{"id":136,"date":"2025-07-22T14:22:39","date_gmt":"2025-07-22T06:22:39","guid":{"rendered":"http:\/\/lycoreco.cn\/?p=136"},"modified":"2025-07-22T14:22:40","modified_gmt":"2025-07-22T06:22:40","slug":"ctfshowpwn138%e3%80%81pwn139","status":"publish","type":"post","link":"http:\/\/lycoreco.cn\/index.php\/2025\/07\/22\/ctfshowpwn138%e3%80%81pwn139\/","title":{"rendered":"ctfshow:pwn138\u3001pwn139"},"content":{"rendered":"\n


1\u3001pwn138<\/h2>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

\u7ee7\u7eed\u505a\u524d\u7f6e\u57fa\u7840\uff0c\u8fd9\u4e2a\u597d\u50cf\u662f\u5173\u4e8emmap\u7684\uff0c\u5b66\u4e60\u4e00\u4e0b<\/p>\n\n\n\n

mian\u51fd\u6570\uff1a<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

getpid()\u6628\u5929\u9047\u5230\u8fc7\u662f\u7528\u6765\u83b7\u53d6\u5f53\u524d\u8fdb\u7a0b\u7684\u8fdb\u7a0b\u6807\u8bc6\u7b26\uff08PID\uff09\u3002\u8fd9\u4e2a\u6807\u8bc6\u7b26\u662f\u4e00\u4e2a\u552f\u4e00\u7684\u6570\u5b57\uff0c\u64cd\u4f5c\u7cfb\u7edf\u7528\u5b83\u6765\u533a\u5206\u4e0d\u540c\u7684\u8fdb\u7a0b\u3002<\/p>\n\n\n\n

\u63a5\u7740\u6253\u5370\u4e86\u8fd9\u4e2a\u8fdb\u7a0b\u7684PID<\/p>\n\n\n\n

mmap\u51fd\u6570\uff1a<\/p>\n\n\n\n

mmap\u5141\u8bb8\u7528\u6237\u5c06\u4e00\u4e2a\u6587\u4ef6\u6216\u5176\u4ed6\u5bf9\u8c61\u6620\u5c04\u5230\u5185\u5b58\u4e2d\u3002\u8fd9\u6837\uff0c\u5bf9\u8fd9\u6bb5\u5185\u5b58\u7684\u8bfb\u5199\u64cd\u4f5c\u5c31\u76f8\u5f53\u4e8e\u5bf9\u6587\u4ef6\u672c\u8eab\u7684\u8bfb\u5199\uff0c\u800c\u65e0\u9700\u518d\u8c03\u7528read()\u548cwrite()\u7cfb\u7edf\u8c03\u7528\uff0c\u4ece\u800c\u63d0\u9ad8\u4e86\u6587\u4ef6\u64cd\u4f5c\u7684\u6548\u7387\u3002<\/p>\n\n\n\n

\u770b\u4e00\u4e0b\u51fd\u6570\u7684\u539f\u578b\uff1a<\/p>\n\n\n\n

void* mmap(void* start, size_t length, int prot, int flags, int fd, off_t offset);<\/code><\/pre>\n\n\n\n
start<\/strong>\uff1a\u6307\u5411\u6b32\u6620\u5c04\u7684\u5185\u5b58\u8d77\u59cb\u5730\u5740\uff0c\u901a\u5e38\u8bbe\u4e3aNULL\uff0c\u4ee3\u8868\u8ba9\u7cfb\u7edf\u81ea\u52a8\u9009\u5b9a\u5730\u5740\u3002<\/p>\n\n\n\n
length<\/strong>\uff1a\u4ee3\u8868\u5c06\u6587\u4ef6\u4e2d\u591a\u5927\u7684\u90e8\u5206\u6620\u5c04\u5230\u5185\u5b58\u3002<\/p>\n\n\n\n
prot<\/strong>\uff1a\u6620\u5c04\u533a\u57df\u7684\u4fdd\u62a4\u65b9\u5f0f\uff0c\u53ef\u4ee5\u662fPROT_EXEC\u3001PROT_READ\u3001PROT_WRITE\u3001PROT_NONE\u7684\u7ec4\u5408\u3002<\/p>\n\n\n\n
flags<\/strong>\uff1a\u5f71\u54cd\u6620\u5c04\u533a\u57df\u7684\u5404\u79cd\u7279\u6027\uff0c\u5fc5\u987b\u6307\u5b9aMAP_SHARED\u6216MAP_PRIVATE\u3002<\/p>\n\n\n\n
fd<\/strong>\uff1a\u8981\u6620\u5c04\u5230\u5185\u5b58\u4e2d\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/p>\n\n\n\n
offset<\/strong>\uff1a\u6587\u4ef6\u6620\u5c04\u7684\u504f\u79fb\u91cf\uff0c\u901a\u5e38\u8bbe\u7f6e\u4e3a0\uff0c\u4ee3\u8868\u4ece\u6587\u4ef6\u6700\u524d\u65b9\u5f00\u59cb\u5bf9\u5e94\uff0c\u5fc5\u987b\u662f\u5206\u9875\u5927\u5c0f\u7684\u6574\u6570\u500d\u3002<\/p>\n\n\n\n
\u6210\u529f\u6267\u884c\u65f6\uff0cmmap<\/strong>\u8fd4\u56de\u88ab\u6620\u5c04\u533a\u7684\u5185\u5b58\u8d77\u59cb\u5730\u5740\uff1b\u5931\u8d25\u5219\u8fd4\u56deMAP_FAILED(-1)\uff0c\u9519\u8bef\u539f\u56e0\u5b58\u4e8eerrno\u4e2d\u3002<\/p>\n\n\n\n
\u8fd9\u6837\u5c31\u548cmain\u91cc\u7684\u4ee3\u7801\u5bf9\u5e94\u8d77\u6765\u4e86<\/p>\n\n\n\n
addr = mmap(0LL, 0x21000uLL, 3, 34, -1, 0LL)<\/code><\/pre>\n\n\n\n
\u5efa\u7acb\u4e86\u4e00\u4e2a\u533a\u57df<\/p>\n\n\n\n
munmap\u51fd\u6570\uff1a<\/p>\n\n\n\n
\u51fd\u6570\u7528\u4e8e\u53d6\u6d88\u6620\u5c04<\/p>\n\n\n\n
int munmap(void *start, size_t length);<\/code><\/pre>\n\n\n\n
\u53c2\u6570start<\/em>\u662fmmap<\/em>\u8fd4\u56de\u7684\u5730\u5740\uff0clength<\/em>\u662f\u6620\u5c04\u533a\u7684\u5927\u5c0f\u3002\u6210\u529f\u6267\u884c\u65f6\uff0cmunmap<\/em>\u8fd4\u56de0\uff0c\u5931\u8d25\u65f6\u8fd4\u56de-1\u3002<\/p>\n\n\n\n
\u7a0b\u5e8f\u6700\u540e\u53c8\u53d6\u6d88\u4e86\u4e4b\u524d\u521b\u5efa\u7684\u533a\u57df\uff0c\u5c31\u662f\u8fd9\u6837\uff0c\u6700\u540e\u62ffflag<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

getchar\u7528\u6765\u6253\u65ad\u6267\u884c\uff0c\u6ca1\u4ec0\u4e48\u7279\u522b\u7684\u5e94\u8be5<\/p>\n\n\n\n

2\u3001pwn139<\/h2>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

\u4e3b\u8981\u5c31\u662f\u4e0b\u9762\u8fd9\u6bb5\u4ee3\u7801\uff1a<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

\u5176\u5b9e\u5c31\u662f\u7533\u8bf7\u4e86\u4e00\u4e2a\u5806\u7136\u540e\u628aflag\u8bfb\u5165\u5e76\u8f93\u51fa\uff0c\u6700\u540e\u91ca\u653e\u5806<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

\u597d\u5566\uff0c\u5c31\u5230\u8fd9\u513f<\/p>\n","protected":false},"excerpt":{"rendered":"
1\u3001pwn138 \u7ee7\u7eed\u505a\u524d\u7f6e\u57fa\u7840\uff0c\u8fd9\u4e2a\u597d\u50cf\u662f\u5173\u4e8emmap\u7684\uff0c\u5b66\u4e60\u4e00\u4e0b mian\u51fd\u6570\uff1a getpid()\u6628\u5929\u9047\u5230 […]<\/p>\n","protected":false},"author":1,"featured_media":144,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[4],"class_list":["post-136","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-learn","tag-pwn"],"_links":{"self":[{"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/posts\/136","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/comments?post=136"}],"version-history":[{"count":1,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/posts\/136\/revisions"}],"predecessor-version":[{"id":145,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/posts\/136\/revisions\/145"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/media\/144"}],"wp:attachment":[{"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/media?parent=136"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/categories?post=136"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/tags?post=136"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}