{"id":119941,"date":"2024-09-25T15:43:10","date_gmt":"2024-09-25T13:43:10","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/v-openbsd-zapretili-ispolzovanie-nulevyh-simvolov-v-shell-skriptah"},"modified":"2024-09-25T15:43:10","modified_gmt":"2024-09-25T13:43:10","slug":"v-openbsd-zapretili-ispolzovanie-nulevyh-simvolov-v-shell-skriptah","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/v-openbsd-zapretili-ispolzovanie-nulevyh-simvolov-v-shell-skriptah","title":{"rendered":"V OpenBSD byla zak\u00e1z\u00e1na pou\u017e\u00edv\u00e1n\u00ed nulov\u00fdch znak\u016f v shell skriptech","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Theo de Raadt p\u0159idal zm\u011bnu, kter\u00e1 zakazuje pou\u017eit\u00ed znaku s nulov\u00fdm k\u00f3dem v shell skriptech zpracov\u00e1van\u00fdch v\u00fdchoz\u00edm p\u0159\u00edkazov\u00fdm interpretem ksh. P\u0159\u00edtomnost nulov\u00fdch znak\u016f ve skriptech nyn\u00ed povede k ukon\u010den\u00ed prov\u00e1d\u011bn\u00ed s v\u00fdstupem chyby, krom\u011b p\u0159\u00edpad\u016f, kdy jsou um\u00edst\u011bny mezi daty p\u0159ipojen\u00fdmi na konci souboru za k\u00f3dem. Zm\u011bna je sou\u010d\u00e1st\u00ed v\u011btve OpenBSD-Current, na jej\u00edm\u017e z\u00e1klad\u011b bude vytvo\u0159en release OpenBSD 7.6. <\/p>\n

Je poznamen\u00e1no, \u017ee takov\u00e1 zm\u011bna vylou\u010d\u00ed nejasnosti chov\u00e1n\u00ed spojen\u00e9 se zpracov\u00e1n\u00edm nulov\u00e9ho znaku v k\u00f3du napsan\u00e9m v jazyce C a pou\u017e\u00edvaj\u00edc\u00edm \u0159et\u011bzce, kde je nulov\u00fd byte pou\u017eit pro indikaci konce \u0159et\u011bzce. Studium zpracov\u00e1n\u00ed nulov\u00e9ho znaku v r\u016fzn\u00fdch shellech uk\u00e1zalo, \u017ee v ka\u017ed\u00e9m z nich bylo zji\u0161t\u011bno jeden nebo v\u00edce p\u0159\u00edpad\u016f, kdy nulov\u00fd byte ve vstupn\u00edch datech nebo obsahu prom\u011bnn\u00fdch vedl k odli\u0161n\u00e9mu chov\u00e1n\u00ed ne\u017e v jin\u00fdch shellech. Nap\u0159\u00edklad n\u011bkter\u00e9 shelly jej ignorovaly, n\u011bkter\u00e9 jej nahradily mezerou a n\u011bkter\u00e9 ukon\u010dily dal\u0161\u00ed anal\u00fdzu skriptu nebo p\u0159eru\u0161ily jeho prov\u00e1d\u011bn\u00ed.
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0422\u044d\u043e \u0434\u0435 \u0420\u0430\u0430\u0434\u0442 (Theo de Raadt) \u0434\u043e\u0431\u0430\u0432\u0438\u043b \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u0435, \u0437\u0430\u043f\u0440\u0435\u0449\u0430\u044e\u0449\u0435\u0435 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u0441\u0438\u043c\u0432\u043e\u043b\u0430 \u0441 \u043d\u0443\u043b\u0435\u0432\u044b\u043c \u043a\u043e\u0434\u043e\u043c \u0432 shell-\u0441\u043a\u0440\u0438\u043f\u0442\u0430\u0445, \u043e\u0431\u0440\u0430\u0431\u0430\u0442\u044b\u0432\u0430\u0435\u043c\u044b\u0445 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u044b\u043c \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u043a\u043e\u043c\u0430\u043d\u0434\u043d\u044b\u043c \u0438\u043d\u0442\u0435\u0440\u043f\u0440\u0435\u0442\u0430\u0442\u043e\u0440\u043e\u043c ksh. \u041d\u0430\u043b\u0438\u0447\u0438\u0435 \u043d\u0443\u043b\u0435\u0432\u044b\u0445 \u0441\u0438\u043c\u0432\u043e\u043b\u043e\u0432 \u0432 \u0441\u043a\u0440\u0438\u043f\u0442\u0430\u0445 \u0442\u0435\u043f\u0435\u0440\u044c \u0431\u0443\u0434\u0435\u0442 \u043f\u0440\u0438\u0432\u043e\u0434\u0438\u0442\u044c \u043a \u0437\u0430\u0432\u0435\u0440\u0448\u0435\u043d\u0438\u044e \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0441 \u0432\u044b\u0432\u043e\u0434\u043e\u043c \u043e\u0448\u0438\u0431\u043a\u0438, \u0437\u0430 \u0438\u0441\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435\u043c \u0441\u043b\u0443\u0447\u0430\u0435\u0432 \u0438\u0445 \u0440\u0430\u0437\u043c\u0435\u0449\u0435\u043d\u0438\u044f \u0441\u0440\u0435\u0434\u0438 \u0434\u0430\u043d\u043d\u044b\u0445, \u043f\u0440\u0438\u043a\u0440\u0435\u043f\u043b\u0451\u043d\u043d\u044b\u0445 \u0432 \u043a\u043e\u043d\u0446\u0435 \u0444\u0430\u0439\u043b\u0430 \u0441\u043b\u0435\u0434\u043e\u043c \u0437\u0430 \u043a\u043e\u0434\u043e\u043c. \u0418\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u0435 \u0432\u043a\u043b\u044e\u0447\u0435\u043d\u043e \u0432 \u0441\u043e\u0441\u0442\u0430\u0432 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-119941","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47V OpenBSD zak\u00e1zali pou\u017e\u00edv\u00e1n\u00ed nulov\u00fdch znak\u016f v shell skriptech | ProHoster","description":"Theo de Raadt p\u0159idal zm\u011bnu, kter\u00e1 zakazuje pou\u017eit\u00ed znaku s nulov\u00fdm k\u00f3dem v shell skriptech zpracov\u00e1van\u00fdch v\u00fdchoz\u00edm p\u0159\u00edkazov\u00fdm interpretem 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