{"id":105272,"date":"2022-10-09T09:37:09","date_gmt":"2022-10-09T07:37:09","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/v-openbsd-prinyaty-izmeneniya-dlya-dopolnitelnoj-zashhity-pamyati-proczessov"},"modified":"2022-10-09T09:37:09","modified_gmt":"2022-10-09T07:37:09","slug":"v-openbsd-prinyaty-izmeneniya-dlya-dopolnitelnoj-zashhity-pamyati-proczessov","status":"publish","type":"post","link":"https:\/\/prohoster.info\/fr\/blog\/news\/v-openbsd-prinyaty-izmeneniya-dlya-dopolnitelnoj-zashhity-pamyati-proczessov","title":{"rendered":"Des modifications ont \u00e9t\u00e9 apport\u00e9es dans OpenBSD pour une protection suppl\u00e9mentaire de la m\u00e9moire des processus.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Theo de Raadt a ajout\u00e9 \u00e0 la base de code d'OpenBSD une s\u00e9rie de correctifs pour une protection suppl\u00e9mentaire de la m\u00e9moire des processus dans l'espace utilisateur. Les d\u00e9veloppeurs se voient proposer un nouvel appel syst\u00e8me et une fonction de biblioth\u00e8que associ\u00e9e appel\u00e9e mimmutable, permettant de fixer les droits d'acc\u00e8s lors de la r\u00e9flexion dans la m\u00e9moire (memory mappings). Une fois fix\u00e9s, les droits d'acc\u00e8s d\u00e9finis pour la zone m\u00e9moire, par exemple, l'interdiction d'\u00e9criture et d'ex\u00e9cution, ne peuvent pas \u00eatre modifi\u00e9s ult\u00e9rieurement via des appels aux fonctions mmap(), mprotect() et munmap(), qui, en cas de tentative de modification, renverront une erreur EPERM. <\/p>\n

Pour g\u00e9rer la possibilit\u00e9 de modifier les droits de la m\u00e9moire r\u00e9fl\u00e9chie pour les fichiers objets, une nouvelle section Mutable BSS (.openbsd.mutable, Mutable Block Starting Symbol) a \u00e9t\u00e9 propos\u00e9e, et de nouveaux drapeaux PF_MUTABLE et UVM_ET_IMMUTABLE ont \u00e9t\u00e9 ajout\u00e9s. Le linker a \u00e9t\u00e9 mis \u00e0 jour pour prendre en charge la d\u00e9finition des sections \u00ab openbsd.mutable \u00bb et leur placement dans une zone distincte dans le BSS, align\u00e9e sur la fronti\u00e8re de la page m\u00e9moire. L'appel de la fonction mimmutable permet de marquer toutes les zones r\u00e9fl\u00e9chies comme immuables, \u00e0 l'exception des sections marqu\u00e9es comme \u00ab openbsd.mutable \u00bb. Cette nouvelle fonctionnalit\u00e9 sera disponible pour les utilisateurs dans la version OpenBSD 7.3.
\n
Source : 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 \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 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