{"id":2586,"date":"2024-08-14T00:10:00","date_gmt":"2024-08-13T16:10:00","guid":{"rendered":"https:\/\/systw.net\/note\/?p=2586"},"modified":"2025-08-14T11:20:38","modified_gmt":"2025-08-14T03:20:38","slug":"sc-unchecked-external-calls","status":"publish","type":"post","link":"https:\/\/systw.net\/note\/archives\/2586","title":{"rendered":"SC Unchecked External Calls"},"content":{"rendered":"\n

\u672a\u6aa2\u67e5\u7684\u5916\u90e8\u8abf\u7528\uff08Unchecked External Calls\uff09\u662f\u4e00\u7a2e\u5b89\u5168\u6f0f\u6d1e\uff0c\u6307\u5408\u7d04\u5728\u5c0d\u53e6\u4e00\u500b\u5408\u7d04\u6216\u5730\u5740\u9032\u884c\u5916\u90e8\u8abf\u7528\u6642\uff0c\u672a\u6b63\u78ba\u6aa2\u67e5\u8abf\u7528\u7684\u7d50\u679c\u3002\u5728\u4ee5\u592a\u574a\u4e2d\uff0c\u7576\u4e00\u500b\u5408\u7d04\u8abf\u7528\u53e6\u4e00\u500b\u5408\u7d04\u6642\uff0c\u88ab\u8abf\u7528\u7684\u5408\u7d04\u53ef\u80fd\u6703\u975c\u9ed8\u5931\u6557\u800c\u4e0d\u62cb\u51fa\u7570\u5e38\u3002\u5982\u679c\u8abf\u7528\u5408\u7d04\u672a\u6aa2\u67e5\u8fd4\u56de\u503c\u7684\u8a71\uff0c\u53ef\u80fd\u6703\u932f\u8aa4\u5730\u5047\u8a2d\u8abf\u7528\u6210\u529f\uff0c\u5373\u4f7f\u5be6\u969b\u4e0a\u4e26\u975e\u5982\u6b64\u3002\u9019\u53ef\u80fd\u5c0e\u81f4\u5408\u7d04\u72c0\u614b\u4e0d\u4e00\u81f4\uff0c\u4e26\u6210\u70ba\u653b\u64ca\u8005\u53ef\u5229\u7528\u7684\u6f0f\u6d1e\u3002<\/p>\n\n\n\n

\u7bc4\u4f8b\uff08\u5b58\u5728\u6f0f\u6d1e\u7684\u5408\u7d04\uff09<\/h4>\n\n\n\n

\u4ee5\u4e0b\u662f\u4e00\u500b\u5b58\u5728\u672a\u6aa2\u67e5\u5916\u90e8\u8abf\u7528\u6f0f\u6d1e\u7684\u667a\u80fd\u5408\u7d04\u7bc4\u4f8b\uff1a<\/p>\n\n\n\n

\/\/ SPDX-License-Identifier: MIT\npragma solidity ^0.8.0;\n\ncontract Solidity_UncheckedExternalCall {\n    address public owner;\n\n    constructor() {\n        owner = msg.sender;\n    }\n\n    function forward(address callee, bytes memory _data) public {\n        callee.delegatecall(_data);<\/mark>\n    }\n}<\/code><\/pre>\n\n\n\n
\u6f0f\u6d1e\u5206\u6790<\/strong>\uff1a<\/p>\n\n\n\n
    \n
  • forward<\/code> \u51fd\u6578<\/strong>\uff1a\u8a72\u51fd\u6578\u4f7f\u7528 delegatecall<\/code> \u5c0d\u7528\u6236\u63d0\u4f9b\u7684\u5730\u5740 (callee<\/code>) \u9032\u884c\u8abf\u7528\uff0c\u4f46\u672a\u6aa2\u67e5\u8abf\u7528\u7684\u8fd4\u56de\u7d50\u679c\u3002<\/li>\n\n\n\n
  • \u554f\u984c<\/strong>\uff1a\n
      \n
    • \u5982\u679c delegatecall<\/code> \u5931\u6557\uff0c\u5408\u7d04\u4e0d\u6703\u5bdf\u89ba\uff0c\u4e26\u7e7c\u7e8c\u57f7\u884c\uff0c\u5c0e\u81f4\u72c0\u614b\u53ef\u80fd\u4e0d\u4e00\u81f4\u3002<\/li>\n\n\n\n
    • \u6b64\u5916\uff0c\u8a72\u51fd\u6578\u5141\u8a31\u4efb\u610f\u5730\u5740\u57f7\u884c\u4efb\u610f\u7a0b\u5f0f\u78bc\uff0c\u4e14\u672a\u9032\u884c\u9a57\u8b49\uff0c\u9019\u589e\u52a0\u4e86\u984d\u5916\u98a8\u96aa\uff08\u8a73\u898b\u6ce8\u610f\u4e8b\u9805\uff09\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n
      \u5f71\u97ff<\/h4>\n\n\n\n
      \u672a\u6aa2\u67e5\u7684\u5916\u90e8\u8abf\u7528\u53ef\u80fd\u5c0e\u81f4\u4ee5\u4e0b\u56b4\u91cd\u5f8c\u679c\uff1a<\/p>\n\n\n\n
        \n
      1. \u4ea4\u6613\u5931\u6557<\/strong>\uff1a\u9810\u671f\u64cd\u4f5c\u672a\u6210\u529f\u5b8c\u6210\uff0c\u4f46\u5408\u7d04\u7e7c\u7e8c\u57f7\u884c\uff0c\u9020\u6210\u8cc7\u91d1\u640d\u5931\u3002<\/li>\n\n\n\n
      2. \u72c0\u614b\u4e0d\u4e00\u81f4<\/strong>\uff1a\u5408\u7d04\u5047\u8a2d\u8abf\u7528\u6210\u529f\uff0c\u5c0e\u81f4\u908f\u8f2f\u932f\u8aa4\uff0c\u4e26\u66b4\u9732\u66f4\u591a\u6f0f\u6d1e\u4f9b\u653b\u64ca\u8005\u5229\u7528\u3002<\/li>\n\n\n\n
      3. \u8cc7\u91d1\u640d\u5931\u8207\u9032\u4e00\u6b65\u653b\u64ca<\/strong>\uff1a\u653b\u64ca\u8005\u53ef\u80fd\u5229\u7528\u5931\u6557\u7684\u8abf\u7528\u4f86\u64cd\u63a7\u5408\u7d04\u72c0\u614b\uff0c\u7aca\u53d6\u8cc7\u91d1\u6216\u9020\u6210\u908f\u8f2f\u6df7\u4e82\u3002<\/li>\n<\/ol>\n\n\n\n
        \u4fee\u5fa9\u65b9\u6cd5<\/h4>\n\n\n\n
        \u70ba\u907f\u514d\u672a\u6aa2\u67e5\u7684\u5916\u90e8\u8abf\u7528\u6f0f\u6d1e\uff0c\u958b\u767c\u8005\u61c9\u63a1\u53d6\u4ee5\u4e0b\u63aa\u65bd\uff1a<\/p>\n\n\n\n
          \n
        1. \u512a\u5148\u4f7f\u7528 transfer()<\/code><\/strong>\uff1a\u4ee3\u66ff send()<\/code>\uff0c\u56e0\u70ba transfer()<\/code> \u5728\u5916\u90e8\u8abf\u7528\u5931\u6557\u6642\u6703\u81ea\u52d5\u56de\u6efe\u4ea4\u6613\u3002<\/li>\n\n\n\n
        2. \u6aa2\u67e5\u8fd4\u56de\u503c<\/strong>\uff1a\u5728\u4f7f\u7528 send()<\/code> \u6216 call()<\/code> \u7b49\u51fd\u6578\u6642\uff0c\u59cb\u7d42\u6aa2\u67e5\u8fd4\u56de\u7684\u5e03\u6797\u503c\uff08\u4f8b\u5982 bool success<\/code>\uff09\uff0c\u5982\u679c\u70ba false\uff0c\u5247\u8655\u7406\u932f\u8aa4\uff08\u5982\u4f7f\u7528 require<\/code> \u62cb\u51fa\u7570\u5e38\uff09\u3002<\/li>\n\n\n\n
        3. \u984d\u5916\u9a57\u8b49<\/strong>\uff1a\u5728\u8abf\u7528\u524d\u6aa2\u67e5\u88ab\u8abf\u7528\u5730\u5740\u7684\u6709\u6548\u6027\uff0c\u4f8b\u5982\u78ba\u4fdd\u5b83\u662f\u5408\u7d04\u5730\u5740\uff08\u7a0b\u5f0f\u78bc\u5927\u5c0f\u5927\u65bc\u96f6\uff09\u3002<\/li>\n<\/ol>\n\n\n\n
          \u4fee\u5fa9\u5f8c\u7684\u7bc4\u4f8b\u5408\u7d04<\/h4>\n\n\n\n
          \u4ee5\u4e0b\u662f\u4fee\u5fa9\u4e86\u672a\u6aa2\u67e5\u5916\u90e8\u8abf\u7528\u6f0f\u6d1e\u7684\u5408\u7d04\u7bc4\u4f8b\uff1a<\/p>\n\n\n\n
          \/\/ SPDX-License-Identifier: MIT\npragma solidity ^0.8.0; \n\ncontract Solidity_CheckedExternalCall {\n    address public owner;\n\n    constructor() {\n        owner = msg.sender;\n    }\n\n    function forward(address callee, bytes memory _data) public {\n        \/\/ Ensure that delegatecall succeeds\n        (bool success, ) = callee.delegatecall(_data);\n        require(success, \"Delegatecall failed\");  \/\/ Check the return value to handle failure<\/mark>\n    }\n}<\/code><\/pre>\n\n\n\n
          \u4fee\u5fa9\u5167\u5bb9<\/strong>\uff1a<\/p>\n\n\n\n
          1.\u6aa2\u67e5\u8fd4\u56de\u503c<\/strong>\uff1a<\/p>\n\n\n\n
            \n
          1. <\/li>\n<\/ol>\n\n\n\n
              \n
            • \u5728 forward<\/code> \u51fd\u6578\u4e2d\uff0c\u4f7f\u7528 (bool success, ) = callee.delegatecall(_data);<\/code> \u6355\u7372\u8fd4\u56de\u7d50\u679c\uff0c\u4e26\u4ee5 require(success)<\/code> \u78ba\u4fdd\u8abf\u7528\u6210\u529f\u3002<\/li>\n\n\n\n
            • \u5982\u679c\u8abf\u7528\u5931\u6557\uff0c\u4ea4\u6613\u6703\u56de\u6efe\uff0c\u907f\u514d\u72c0\u614b\u4e0d\u4e00\u81f4\u3002<\/li>\n<\/ul>\n\n\n\n
              2.\u5b89\u5168\u6027\u63d0\u5347<\/strong>\uff1a<\/p>\n\n\n\n
                \n
              1. <\/li>\n<\/ol>\n\n\n\n
                  \n
                • \u9019\u9632\u6b62\u4e86\u975c\u9ed8\u5931\u6557\uff0c\u4f46\u6ce8\u610f\u8a72\u5408\u7d04\u4ecd\u6709\u5176\u4ed6\u6f5b\u5728\u5f31\u9ede\uff08\u8a73\u898b\u6ce8\u610f\u4e8b\u9805\uff09\u3002<\/li>\n<\/ul>\n\n\n\n
                  \u6ce8\u610f\u4e8b\u9805 (Caveats)<\/h4>\n\n\n\n
                  \u4e0a\u8ff0\u5169\u500b\u5408\u7d04\u9664\u4e86\u672a\u6aa2\u67e5\u8fd4\u56de\u503c\u5916\uff0c\u9084\u5b58\u5728\u5176\u4ed6\u5f31\u9ede\uff1a<\/p>\n\n\n\n
                    \n
                  1. \u6388\u6b0a\u59d4\u8a17\u7d66\u88ab\u8abf\u7528\u8005<\/strong>\uff1a\u9a57\u8b49\u908f\u8f2f\u59d4\u8a17\u7d66\u88ab\u8abf\u7528\u7684\u5408\u7d04 (callee<\/code>)\uff0c\u8a72\u5408\u7d04\u53ef\u80fd\u672a\u9650\u5236 msg.sender<\/code>\uff08\u4f8b\u5982\uff0c\u6aa2\u67e5\u662f\u5426\u70ba owner<\/code>\uff09\u3002\u901a\u5e38\uff0cforward<\/code> \u51fd\u6578\u61c9\u81ea\u884c\u9032\u884c\u67d0\u7a2e\u5f62\u5f0f\u7684\u9a57\u8b49\u3002<\/li>\n\n\n\n
                  2. \u7528\u6236\u63d0\u4f9b\u7684\u5730\u5740 (callee<\/code>)<\/strong>\uff1a\u9019\u5141\u8a31\u7528\u6236\u63d0\u4f9b\u4efb\u610f\u5730\u5740\uff0c\u5c0e\u81f4\u5728\u7576\u524d\u5408\u7d04\u4e0a\u4e0b\u6587\u4e2d\u57f7\u884c\u4efb\u610f\u7a0b\u5f0f\u78bc\uff0c\u53ef\u80fd\u4fee\u6539\u5982 owner<\/code> \u7b49\u8b8a\u6578\u3002\u9019\u7279\u5225\u5371\u96aa\uff0c\u56e0\u70ba forward<\/code> \u672a\u9032\u884c\u9a57\u8b49\u3002<\/li>\n\n\n\n
                  3. \u672a\u6aa2\u67e5\u5730\u5740\u662f\u5426\u70ba\u5408\u7d04<\/strong>\uff1a\u5982\u679c callee<\/code> \u662f\u6c92\u6709\u7a0b\u5f0f\u78bc\u7684\u5730\u5740\uff0cdelegatecall<\/code> \u6703\u975c\u9ed8\u6210\u529f\u4f46\u7121\u6548\u3002\u901a\u5e38\uff0cforward<\/code> \u61c9\u9032\u884c\u57fa\u672c\u6aa2\u67e5\uff0c\u4f8b\u5982\u9a57\u8b49\u88ab\u8abf\u7528\u5408\u7d04\u7684\u7a0b\u5f0f\u78bc\u5927\u5c0f\u5927\u65bc\u96f6\uff08\u4f7f\u7528 extcodesize<\/code>\uff09\u3002<\/li>\n<\/ol>\n\n\n\n
                    \u9019\u4e9b\u6ce8\u610f\u4e8b\u9805\u5f37\u8abf\uff0c\u50c5\u6aa2\u67e5\u8fd4\u56de\u503c\u4e0d\u8db3\u4ee5\u5b8c\u5168\u5b89\u5168\uff1b\u9700\u7d50\u5408\u5176\u4ed6\u9632\u8b77\u63aa\u65bd\uff0c\u5982\u6b0a\u9650\u63a7\u5236\u548c\u8f38\u5165\u9a57\u8b49\u3002<\/p>\n\n\n\n
                    \u7e3d\u7d50<\/h4>\n\n\n\n
                    \u672a\u6aa2\u67e5\u7684\u5916\u90e8\u8abf\u7528\u662f\u667a\u80fd\u5408\u7d04\u4e2d\u5e38\u898b\u7684\u6f0f\u6d1e\uff0c\u53ef\u80fd\u5c0e\u81f4\u4ea4\u6613\u5931\u6557\u3001\u72c0\u614b\u4e0d\u4e00\u81f4\u548c\u8cc7\u91d1\u640d\u5931\u3002\u900f\u904e\u6aa2\u67e5\u8fd4\u56de\u503c\u3001\u4f7f\u7528\u5b89\u5168\u7684\u8f49\u5e33\u65b9\u6cd5\uff08\u5982 transfer()<\/code>\uff09\u4ee5\u53ca\u984d\u5916\u9a57\u8b49\u88ab\u8abf\u7528\u5730\u5740\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u6709\u6548\u4fee\u5fa9\u6b64\u554f\u984c\u3002\u7136\u800c\uff0c\u5982\u6ce8\u610f\u4e8b\u9805\u6240\u8ff0\uff0c\u5408\u7d04\u8a2d\u8a08\u9700\u5168\u9762\u8003\u616e\u591a\u5c64\u5b89\u5168\uff0c\u5305\u62ec\u6388\u6b0a\u548c\u8f38\u5165\u6aa2\u67e5\uff0c\u4ee5\u907f\u514d\u66f4\u5ee3\u6cdb\u7684\u6f0f\u6d1e\u3002\u4fee\u5fa9\u5f8c\u7684\u5408\u7d04\u5c55\u793a\u4e86\u5982\u4f55\u901a\u904e\u8fd4\u56de\u503c\u6aa2\u67e5\u4f86\u63d0\u5347\u5b89\u5168\u6027\uff0c\u4f46\u958b\u767c\u6642\u4ecd\u9700\u5168\u9762\u5be9\u8a08\u3002<\/p>\n\n\n\n
                    <\/p>\n","protected":false},"excerpt":{"rendered":"
                    \u672a\u6aa2\u67e5\u7684\u5916\u90e8\u8abf\u7528\uff08Unchecked External Ca …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"","fifu_image_alt":"","_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"enabled":false},"version":2}},"categories":[371],"tags":[],"class_list":["post-2586","post","type-post","status-publish","format-standard","hentry","category-web3-security"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/posts\/2586","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/comments?post=2586"}],"version-history":[{"count":2,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/posts\/2586\/revisions"}],"predecessor-version":[{"id":2610,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/posts\/2586\/revisions\/2610"}],"wp:attachment":[{"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/media?parent=2586"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/categories?post=2586"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/tags?post=2586"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}