"content":{"rendered":"

\t\t\t\t\n\n

\"\u5982\u4f55\u901a\u8fc7eBPF\u5b9e\u73b0\u5b9e\u65f6\u7684\u7cfb\u7edf\u8c03\u7528\u8ddf\u8e2a\uff1f\"<\/p>\n\n<\/p>\n\n\n\n

\u5728\u5f53\u4eca\u7684\u4e91\u8ba1\u7b97\u548c\u5fae\u670d\u52a1\u67b6\u6784\u4e2d\uff0c\u7cfb\u7edf\u7684\u5b9e\u65f6\u76d1\u63a7\u548c\u6027\u80fd\u5206\u6790\u53d8\u5f97\u5c24\u4e3a\u91cd\u8981\u3002\u4f20\u7edf\u7684\u7cfb\u7edf\u8c03\u7528\u8ddf\u8e2a\u65b9\u6cd5\u5f80\u5f80\u4f9d\u8d56\u4e8e\u5185\u6838\u6a21\u5757\u6216\u7528\u6237\u7a7a\u95f4\u7684\u5de5\u5177\uff0c\u8fd9\u4e9b\u65b9\u6cd5\u4e0d\u4ec5\u6548\u7387\u4f4e\u4e0b\uff0c\u8fd8\u53ef\u80fd\u5bf9\u7cfb\u7edf\u6027\u80fd\u4ea7\u751f\u663e\u8457\u5f71\u54cd\u3002\u7136\u800c\uff0c\u968f\u7740eBPF\uff08Extended Berkeley Packet Filter\uff09\u6280\u672f\u7684\u5174\u8d77\uff0c\u5b9e\u65f6\u7cfb\u7edf\u8c03\u7528\u8ddf\u8e2a\u7684\u5b9e\u73b0\u53d8\u5f97\u66f4\u52a0\u9ad8\u6548\u548c\u7075\u6d3b\u3002\u672c\u6587\u5c06\u6df1\u5165\u63a2\u8ba8\u5982\u4f55\u901a\u8fc7eBPF\u5b9e\u73b0\u5b9e\u65f6\u7684\u7cfb\u7edf\u8c03\u7528\u8ddf\u8e2a\uff0c\u5e2e\u52a9\u5f00\u53d1\u8005\u548c\u7cfb\u7edf\u7ba1\u7406\u5458\u66f4\u597d\u5730\u7406\u89e3\u548c\u5e94\u7528\u8fd9\u4e00\u6280\u672f\u3002<\/p>\n\n\n\n\n

eBPF\u7b80\u4ecb<\/h3>\n\n\n\n\n

eBPF\u662f\u4e00\u79cd\u9769\u547d\u6027\u7684\u6280\u672f\uff0c\u6700\u521d\u8bbe\u8ba1\u7528\u4e8e\u7f51\u7edc\u6570\u636e\u5305\u7684\u8fc7\u6ee4\uff0c\u4f46\u5982\u4eca\u5df2\u6269\u5c55\u5230\u7cfb\u7edf\u8c03\u7528\u8ddf\u8e2a\u3001\u6027\u80fd\u5206\u6790\u3001\u5b89\u5168\u76d1\u63a7\u7b49\u591a\u4e2a\u9886\u57df\u3002eBPF\u5141\u8bb8\u7528\u6237\u5728\u4e0d\u4fee\u6539\u5185\u6838\u4ee3\u7801\u7684\u60c5\u51b5\u4e0b\uff0c\u5c06\u81ea\u5b9a\u4e49\u7684\u7a0b\u5e8f\u52a0\u8f7d\u5230\u5185\u6838\u4e2d\u6267\u884c\u3002\u8fd9\u79cd\u673a\u5236\u4e0d\u4ec5\u63d0\u9ad8\u4e86\u7cfb\u7edf\u7684\u5b89\u5168\u6027\uff0c\u8fd8\u5927\u5927\u589e\u5f3a\u4e86\u7cfb\u7edf\u7684\u53ef\u89c2\u6d4b\u6027\u3002<\/p>\n\n\n\n\n

\u5b9e\u65f6\u7cfb\u7edf\u8c03\u7528\u8ddf\u8e2a\u7684\u91cd\u8981\u6027<\/h3>\n\n\n\n\n

\u7cfb\u7edf\u8c03\u7528\u662f\u7528\u6237\u7a7a\u95f4\u7a0b\u5e8f\u4e0e\u5185\u6838\u7a7a\u95f4\u4ea4\u4e92\u7684\u6865\u6881\uff0c\u901a\u8fc7\u8ddf\u8e2a\u7cfb\u7edf\u8c03\u7528\uff0c\u6211\u4eec\u53ef\u4ee5\u6df1\u5165\u4e86\u89e3\u5e94\u7528\u7a0b\u5e8f\u7684\u884c\u4e3a\u548c\u6027\u80fd\u74f6\u9888\u3002\u5b9e\u65f6\u7cfb\u7edf\u8c03\u7528\u8ddf\u8e2a<\/strong>\u4e0d\u4ec5\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u5feb\u901f\u5b9a\u4f4d\u95ee\u9898\uff0c\u8fd8\u80fd\u5728\u95ee\u9898\u53d1\u751f\u4e4b\u524d\u8fdb\u884c\u9884\u8b66\uff0c\u4ece\u800c\u63d0\u9ad8\u7cfb\u7edf\u7684\u7a33\u5b9a\u6027\u548c\u53ef\u9760\u6027\u3002<\/p>\n\n\n\n\n

\u5b9e\u73b0\u5b9e\u65f6\u7cfb\u7edf\u8c03\u7528\u8ddf\u8e2a\u7684\u6b65\u9aa4<\/h3>\n\n\n\n\n

1. \u5b89\u88c5\u548c\u914d\u7f6eeBPF\u5de5\u5177\u94fe<\/h4>\n\n\n\n\n

\u9996\u5148\uff0c\u786e\u4fdd\u4f60\u7684\u7cfb\u7edf\u652f\u6301eBPF\u3002\u5927\u591a\u6570\u73b0\u4ee3Linux\u53d1\u884c\u7248\u90fd\u5df2\u7ecf\u5185\u7f6e\u4e86eBPF\u652f\u6301\u3002\u63a5\u4e0b\u6765\uff0c\u5b89\u88c5eBPF\u5de5\u5177\u94fe\uff0c\u5305\u62ecbpftool<\/code>\u3001clang<\/code>\u548cllvm<\/code>\u7b49\u5de5\u5177\u3002\u8fd9\u4e9b\u5de5\u5177\u5c06\u5e2e\u52a9\u6211\u4eec\u7f16\u8bd1\u548c\u52a0\u8f7deBPF\u7a0b\u5e8f\u3002<\/p>\n\n\n\n\n

sudo apt-get install -y clang llvm bpftool
\n<\/code><\/pre>\n\n\n\n\n
2. \u7f16\u5199eBPF\u7a0b\u5e8f<\/h4>\n\n\n\n\n
eBPF\u7a0b\u5e8f\u901a\u5e38\u4f7f\u7528C\u8bed\u8a00\u7f16\u5199\uff0c\u5e76\u901a\u8fc7LLVM\u7f16\u8bd1\u6210eBPF\u5b57\u8282\u7801\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684eBPF\u7a0b\u5e8f\u793a\u4f8b\uff0c\u7528\u4e8e\u8ddf\u8e2aexecve<\/code>\u7cfb\u7edf\u8c03\u7528\uff1a<\/p>\n\n\n\n\n
#include <linux\/bpf.h>
\n#include <bpf\/bpf_helpers.h>
\n
\nSEC("tracepoint\/syscalls\/sys_enter_execve")
\nint bpf_prog(void *ctx) {
\n    char msg[] = "execve called\\n";
\n    bpf_trace_printk(msg, sizeof(msg));
\n    return 0;
\n}
\n
\nchar _license[] SEC("license") = "GPL";
\n<\/code><\/pre>\n\n\n\n\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2aeBPF\u7a0b\u5e8fbpf_prog<\/code>\uff0c\u5e76\u5c06\u5176\u9644\u52a0\u5230sys_enter_execve<\/code>\u8ddf\u8e2a\u70b9\u3002\u6bcf\u5f53execve<\/code>\u7cfb\u7edf\u8c03\u7528\u88ab\u89e6\u53d1\u65f6\uff0c\u7a0b\u5e8f\u5c06\u6253\u5370\u4e00\u6761\u6d88\u606f\u3002<\/p>\n\n\n\n\n
3. \u7f16\u8bd1eBPF\u7a0b\u5e8f<\/h4>\n\n\n\n\n
\u4f7f\u7528clang<\/code>\u5c06C\u4ee3\u7801\u7f16\u8bd1\u6210eBPF\u5b57\u8282\u7801\uff1a<\/p>\n\n\n\n\n
clang -O2 -target bpf -c bpf_prog.c -o bpf_prog.o
\n<\/code><\/pre>\n\n\n\n\n
4. \u52a0\u8f7deBPF\u7a0b\u5e8f<\/h4>\n\n\n\n\n
\u4f7f\u7528bpftool<\/code>\u5c06\u7f16\u8bd1\u597d\u7684eBPF\u5b57\u8282\u7801\u52a0\u8f7d\u5230\u5185\u6838\u4e2d\uff1a<\/p>\n\n\n\n\n
sudo bpftool prog load bpf_prog.o \/sys\/fs\/bpf\/bpf_prog
\n<\/code><\/pre>\n\n\n\n\n
5. \u9644\u52a0eBPF\u7a0b\u5e8f\u5230\u8ddf\u8e2a\u70b9<\/h4>\n\n\n\n\n
\u5c06eBPF\u7a0b\u5e8f\u9644\u52a0\u5230sys_enter_execve<\/code>\u8ddf\u8e2a\u70b9\uff1a<\/p>\n\n\n\n\n
sudo bpftool prog attach \/sys\/fs\/bpf\/bpf_prog tracepoint\/syscalls\/sys_enter_execve
\n<\/code><\/pre>\n\n\n\n\n
6. \u67e5\u770b\u8ddf\u8e2a\u8f93\u51fa<\/h4>\n\n\n\n\n
\u4f7f\u7528dmesg<\/code>\u6216cat \/sys\/kernel\/debug\/tracing\/trace_pipe<\/code>\u67e5\u770beBPF\u7a0b\u5e8f\u7684\u8f93\u51fa\uff1a<\/p>\n\n\n\n\n
sudo cat \/sys\/kernel\/debug\/tracing\/trace_pipe
\n<\/code><\/pre>\n\n\n\n\n
\u4f18\u5316\u548c\u6269\u5c55<\/h3>\n\n\n\n\n
1. \u6027\u80fd\u4f18\u5316<\/h4>\n\n\n\n\n
eBPF\u7a0b\u5e8f\u7684\u6027\u80fd\u4f18\u5316\u81f3\u5173\u91cd\u8981\u3002\u53ef\u4ee5\u901a\u8fc7\u51cf\u5c11\u4e0d\u5fc5\u8981\u7684\u5185\u5b58\u8bbf\u95ee\u3001\u4f7f\u7528\u9ad8\u6548\u7684\u54c8\u5e0c\u8868\u6570\u636e\u7ed3\u6784\u7b49\u65b9\u5f0f\u6765\u63d0\u9ad8\u7a0b\u5e8f\u7684\u6267\u884c\u6548\u7387\u3002\u6b64\u5916\uff0c\u5408\u7406\u4f7f\u7528eBPF\u7684perf_event<\/code>\u673a\u5236\uff0c\u53ef\u4ee5\u5c06\u6570\u636e\u76f4\u63a5\u53d1\u9001\u5230\u7528\u6237\u7a7a\u95f4\uff0c\u51cf\u5c11\u5185\u6838\u548c\u7528\u6237\u7a7a\u95f4\u4e4b\u95f4\u7684\u6570\u636e\u62f7\u8d1d\u3002<\/p>\n\n\n\n\n
2. \u6269\u5c55\u529f\u80fd<\/h4>\n\n\n\n\n
\u9664\u4e86\u7b80\u5355\u7684\u7cfb\u7edf\u8c03\u7528\u8ddf\u8e2a\uff0ceBPF\u8fd8\u53ef\u4ee5\u5b9e\u73b0\u66f4\u590d\u6742\u7684\u529f\u80fd\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u901a\u8fc7eBPF\u7a0b\u5e8f\u6536\u96c6\u7cfb\u7edf\u8c03\u7528\u7684\u53c2\u6570\u3001\u8fd4\u56de\u503c\u3001\u8c03\u7528\u65f6\u95f4\u7b49\u4fe1\u606f\uff0c\u5e76\u5c06\u8fd9\u4e9b\u4fe1\u606f\u5b58\u50a8\u5230\u7528\u6237\u7a7a\u95f4\u7684\u6570\u636e\u5e93\u4e2d\uff0c\u4ee5\u4fbf\u540e\u7eed\u5206\u6790\u3002\u6b64\u5916\uff0c\u8fd8\u53ef\u4ee5\u7ed3\u5408BPF_MAP<\/code>\u673a\u5236\uff0c\u5b9e\u73b0\u5b9e\u65f6\u7684\u7edf\u8ba1\u548c\u805a\u5408\u529f\u80fd\u3002<\/p>\n\n\n\n\n
\u5b9e\u9645\u5e94\u7528\u6848\u4f8b<\/h3>\n\n\n\n\n
1. \u5b89\u5168\u76d1\u63a7<\/h4>\n\n\n\n\n
\u901a\u8fc7eBPF\u5b9e\u65f6\u8ddf\u8e2a\u7cfb\u7edf\u8c03\u7528\uff0c\u53ef\u4ee5\u5feb\u901f\u68c0\u6d4b\u548c\u54cd\u5e94\u6f5c\u5728\u7684\u5b89\u5168\u5a01\u80c1\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u76d1\u63a7execve<\/code>\u7cfb\u7edf\u8c03\u7528\uff0c\u68c0\u6d4b\u662f\u5426\u6709\u6076\u610f\u7a0b\u5e8f\u88ab\u6267\u884c\uff1b\u6216\u8005\u76d1\u63a7open<\/code>\u7cfb\u7edf\u8c03\u7528\uff0c\u68c0\u6d4b\u662f\u5426\u6709\u654f\u611f\u6587\u4ef6\u88ab\u8bbf\u95ee\u3002<\/p>\n\n\n\n\n
2. \u6027\u80fd\u5206\u6790<\/h4>\n\n\n\n\n
\u5728\u6027\u80fd\u5206\u6790\u4e2d\uff0c\u5b9e\u65f6\u7cfb\u7edf\u8c03\u7528\u8ddf\u8e2a\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u5feb\u901f\u5b9a\u4f4d\u6027\u80fd\u74f6\u9888\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u901a\u8fc7\u8ddf\u8e2aread<\/code>\u548cwrite<\/code>\u7cfb\u7edf\u8c03\u7528\uff0c\u5206\u6790I\/O\u64cd\u4f5c\u7684\u6027\u80fd\uff1b\u6216\u8005\u901a\u8fc7\u8ddf\u8e2asched<\/code>\u7cfb\u7edf\u8c03\u7528\uff0c\u5206\u6790\u8fdb\u7a0b\u8c03\u5ea6\u7684\u60c5\u51b5\u3002<\/p>\n\n\n\n\n
\u603b\u7ed3<\/h3>\n\n\n\n\n
\u901a\u8fc7eBPF\u5b9e\u73b0\u5b9e\u65f6\u7684\u7cfb\u7edf\u8c03\u7528\u8ddf\u8e2a\uff0c\u4e0d\u4ec5\u63d0\u9ad8\u4e86\u7cfb\u7edf\u7684\u53ef\u89c2\u6d4b\u6027\uff0c\u8fd8\u5927\u5927\u589e\u5f3a\u4e86\u7cfb\u7edf\u7684\u5b89\u5168\u6027\u548c\u6027\u80fd\u3002eBPF\u6280\u672f<\/strong>\u7684\u7075\u6d3b\u6027\u548c\u9ad8\u6548\u6027\uff0c\u4f7f\u5176\u6210\u4e3a\u73b0\u4ee3\u7cfb\u7edf\u76d1\u63a7\u548c\u5206\u6790\u7684\u91cd\u8981\u5de5\u5177\u3002\u5e0c\u671b\u672c\u6587\u7684\u4ecb\u7ecd\u80fd\u591f\u5e2e\u52a9\u8bfb\u8005\u66f4\u597d\u5730\u7406\u89e3\u548c\u5e94\u7528eBPF\uff0c\u5b9e\u73b0\u66f4\u9ad8\u6548\u7684\u7cfb\u7edf\u8c03\u7528\u8ddf\u8e2a\u3002<\/p>\n\n\n                ]]>\t\t<\/p>\n","protected":false},"excerpt":{"rendered":"
\t\t\t\t\t\t<\/p>\n","protected":false},"author":5,"featured_media":23974,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-23973","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-discussion"],"_links":{"self":[{"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/posts\/23973","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\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/comments?post=23973"}],"version-history":[{"count":0,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/posts\/23973\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/media\/23974"}],"wp:attachment":[{"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/media?parent=23973"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/categories?post=23973"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/tags?post=23973"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}