Theo de Raadt adicionou \u00e0 base de c\u00f3digo do OpenBSD uma s\u00e9rie de patches para prote\u00e7\u00e3o adicional da mem\u00f3ria dos processos no espa\u00e7o do usu\u00e1rio. Os desenvolvedores receberam uma nova chamada de sistema e uma fun\u00e7\u00e3o de biblioteca hom\u00f4nima, mimmutable, que permite fixar as permiss\u00f5es de acesso durante o mapeamento na mem\u00f3ria. Depois de fixar, as permiss\u00f5es atribu\u00eddas \u00e0 \u00e1rea de mem\u00f3ria, como proibi\u00e7\u00e3o de grava\u00e7\u00e3o e execu\u00e7\u00e3o, n\u00e3o podem ser alteradas em chamadas subsequentes das fun\u00e7\u00f5es mmap(), mprotect() e munmap(), que, ao tentarem ser alteradas, geram um erro EPERM. <\/p>\n
Para gerenciar a capacidade de alterar as permiss\u00f5es da mem\u00f3ria refletida para arquivos de objeto, uma nova se\u00e7\u00e3o Mutable BSS (.openbsd.mutable, Mutable Block Starting Symbol) foi proposta, e novos flags PF_MUTABLE e UVM_ET_IMMUTABLE foram adicionados. O vinculador agora oferece suporte \u00e0 defini\u00e7\u00e3o das se\u00e7\u00f5es \u201copenbsd.mutable\u201d e ao seu posicionamento em uma \u00e1rea separada na BSS, alinhada \u00e0 borda da p\u00e1gina de mem\u00f3ria. Atrav\u00e9s da chamada da fun\u00e7\u00e3o mimmutable, \u00e9 poss\u00edvel marcar todas as \u00e1reas refletidas como imut\u00e1veis (immutable), exceto as se\u00e7\u00f5es marcadas como \u201copenbsd.mutable\u201d. Essa nova funcionalidade ser\u00e1 disponibilizada aos usu\u00e1rios na vers\u00e3o OpenBSD 7.3. \u0422\u044d\u043e \u0434\u0435 \u0420\u0430\u0430\u0434\u0442 (Theo de Raadt) \u0434\u043e\u0431\u0430\u0432\u0438\u043b \u0432 \u043a\u043e\u0434\u043e\u0432\u0443\u044e \u0431\u0430\u0437\u0443 OpenBSD \u0441\u0435\u0440\u0438\u044e \u043f\u0430\u0442\u0447\u0435\u0439 \u0434\u043b\u044f \u0434\u043e\u043f\u043e\u043b\u043d\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0439 \u0437\u0430\u0449\u0438\u0442\u044b \u043f\u0430\u043c\u044f\u0442\u0438 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0432 \u0432 \u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0441\u0442\u0432\u0435 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f. \u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0430\u043c \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d \u043d\u043e\u0432\u044b\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u043d\u044b\u0439 \u0432\u044b\u0437\u043e\u0432 \u0438 \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u0430\u044f \u0441 \u043d\u0438\u043c \u043e\u0434\u043d\u043e\u0438\u043c\u0451\u043d\u043d\u0430\u044f \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u0447\u043d\u0430\u044f \u0444\u0443\u043d\u043a\u0446\u0438\u044f mimmutable, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0437\u0430\u0444\u0438\u043a\u0441\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u043f\u0440\u0430\u0432\u0430 \u0434\u043e\u0441\u0442\u0443\u043f\u0430 \u043f\u0440\u0438 \u043e\u0442\u0440\u0430\u0436\u0435\u043d\u0438\u0438 \u0432 \u043f\u0430\u043c\u044f\u0442\u044c (memory mappings). \u041f\u043e\u0441\u043b\u0435 \u0444\u0438\u043a\u0441\u0430\u0446\u0438\u0438, \u0432\u044b\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u043d\u044b\u0435 \u0434\u043b\u044f \u043e\u0431\u043b\u0430\u0441\u0442\u0438 \u043f\u0430\u043c\u044f\u0442\u0438 \u043f\u0440\u0430\u0432\u0430, \u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u0437\u0430\u043f\u0440\u0435\u0442 \u043d\u0430 \u0437\u0430\u043f\u0438\u0441\u044c […]<\/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-105272","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\udd47No OpenBSD foram aceitas mudan\u00e7as para prote\u00e7\u00e3o adicional da mem\u00f3ria dos processos | ProHoster","description":"Theo de Raadt adicionou \u00e0 base de c\u00f3digo do OpenBSD uma s\u00e9rie de patches para prote\u00e7\u00e3o adicional da mem\u00f3ria dos processos no 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Fonte: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"