{"id":106,"date":"2016-12-14T10:49:17","date_gmt":"2016-12-14T10:49:17","guid":{"rendered":"http:\/\/www.luo666.com\/?p=106"},"modified":"2019-01-19T04:45:08","modified_gmt":"2019-01-19T04:45:08","slug":"%e4%bf%ae%e6%94%b9%e8%bf%90%e8%a1%8c%e4%b8%ad%e4%bb%a3%e7%a0%81%e4%b9%8b%e7%a5%9e%e5%99%a8-ptrace%e7%9a%84%e7%a7%98%e8%af%80","status":"publish","type":"post","link":"http:\/\/www.luo666.com\/?p=106","title":{"rendered":"\u4fee\u6539\u8fd0\u884c\u4e2d\u4ee3\u7801\u4e4b\u795e\u5668\u2014\u2014PTRACE\u7684\u79d8\u8bc0"},"content":{"rendered":"<div>ptrace\u662f\u4e2a\u795e\u5947\u7684\u7cfb\u7edf\u8c03\u7528\uff0c\u662fgdb\u7b49\u5de5\u5177\u7684\u5b9e\u73b0\u57fa\u7840\uff0c\u5b83\u53ef\u4ee5\u7528\u6765\u76d1\u63a7\u8fdb\u7a0b\u7684\u6267\u884c\uff0c\u8bfb\u53d6\u6216\u4fee\u6539\u8fdb\u7a0b\u7684\u5bc4\u5b58\u5668\u548cmemory\u5185\u5bb9\u5305\u62ec\u4ee3\u7801\u6bb5\u3002\u6709\u7684\u5e95\u5c42\u7801\u519c\u8001\u53f8\u673a\u751a\u81f3\u4e5f\u4f1a\u89c9\u5f97\u5947\u602a\uff0c\u4ee3\u7801\u6bb5\u4e0d\u90fd\u662f\u4e0d\u53ef\u5199\u7684\u5417\uff0c\u4e3a\u5565ptrace\u5c31\u80fd\u4fee\u6539\u5462\uff1f<\/div>\n<div>\n<hr \/>\n<\/div>\n<div>\u4e0b\u9762\u89e3\u91ca\u4e00\u4e0b\uff0c\u8001\u53f8\u673a\u76f4\u63a5\u770b\u540e\u9762\u4ee3\u7801\u79d2\u61c2\uff1a<\/div>\n<ul>\n<li>\u9996\u5148\uff0c\u4ee3\u7801\u6bb5\u4e0d\u53ef\u5199\uff0c\u5176\u5b9e\u662f\u5728\u9875\u8868\u4e2d\u5bf9\u4ee3\u7801\u6bb5\u76f8\u5e94\u7684\u9875\u8bbe\u7f6e\u4e86\u4e0d\u53ef\u5199\u7684flag\uff0c\u800c\u9875\u8868\u53ea\u80fd\u63a7\u5236\u8fdb\u7a0b\u5730\u5740\u7a7a\u95f4\u7684\u8bbf\u95ee\u6743\u9650\u3002<\/li>\n<li>\u5176\u6b21\uff0c\u8fd9\u91cc\u7684\u4e0d\u53ef\u5199\u53ea\u5bf9\u7528\u6237\u6001\u8fdb\u7a0b\u8d77\u4f5c\u7528\u3002\u5f53\u7136\uff0c\u8fdb\u7a0b\u7684\u5730\u5740\u7a7a\u95f4\u662f\u9694\u79bb\u7684\uff0c\u800c\u8fdb\u7a0b\u5728\u7528\u6237\u6001\u53ea\u80fd\u901a\u8fc7\u81ea\u5df1\u5730\u5740\u7a7a\u95f4\u7684\u865a\u62df\u5730\u5740\u8bbf\u95ee\u5185\u5b58\uff0c\u6240\u4ee5\u5f53\u524d\u8fdb\u7a0b\u5728\u7528\u6237\u6001\u4e5f\u65e0\u6cd5\u8bbf\u95ee\u5176\u4ed6\u8fdb\u7a0b\u7684\u5730\u5740\u7a7a\u95f4\u3002<\/li>\n<li>\u6700\u540e\uff0c\u5728\u5185\u6838\u6001\u5c31\u80fd\u968f\u4fbf\u4fee\u6539\u5176\u4ed6\u8fdb\u7a0b\u7684\u4ee3\u7801\u6bb5\u4e86\uff1f\u662f\u7684\uff0c\u4f46\u662f\u4f60\u5f97\u5148\u627e\u5230\u76ee\u6807\u4ee3\u7801\u6bb5\u5730\u5740\u7a7a\u95f4\u5bf9\u5e94\u7684\u7269\u7406\u9875\uff0c\u7136\u540e\u518d\u6620\u5c04\u5230\u5185\u6838\u5730\u5740\u7a7a\u95f4\uff0c\u7136\u540e\u65b0\u7684\u5730\u5740\u7a7a\u95f4\u7684\u8bbf\u95ee\u6743\u9650\u51b3\u5b9a\u4e86\u4f60\u80fd\u5982\u4f55\u8bbf\u95ee\u8fd9\u4e9b\u7269\u7406\u9875\uff1bptrace\u4e2d\u5982\u4e0b\u8fd9\u6bb5\u4ee3\u7801\u5b9e\u73b0\u4e86\u8fd9\u4e9b\u529f\u80fd\uff0c\u5982\u4f55\u80fd\u6267\u884c\u5230\u8fd9\u4e9b\u4ee3\u7801\u53c8\u662f\u53e6\u5916\u4e00\u4e2a\u8bdd\u9898\u4e86\uff1b\u8fd9\u91cc\u9762\u7275\u6d89\u5230\u6743\u9650\u7ba1\u7406\u7b49\u7b49\u7684\u95ee\u9898\uff0cptrace\u7cfb\u7edf\u8c03\u7528\u5df2\u7ecf\u8003\u8651\u7684\u5f88\u5468\u5168\u4e86\uff0c\u535a\u4e3b\u4f1a\u5728\u4e0b\u4e00\u7bc7\u535a\u5ba2\u91cc\u9762\u8be6\u89e3ptrace\u7cfb\u7edf\u8c03\u7528\u7684\u6743\u9650\u68c0\u67e5~<\/li>\n<\/ul>\n<div><\/div>\n<div>ptrace_request()<\/div>\n<div>\u00a0 \u00a0 case PTRACE_POKETEXT:<\/div>\n<div>\u00a0 \u00a0 case PTRACE_POKEDATA:<\/div>\n<div>\u00a0 \u00a0 \u00a0 \u00a0 return generic_ptrace_pokedata(child, addr, data); \/\/\u8c03\u7528__access_remote_vm<\/div>\n<div>\u00a0\u6700\u540e\u7684\u5173\u952e\u4ee3\u7801\uff1a<\/div>\n<div>ret = <strong>get_user_pages<\/strong>(tsk, mm, addr, 1,<\/div>\n<div>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 write, 1, &amp;page, &amp;vma);<\/div>\n<div>&#8230;&#8230;<\/div>\n<div>maddr = <strong>kmap<\/strong>(page);<\/div>\n<div>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 if (write) {<\/div>\n<div>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 copy_to_user_page(vma, page, addr,<\/div>\n<div>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 maddr + offset, buf, bytes);<\/div>\n<div>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 set_page_dirty_lock(page);<\/div>\n<div>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 } else {<\/div>\n<div>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 copy_from_user_page(vma, page, addr,<\/div>\n<div>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 buf, maddr + offset, bytes);<\/div>\n<div>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }<\/div>\n<div>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 kunmap(page);<\/div>\n","protected":false},"excerpt":{"rendered":"<p>ptrace\u662f\u4e2a\u795e\u5947\u7684\u7cfb\u7edf\u8c03\u7528\uff0c\u662fgdb\u7b49\u5de5\u5177\u7684\u5b9e\u73b0\u57fa\u7840\uff0c\u5b83\u53ef\u4ee5\u7528\u6765\u76d1\u63a7\u8fdb\u7a0b\u7684\u6267\u884c\uff0c\u8bfb\u53d6\u6216\u4fee\u6539\u8fdb\u7a0b\u7684\u5bc4\u5b58\u5668\u548cmemory\u5185\u5bb9\u5305\u62ec\u4ee3\u7801\u6bb5\u3002\u6709\u7684\u5e95\u5c42\u7801\u519c\u8001\u53f8\u673a\u751a\u81f3\u4e5f\u4f1a\u89c9\u5f97\u5947\u602a\uff0c\u4ee3\u7801\u6bb5\u4e0d\u90fd\u662f\u4e0d\u53ef\u5199\u7684\u5417\uff0c\u4e3a\u5565ptrace\u5c31\u80fd\u4fee\u6539\u5462\uff1f \u4e0b\u9762\u89e3\u91ca\u4e00\u4e0b\uff0c\u8001\u53f8\u673a\u76f4\u63a5\u770b\u540e\u9762\u4ee3\u7801\u79d2\u61c2\uff1a \u9996\u5148\uff0c\u4ee3\u7801\u6bb5\u4e0d\u53ef\u5199\uff0c\u5176\u5b9e\u662f\u5728\u9875\u8868\u4e2d\u5bf9\u4ee3\u7801\u6bb5\u76f8\u5e94\u7684\u9875\u8bbe\u7f6e\u4e86\u4e0d\u53ef\u5199\u7684flag\uff0c\u800c\u9875\u8868\u53ea\u80fd\u63a7\u5236\u8fdb\u7a0b\u5730\u5740\u7a7a\u95f4\u7684\u8bbf\u95ee\u6743\u9650\u3002 \u5176\u6b21\uff0c\u8fd9\u91cc\u7684\u4e0d\u53ef\u5199\u53ea\u5bf9\u7528\u6237\u6001\u8fdb\u7a0b\u8d77\u4f5c\u7528\u3002\u5f53\u7136\uff0c\u8fdb\u7a0b\u7684\u5730\u5740\u7a7a\u95f4\u662f\u9694\u79bb\u7684\uff0c\u800c\u8fdb\u7a0b\u5728\u7528\u6237\u6001\u53ea\u80fd\u901a\u8fc7\u81ea\u5df1\u5730\u5740\u7a7a\u95f4\u7684\u865a\u62df\u5730\u5740\u8bbf\u95ee\u5185\u5b58\uff0c\u6240\u4ee5\u5f53\u524d\u8fdb\u7a0b\u5728\u7528\u6237\u6001\u4e5f\u65e0\u6cd5\u8bbf\u95ee\u5176\u4ed6\u8fdb\u7a0b\u7684\u5730\u5740\u7a7a\u95f4\u3002 \u6700\u540e\uff0c\u5728\u5185\u6838\u6001\u5c31\u80fd\u968f\u4fbf\u4fee\u6539\u5176\u4ed6\u8fdb\u7a0b\u7684\u4ee3\u7801\u6bb5\u4e86\uff1f\u662f\u7684\uff0c\u4f46\u662f\u4f60\u5f97\u5148\u627e\u5230\u76ee\u6807\u4ee3\u7801\u6bb5\u5730\u5740\u7a7a\u95f4\u5bf9\u5e94\u7684\u7269\u7406\u9875\uff0c\u7136\u540e\u518d\u6620\u5c04\u5230\u5185\u6838\u5730\u5740\u7a7a\u95f4\uff0c\u7136\u540e\u65b0\u7684\u5730\u5740\u7a7a\u95f4\u7684\u8bbf\u95ee\u6743\u9650\u51b3\u5b9a\u4e86\u4f60\u80fd\u5982\u4f55\u8bbf\u95ee\u8fd9\u4e9b\u7269\u7406\u9875\uff1bptrace\u4e2d\u5982\u4e0b\u8fd9\u6bb5\u4ee3\u7801\u5b9e\u73b0\u4e86\u8fd9\u4e9b\u529f\u80fd\uff0c\u5982\u4f55\u80fd\u6267\u884c\u5230\u8fd9\u4e9b\u4ee3\u7801\u53c8\u662f\u53e6\u5916\u4e00\u4e2a\u8bdd\u9898\u4e86\uff1b\u8fd9\u91cc\u9762\u7275\u6d89\u5230\u6743\u9650\u7ba1\u7406\u7b49\u7b49\u7684\u95ee\u9898\uff0cptrace\u7cfb\u7edf\u8c03\u7528\u5df2\u7ecf\u8003\u8651\u7684\u5f88\u5468\u5168\u4e86\uff0c\u535a\u4e3b\u4f1a\u5728\u4e0b\u4e00\u7bc7\u535a\u5ba2\u91cc\u9762\u8be6\u89e3ptrace\u7cfb\u7edf\u8c03\u7528\u7684\u6743\u9650\u68c0\u67e5~ ptrace_request() \u00a0 \u00a0 case PTRACE_POKETEXT: \u00a0 \u00a0 case PTRACE_POKEDATA: \u00a0 \u00a0 \u00a0 \u00a0 return generic_ptrace_pokedata(child, addr, data); \/\/\u8c03\u7528__access_remote_vm \u00a0\u6700\u540e\u7684\u5173\u952e\u4ee3\u7801\uff1a ret = get_user_pages(tsk, mm, addr, 1, \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 write, 1, &amp;page, &amp;vma); &#8230;&#8230; maddr = kmap(page); \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 if (write) { &hellip; <a href=\"http:\/\/www.luo666.com\/?p=106\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;\u4fee\u6539\u8fd0\u884c\u4e2d\u4ee3\u7801\u4e4b\u795e\u5668\u2014\u2014PTRACE\u7684\u79d8\u8bc0&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"footnotes":"","_jetpack_memberships_contains_paid_content":false,"jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false}}},"categories":[3],"tags":[],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p7Dhki-1I","jetpack-related-posts":[],"_links":{"self":[{"href":"http:\/\/www.luo666.com\/index.php?rest_route=\/wp\/v2\/posts\/106"}],"collection":[{"href":"http:\/\/www.luo666.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.luo666.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.luo666.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.luo666.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=106"}],"version-history":[{"count":2,"href":"http:\/\/www.luo666.com\/index.php?rest_route=\/wp\/v2\/posts\/106\/revisions"}],"predecessor-version":[{"id":108,"href":"http:\/\/www.luo666.com\/index.php?rest_route=\/wp\/v2\/posts\/106\/revisions\/108"}],"wp:attachment":[{"href":"http:\/\/www.luo666.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=106"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.luo666.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=106"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.luo666.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=106"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}