{"id":37817,"date":"2025-04-22T21:34:07","date_gmt":"2025-04-22T13:34:07","guid":{"rendered":"https:\/\/www.yunshan.net\/blog\/?p=37817"},"modified":"2025-04-22T21:34:07","modified_gmt":"2025-04-22T13:34:07","slug":"ebpf%e4%b8%ad%e7%9a%84ebpf","status":"publish","type":"post","link":"https:\/\/www.yunshan.net\/blog\/archives\/37817.html","title":{"rendered":"Ebpf\u4e2d\u7684eBPF"},"content":{"rendered":"

\n

\"Ebpf\u4e2d\u7684eBPF_SYSPROCLISTFMTARGDATATYPEDATTYPEARG\u5b8f\u505a\u4e86\u4ec0\u4e48\"<\/p>\n<\/p>\n

Ebpf\u4e2d\u7684eBPF_SYSPROCLISTFMTARGDATATYPEDATTYPEARG\u5b8f\u505a\u4e86\u4ec0\u4e48\uff1f<\/h2>\n

\u4e00\u3001<\/h2>\n

\u5728\u6df1\u5165\u63a2\u8ba8eBPF_SYSPROCLISTFMTARGDATATYPEDATTYPEARG\u5b8f\u4e4b\u524d\uff0c\u6211\u4eec\u9996\u5148\u9700\u8981\u4e86\u89e3\u4e00\u4e0bEBPF\uff08Extended Berkeley Packet Filter\uff09\u662f\u4ec0\u4e48\u3002EBPF\u662f\u4e00\u79cd\u5185\u6838\u6280\u672f\uff0c\u5b83\u5141\u8bb8\u7528\u6237\u5728\u4e0d\u4fee\u6539\u5185\u6838\u6e90\u4ee3\u7801\u7684\u60c5\u51b5\u4e0b\uff0c\u5728\u5185\u6838\u7a7a\u95f4\u8fd0\u884c\u81ea\u5b9a\u4e49\u7684\u7a0b\u5e8f\u3002\u8fd9\u79cd\u80fd\u529b\u4e3a\u7cfb\u7edf\u7ba1\u7406\u5458\u548c\u5f00\u53d1\u8005\u63d0\u4f9b\u4e86\u5f3a\u5927\u7684\u5de5\u5177\u6765\u76d1\u63a7\u548c\u7ba1\u7406\u7cfb\u7edf\u884c\u4e3a\u3002<\/p>\n

\u5728EBPF\u7684\u751f\u6001\u7cfb\u7edf\u4e2d\uff0ceBPF_SYSPROCLISTFMTARGDATATYPEDATTYPEARG\u5b8f\u662f\u4e00\u4e2a\u91cd\u8981\u7684\u7ec4\u6210\u90e8\u5206\u3002\u8fd9\u4e2a\u5b8f\u5728\u5904\u7406\u7cfb\u7edf\u8c03\u7528\u7684\u53c2\u6570\u683c\u5f0f\u5316\u548c\u7c7b\u578b\u68c0\u67e5\u65b9\u9762\u626e\u6f14\u4e86\u91cd\u8981\u89d2\u8272\u3002\u901a\u8fc7\u4f7f\u7528\u8fd9\u4e2a\u5b8f\uff0c\u5f00\u53d1\u8005\u53ef\u4ee5\u786e\u4fdd\u4f20\u9012\u7ed9\u7cfb\u7edf\u8c03\u7528\u7684\u53c2\u6570\u7c7b\u578b\u6b63\u786e\uff0c\u4ece\u800c\u63d0\u9ad8\u7cfb\u7edf\u7684\u7a33\u5b9a\u6027\u548c\u5b89\u5168\u6027\u3002<\/p>\n

\u4e8c\u3001eBPF_SYSPROCLISTFMTARGDATATYPEDATTYPEARG\u5b8f\u7684\u5b9a\u4e49\u548c\u529f\u80fd<\/h2>\n

1. \u5b8f\u7684\u5b9a\u4e49<\/h2>\n

eBPF_SYSPROCLISTFMTARGDATATYPEDATTYPEARG\u5b8f\u7684\u5b9a\u4e49\u5982\u4e0b\uff1a<\/p>\n

define eBPF_SYSPROCLISTFMTARGDATATYPEDATTYPEARG(fmt, type, arg) <\/p>\n

({ <\/p>\n

typeof(arg) _arg = (arg); <\/p>\n

if (unlikely(!__builtin_types_compatible_p(typeof(_arg), type))) { <\/p>\n

bpf_trace_printk(“invalid argument type for ” fmt “<\/p>\n

); <\/p>\n

return -EINVAL; <\/p>\n

} <\/p>\n

_arg; <\/p>\n

})<\/p>\n

\u8fd9\u4e2a\u5b8f\u63a5\u53d7\u4e09\u4e2a\u53c2\u6570\uff1a`fmt`\u3001`type`\u548c`arg`\u3002`fmt`\u662f\u4e00\u4e2a\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\uff0c\u7528\u4e8e\u6307\u5b9a\u9519\u8bef\u6d88\u606f\u7684\u8f93\u51fa\u683c\u5f0f\uff1b`type`\u662f\u671f\u671b\u7684\u53c2\u6570\u7c7b\u578b\uff1b`arg`\u662f\u5b9e\u9645\u4f20\u9012\u7ed9\u7cfb\u7edf\u8c03\u7528\u7684\u53c2\u6570\u3002<\/p>\n

2. \u529f\u80fd\u6982\u8ff0<\/h2>\n

eBPF_SYSPROCLISTFMTARGDATATYPEDATTYPEARG\u5b8f\u7684\u4e3b\u8981\u529f\u80fd\u662f\u8fdb\u884c\u53c2\u6570\u7c7b\u578b\u68c0\u67e5\u548c\u683c\u5f0f\u5316\u3002\u5728\u5b8f\u5185\u90e8\uff0c\u5b83\u9996\u5148\u4f7f\u7528`typeof`\u64cd\u4f5c\u7b26\u83b7\u53d6\u5b9e\u9645\u53c2\u6570`arg`\u7684\u7c7b\u578b\uff0c\u7136\u540e\u4f7f\u7528`__builtin_types_compatible_p`\u5185\u5efa\u51fd\u6570\u6bd4\u8f83\u5b9e\u9645\u53c2\u6570\u7c7b\u578b\u548c\u671f\u671b\u53c2\u6570\u7c7b\u578b`type`\u3002\u5982\u679c\u7c7b\u578b\u4e0d\u5339\u914d\uff0c\u5b8f\u4f1a\u8f93\u51fa\u9519\u8bef\u6d88\u606f\u5e76\u8fd4\u56de-EINVAL\uff0c\u8868\u793a\u65e0\u6548\u7684\u53c2\u6570\u7c7b\u578b\u3002<\/p>\n

\u8fd9\u6837\u7684\u8bbe\u8ba1\u786e\u4fdd\u4e86\u53ea\u6709\u5f53\u53c2\u6570\u7c7b\u578b\u6b63\u786e\u65f6\uff0c\u7cfb\u7edf\u8c03\u7528\u624d\u4f1a\u88ab\u6267\u884c\uff0c\u4ece\u800c\u589e\u5f3a\u4e86\u7cfb\u7edf\u7684\u7a33\u5b9a\u6027\u548c\u5b89\u5168\u6027\u3002\u901a\u8fc7\u4f7f\u7528\u683c\u5f0f\u5316\u5b57\u7b26\u4e32`fmt`\uff0c\u5b8f\u8fd8\u63d0\u4f9b\u4e86\u7075\u6d3b\u7684\u9519\u8bef\u6d88\u606f\u8f93\u51fa\uff0c\u65b9\u4fbf\u8c03\u8bd5\u548c\u9519\u8bef\u8ffd\u8e2a\u3002<\/p>\n

\u4e09\u3001eBPF_SYSPROCLISTFMTARGDATATYPEDATTYPEARG\u5b8f\u5728Ebpf\u4e2d\u7684\u5e94\u7528<\/h2>\n

1. \u7cfb\u7edf\u8c03\u7528\u7684\u5b89\u5168\u5f3a\u5316<\/h2>\n

\u5728Ebpf\u4e2d\uff0ceBPF_SYSPROCLISTFMTARGDATATYPEDATTYPEARG\u5b8f\u88ab\u5e7f\u6cdb\u5e94\u7528\u4e8e\u7cfb\u7edf\u8c03\u7528\u7684\u5b89\u5168\u5f3a\u5316\u3002\u4f8b\u5982\uff0c\u8003\u8651\u5982\u4e0b\u7684\u7cfb\u7edf\u8c03\u7528\u5305\u88c5\u51fd\u6570\uff1a<\/p>\n

int my_syscall(int arg1, const char arg2) {<\/p>\n

\/\/ \u4f7f\u7528eBPF_SYSPROCLISTFMTARGDATATYPEDATTYPEARG\u5b8f\u8fdb\u884c\u53c2\u6570\u7c7b\u578b\u68c0\u67e5<\/p>\n

int validated_arg1 = eBPF_SYSPROCLISTFMTARGDATATYPEDATTYPEARG(“arg1”, int, arg1);<\/p>\n

const char validated_arg2 = eBPF_SYSPROCLISTFMTARGDATATYPEDATTYPEARG(“arg2”, const char , arg2);<\/p>\n

\/\/ \u6267\u884c\u7cfb\u7edf\u8c03\u7528<\/p>\n

return sys_my_syscall(validated_arg1, validated_arg2);<\/p>\n

\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c`my_syscall`\u51fd\u6570\u9996\u5148\u4f7f\u7528eBPF_SYSPROCLISTFMTARGDATATYPEDATTYPEARG\u5b8f\u5bf9\u4f20\u5165\u7684\u53c2\u6570`arg1`\u548c`arg2`\u8fdb\u884c\u7c7b\u578b\u68c0\u67e5\uff0c\u786e\u4fdd\u5b83\u4eec\u5206\u522b\u662f`int`\u548c`const char`\u7c7b\u578b\u3002\u53ea\u6709\u5f53\u53c2\u6570\u7c7b\u578b\u6b63\u786e\u65f6\uff0c\u624d\u4f1a\u6267\u884c\u5b9e\u9645\u7684\u7cfb\u7edf\u8c03\u7528`sys_my_syscall`\u3002<\/p>\n

\u8fd9\u79cd\u65b9\u6cd5\u4e0d\u4ec5\u63d0\u9ad8\u4e86\u7cfb\u7edf\u8c03\u7528\u7684\u5b89\u5168\u6027\uff0c\u8fd8\u5927\u5927\u51cf\u5c11\u4e86\u56e0\u53c2\u6570\u7c7b\u578b\u9519\u8bef\u800c\u5bfc\u81f4\u7684\u7cfb\u7edf\u6545\u969c\u548c\u5b89\u5168\u6f0f\u6d1e\u3002<\/p>\n

2. \u5185\u6838\u6001\u548c\u7528\u6237\u6001\u6570\u636e\u4ea4\u4e92\u7684\u89c4\u8303\u5316<\/h2>\n

\u5728Ebpf\u7a0b\u5e8f\u4e2d\uff0c\u7ecf\u5e38\u9700\u8981\u5728\u5185\u6838\u6001\u548c\u7528\u6237\u6001\u4e4b\u95f4\u4f20\u9012\u6570\u636e\u3002eBPF_SYSPROCLISTFMTARGDATATYPEDATTYPEARG\u5b8f\u901a\u8fc7\u4e25\u683c\u7684\u7c7b\u578b\u68c0\u67e5\uff0c\u786e\u4fdd\u4e86\u8fd9\u79cd\u6570\u636e\u4ea4\u4e92\u7684\u89c4\u8303\u6027\u548c\u5b89\u5168\u6027\u3002<\/p>\n

\u4f8b\u5982\uff0c\u4e00\u4e2aEbpf\u7a0b\u5e8f\u53ef\u80fd\u9700\u8981\u4ece\u7528\u6237\u6001\u8bfb\u53d6\u914d\u7f6e\u6570\u636e\uff0c\u7136\u540e\u5c06\u5176\u4f20\u9012\u7ed9\u5185\u6838\u6001\u8fdb\u884c\u5904\u7406\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u4f7f\u7528eBPF_SYSPROCLISTFMTARGDATATYPEDATTYPEARG\u5b8f\u6765\u9a8c\u8bc1\u7528\u6237\u8f93\u5165\u7684\u7c7b\u578b\u662f\u5426\u6b63\u786e\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n

struct my_config {<\/p>\n

int param1;<\/p>\n

char param2[32];<\/p>\n

};<\/p>\n

SEC(“my_program”)<\/p>\n

int my_bpf_program(struct __sk_buff skb) {<\/p>\n

\/\/ \u4ece\u7528\u6237\u6001\u8bfb\u53d6\u914d\u7f6e\u6570\u636e<\/p>\n

struct my_config config = {};<\/p>\n

bpf_probe_read_user(&config, sizeof(config), user_config_ptr);<\/p>\n

\/\/ \u4f7f\u7528eBPF_SYSPROCLISTFMTARGDATATYPEDATTYPEARG\u5b8f\u8fdb\u884c\u53c2\u6570\u7c7b\u578b\u68c0\u67e5<\/p>\n

int validated_param1 = eBPF_SYSPROCLISTFMTARGDATATYPEDATTYPEARG(“param1”, int, config.param1);<\/p>\n

char validated_param2 = eBPF_SYSPROCLISTFMTARGDATATYPEDATTYPEARG(“param2”, char , config.param2);<\/p>\n

\/\/ \u5c06\u9a8c\u8bc1\u540e\u7684\u6570\u636e\u4f20\u9012\u7ed9\u5185\u6838\u6001\u8fdb\u884c\u5904\u7406<\/p>\n

process_config(validated_param1, validated_param2);<\/p>\n

return 0;<\/p>\n

\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c`my_bpf_program`\u9996\u5148\u4ece\u7528\u6237\u6001\u8bfb\u53d6\u914d\u7f6e\u6570\u636e\u5230`config`\u7ed3\u6784\u4f53\u4e2d\uff0c\u7136\u540e\u4f7f\u7528eBPF_SYSPROCLISTFMTARGDATATYPEDATTYPEARG\u5b8f\u5bf9\u7ed3\u6784\u4f53\u4e2d\u7684\u6bcf\u4e2a\u6210\u5458\u8fdb\u884c\u7c7b\u578b\u68c0\u67e5\u3002\u53ea\u6709\u5f53\u6240\u6709\u6210\u5458\u7684\u7c7b\u578b\u90fd\u6b63\u786e\u65f6\uff0c\u624d\u4f1a\u5c06\u6570\u636e\u4f20\u9012\u7ed9`process_config`\u51fd\u6570\u8fdb\u884c\u8fdb\u4e00\u6b65\u5904\u7406\u3002<\/p>\n

\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\uff0ceBPF_SYSPROCLISTFMTARGDATATYPEDATTYPEARG\u5b8f\u786e\u4fdd\u4e86\u5185\u6838\u6001\u548c\u7528\u6237\u6001\u4e4b\u95f4\u6570\u636e\u4ea4\u4e92\u7684\u89c4\u8303\u6027\u548c\u5b89\u5168\u6027\uff0c\u9632\u6b62\u4e86\u56e0\u6570\u636e\u7c7b\u578b\u4e0d\u5339\u914d\u800c\u53ef\u80fd\u5bfc\u81f4\u7684\u7cfb\u7edf\u9519\u8bef\u548c\u5b89\u5168\u98ce\u9669\u3002<\/p>\n

\u56db\u3001eBPF_SYSPROCLISTFMTARGDATATYPEDATTYPEARG\u5b8f\u7684\u6027\u80fd\u5f71\u54cd<\/h2>\n

\u867d\u7136eBPF_SYSPROCLISTFMTARGDATATYPEDATTYPEARG\u5b8f\u63d0\u4f9b\u4e86\u663e\u8457\u7684\u5b89\u5168\u6027\u548c\u7a33\u5b9a\u6027\u4f18\u52bf\uff0c\u4f46\u4e5f\u53ef\u80fd\u5e26\u6765\u4e00\u4e9b\u6027\u80fd\u5f00\u9500\u3002\u6bcf\u6b21\u7cfb\u7edf\u8c03\u7528\u65f6\u8fdb\u884c\u7684\u7c7b\u578b\u68c0\u67e5\u90fd\u4f1a\u6d88\u8017\u4e00\u5b9a\u7684CPU\u65f6\u95f4\uff0c\u7279\u522b\u662f\u5728\u9891\u7e41\u8c03\u7528\u7684\u7cfb\u7edf\u8c03\u7528\u4e2d\uff0c\u8fd9\u79cd\u5f00\u9500\u53ef\u80fd\u4f1a\u7d2f\u79ef\u3002<\/p>\n

\u8fd9\u79cd\u6027\u80fd\u5f71\u54cd\u901a\u5e38\u662f\u5fae\u5c0f\u7684\uff0c\u5e76\u4e14\u53ef\u4ee5\u901a\u8fc7\u4f18\u5316\u7b56\u7565\u6765\u7f13\u89e3\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u5728\u7f16\u8bd1\u65f6\u8fdb\u884c\u66f4\u591a\u7684\u9759\u6001\u5206\u6790\uff0c\u4ee5\u51cf\u5c11\u8fd0\u884c\u65f6\u7684\u7c7b\u578b\u68c0\u67e5\u6b21\u6570\u3002\u5bf9\u4e8e\u90a3\u4e9b\u5bf9\u6027\u80fd\u8981\u6c42\u6781\u9ad8\u7684\u573a\u666f\uff0c\u53ef\u4ee5\u6709\u9009\u62e9\u5730\u7981\u7528\u67d0\u4e9b\u7c7b\u578b\u68c0\u67e5\uff0c\u4ec5\u5728\u5f00\u53d1\u548c\u6d4b\u8bd5\u9636\u6bb5\u4f7f\u7528\uff0c\u4ee5\u5e73\u8861\u5b89\u5168\u6027\u548c\u6027\u80fd\u9700\u6c42\u3002<\/p>\n

eBPF_SYSPROCLISTFMTARGDATATYPEDATTYPEARG\u5b8f\u5728Ebpf\u4e2d\u8d77\u5230\u4e86\u81f3\u5173\u91cd\u8981\u7684\u4f5c\u7528\u3002\u901a\u8fc7\u63d0\u4f9b\u4e25\u683c\u7684\u53c2\u6570\u7c7b\u578b\u68c0\u67e5\u548c\u683c\u5f0f\u5316\uff0c\u8fd9\u4e2a\u5b8f\u5927\u5927\u589e\u5f3a\u4e86\u7cfb\u7edf\u8c03\u7528\u7684\u5b89\u5168\u6027\u548c\u7a33\u5b9a\u6027\u3002\u867d\u7136\u5728\u4e00\u5b9a\u7a0b\u5ea6\u4e0a\u53ef\u80fd\u5f71\u54cd\u6027\u80fd\uff0c\u4f46\u8fd9\u79cd\u5f71\u54cd\u901a\u5e38\u662f\u53ef\u4ee5\u63a5\u53d7\u7684\uff0c\u5e76\u4e14\u53ef\u4ee5\u901a\u8fc7\u4f18\u5316\u7b56\u7565\u6765\u964d\u4f4e\u3002<\/p>\n

\u5728\u672a\u6765\u7684\u7814\u7a76\u4e2d\uff0c\u53ef\u4ee5\u8fdb\u4e00\u6b65\u63a2\u7d22\u5982\u4f55\u5728\u7f16\u8bd1\u65f6\u8fdb\u884c\u66f4\u591a\u7684\u9759\u6001\u5206\u6790\uff0c\u4ee5\u51cf\u5c11\u8fd0\u884c\u65f6\u7684\u7c7b\u578b\u68c0\u67e5\u5f00\u9500\u3002\u8fd8\u53ef\u4ee5\u7814\u7a76\u5982\u4f55\u66f4\u597d\u5730\u5e73\u8861\u5b89\u5168\u6027\u548c\u6027\u80fd\uff0c\u4ee5\u4fbf\u5728\u4e0d\u540c\u7684\u5e94\u7528\u573a\u666f\u4e2d\u7075\u6d3b\u4f7f\u7528eBPF_SYSPROCLISTFMTARGDATATYPEDATTYPEARG\u5b8f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

Ebpf\u4e2d\u7684eBPF_SYSPROCLISTFMTARGDATATYPEDATTYPEARG\u5b8f\u505a\u4e86\u4ec0\u4e48\uff1f \u4e00\u3001 \u5728\u6df1\u5165\u63a2\u8ba8eBPF_SYSPROCLISTFMTARGDATATYPEDATTYPEARG\u5b8f\u4e4b\u524d\uff0c\u6211\u4eec\u9996\u5148\u9700\u8981\u4e86\u89e3\u4e00\u4e0bEBPF\uff08Extended Berkeley Packet Filter\uff09\u662f\u4ec0\u4e48\u3002EBPF\u662f\u4e00\u79cd\u5185\u6838\u6280\u672f\uff0c\u5b83\u5141\u8bb8\u7528\u6237\u5728\u4e0d\u4fee\u6539\u5185\u6838\u6e90\u4ee3\u7801\u7684\u60c5\u51b5\u4e0b\uff0c\u5728\u5185\u6838\u7a7a\u95f4\u8fd0\u884c\u81ea\u5b9a\u4e49\u7684\u7a0b\u5e8f\u3002\u8fd9\u79cd\u80fd\u529b\u4e3a\u7cfb\u7edf\u7ba1\u7406\u5458\u548c\u5f00\u53d1\u8005\u63d0\u4f9b\u4e86\u5f3a\u5927\u7684\u5de5\u5177\u6765\u76d1\u63a7\u548c\u7ba1\u7406\u7cfb\u7edf\u884c\u4e3a\u3002 \u5728EBPF\u7684\u751f\u6001\u7cfb\u7edf\u4e2d\uff0ceBPF_SYSPROCLISTFMTARGDATATYPEDATTYPEARG\u5b8f\u662f\u4e00\u4e2a\u91cd\u8981\u7684\u7ec4\u6210\u90e8\u5206\u3002\u8fd9\u4e2a\u5b8f\u5728\u5904\u7406\u7cfb\u7edf\u8c03\u7528\u7684\u53c2\u6570\u683c\u5f0f\u5316\u548c\u7c7b\u578b\u68c0\u67e5\u65b9\u9762\u626e\u6f14\u4e86\u91cd\u8981\u89d2\u8272\u3002\u901a\u8fc7\u4f7f\u7528\u8fd9\u4e2a\u5b8f\uff0c\u5f00\u53d1\u8005\u53ef\u4ee5\u786e\u4fdd\u4f20\u9012\u7ed9\u7cfb\u7edf\u8c03\u7528\u7684\u53c2\u6570\u7c7b\u578b\u6b63\u786e\uff0c\u4ece\u800c\u63d0\u9ad8\u7cfb\u7edf\u7684\u7a33\u5b9a\u6027\u548c\u5b89\u5168\u6027\u3002 \u4e8c\u3001eBPF_SYSPROCLISTFMTARGDATATYPEDATTYPEARG\u5b8f\u7684\u5b9a\u4e49\u548c\u529f\u80fd 1. \u5b8f\u7684\u5b9a\u4e49 eBPF_SYSPROCLISTFMTARGDATATYPEDATTYPEARG\u5b8f\u7684\u5b9a\u4e49\u5982\u4e0b\uff1a define eBPF_SYSPROCLISTFMTARGDATATYPEDATTYPEARG(fmt, type, arg) ({ typeof(arg) _arg = (arg); if (unlikely(!__builtin_types_compatible_p(typeof(_arg), type))) { bpf_trace_printk(“invalid argument type for ” fmt “ ); return -EINVAL; } _arg; }) \u8fd9\u4e2a\u5b8f\u63a5\u53d7\u4e09\u4e2a\u53c2\u6570\uff1a`fmt`\u3001`type`\u548c`arg`\u3002`fmt`\u662f\u4e00\u4e2a\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\uff0c\u7528\u4e8e\u6307\u5b9a\u9519\u8bef\u6d88\u606f\u7684\u8f93\u51fa\u683c\u5f0f\uff1b`type`\u662f\u671f\u671b\u7684\u53c2\u6570\u7c7b\u578b\uff1b`arg`\u662f\u5b9e\u9645\u4f20\u9012\u7ed9\u7cfb\u7edf\u8c03\u7528\u7684\u53c2\u6570\u3002 2. \u529f\u80fd\u6982\u8ff0 eBPF_SYSPROCLISTFMTARGDATATYPEDATTYPEARG\u5b8f\u7684\u4e3b\u8981\u529f\u80fd\u662f\u8fdb\u884c\u53c2\u6570\u7c7b\u578b\u68c0\u67e5\u548c\u683c\u5f0f\u5316\u3002\u5728\u5b8f\u5185\u90e8\uff0c\u5b83\u9996\u5148\u4f7f\u7528`typeof`\u64cd\u4f5c\u7b26\u83b7\u53d6\u5b9e\u9645\u53c2\u6570`arg`\u7684\u7c7b\u578b\uff0c\u7136\u540e\u4f7f\u7528`__builtin_types_compatible_p`\u5185\u5efa\u51fd\u6570\u6bd4\u8f83\u5b9e\u9645\u53c2\u6570\u7c7b\u578b\u548c\u671f\u671b\u53c2\u6570\u7c7b\u578b`type`\u3002\u5982\u679c\u7c7b\u578b\u4e0d\u5339\u914d\uff0c\u5b8f\u4f1a\u8f93\u51fa\u9519\u8bef\u6d88\u606f\u5e76\u8fd4\u56de-EINVAL\uff0c\u8868\u793a\u65e0\u6548\u7684\u53c2\u6570\u7c7b\u578b\u3002 \u8fd9\u6837\u7684\u8bbe\u8ba1\u786e\u4fdd\u4e86\u53ea\u6709\u5f53\u53c2\u6570\u7c7b\u578b\u6b63\u786e\u65f6\uff0c\u7cfb\u7edf\u8c03\u7528\u624d\u4f1a\u88ab\u6267\u884c\uff0c\u4ece\u800c\u589e\u5f3a\u4e86\u7cfb\u7edf\u7684\u7a33\u5b9a\u6027\u548c\u5b89\u5168\u6027\u3002\u901a\u8fc7\u4f7f\u7528\u683c\u5f0f\u5316\u5b57\u7b26\u4e32`fmt`\uff0c\u5b8f\u8fd8\u63d0\u4f9b\u4e86\u7075\u6d3b\u7684\u9519\u8bef\u6d88\u606f\u8f93\u51fa\uff0c\u65b9\u4fbf\u8c03\u8bd5\u548c\u9519\u8bef\u8ffd\u8e2a\u3002 \u4e09\u3001eBPF_SYSPROCLISTFMTARGDATATYPEDATTYPEARG\u5b8f\u5728Ebpf\u4e2d\u7684\u5e94\u7528 1. \u7cfb\u7edf\u8c03\u7528\u7684\u5b89\u5168\u5f3a\u5316 \u5728Ebpf\u4e2d\uff0ceBPF_SYSPROCLISTFMTARGDATATYPEDATTYPEARG\u5b8f\u88ab\u5e7f\u6cdb\u5e94\u7528\u4e8e\u7cfb\u7edf\u8c03\u7528\u7684\u5b89\u5168\u5f3a\u5316\u3002\u4f8b\u5982\uff0c\u8003\u8651\u5982\u4e0b\u7684\u7cfb\u7edf\u8c03\u7528\u5305\u88c5\u51fd\u6570\uff1a int my_syscall(int arg1, const char arg2) { \/\/ \u4f7f\u7528eBPF_SYSPROCLISTFMTARGDATATYPEDATTYPEARG\u5b8f\u8fdb\u884c\u53c2\u6570\u7c7b\u578b\u68c0\u67e5 […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-37817","post","type-post","status-publish","format-standard","hentry","category-discussion"],"_links":{"self":[{"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/posts\/37817","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=37817"}],"version-history":[{"count":1,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/posts\/37817\/revisions"}],"predecessor-version":[{"id":37819,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/posts\/37817\/revisions\/37819"}],"wp:attachment":[{"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/media?parent=37817"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/categories?post=37817"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yunshan.net\/blog\/wp-json\/wp\/v2\/tags?post=37817"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}