{"id":1241,"date":"2022-06-22T22:50:11","date_gmt":"2022-06-22T14:50:11","guid":{"rendered":"https:\/\/www.zhiwanyuzhou.com\/?p=1241"},"modified":"2022-09-11T19:33:04","modified_gmt":"2022-09-11T11:33:04","slug":"linux%e7%a8%8b%e5%ba%8f%e4%b8%8e%e7%b3%bb%e7%bb%9f%e7%9a%84%e4%bf%9d%e6%8a%a4%e6%9c%ba%e5%88%b6%e7%ae%80%e4%bb%8b","status":"publish","type":"post","link":"https:\/\/www.zhiwanyuzhou.com\/index.php\/2022\/06\/22\/linux%e7%a8%8b%e5%ba%8f%e4%b8%8e%e7%b3%bb%e7%bb%9f%e7%9a%84%e4%bf%9d%e6%8a%a4%e6%9c%ba%e5%88%b6%e7%ae%80%e4%bb%8b\/","title":{"rendered":"Linux\u7a0b\u5e8f\u4e0e\u7cfb\u7edf\u7684\u4fdd\u62a4\u673a\u5236\u7b80\u4ecb"},"content":{"rendered":"\n<h4>\u4e00\u3001\u7a0b\u5e8f\u4fdd\u62a4\u673a\u5236<\/h4>\n\n\n\n<p>Linux\u7a0b\u5e8f\u901a\u5e38\u662fELF\u683c\u5f0f\u7684\uff0c\u5173\u4e8e\u7a0b\u5e8f\u7684\u4fdd\u62a4\u673a\u5236\u6709\u5982\u4e0b\u51e0\u79cd\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u5e8f\u53f7<\/td><td>\u540d\u79f0<\/td><td>\u4f5c\u7528<\/td><\/tr><tr><td>1<\/td><td>RELRO<\/td><td>\u5c06\u7b26\u53f7\u91cd\u5b9a\u4f4d\u8868\uff08.got\uff09\u8bbe\u7f6e\u4e3a\u53ea\u8bfb<\/td><\/tr><tr><td>2<\/td><td>Stack-canary<\/td><td>\u6808\u6ea2\u51fa\u4fdd\u62a4\uff0c\u52a0\u5165\u7c7b\u4f3ccookie\u9a8c\u8bc1<\/td><\/tr><tr><td>3<\/td><td>NX<\/td><td>\u6808\u4e2d\u6570\u636e\u6ca1\u6709\u6267\u884c\u6743\u9650<\/td><\/tr><tr><td>4<\/td><td>PIE<\/td><td>\u968f\u673a\u5316\uff0c\u751f\u6210\u4e0e\u4f4d\u7f6e\u65e0\u5173\u53ef\u6267\u884c\u6587\u4ef6\uff0c\u7c7b\u4f3cASLR<\/td><\/tr><tr><td>5<\/td><td>FORTIFY<\/td><td>\u7531GCC\u5b9e\u73b0\u7684\u6e90\u7801\u7ea7\u522b\u7684\u4fdd\u62a4\u673a\u5236\uff0c\u4f7f\u7528\u5371\u9669\u51fd\u6570\u65f6\u4f1a\u68c0\u67e5\u8fb9\u754c<\/td><\/tr><tr><td>6<\/td><td>RPATH<\/td><td>\u5728\u641c\u7d22\u7a0b\u5e8f\u7684\u95f4\u63a5\u4f9d\u8d56\u5e93\u65f6\uff0cRPATH\u8d77\u4f5c\u7528<\/td><\/tr><tr><td>7<\/td><td>RUNPATH<\/td><td>\u5728\u4f7f\u7528RUNPATH\u7684\u60c5\u51b5\u4e0b\uff0c\u5f88\u53ef\u80fd\u8fd8\u8981\u518d\u914d\u5408LD_LIBRARY_PATH\u4e00\u5757\u4f7f\u7528<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u68c0\u67e5\u7a0b\u5e8f\u662f\u5426\u5f00\u542f\u8fd9\u4e9b\u4fdd\u62a4\u673a\u5236\uff0c\u53ef\u4ee5\u4f7f\u7528\u5de5\u5177checksec\uff0c\u5b89\u88c5\u65b9\u6cd5\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code has-palette-color-4-color has-palette-color-8-background-color has-text-color has-background\"><code># \u65b9\u6cd5\u4e00\uff1aubuntu \u7cfb\u7edf\u5b89\u88c5\nsudo apt install checksec \n# \u65b9\u6cd5\u4e8c\uff1a\u4e0b\u8f7d\u5b89\u88c5\ngit clone https:\/\/github.com\/slimm609\/checksec.sh\nsudo cp checksec.sh\/checksec \/usr\/local\/bin\/<\/code><\/pre>\n\n\n\n<p>\u4f7f\u7528\u65b9\u6cd5\u6bd4\u8f83\u7b80\u5355\uff0c\u8fd9\u662f\u4f7f\u7528gcc\u4e0d\u52a0\u53c2\u6570\u7f16\u8bd1\u7684\u7a0b\u5e8f\uff0c\u4f7f\u7528checksec\u5de5\u5177\u67e5\u770b\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/www.zhiwanyuzhou.com\/wp-content\/uploads\/2022\/06\/image-21-1024x42.png?v=1655907532\" alt=\"\" class=\"wp-image-1245\" width=\"1002\" height=\"40\" srcset=\"https:\/\/www.zhiwanyuzhou.com\/wp-content\/uploads\/2022\/06\/image-21-1024x42.png?v=1655907532 1024w, https:\/\/www.zhiwanyuzhou.com\/wp-content\/uploads\/2022\/06\/image-21-300x12.png?v=1655907532 300w, https:\/\/www.zhiwanyuzhou.com\/wp-content\/uploads\/2022\/06\/image-21-768x32.png?v=1655907532 768w, https:\/\/www.zhiwanyuzhou.com\/wp-content\/uploads\/2022\/06\/image-21.png?v=1655907532 1313w\" sizes=\"(max-width: 1002px) 100vw, 1002px\" \/><\/figure>\n\n\n\n<p>\u53ef\u4ee5\u770b\u51fa\u5f00\u542f\u7684\u4fdd\u62a4\u63aa\u65bd\u6709\uff1a\u9ed8\u8ba4\u5f00\u542f\u968f\u673a\u5316\uff0c\u5173\u95ed\u6808\u6267\u884c\u6743\u9650\uff0cgot\u8868\u8bbe\u7f6e\u4e3a\u53ea\u8bfb\u3002<\/p>\n\n\n\n<p>\u90a3\u4e48\u5982\u4f55\u5f00\u542f\u63aa\u65bd\u5462\uff0c\u4f7f\u7528gcc\u7f16\u8bd1\u7684\u65f6\u5019\u52a0\u4e0a\u5bf9\u5e94\u53c2\u6570\u5373\u53ef\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u5e8f\u53f7<\/td><td>\u540d\u79f0<\/td><td>gcc\u53c2\u6570\u793a\u4f8b<\/td><\/tr><tr><td>1<\/td><td>RELRO<\/td><td>-z norelro \uff08\u5173\u95ed\uff09<br>-z lazy       \uff08\u90e8\u5206\u5f00\u542f\uff09<br>-z now      \uff08\u5168\u5f00\u542f\uff09<\/td><\/tr><tr><td>2<\/td><td>Stack-canary<\/td><td>-fno-stack-protector \uff08\u5173\u95ed\uff09<br>-fstack-protector       \uff08\u5f00\u542f\uff09<br>-fstack-protector-all \uff08\u5168\u5f00\u542f\uff09&nbsp;<\/td><\/tr><tr><td>3<\/td><td>NX<\/td><td>-z execstack    \uff08\u5173\u95ed\uff09<br>-z noexecstack\uff08\u5f00\u542f\uff09<\/td><\/tr><tr><td>4<\/td><td>PIE<\/td><td>-no-pie \/ -pie (\u5173\u95ed \/ \u5f00\u542f)<br>-fpie -pie \uff08\u5f00\u542fPIE\uff0c\u6b64\u65f6\u5f3a\u5ea6\u4e3a1\uff09<br>-fPIE -pie  \uff08\u5f00\u542fPIE\uff0c\u6b64\u65f6\u4e3a\u6700\u9ad8\u5f3a\u5ea62\uff0c\u6ce8\u610f\u662f\u5927\u5199\u7684fPIE\uff09 <\/td><\/tr><tr><td>5<\/td><td>FORTIFY<\/td><td>-D_FORTIFY_SOURCE=1 \uff08\u8f83\u5f31\u7684\u68c0\u67e5\uff09<br>-D_FORTIFY_SOURCE=2 \uff08\u8f83\u5f3a\u7684\u68c0\u67e5\uff09<\/td><\/tr><tr><td>6<\/td><td>RPATH<\/td><td>gcc -L. main.c -Wl,--rpath='.',--disable-new-dtags -o main<\/td><\/tr><tr><td>7<\/td><td>RUNPATH<\/td><td>gcc -L. main.c -Wl,--rpath='.',--enable-new-dtags -o main<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h6 id=\"\u641c\u7d22so\u7684\u4f18\u5148\u7ea7\u987a\u5e8f\">\u6ce8\uff1a\u641c\u7d22.so\u7684\u4f18\u5148\u7ea7\u987a\u5e8f<\/h6>\n\n\n\n<ul><li>\u7f16\u8bd1\u76ee\u6807\u4ee3\u7801\u65f6\u6307\u5b9a\u7684\u52a8\u6001\u5e93\u641c\u7d22\u8def\u5f84\uff1b \u5982\u679c\u5728\u7f16\u8bd1\u7a0b\u5e8f\u65f6\u589e\u52a0\u53c2\u6570-Wl,-rpath='.' , \u8fd9\u65f6\u751f\u6210\u7a0b\u5e8f\u7684Dynamic section\u4f1a\u65b0\u52a0\u4e00\u4e2aRPATH\u6bb5<\/li><li>\u73af\u5883\u53d8\u91cfLD_LIBRARY_PATH\u6307\u5b9a\u7684\u52a8\u6001\u5e93\u641c\u7d22\u8def\u5f84\uff1b ( \u53ef\u7528export LD_LIBRARY_PATH=\"NEWDIRS\" \u547d\u4ee4\u6dfb\u52a0\u4e34\u65f6\u73af\u5883\u53d8\u91cf )<\/li><li>RUNPATH\uff1a \u5199\u5728elf\u6587\u4ef6\u4e2d<\/li><li>ldconfig\u7684\u7f13\u5b58\uff1a\u914d\u7f6e\u6587\u4ef6\/etc\/ld.so.conf\u4e2d\u6307\u5b9a\u7684\u52a8\u6001\u5e93\u641c\u7d22\u8def\u5f84\uff1b(\u7cfb\u7edf\u9ed8\u8ba4\u60c5\u51b5\u4e0b\u672a\u8bbe\u7f6e)<\/li><li>\u9ed8\u8ba4\u7684\u52a8\u6001\u5e93\u641c\u7d22\u8def\u5f84\/lib\uff1b<\/li><li>\u9ed8\u8ba4\u7684\u52a8\u6001\u5e93\u641c\u7d22\u8def\u5f84\/usr\/lib\uff1b<\/li><\/ul>\n\n\n\n<p>RPATH\u4e0eRUNPATH\u4e2d\u95f4\u9694\u7740LD_LIBRARY_PATH\uff0c\u53ef\u4ee5\u901a\u8fc7\u4fee\u6539LD_LIBRARY_PATH\u6765\u6307\u5b9a.so\u6587\u4ef6\uff0c\u5927\u591a\u6570\u7f16\u8bd1\u5668\u90fd\u5c06\u8f93\u51fa\u7684RPATH\u7559\u7a7a\uff0c\u5e76\u7528RUNPATH\u4ee3\u66ffRPATH\u3002<\/p>\n\n\n\n<h4>\u4e8c\u3001\u7cfb\u7edf\u4fdd\u62a4\u673a\u5236<\/h4>\n\n\n\n<p>ASLR\uff08Address space layout randomization\uff09\u662f\u4e00\u79cd\u9488\u5bf9\u7f13\u51b2\u533a\u6ea2\u51fa\u7684\u5b89\u5168\u4fdd\u62a4\u6280\u672f\uff0c\u901a\u8fc7\u5bf9\u5806\u3001\u6808\u3001\u5171\u4eab\u5e93\u6620\u5c04\u7b49\u7ebf\u6027\u533a\u5e03\u5c40\u7684\u968f\u673a\u5316\uff0c\u901a\u8fc7\u589e\u52a0\u653b\u51fb\u8005\u9884\u6d4b\u76ee\u7684\u5730\u5740\u7684\u96be\u5ea6\uff0c\u9632\u6b62\u653b\u51fb\u8005\u76f4\u63a5\u5b9a\u4f4d\u653b\u51fb\u4ee3\u7801\u4f4d\u7f6e\uff0c\u8fbe\u5230\u963b\u6b62\u6ea2\u51fa\u653b\u51fb\u7684\u76ee\u7684\u3002\u636e\u7814\u7a76\u8868\u660eASLR\u53ef\u4ee5\u6709\u6548\u7684\u964d\u4f4e\u7f13\u51b2\u533a\u6ea2\u51fa\u653b\u51fb\u7684\u6210\u529f\u7387\uff0c\u5982\u4ecaLinux\u3001FreeBSD\u3001MacOS\u3001Windows\u7b49\u4e3b\u6d41\u64cd\u4f5c\u7cfb\u7edf\u90fd\u5df2\u91c7\u7528\u4e86\u8be5\u6280\u672f\u3002\u901a\u8fc7\u4ee5\u4e0b\u65b9\u6cd5\u53ef\u67e5\u8be2\u7cfb\u7edf\u662f\u5426\u5f00\u542fASLR\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code has-palette-color-4-color has-palette-color-8-background-color has-text-color has-background\"><code># \u65b9\u6cd5\u4e00\uff1a\u4f7f\u7528\u547d\u4ee4\nsysctl -n kernel.randomize_va_space\n# \u65b9\u6cd5\u4e8c\uff1a\u67e5\u770b\u6587\u4ef6\ncat \/proc\/sys\/kernel\/randomize_va_space<\/code><\/pre>\n\n\n\n<p>\u67e5\u8be2\u4e4b\u540e\u663e\u793a\u4e00\u4e2a\u6570\u5b57\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" loading=\"lazy\" width=\"621\" height=\"77\" src=\"https:\/\/www.zhiwanyuzhou.com\/wp-content\/uploads\/2022\/06\/image-24.png\" alt=\"\" class=\"wp-image-1249\" srcset=\"https:\/\/www.zhiwanyuzhou.com\/wp-content\/uploads\/2022\/06\/image-24.png?v=1655909543 621w, https:\/\/www.zhiwanyuzhou.com\/wp-content\/uploads\/2022\/06\/image-24-300x37.png?v=1655909543 300w\" sizes=\"(max-width: 621px) 100vw, 621px\" \/><\/figure>\n\n\n\n<p>\u6570\u5b57\u542b\u4e49\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\u503c<\/td><td>\u5b9a\u4e49<\/td><\/tr><tr><td>0<\/td><td>\u5173\u95edASLR<\/td><\/tr><tr><td>1<\/td><td>mmap base\u3001stack\u3001vdso page\u5c06\u968f\u673a\u5316\u3002\u8fd9\u610f\u5473\u7740.so\u6587\u4ef6\u5c06\u88ab\u52a0\u8f7d\u5230\u968f\u673a\u5730\u5740\u3002\u94fe\u63a5\u65f6\u6307\u5b9a\u4e86-pie\u9009\u9879\u7684\u53ef\u6267\u884c\u7a0b\u5e8f\uff0c\u5176\u4ee3\u7801\u6bb5\u52a0\u8f7d\u5730\u5740\u5c06\u88ab\u968f\u673a\u5316\u3002\u914d\u7f6e\u5185\u6838\u65f6\u5982\u679c\u6307\u5b9a\u4e86CONFIG_COMPAT_BRK\uff0crandomize_va_space\u7f3a\u7701\u4e3a1\u3002\u6b64\u65f6heap\u6ca1\u6709\u968f\u673a\u5316\u3002<\/td><\/tr><tr><td>2<\/td><td>\u57281\u7684\u57fa\u7840\u4e0a\u589e\u52a0\u4e86heap\u968f\u673a\u5316\u3002\u914d\u7f6e\u5185\u6838\u65f6\u5982\u679c\u7981\u7528CONFIG_COMPAT_BRK\uff0crandomize_va_space\u7f3a\u7701\u4e3a2\u3002<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>\u6ce8\u610f\uff0c\u5f53\u7cfb\u7edf\u5f00\u542fASLR\uff0c\u7a0b\u5e8f\u5173\u95edPIE\uff0c\u7a0b\u5e8f\u4e5f\u662f<em>\u672a\u968f\u673a\u5316\u7684<\/em>\u3002<\/strong><\/p>\n\n\n\n<h6><strong>\u53c2\u8003\u94fe\u63a5\uff1a<\/strong><\/h6>\n\n\n\n<p><a href=\"https:\/\/blog.csdn.net\/weixin_62675330\/article\/details\/123203234\">https:\/\/blog.csdn.net\/weixin_62675330\/article\/details\/123203234<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/blog.csdn.net\/Little_Small_Joze\/article\/details\/114465018\">https:\/\/blog.csdn.net\/Little_Small_Joze\/article\/details\/114465018<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/blog.csdn.net\/pwl999\/article\/details\/111035160\">https:\/\/blog.csdn.net\/pwl999\/article\/details\/111035160<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/blog.csdn.net\/cszhouwei\/article\/details\/43277347\">https:\/\/blog.csdn.net\/cszhouwei\/article\/details\/43277347<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.cnblogs.com\/ar-cheng\/p\/13225342.html\">https:\/\/www.cnblogs.com\/ar-cheng\/p\/13225342.html<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.jianshu.com\/p\/0f25748e6ac7\">https:\/\/www.jianshu.com\/p\/0f25748e6ac7<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e00\u3001\u7a0b\u5e8f\u4fdd\u62a4\u673a\u5236 Linux\u7a0b\u5e8f\u901a\u5e38\u662fELF\u683c\u5f0f\u7684\uff0c\u5173\u4e8e\u7a0b\u5e8f\u7684\u4fdd\u62a4\u673a\u5236\u6709\u5982\u4e0b\u51e0\u79cd\uff1a \u5e8f\u53f7 \u540d\u79f0 \u4f5c\u7528 1 RELRO \u5c06\u7b26\u53f7\u91cd\u5b9a\u4f4d\u8868\uff08.got\uff09\u8bbe\u7f6e\u4e3a\u53ea\u8bfb 2 Stack-canary \u6808\u6ea2\u51fa\u4fdd\u62a4\uff0c\u52a0\u2026<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[11],"tags":[],"blocksy_meta":{"styles_descriptor":{"styles":{"desktop":"","tablet":"","mobile":""},"google_fonts":[],"version":5}},"_links":{"self":[{"href":"https:\/\/www.zhiwanyuzhou.com\/index.php\/wp-json\/wp\/v2\/posts\/1241"}],"collection":[{"href":"https:\/\/www.zhiwanyuzhou.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.zhiwanyuzhou.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.zhiwanyuzhou.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.zhiwanyuzhou.com\/index.php\/wp-json\/wp\/v2\/comments?post=1241"}],"version-history":[{"count":5,"href":"https:\/\/www.zhiwanyuzhou.com\/index.php\/wp-json\/wp\/v2\/posts\/1241\/revisions"}],"predecessor-version":[{"id":1252,"href":"https:\/\/www.zhiwanyuzhou.com\/index.php\/wp-json\/wp\/v2\/posts\/1241\/revisions\/1252"}],"wp:attachment":[{"href":"https:\/\/www.zhiwanyuzhou.com\/index.php\/wp-json\/wp\/v2\/media?parent=1241"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.zhiwanyuzhou.com\/index.php\/wp-json\/wp\/v2\/categories?post=1241"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.zhiwanyuzhou.com\/index.php\/wp-json\/wp\/v2\/tags?post=1241"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}