{"id":76708,"date":"2026-02-23T07:11:09","date_gmt":"2026-02-22T23:11:09","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/76708.html"},"modified":"2026-02-23T07:11:09","modified_gmt":"2026-02-22T23:11:09","slug":"%ef%bc%88%e5%ad%a6%e4%b9%a0%e7%ac%94%e8%ae%b0%ef%bc%892-2-%e6%95%b4%e6%95%b0%e8%a1%a8%e7%a4%ba%ef%bc%882-2-8-%e5%85%b3%e4%ba%8e%e6%9c%89%e7%ac%a6%e5%8f%b7%e6%95%b0%e4%b8%8e%e6%97%a0%e7%ac%a6%e5%8f%b7","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/76708.html","title":{"rendered":"\uff08\u5b66\u4e60\u7b14\u8bb0\uff092.2 \u6574\u6570\u8868\u793a\uff082.2.8 \u5173\u4e8e\u6709\u7b26\u53f7\u6570\u4e0e\u65e0\u7b26\u53f7\u6570\u7684\u5efa\u8bae\uff09"},"content":{"rendered":"<\/p>\n<h4>\u76ee\u5f55<\/h4>\n<ul>\n<li>\u7ebf\u7d22\u680f<\/li>\n<li>\u7b14\u8bb0\u680f<\/li>\n<li>\n<ul>\n<li>1. \u9690\u5f0f\u8f6c\u6362\u7684\u9677\u9631\u4e0e\u6838\u5fc3\u8b66\u544a<\/li>\n<li>2. \u7ec3\u4e60\u9898 2.25 &#xff08;\u6570\u7ec4\u6c42\u548c Bug&#xff09;<\/li>\n<li>\n<ul>\n<li>1&#xff09;Bug\u4ee3\u7801<\/li>\n<li>2&#xff09;\u9519\u8bef\u5206\u6790<\/li>\n<li>3&#xff09;\u4fee\u590d\u65b9\u6848<\/li>\n<\/ul>\n<\/li>\n<li>3. \u7ec3\u4e60\u9898 2.26 &#xff08;\u5b57\u7b26\u4e32\u6bd4\u8f83 Bug&#xff09;<\/li>\n<li>\n<ul>\n<li>1&#xff09;Bug\u4ee3\u7801<\/li>\n<li>2&#xff09;\u9519\u8bef\u5206\u6790<\/li>\n<li>3&#xff09;\u4fee\u590d\u65b9\u6848<\/li>\n<\/ul>\n<\/li>\n<li>4. \u771f\u5b9e\u6f0f\u6d1e\u5206\u6790&#xff1a;FreeBSD getpeername<\/li>\n<li>\n<ul>\n<li>1&#xff09;\u6f0f\u6d1e\u4ee3\u7801\u7b80\u5316<\/li>\n<li>2&#xff09;\u6f0f\u6d1e\u6210\u56e0<\/li>\n<li>3&#xff09;\u4fee\u590d\u65b9\u6cd5<\/li>\n<\/ul>\n<\/li>\n<li>5. \u6838\u5fc3\u5efa\u8bae\u4e0e\u5408\u7406\u4f7f\u7528\u573a\u666f<\/li>\n<li>\n<ul>\n<li>1&#xff09;\u6838\u5fc3\u5efa\u8bae&#xff08;\u9ec4\u91d1\u6cd5\u5219&#xff09;<\/li>\n<li>2&#xff09;\u5408\u7406\u4e14\u6709\u76ca\u7684\u7279\u5b9a\u573a\u666f<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>\u603b\u7ed3\u680f<\/li>\n<\/ul>\n<hr \/>\n<h2>\u7ebf\u7d22\u680f<\/h2>\n<li>\u4e3a\u4ec0\u4e48\u8bf4\u4ece\u6709\u7b26\u53f7\u6570\u5230\u65e0\u7b26\u53f7\u6570\u7684\u9690\u5f0f\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\u662f\u5371\u9669\u7684&#xff1f;<\/li>\n<li>\u7ec3\u4e60\u9898 2.25\u200b \u4e2d&#xff0c;\u5f53 length &#061; 0\u65f6&#xff0c;\u5faa\u73af for (i &#061;0; i &lt;&#061; length-1; i&#043;&#043;)\u4e3a\u4ec0\u4e48\u4f1a\u5bfc\u81f4\u5185\u5b58\u9519\u8bef&#xff1f;<\/li>\n<li>\u7ec3\u4e60\u9898 2.26\u200b \u4e2d&#xff0c;\u51fd\u6570strlonger\u7684bug\u662f\u4ec0\u4e48&#xff1f;\u5728\u4ec0\u4e48\u6761\u4ef6\u4e0b\u4f1a\u4ea7\u751f\u9519\u8bef\u7ed3\u679c&#xff1f;<\/li>\n<li>FreeBSDgetpeername\u51fd\u6570\u6f0f\u6d1e\u7684\u6839\u672c\u539f\u56e0\u662f\u4ec0\u4e48&#xff1f;\u5b83\u4e0e\u6570\u636e\u7c7b\u578b\u4e0d\u5339\u914d\u6709\u4f55\u5173\u8054&#xff1f;<\/li>\n<li>\u4e3a\u4e86\u907f\u514d\u6b64\u7c7b\u9519\u8bef&#xff0c;\u5173\u4e8e\u4f7f\u7528\u65e0\u7b26\u53f7\u6570\u7684\u6838\u5fc3\u5efa\u8bae\u662f\u4ec0\u4e48&#xff1f;<\/li>\n<li>\u5728\u54ea\u4e9b\u7279\u5b9a\u573a\u666f\u4e0b&#xff0c;\u4f7f\u7528\u65e0\u7b26\u53f7\u6570\u662f\u5408\u7406\u4e14\u6709\u76ca\u7684&#xff1f;<\/li>\n<hr \/>\n<h2>\u7b14\u8bb0\u680f<\/h2>\n<h3>1. \u9690\u5f0f\u8f6c\u6362\u7684\u9677\u9631\u4e0e\u6838\u5fc3\u8b66\u544a<\/h3>\n<p>&#xff08;1&#xff09;\u6838\u5fc3\u8b66\u544a&#xff1a;C\u8bed\u8a00\u4e2d&#xff0c;\u4ece\u6709\u7b26\u53f7\u6570\u5230\u65e0\u7b26\u53f7\u6570\u7684\u9690\u5f0f\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\u662f\u8bb8\u591a\u975e\u76f4\u89c2\u884c\u4e3a\u548c\u7a0b\u5e8f\u9519\u8bef\u7684\u6839\u6e90\u3002\u7531\u4e8e\u8f6c\u6362\u6084\u65e0\u58f0\u606f\u5730\u53d1\u751f&#xff0c;\u7a0b\u5e8f\u5458\u6781\u6613\u5ffd\u89c6\u5176\u5f71\u54cd&#xff0c;\u5bfc\u81f4\u96be\u4ee5\u53d1\u73b0\u7684\u7ec6\u5fae\u9519\u8bef\u3002 &#xff08;2&#xff09;\u539f\u7406&#xff1a;\u5f53\u6709\u7b26\u53f7\u6570\u548c\u65e0\u7b26\u53f7\u6570\u5728\u8868\u8fbe\u5f0f\u4e2d\u6df7\u5408\u8fd0\u7b97\u65f6&#xff0c;C\u8bed\u8a00\u4f1a\u5c06\u6709\u7b26\u53f7\u6570\u9690\u5f0f\u5730\u8f6c\u6362\u4e3a\u65e0\u7b26\u53f7\u6570&#xff0c;\u7136\u540e\u6309\u65e0\u7b26\u53f7\u89c4\u5219\u8fdb\u884c\u8fd0\u7b97\u3002\u8fd9\u4f1a\u5bfc\u81f4\u8d1f\u6570\u88ab\u89e3\u91ca\u4e3a\u6781\u5927\u7684\u6b63\u6570&#xff0c;\u5f7b\u5e95\u6539\u53d8\u6bd4\u8f83\u548c\u7b97\u672f\u8fd0\u7b97\u7684\u903b\u8f91\u3002<\/p>\n<h3>2. \u7ec3\u4e60\u9898 2.25 &#xff08;\u6570\u7ec4\u6c42\u548c Bug&#xff09;<\/h3>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260222231105-699b8d093b670.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h4>1&#xff09;Bug\u4ee3\u7801<\/h4>\n<p><span class=\"token keyword\">float<\/span> <span class=\"token function\">sum_elements<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">float<\/span> a<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> length<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> i<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">float<\/span> result <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span>i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;&#061;<\/span> length <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        result <span class=\"token operator\">&#043;&#061;<\/span> a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> result<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>2&#xff09;\u9519\u8bef\u5206\u6790<\/h4>\n<p>&#xff08;1&#xff09;\u5f53 length &#061; 0\u65f6&#xff0c;\u8868\u8fbe\u5f0f length &#8211; 1\u7684\u7ed3\u679c\u5e94\u4e3a -1\u3002 &#xff08;2&#xff09;\u4f46\u7531\u4e8e length\u662f unsigned\u7c7b\u578b&#xff0c;\u6574\u4e2a\u8868\u8fbe\u5f0f\u4f1a\u8fdb\u884c\u65e0\u7b26\u53f7\u8fd0\u7b97&#xff1a;0U &#8211; 1U\u3002 &#xff08;3&#xff09;\u5728\u65e0\u7b26\u53f7\u6a21\u8fd0\u7b97\u4e0b&#xff0c;0U &#8211; 1U\u7684\u7ed3\u679c\u5e76\u975e -1&#xff0c;\u800c\u662f\u901a\u8fc7\u4e0b\u6ea2\u5f97\u5230\u6700\u5927\u503c\u200b UMax&#xff08;\u5bf9\u4e8e32\u4f4d\u662f4294967295&#xff09;\u3002 &#xff08;4&#xff09;\u5faa\u73af\u6761\u4ef6 i &lt;&#061; UMax\u6052\u6210\u7acb&#xff0c;\u5bfc\u81f4\u7a0b\u5e8f\u8bd5\u56fe\u8bbf\u95ee\u6570\u7ec4 a\u7684\u975e\u6cd5\u5185\u5b58&#xff08;a[0]&#xff0c; a[1]&#xff0c; \u2026&#xff09;&#xff0c;\u6700\u7ec8\u5f15\u53d1\u5185\u5b58\u9519\u8bef\u3002<\/p>\n<h4>3&#xff09;\u4fee\u590d\u65b9\u6848<\/h4>\n<p>&#xff08;1&#xff09;\u6700\u4f73\u65b9\u6848&#xff1a;\u5c06\u5faa\u73af\u6761\u4ef6\u6539\u4e3a i &lt; length\u3002\u8fd9\u662f\u6700\u5e38\u89c1\u4e14\u5b89\u5168\u7684\u5199\u6cd5\u3002 &#xff08;2&#xff09;\u6b21\u9009\u65b9\u6848&#xff1a;\u5c06\u53c2\u6570 length\u7684\u7c7b\u578b\u6539\u4e3a int\u3002\u4f46\u4f1a\u6539\u53d8\u51fd\u6570\u63a5\u53e3\u3002 <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260222231106-699b8d0a262e9.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h3>3. \u7ec3\u4e60\u9898 2.26 &#xff08;\u5b57\u7b26\u4e32\u6bd4\u8f83 Bug&#xff09;<\/h3>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260222231106-699b8d0a9f88d.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h4>1&#xff09;Bug\u4ee3\u7801<\/h4>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">strlonger<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>s<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>t<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span>s<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> <span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span>t<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>2&#xff09;\u9519\u8bef\u5206\u6790<\/h4>\n<p>&#xff08;1&#xff09;strlen\u7684\u8fd4\u56de\u7c7b\u578b\u662f size_t&#xff08;\u5728\u6807\u51c6\u5e93\u4e2d\u901a\u5e38\u5b9a\u4e49\u4e3a unsigned int\u6216 unsigned long&#xff09;\u3002 &#xff08;2&#xff09;\u5f53 strlen(s) &lt; strlen(t)\u65f6&#xff0c;\u8868\u8fbe\u5f0f strlen(s) &#8211; strlen(t)\u4f1a\u8fdb\u884c\u65e0\u7b26\u53f7\u51cf\u6cd5&#xff0c;\u7ed3\u679c\u662f\u4e0b\u6ea2\u540e\u7684\u5927\u6b63\u6570&#xff0c;\u5bfc\u81f4\u6bd4\u8f83 &gt; 0\u6052\u4e3a\u771f&#xff0c;\u51fd\u6570\u9519\u8bef\u5730\u8fd4\u56de 1&#xff08;\u8868\u793as\u66f4\u957f&#xff09;\u3002<\/p>\n<h4>3&#xff09;\u4fee\u590d\u65b9\u6848<\/h4>\n<p>&#xff08;1&#xff09;\u76f4\u63a5\u6bd4\u8f83\u957f\u5ea6&#xff0c;\u907f\u514d\u505a\u5dee&#xff1a;return strlen(s) &gt; strlen(t); &#xff08;2&#xff09;\u8fd9\u662f\u5b89\u5168\u53ef\u9760\u4e14\u610f\u56fe\u6e05\u6670\u7684\u505a\u6cd5\u3002 <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260222231107-699b8d0b6af86.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h3>4. \u771f\u5b9e\u6f0f\u6d1e\u5206\u6790&#xff1a;FreeBSD getpeername<\/h3>\n<h4>1&#xff09;\u6f0f\u6d1e\u4ee3\u7801\u7b80\u5316<\/h4>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">KSIZE<\/span> <span class=\"token expression\"><span class=\"token number\">1024<\/span><\/span><\/span><br \/>\n<span class=\"token keyword\">char<\/span> kbuf<span class=\"token punctuation\">[<\/span>KSIZE<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">copy_from_kernel<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>user_dest<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> maxlen<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token comment\">\/\/ maxlen \u4e3a\u6709\u7b26\u53f7 int<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> len <span class=\"token operator\">&#061;<\/span> KSIZE <span class=\"token operator\">&lt;<\/span> maxlen <span class=\"token operator\">?<\/span> KSIZE <span class=\"token operator\">:<\/span> maxlen<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">memcpy<\/span><span class=\"token punctuation\">(<\/span>user_dest<span class=\"token punctuation\">,<\/span> kbuf<span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ memcpy\u7684\u7b2c\u4e09\u4e2a\u53c2\u6570 n \u662f\u65e0\u7b26\u53f7 size_t<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> len<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>2&#xff09;\u6f0f\u6d1e\u6210\u56e0<\/h4>\n<p>&#xff08;1&#xff09;\u6570\u636e\u7c7b\u578b\u4e0d\u5339\u914d&#xff1a;\u51fd\u6570\u53c2\u6570 maxlen\u4e3a\u6709\u7b26\u53f7 int&#xff0c;\u4f46\u5e93\u51fd\u6570 memcpy\u7684\u7b2c\u4e09\u4e2a\u53c2\u6570 n\u662f\u65e0\u7b26\u53f7 size_t\u3002 &#xff08;2&#xff09;\u6076\u610f\u53c2\u6570\u89e6\u53d1&#xff1a;\u653b\u51fb\u8005\u4f20\u5165\u4e00\u4e2a\u8d1f\u503c&#xff08;\u5982 -1&#xff09;\u7ed9 maxlen\u3002 &#xff08;3&#xff09;\u9690\u5f0f\u8f6c\u6362\u4e0e\u4e0b\u6ea2&#xff1a;\u5728\u7b2c16\u884c&#xff0c;\u8d1f\u7684 maxlen\u4e0e KSIZE(1024) \u6bd4\u8f83\u65f6&#xff0c;\u4f1a\u5148\u88ab\u9690\u5f0f\u8f6c\u6362\u4e3a\u65e0\u7b26\u53f7\u6570&#xff0c;\u53d8\u6210\u4e00\u4e2a\u6781\u5927\u7684\u6b63\u6570&#xff08;\u63a5\u8fd1 UMax&#xff09;\u3002\u56e0\u6b64 len\u88ab\u8d4b\u503c\u4e3a\u8fd9\u4e2a\u6781\u5927\u503c\u3002 &#xff08;4&#xff09;\u6ea2\u51fa\u6267\u884c&#xff1a;\u8fd9\u4e2a\u6781\u5927\u7684 len\u4f5c\u4e3a size_t\u4f20\u9012\u7ed9 memcpy&#xff0c;\u5bfc\u81f4\u51fd\u6570\u5c1d\u8bd5\u590d\u5236\u6d77\u91cf\u6570\u636e&#xff08;\u8fdc\u8d85\u76ee\u6807\u7f13\u51b2\u533a\u5927\u5c0f&#xff09;&#xff0c;\u53ef\u80fd\u8bfb\u53d6\u672a\u6388\u6743\u7684\u5185\u6838\u5185\u5b58&#xff0c;\u9020\u6210\u4fe1\u606f\u6cc4\u9732\u3002<\/p>\n<h4>3&#xff09;\u4fee\u590d\u65b9\u6cd5<\/h4>\n<p>\u7edf\u4e00\u7c7b\u578b&#xff0c;\u6d88\u9664\u4e0d\u5339\u914d&#xff1a;\u5c06 copy_from_kernel\u7684\u53c2\u6570 maxlen\u3001\u5c40\u90e8\u53d8\u91cf len\u548c\u8fd4\u56de\u503c\u7c7b\u578b\u90fd\u6539\u4e3a size_t\u3002<\/p>\n<h3>5. \u6838\u5fc3\u5efa\u8bae\u4e0e\u5408\u7406\u4f7f\u7528\u573a\u666f<\/h3>\n<h4>1&#xff09;\u6838\u5fc3\u5efa\u8bae&#xff08;\u9ec4\u91d1\u6cd5\u5219&#xff09;<\/h4>\n<p>\u9664\u975e\u5728\u5fc5\u8981\u4e14\u80fd\u6e05\u6670\u638c\u63a7\u7684\u573a\u666f\u4e0b&#xff0c;\u5426\u5219\u5c3d\u91cf\u907f\u514d\u4f7f\u7528\u65e0\u7b26\u53f7\u6570\u3002\u200b \u8bb8\u591a\u73b0\u4ee3\u8bed\u8a00&#xff08;\u5982 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