Na vers\u00e3o Fedora Linux 45, programada para o outono de 2026, ser\u00e1 inclu\u00eddo por padr\u00e3o o uso de pilha sombra (shadow stack) em sistemas x86_64 para bloquear a opera\u00e7\u00e3o de exploits que reescrevem o endere\u00e7o de retorno das fun\u00e7\u00f5es em caso de estouro de buffer na pilha. A prote\u00e7\u00e3o ser\u00e1 ativada para todos os aplicativos e bibliotecas compilados com os compiladores gcc (C, C++), clang (C, C++) e rustc (Rust). O plano ainda n\u00e3o foi aprovado pelo comit\u00ea FESCo (Fedora Engineering Steering Committee), respons\u00e1vel pela parte t\u00e9cnica do desenvolvimento do Fedora Linux. O incentivo para a inclus\u00e3o da pilha sombra no Fedora vem de Arjun Shankar, da Red Hat, que mant\u00e9m os pacotes com glibc no Fedora e RHEL.<\/p>\n
A prote\u00e7\u00e3o \u00e9 implementada utilizando os recursos de hardware dos processadores e se resume ao fato de que, ap\u00f3s a transmiss\u00e3o do controle para a fun\u00e7\u00e3o, os endere\u00e7os de retorno s\u00e3o salvos pelo processador n\u00e3o apenas na pilha convencional, mas tamb\u00e9m em uma pilha separada chamada \"pilha sombra\", que n\u00e3o pode ser alterada diretamente. Antes de sair da fun\u00e7\u00e3o, o endere\u00e7o de retorno \u00e9 extra\u00eddo da pilha sombra e comparado com o endere\u00e7o de retorno da pilha principal. A discrep\u00e2ncia entre os endere\u00e7os resulta na gera\u00e7\u00e3o de uma exce\u00e7\u00e3o, bloqueando situa\u00e7\u00f5es em que um exploit conseguiu sobrescrever o endere\u00e7o na pilha principal. O mecanismo de pilha sombra \u00e9 suportado a partir da 11\u00aa gera\u00e7\u00e3o de processadores Intel (\"Tiger Lake\" e \"Rocket Lake\") e da microarquitetura Zen3 nos processadores AMD. \u0412 \u0432\u044b\u043f\u0443\u0441\u043a\u0435 Fedora Linux 45, \u043d\u0430\u043c\u0435\u0447\u0435\u043d\u043d\u043e\u043c \u043d\u0430 \u043e\u0441\u0435\u043d\u044c 2026 \u0433\u043e\u0434\u0430, \u043d\u0430 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445 x86_64 \u043f\u043b\u0430\u043d\u0438\u0440\u0443\u044e\u0442 \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u0432\u043a\u043b\u044e\u0447\u0438\u0442\u044c \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u0442\u0435\u043d\u0435\u0432\u043e\u0433\u043e \u0441\u0442\u0435\u043a\u0430 (shadow stack) \u0434\u043b\u044f \u0431\u043b\u043e\u043a\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0440\u0430\u0431\u043e\u0442\u044b \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442\u043e\u0432, \u043f\u0435\u0440\u0435\u0437\u0430\u043f\u0438\u0441\u044b\u0432\u0430\u044e\u0449\u0438\u0445 \u0430\u0434\u0440\u0435\u0441 \u0432\u043e\u0437\u0432\u0440\u0430\u0442\u0430 \u0444\u0443\u043d\u043a\u0446\u0438\u0439 \u0432 \u0441\u043b\u0443\u0447\u0430\u0435 \u043f\u0435\u0440\u0435\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0431\u0443\u0444\u0435\u0440\u0430 \u0432 \u0441\u0442\u0435\u043a\u0435. \u0417\u0430\u0449\u0438\u0442\u0443 \u043d\u0430\u043c\u0435\u0440\u0435\u043d\u044b \u0430\u043a\u0442\u0438\u0432\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u0434\u043b\u044f \u0432\u0441\u0435\u0445 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0439 \u0438 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a, \u0441\u043e\u0431\u0440\u0430\u043d\u043d\u044b\u0445 \u043f\u0440\u0438 \u043f\u043e\u043c\u043e\u0449\u0438 \u043a\u043e\u043c\u043f\u0438\u043b\u044f\u0442\u043e\u0440\u043e\u0432 gcc (C, C++), clang (C, C++) \u0438 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-182435","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 Fedora 45, pretende-se incluir prote\u00e7\u00e3o baseada em pilha sombra | ProHoster","description":"Na vers\u00e3o Fedora Linux 45, programada para o outono de 2026, ser\u00e1 inclu\u00eddo por padr\u00e3o o uso de pilha sombra (shadow stack) para bloquear a opera\u00e7\u00e3o de exploits que reescrevem o 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Fonte: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"