{"id":7590,"date":"2024-07-16T23:34:04","date_gmt":"2024-07-16T15:34:04","guid":{"rendered":"https:\/\/www.wangonc.com\/?p=7590"},"modified":"2024-07-16T23:40:31","modified_gmt":"2024-07-16T15:40:31","slug":"compiling-android-binaries-and-inline-assembly","status":"publish","type":"post","link":"https:\/\/www.wangonc.com\/index.php\/2024\/07\/16\/compiling-android-binaries-and-inline-assembly\/","title":{"rendered":"\u7f16\u8bd1\u9002\u7528\u4e8eAndroid\u7684\u4e8c\u8fdb\u5236\u6587\u4ef6\u4ee5\u53ca\u5185\u8054\u6c47\u7f16"},"content":{"rendered":"

\u524d\u8a00<\/h2>\n

\u6ca1\u5565\u7075\u611f\uff0c\u7eaf\u5c5e\u7a81\u7136\u60f3\u5230\u4e86\u3002\u7136\u540e\u778e\u6298\u817e\uff0c\u987a\u4fbf\u5b66\u4e60<\/p>\n

\u7f16\u8bd1\u4e8c\u8fdb\u5236\u6587\u4ef6<\/h2>\n

\u8fd9\u91cc\u7f16\u8bd1Android\u7ec8\u7aef\u53ef\u4ee5\u4f7f\u7528\u7684\u4e8c\u8fdb\u5236\u6587\u4ef6\u9700\u8981\u7528\u5230ndk\uff0c\u5176\u5de5\u5177\u94fe\u63d0\u4f9b\u4e86\u76f8\u5f53\u5b8c\u6574\u7684\u8de8\u5e73\u53f0\u4ea4\u53c9\u7f16\u8bd1\u652f\u6301\u3002<\/p>\n

\u8fd9\u91cc\u4ee5Windows\u4e0b\u4e3a\u4f8b\uff0c\u5176\u4e00\u822c\u4f4d\u4e8eAndroidSDK\u76ee\u5f55\\ndk\\26.1.10909125\\toolchains\\llvm\\prebuilt\\windows-x86_64\\bin<\/code>\u4e2d<\/p>\n

\u4e0b\u9762\u7f16\u5199\u4e00\u4e2a\u7b80\u5355\u7684hello world<\/p>\n

#include<iostream>\nusing namespace std;\n\nint main()\n{\n    cout<< "hello world";\n    return 0;\n}<\/code><\/pre>\n
\u4f7f\u7528\u5176\u4e2d\u7684clang++\u8fdb\u884c\u7f16\u8bd1(\u8def\u5f84\u5747\u5df2\u7701\u7565)<\/p>\n
.\\clang++.exe -target aarch64-linux-android30 -static .\\Untitled-1.cpp -o .\\helloworldTest<\/code><\/pre>\n
\u4e0a\u8ff0\u547d\u4ee4\u4e2d\uff0c\u53c2\u6570\u542b\u4e49\u5982\u4e0b
\n-target \u7528\u4e8e\u6307\u5b9a\u76ee\u6807\u5e73\u53f0\uff0caarch64-linux-android30\u5373\u5b89\u5353\u5e73\u53f0\uff0capi\u4e3a30\u7684\u7248\u672c
\n-static \u610f\u5473\u7740\u9759\u6001\u8fde\u63a5\uff0c\u5bf9\u5e93\u5747\u8fdb\u884c\u9759\u6001\u94fe\u63a5\uff0c\u5728\u5b89\u5353\u7ec8\u7aef\u4e0b\u53ef\u4ee5\u907f\u514d\u4e00\u4e9b\u4f9d\u8d56\u95ee\u9898\uff08\u5f88\u663e\u7136hello world\u5e76\u6ca1\u6709\u8fd9\u79cd\u95ee\u9898\uff09
\n.\\Untitled-1.cpp \u4e3a\u8981\u7f16\u8bd1\u7684\u6e90\u4ee3\u7801\u8def\u5f84
\n-o \u5c31\u662f\u8f93\u51fa\u6587\u4ef6\u8def\u5f84<\/p>\n
\u8fd9\u91cc\u5982\u679c\u4ee3\u7801\u6ca1\u6709\u62a5\u9519\uff0c\u4f1a\u751f\u6210\u4e00\u4e2a\u540d\u4e3ahelloworldTest\u7684\u4e8c\u8fdb\u5236\u6587\u4ef6<\/p>\n
\u8fd9\u65f6\uff0c\u4f7f\u7528adb push\u653e\u8fdb\u8bbe\u5907\uff0c\u7136\u540echmod\u8d4b\u4e88\u6267\u884c\u6743\u9650\uff0c\u5373\u53ef\u5728\u7ec8\u7aef\u770b\u5230hello world\u7684\u8f93\u51fa\u3002
\n
\"file\"<\/div><\/p>\n
\u4f7f\u7528\u5185\u8054\u6c47\u7f16<\/h2>\n
\u5185\u8054\u6c47\u7f16\u5373\u5728c\/c++\u73af\u5883\u4e2d\u4f7f\u7528\u6c47\u7f16\u8bed\u8a00\u7684\u884c\u4e3a\u3002<\/p>\n
\u5185\u8054\u6c47\u7f16\u7684\u8bed\u6cd5\u548c\u7f16\u8bd1\u5668\u6709\u7ba1\uff0c\u4e0d\u540c\u7f16\u8bd1\u5668\u7684\u5185\u8054\u6c47\u7f16\u8bed\u6cd5\u662f\u4e0d\u4e00\u6837\u7684\u3002\u8fd9\u91cc\u4ee5\u4e0a\u6587\u4f7f\u7528\u7684clang++\u4e3a\u4f8b\uff0c\u5176\u8bed\u6cd5\u548cg++\u662f\u4e00\u6837\u7684\u3002<\/p>\n
\u4e0b\u9762\u7528\u5185\u8054\u6c47\u7f16\u7f16\u5199\u4e00\u4e2a\u6700\u7b80\u5355\u7684\u4e24\u6570\u76f8\u52a0\u51fd\u6570<\/p>\n
int add(int a,int b)\n{\n    int result;\n    asm volatile(\n        "add %w[a], %w[b], %w[result]"\n        : [result] "=r" (result)\n        : [a] "r" (a), [b] "r" (b)\n        : "memory"\n        );\n    return result;\n}<\/code><\/pre>\n
\u8be5\u51fd\u6570\u63a5\u6536\u4e24\u4e2a\u53c2\u6570\uff0c\u5e76\u8ba1\u7b97\u5176\u548c\uff0c\u653e\u7f6e\u4e8eresult\u4e2d\u5e76\u8fd4\u56de\u3002\u5728\u6c47\u7f16\u4e2d\u4e5f\u662f\u76f4\u63a5\u4f7f\u7528\u4e86add\u6307\u4ee4\u5b9e\u73b0\u52a0\u6cd5\u3002<\/p>\n
\u5176\u4e2dasm()\u5173\u952e\u5b57\u544a\u8bc9\u7f16\u8bd1\u5668\u4f7f\u7528\u7684\u662f\u5185\u8054\u6c47\u7f16
\nvolatile\u5219\u662f\u544a\u8bc9\u7f16\u8bd1\u5668\u4e0d\u8981\u4f18\u5316\u8fd9\u6bb5\u4ee3\u7801
\n\u6c47\u7f16\u6307\u4ee4\u4e2d\u7684%[a], %[b], %[result]\u5219\u662f\u5360\u4f4d\u7b26\uff0c\u4f1a\u88ab\u540e\u9762\u5b9a\u4e49\u7684\u64cd\u4f5c\u6570\u66ff\u6362<\/p>\n
\u5269\u4e0b\u7684\u90e8\u5206\u5219\u662f\u6269\u5c55\u5185\u8054\u6c47\u7f16\u90e8\u5206<\/p>\n
\u7b2c\u4e00\u884c: [result] "=r" (result)<\/code>\u5b9a\u4e49\u4e86\u8f93\u51fa\u64cd\u4f5c\u6570\uff08\u7528"=?"(var) \u7684\u5f62\u5f0f\u8868\u793a\uff09\u3002[result] \u662f\u4e00\u4e2a\u7b26\u53f7\u540d\uff0c\u7528\u4e8e\u66ff\u6362\u4e0a\u9762\u7684\u5360\u4f4d\u7b26,"=r" \u8868\u793a\u8fd9\u662f\u4e00\u4e2a\u8f93\u51fa\u5230\u901a\u7528\u5bc4\u5b58\u5668\u7684\u503c,(result) \u662f\u5bf9\u5e94\u7684 C \u53d8\u91cf\u3002\u5176\u4e2dr\u8868\u793a\u4f7f\u7528\u4efb\u610f\u901a\u7528\u5bc4\u5b58\u5668\u3002<\/p>\n
\n
\u9664\u4e86r\u4e4b\u5916\uff0c\u8fd8\u6709\u5982\u4e0b\u4ee3\u53f7\u7528\u4e8e\u8868\u793a\u5b58\u50a8\u65b9\u5f0f
\nm \u5185\u5b58
\ni \u7acb\u5373\u6570\uff08\u5e38\u91cf\uff0c\u53ea\u7528\u4e8e\u8f93\u5165\u64cd\u4f5c\u6570\uff09
\ng \u5bc4\u5b58\u5668\u3001\u5185\u5b58\u3001\u7acb\u5373\u6570 \u90fd\u884c<\/p>\n<\/blockquote>\n
\u7b2c\u4e8c\u884c: [a] "r" (a), [b] "r" (b)<\/code>\u5b9a\u4e49\u4e86\u8f93\u5165\u64cd\u4f5c\u6570\u3002[a] \u548c [b] \u662f\u7b26\u53f7\u540d,\u7528\u4e8e\u66ff\u6362\u5360\u4f4d\u7b26\u3002"r" \u8868\u793a\u8fd9\u4e9b\u503c\u5b58\u50a8\u5728\u901a\u7528\u5bc4\u5b58\u5668\u4e2d,(a) \u548c (b) \u662f\u5bf9\u5e94\u7684 C \u53d8\u91cf\u3002<\/p>\n
\u7b2c\u4e09\u884c\u7684: "memory"<\/code>\u8fd9\u544a\u8bc9\u7f16\u8bd1\u5668,\u5185\u5b58\u53ef\u80fd\u88ab\u8fd9\u6bb5\u4ee3\u7801\u4fee\u6539\u3002\u8fd9\u901a\u5e38\u7528\u4e8e\u786e\u4fdd\u7f16\u8bd1\u5668\u4e0d\u4f1a\u505a\u51fa\u53ef\u80fd\u5bfc\u81f4\u9519\u8bef\u7684\u4f18\u5316\u3002<\/p>\n
\u4e0b\u9762\u5199\u4e00\u6bb5\u5b8c\u6574\u7684\u4ee3\u7801\u7528\u4e8e\u6d4b\u8bd5<\/p>\n
#include<iostream>\nusing namespace std;\n\nint add(int a,int b)\n{\n    int result;\n    asm volatile(\n        "add %w[a], %w[b], %w[result]"\n        : [result] "=r" (result)\n        : [a] "r" (a), [b] "r" (b)\n        : "memory"\n        );\n    return result;\n}\n\nint main()\n{\n    cout<< add(1,2);\n    return 0;\n}<\/code><\/pre>\n
\u4f7f\u7528\u4e0a\u6587\u4e2d\u76f8\u540c\u7684\u64cd\u4f5c\u8fdb\u884c\u7f16\u8bd1\u8fd0\u884c\uff0c\u5373\u53ef\u5982\u4e0b\u8f93\u51fa,\u53ef\u4ee5\u770b\u5230\u6210\u529f\u8f93\u51fa\u4e86\u76f8\u52a0\u7ed3\u679c3\u3002
\n
\"file\"<\/div><\/p>\n
\u81ea\u4fee\u6539\u4ee3\u7801<\/h2>\n
\u65e2\u7136\u90fd\u7528\u5230\u5185\u8054\u6c47\u7f16\u4e86\uff0c\u5c31\u8981\u73a9\u4e00\u4e9b\u539f\u751f\u4ee3\u7801\u4e0d\u5bb9\u6613\u505a\u5230\u7684\u9a9a\u64cd\u4f5c\uff0c\u4f8b\u5982\u81ea\u4fee\u6539\u4ee3\u7801\uff08Self-Modified Code\uff09\u3002<\/p>\n
\u81ea\u4fee\u8be5\u4ee3\u7801\u987e\u540d\u601d\u4e49\uff0c\u5c31\u662f\u5728\u8fd0\u884c\u65f6\u4fee\u6539\u81ea\u8eab\u4ee3\u7801\u4f7f\u5176\u53cd\u6c47\u7f16\u7684\u5185\u5bb9\u4e0e\u5b9e\u9645\u6267\u884c\u7684\u5185\u5bb9\u4e0d\u4e00\u81f4\uff0c\u589e\u52a0\u9006\u5411\u96be\u5ea6\u3002<\/p>\n
\u5728\u4e0d\u9002\u7528\u5185\u8054\u6c47\u7f16\u7684\u60c5\u51b5\u4e0b\uff0c\u539f\u751f\u4ee3\u7801\u662f\u4e0d\u5bb9\u6613\u5b9e\u73b0\u7684\uff0c\u56e0\u4e3a\u539f\u751f\u4ee3\u7801\u505a\u4e0d\u5230\u4ece\u6c47\u7f16\u6307\u4ee4\u7684\u5c42\u9762\u7cbe\u51c6\u63a7\u5236\uff0c\u65e0\u6cd5\u9884\u4f30\u751f\u6210\u6307\u4ee4\u7684\u957f\u5ea6\u4ee5\u53ca\u4f4d\u7f6e\uff0c\u96be\u4ee5\u4fee\u6539\uff0c\u4e14\u5bb9\u6613\u4ea7\u751f\u65e0\u6cd5\u9884\u6599\u7684\u95ee\u9898\u3002<\/p>\n
\u6240\u4ee5\u53ef\u4ee5\u901a\u8fc7\u5185\u8054\u6c47\u7f16\u6765\u76f4\u63a5\u4f7f\u7528\u6c47\u7f16\u6307\u4ee4\u5b9e\u73b0\u9700\u8981\u88ab\u81ea\u4fee\u8be5\u7684\u4ee3\u7801\uff0c\u8fd9\u6837\u7f16\u8bd1\u751f\u6210\u7684\u4ee3\u7801\u957f\u5ea6\u548c\u4f4d\u7f6e\u90fd\u662f\u56fa\u5b9a\u7684\uff0c\u65b9\u4fbf\u5bf9\u5176\u8fdb\u884c\u4fee\u6539\u3002<\/p>\n
\u8fd9\u6b21\u7684\u76ee\u7684\u662f\u5b9e\u73b0\u4e00\u4e2a\u5728\u5185\u5b58\u4e2d\u8fdb\u884c\u81ea\u6211\u89e3\u5bc6\u7684\u51fd\u6570\uff0c\u7528\u4e8e\u6253\u5370hello world\u3002<\/p>\n
\u5b9e\u73b0\u539f\u751f\u4ee3\u7801<\/h3>\n
\u8fd9\u91cc\u4f5c\u4e3a\u6d4b\u8bd5\uff0c\u672c\u7740\u52a0\u5bc6\u7684\u4ee3\u7801\u548c\u5916\u90e8\u7684\u5173\u8054\u5c3d\u91cf\u5c11\u7684\u539f\u5219\uff0c\u9009\u62e9\u76f4\u63a5\u4f7f\u7528\u7cfb\u7edf\u8c03\u7528SYS_write\u5411stdout\u8f93\u51fa\u7684\u65b9\u5f0f\u5411\u7ec8\u7aef\u5199\u5165\u5185\u5bb9\u3002<\/p>\n
\u8fd9\u9996\u5148\u7528\u6c47\u7f16\u5b9e\u73b0\u4e00\u4e2a\u4f7f\u7528\u7cfb\u7edf\u8c03\u7528\u8f93\u51fa\u5185\u5bb9\u7684\u51fd\u6570\uff0c\u4ee3\u7801\u5982\u4e0b<\/p>\n
adr x1, 24\nmov x0, #1; STDOUT_FILENO\nmov x2, #14; len\nmov x8, #0x40; SYS_write\nsvc 0\nret\n.ascii "Hello, World!\\n"<\/code><\/pre>\n
\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0c\u4e3a\u4e86\u76f4\u63a5\u628a\u9700\u8981\u6253\u5370\u7684\u5b57\u7b26\u4e32\u5b9a\u4e49\u5728\u4e86\u51fd\u6570\u6700\u540e\uff08\u5f53\u7136\u76f4\u63a5\u5728\u4ee3\u7801\u6bb5\u5199\u6570\u636e\u8fd9\u79cd\u884c\u4e3a\u662f\u4e0d\u63a8\u8350\u7684\uff09\u3002
\n\u5e76\u4e14\u4e3a\u4e86\u51cf\u5c11\u7f16\u8bd1\u5668\u5bf9\u5730\u5740\u7684\u5e72\u9884\uff0c\u6ca1\u6709\u53ea\u7528\u6807\u7b7e\u548c\u4f2a\u6307\u4ee4\u7684\u65b9\u5f0f\u8bfb\u53d6\u5b57\u7b26\u4e32\uff0c\u76f4\u63a5\u4f7f\u7528\u4e86adr\u6839\u636e\u6307\u4ee4\u884c\u6570\u8df3\u8f6c\u5230\u5b57\u7b26\u4e32\u4f4d\u7f6e\uff0c\u8fd9\u6837\u53ef\u4ee5\u4fdd\u8bc1\u4ee3\u7801\u7684\u53ef\u79fb\u690d\u6027\u3002<\/p>\n
\n
\u6700\u597d\u662f\u5b9a\u4e49\u5728\u6700\u540e\uff0c\u4e5f\u5c31\u662fret\u540e\uff0c\u4e0d\u7136\u8fd8\u8981\u9632\u6b62\u5b57\u7b26\u4e32\u672c\u8eab\u88ab\u5f53\u6210\u4ee3\u7801\u6267\u884c\uff0c\u9700\u8981\u5904\u7406\u5730\u5740\u8df3\u8f6c\u7684\u95ee\u9898<\/p>\n<\/blockquote>\n
\u6700\u540e\u5957\u4e2a\u51fd\u6570\u5916\u58f3\u6267\u884c\u5373\u53ef\u3002<\/p>\n
\u5b8c\u6574\u7684\u4ee3\u7801\u5982\u4e0b<\/p>\n
void inlinePrintHello()\n{\n    asm volatile(\n        "adr x1, 24\\n\\t" \/\/ pc\u5411\u540e\u504f\u79fb24\uff0c6\u6761\u6307\u4ee4\n        "mov x0, #1\\n\\t"\n        "mov x2, #14\\n\\t"\n        "mov x8, #0x40\\n\\t"\n        "svc 0\\n\\t"\n        "ret\\n\\t"\n        ".ascii \\"Hello, World!\\\\n\\"\\n\\t"\n        :\n        :\n        : "memory"\n        );\n}\n\nint main()\n{\n    inlinePrintHello();\n    return 0;\n}<\/code><\/pre>\n
\u7f16\u8bd1\u540e\u53ef\u4ee5\u6b63\u5e38\u8f93\u51fahello world
\n
\"file\"<\/div><\/p>\n
\u52a0\u5bc6\u6307\u4ee4<\/h3>\n
\u8fd9\u91cc\u9700\u8981\u83b7\u53d6\u4e0a\u8ff0\u7f16\u8bd1\u540e\u7684\u4e8c\u8fdb\u5236\u6570\u636e\uff0c\u5bf9\u5176\u8fdb\u884c\u52a0\u5bc6\u3002<\/p>\n
\u628a\u4e0a\u9762\u7f16\u8bd1\u597d\u7684\u5185\u5bb9\u62d6\u8fdbida\uff0c\u627e\u5230\u5b9a\u4e49\u597d\u7684inlinePrintHello\u51fd\u6570<\/p>\n
\"file\"<\/div><\/p>\n
\u53ef\u4ee5\u770b\u5230\u51fd\u6570\u5185\u5bb9\u6ca1\u6709\u88ab\u4e1d\u6beb\u6539\u53d8\uff0c\u4e5f\u4e0d\u5305\u542b\u51fd\u6570\u4ee5\u5916\u7684\u76f8\u5bf9\u5730\u5740\u3002<\/p>\n
\u590d\u5236\u590d\u5236\u51fa\u51fd\u6570\u5b8c\u6574\u7684\u4e8c\u8fdb\u5236\u6570\u636e\uff08\u5305\u542bhello world\u5b57\u7b26\u4e32\uff09\uff0c\u53ef\u4ee5\u5f97\u5230
\n[0xC1, 0x00, 0x00, 0x10, 0x20, 0x00, 0x80, 0xD2, 0xC2, 0x01, 0x80, 0xD2, 0x08, 0x08, 0x80, 0xD2, 0x01, 0x00, 0x00, 0xD4, 0xC0, 0x03, 0x5F, 0xD6, 0x48, 0x65, 0x6C, 0x6C, 0x6F, 0x2C, 0x20, 0x57, 0x6F, 0x72, 0x6C, 0x64, 0x21, 0x0A]<\/code><\/p>\n
\u8fd9\u91cc\u65b9\u4fbf\u8d77\u89c1\u53ea\u662f\u7528\u7b80\u5355\u7684\u6291\u6216\u8fdb\u884c\u52a0\u5bc6\uff0c\u7f16\u5199\u4e00\u6bb5\u7b80\u5355\u7684python\u811a\u672c\u6765\u52a0\u5bc6<\/p>\n
def encryCode(code,key):\n    print(".byte",end=" ")\n    for i in code:\n        print(hex(i^key),end=",")\n    print("\\b ")\n\ncode = [0xC1, 0x00, 0x00, 0x10, 0x20, 0x00, 0x80, 0xD2, 0xC2, 0x01, 0x80, 0xD2, 0x08, 0x08, 0x80, 0xD2, 0x01, 0x00, 0x00, 0xD4, 0xC0, 0x03, 0x5F, 0xD6, 0x48, 0x65, 0x6C, 0x6C, 0x6F, 0x2C, 0x20, 0x57, 0x6F, 0x72, 0x6C, 0x64, 0x21, 0x0A]\n\nencryCode(code,0xff)<\/code><\/pre>\n
\"file\"<\/div><\/p>\n
\u8fd9\u91cc\u751f\u6210\u597d\u4e86\u52a0\u5bc6\u540e\u7684hello world\u6253\u5370\u51fd\u6570<\/p>\n
\u5b8c\u6210\u81ea\u4fee\u6539\u7a0b\u5e8f<\/h3>\n
\u56e0\u4e3a\u5728\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u7a0b\u5e8f\u7684\u4ee3\u7801\u6bb5\u662f\u53ea\u8bfb\u7684\uff0c\u4e0d\u5141\u8bb8\u88ab\u4fee\u6539\uff0c\u6240\u4ee5\u9700\u8981\u5148\u4fee\u6539\u5176\u8bfb\u5199\u6743\u9650\u3002<\/p>\n
\u8fd9\u91cc\u4f7f\u7528mprotect\u51fd\u6570\u5bf9\u5185\u5b58\u9875\u6743\u9650\u8fdb\u884c\u4fee\u6539\u3002\u5176\u51fd\u6570\u539f\u578b\u5982\u4e0b<\/p>\n
#include <sys\/mman.h>\n\/\/addr: \u8981\u4fee\u6539\u6743\u9650\u7684\u5185\u5b58\u533a\u57df\u7684\u8d77\u59cb\u5730\u5740\u3002\u8fd9\u4e2a\u5730\u5740\u5fc5\u987b\u662f\u9875\u7684\u8d77\u59cb\u5730\u5740\uff08\u901a\u5e38\u662f4KB\u7684\u500d\u6570\uff09\u3002\n\/\/len: \u8981\u4fee\u6539\u6743\u9650\u7684\u5185\u5b58\u533a\u57df\u7684\u957f\u5ea6\uff08\u4ee5\u5b57\u8282\u4e3a\u5355\u4f4d\uff09\u3002\n\/\/prot: \u65b0\u7684\u4fdd\u62a4\u6807\u5fd7\uff0c\u53ef\u4ee5\u662f\u4ee5\u4e0b\u503c\u7684\u6309\u4f4d\u6216\u7ec4\u5408\uff1a\n\/*PROT_NONE: \u8be5\u5185\u5b58\u533a\u57df\u4e0d\u53ef\u8bbf\u95ee\nPROT_READ: \u8be5\u5185\u5b58\u533a\u57df\u53ef\u8bfb\nPROT_WRITE: \u8be5\u5185\u5b58\u533a\u57df\u53ef\u5199\nPROT_EXEC: \u8be5\u5185\u5b58\u533a\u57df\u53ef\u6267\u884c*\/\nint mprotect(void *addr, size_t len, int prot);<\/code><\/pre>\n
\u6240\u4ee5\u9700\u8981\u5148\u8ba1\u7b97\u51fa\u51fd\u6570\u6240\u5728\u9875\u7684\u8d77\u59cb\u5730\u5740\u3002<\/p>\n
\u4f7f\u7528sysconf(_SC_PAGESIZE);<\/code>\u53ef\u4ee5\u83b7\u53d6\u5f53\u524d\u7684\u9875\u5927\u5c0f\uff0c\u4e00\u822c\u4e3a4096<\/p>\n
\u5047\u8bbe\u4e0a\u9762\u5b9a\u4e49\u7684\u52a0\u5bc6\u51fd\u6570\u5730\u5740\u662fcode\uff0c\u9875\u5927\u5c0f\u662fpageSize\uff0c\u5219\u5f53\u524d\u51fd\u6570\u6240\u5728\u9875\u8d77\u59cb\u5730\u5740\u5c31\u662fcode & ~(pagesize - 1)<\/code>
\npagesize - 1<\/code> \u521b\u5efa\u4e00\u4e2a\u63a9\u7801\uff0c\u5176\u4f4e\u4f4d\u5168\u4e3a1\uff0c\u9ad8\u4f4d\u5168\u4e3a0\u3002\u4f8b\u5982\uff0c\u5982\u679c pagesize \u662f 4096 (2^12)\uff0c\u5219 pagesize - 1<\/code> \u662f 4095\uff0c\u4e8c\u8fdb\u5236\u8868\u793a\u4e3a 0000111111111111.
\n~(pagesize - 1)<\/code> \u5bf9\u8fd9\u4e2a\u63a9\u7801\u53d6\u53cd\uff0c\u5f97\u5230\u4e00\u4e2a\u65b0\u7684\u63a9\u7801\uff0c\u5176\u4f4e\u4f4d\u5168\u4e3a0\uff0c\u9ad8\u4f4d\u5168\u4e3a1\u3002\u7ee7\u7eed\u4e0a\u9762\u7684\u4f8b\u5b50\uff0c\u7ed3\u679c\u5c06\u662f 1111000000000000\u3002
\n\u6240\u4ee5code & ~(pagesize - 1)<\/code> \u5c31\u662f\u5c06 code \u7684\u5730\u5740\u4e0e\u8fd9\u4e2a\u65b0\u63a9\u7801\u8fdb\u884c\u6309\u4f4d\u4e0e\u64cd\u4f5c\uff0c\u4e5f\u5c31\u662f\u5c06\u5176\u5730\u5740\u4f4e\u4f4d\u5168\u90e8\u7f6e0\u3002\u8fd9\u6709\u6548\u7684\u5c06\u5730\u5740\u5411\u4e0b\u820d\u5165\u5230\u6700\u63a5\u8fd1\u7684\u9875\u9762\u8fb9\u754c\u3002<\/p>\n
\u5bf9\u4e8e\u6743\u9650\uff0c\u8fd9\u91cc\u76f4\u63a5\u5c06\u5176\u8bbe\u5b9a\u4e3a\u53ef\u8bfb\u5199\u6267\u884c\uff0c\u5373PROT_READ | PROT_WRITE | PROT_EXEC<\/code><\/p>\n
\u6240\u4ee5\u8fd9\u91cc\u53ef\u4ee5\u7f16\u5199\u4ee3\u7801\u4e3a<\/p>\n
long pagesize = sysconf(_SC_PAGESIZE);\nmprotect((void *)((unsigned long)code & ~(pagesize - 1)), pagesize, PROT_READ | PROT_WRITE | PROT_EXEC)<\/code><\/pre>\n
\u7136\u540e\u5c06\u52a0\u5bc6\u7684\u51fd\u6570\u4f5c\u4e3a\u6570\u7ec4\uff0c\u5bf9\u5176\u6570\u503c\u8fdb\u884c\u6291\u6216<\/p>\n
for (int i = 0; i < 38; i++) {\n        code[i] ^= 0xff;\n    }<\/code><\/pre>\n
\u7531\u4e8e\u4e0a\u8ff0\u884c\u4e3a\u4fee\u6539\u4e86\u4ee3\u7801\u6bb5\u4e2d\u7684\u4ee3\u7801\uff0c\u6240\u4ee5\u9700\u8981\u6267\u884cvoid __builtin___clear_cache(char *begin, char *end);<\/code>\u51fd\u6570\u6765\u6e05\u9664\u6307\u4ee4\u7f13\u5b58\u3002\u5426\u5219\u53ef\u80fd\u4f1a\u56e0\u4e3a\u5185\u5b58\u4e2d\u4ee3\u7801\u548c\u5904\u7406\u5668\u7f13\u5b58\u4e2d\u4ee3\u7801\u4e0d\u4e00\u81f4\uff0c\u5bfc\u81f4\u6267\u884c\u51fa\u9519\u3002<\/p>\n
\u6700\u540e\u5728\u6267\u884c\u89e3\u5bc6\u5b8c\u6bd5\u7684\u51fd\u6570\u540e\uff0c\u6062\u590d\u9875\u6743\u9650\u5373\u53ef\u3002<\/p>\n
\u5b8c\u6574\u4ee3\u7801\u5982\u4e0b<\/p>\n
#include <sys\/mman.h>\n#include <unistd.h>\n#include <stdio.h>\n\nvoid hello()\n{\n    \/\/ \u52a0\u5bc6\u540e\u7684\u51fd\u6570\n    asm volatile(\n        ".byte 0x3e,0xff,0xff,0xef,0xdf,0xff,0x7f,0x2d,0x3d,0xfe,0x7f,0x2d,0xf7,0xf7,0x7f,0x2d,0xfe,0xff,0xff,0x2b,0x3f,0xfc,0xa0,0x29,0xb7,0x9a,0x93,0x93,0x90,0xd3,0xdf,0xa8,0x90,0x8d,0x93,0x9b,0xde,0xf5"\n    );\n}\n\nint main()\n{\n\n    char *code = (char *)hello;\n\n    \/\/ \u83b7\u53d6\u9875\u9762\u5927\u5c0f\n    long pagesize = sysconf(_SC_PAGESIZE);\n\n    \/\/ \u5c06\u5185\u5b58\u9875\u8bbe\u7f6e\u4e3a\u53ef\u5199\n    if (mprotect((void *)((unsigned long)code & ~(pagesize - 1)), pagesize, PROT_READ | PROT_WRITE | PROT_EXEC) != 0) {\n        perror("mprotect failed");\n        _exit(1);\n    }\n\n    \/\/ \u89e3\u5bc6\u4ee3\u7801\n    for (int i = 0; i < 38; i++) {\n        code[i] ^= 0xff;\n    }\n\n    \/\/ \u6e05\u9664\u6307\u4ee4\u7f13\u5b58,\u5982\u679c\u4e0d\u6267\u884c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u5904\u7406\u5668\u7f13\u5b58\u7ee7\u7eed\u6267\u884c\u89e3\u5bc6\u4e4b\u524d\u7684\u65e0\u6548\u6307\u4ee4\uff0c\u5bfc\u81f4\u5f02\u5e38\n    __builtin___clear_cache(code, (code + pagesize));\n\n    hello();\n\n    \/\/ \u5c06\u5185\u5b58\u9875\u6062\u590d\u4e3a\u53ea\u8bfb\u548c\u53ef\u6267\u884c\n    if (mprotect((void *)((unsigned long)code & ~(pagesize - 1)), pagesize, PROT_READ | PROT_EXEC) != 0) {\n        perror("mprotect failed");\n        _exit(1);\n    }\n\n    return 0;\n}<\/code><\/pre>\n
\u6267\u884c\u4ee3\u7801\u53ef\u4ee5\u770b\u5230\uff0c\u4f9d\u65e7\u6b63\u5e38\u8f93\u51fa\u4e86hello world\u3002
\n
\"file\"<\/div><\/p>\n
\u628a\u5176\u6258\u8fdbida\u4e2d\u8fdb\u884c\u5206\u6790\uff0c\u53ef\u4ee5\u770b\u5230hello\u51fd\u6570\u65e0\u6cd5\u88ab\u6b63\u5e38\u8bc6\u522b
\n
\"file\"<\/div><\/p>\n
\u53ea\u6709\u5728\u6267\u884c\u7684\u65f6\u5019\uff0c\u5185\u5b58\u4e2d\u624d\u6709\u51fd\u6570\u7684\u6b63\u5e38\u903b\u8f91
\n
\"file\"<\/div><\/p>\n","protected":false},"excerpt":{"rendered":"
\u524d\u8a00 \u6ca1\u5565\u7075\u611f\uff0c\u7eaf\u5c5e\u7a81\u7136\u60f3\u5230\u4e86\u3002\u7136\u540e\u778e\u6298\u817e\uff0c\u987a\u4fbf\u5b66\u4e60 \u7f16\u8bd1\u4e8c\u8fdb\u5236\u6587\u4ef6 \u8fd9\u91cc\u7f16\u8bd1Android\u7ec8\u7aef\u53ef\u4ee5\u4f7f\u7528\u7684\u4e8c\u8fdb […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9,11],"tags":[88,86,87],"series":[],"class_list":["post-7590","post","type-post","status-publish","format-standard","hentry","category-so-reverse-engineering","category-toss-record","tag-88","tag-86","tag-87"],"_links":{"self":[{"href":"https:\/\/www.wangonc.com\/index.php\/wp-json\/wp\/v2\/posts\/7590","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wangonc.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.wangonc.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.wangonc.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wangonc.com\/index.php\/wp-json\/wp\/v2\/comments?post=7590"}],"version-history":[{"count":5,"href":"https:\/\/www.wangonc.com\/index.php\/wp-json\/wp\/v2\/posts\/7590\/revisions"}],"predecessor-version":[{"id":7607,"href":"https:\/\/www.wangonc.com\/index.php\/wp-json\/wp\/v2\/posts\/7590\/revisions\/7607"}],"wp:attachment":[{"href":"https:\/\/www.wangonc.com\/index.php\/wp-json\/wp\/v2\/media?parent=7590"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.wangonc.com\/index.php\/wp-json\/wp\/v2\/categories?post=7590"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.wangonc.com\/index.php\/wp-json\/wp\/v2\/tags?post=7590"},{"taxonomy":"series","embeddable":true,"href":"https:\/\/www.wangonc.com\/index.php\/wp-json\/wp\/v2\/series?post=7590"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}