{"id":121343,"date":"2025-01-15T09:46:00","date_gmt":"2025-01-15T07:46:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/v-gotovyashhemsya-v-relizu-yadre-linux-6-13-vyyavlen-sboj-vyzvannyj-kodom-sotrudnika-microsoft"},"modified":"2025-01-15T09:46:00","modified_gmt":"2025-01-15T07:46:00","slug":"v-gotovyashhemsya-v-relizu-yadre-linux-6-13-vyyavlen-sboj-vyzvannyj-kodom-sotrudnika-microsoft","status":"publish","type":"post","link":"https:\/\/prohoster.info\/fr\/blog\/news\/v-gotovyashhemsya-v-relizu-yadre-linux-6-13-vyyavlen-sboj-vyzvannyj-kodom-sotrudnika-microsoft","title":{"rendered":"Un bogue provoqu\u00e9 par le code d'un employ\u00e9 de Microsoft a \u00e9t\u00e9 d\u00e9tect\u00e9 dans le noyau Linux 6.13 en pr\u00e9paration pour la sortie.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Linus Torvalds pr\u00e9voyait de publier la version du noyau Linux 6.13 ce dimanche, mais il est probable que les tests de la branche 6.13 soient prolong\u00e9s d'une semaine en raison de probl\u00e8mes de stabilit\u00e9 li\u00e9s aux modifications pr\u00e9par\u00e9es par un employ\u00e9 de Microsoft et int\u00e9gr\u00e9es \u00e0 la branche 6.13 en novembre. De plus, il est not\u00e9 que le patch \u00e0 l'origine de l'\u00e9chec a \u00e9t\u00e9 soumis de mani\u00e8re non standard \u2014 mais a \u00e9t\u00e9 accept\u00e9, bien qu'il n'ait re\u00e7u aucune confirmation (ACK) de la part des mainteneurs de l'architecture x86, ce qui constitue une violation des pratiques habituelles. <\/p>\n

Le correctif ajoutait la possibilit\u00e9 d'utiliser de grandes pages de m\u00e9moire en mode ROX (Read Only Execute) lors de l'allocation de m\u00e9moire destin\u00e9e \u00e0 accueillir du code ex\u00e9cutable. Le mode ROX permet d'utiliser la m\u00e9moire contenant du code ex\u00e9cutable en mode seulement lecture, rendant plus difficile l'exploitation de certaines vuln\u00e9rabilit\u00e9s. Dans le noyau 6.13, l'utilisation du cache de grandes pages ex\u00e9cutables en m\u00e9moire pour le code ex\u00e9cutable des modules sur les syst\u00e8mes x86_64 \u00e9tait activ\u00e9e par d\u00e9faut et refl\u00e9tait le mode ROX. Ce changement r\u00e9solvait le probl\u00e8me de mappage en mode ROX des pages pour du code ex\u00e9cutable encore en cours de formation et permettait d'\u00e9viter le remappage temporaire des pages ROX en mode \u00e9criture jusqu'\u00e0 ce que la pr\u00e9paration des modules du noyau soit termin\u00e9e. <\/p>\n

\u00c0 l'\u00e9tape finale des tests du noyau 6.13, un ing\u00e9nieur de chez Intel a identifi\u00e9 un bug emp\u00eachant le noyau de sortir correctement du mode veille sur certains ordinateurs portables \u00e9quip\u00e9s de processeurs Intel (par exemple, avec un CPU bas\u00e9 sur l'architecture Alder Lake). Le bug se manifestait lors de la compilation du noyau avec le compilateur Clang, lorsque le mode de protection CFI (Control Flow Integrity) \u00e9tait activ\u00e9, emp\u00eachant les violations de l'ordre normal d'ex\u00e9cution (control flow) dues \u00e0 l'utilisation d'exploits modifiant les pointeurs de fonction stock\u00e9s en m\u00e9moire. Comme solution temporaire, les mainteneurs des entreprises Intel et AMD, responsables de l'architecture x86, ont propos\u00e9 de d\u00e9sactiver l'utilisation d'EXECMEM_ROX dans le noyau 6.13, jusqu'\u00e0 ce qu'un correctif complet soit pr\u00e9par\u00e9 et test\u00e9 (la premi\u00e8re option de correction n'a pas r\u00e9solu le probl\u00e8me).
\n
Source : opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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