{"id":34721,"date":"2019-10-31T22:00:00","date_gmt":"2019-10-31T19:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/plany-po-usileniyu-mehanizma-zashhity-w-x-v-openbsd\/"},"modified":"2019-10-31T22:00:00","modified_gmt":"2019-10-31T19:00:00","slug":"plany-po-usileniyu-mehanizma-zashhity-w-x-v-openbsd","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sq\/blog\/novosti-interneta\/plany-po-usileniyu-mehanizma-zashhity-w-x-v-openbsd","title":{"rendered":"Planet p\u00ebr p\u00ebrmir\u00ebsimin e mekanizmit t\u00eb mbrojtjes W^X n\u00eb OpenBSD","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Theo De Raadt <noindex><a rel=\"nofollow\" href=\"https:\/\/marc.info\/?l=openbsd-tech&#038;m=155899373514678&#038;w=2\">ndau<\/a><\/noindex> planet p\u00ebr forcimin e mekanizmit t\u00eb mbrojtjes s\u00eb memories W^X (Write XOR Execute). Thelbi i mekanizmit \u00ebsht\u00eb se faqet e memories s\u00eb procesit nuk mund t\u00eb jen\u00eb nj\u00ebkoh\u00ebsisht t\u00eb aksesueshme p\u00ebr shkrim dhe ekzekutim. K\u00ebshtu, kodi mund t\u00eb ekzekutohet vet\u00ebm pas ndalimit t\u00eb shkrimit, dhe shkrimi n\u00eb faqe t\u00eb memories \u00ebsht\u00eb i mundur vet\u00ebm pas ndalimit t\u00eb ekzekutimit. Mekanizmi W^X ndihmon n\u00eb mbrojtjen e aplikacioneve n\u00eb hap\u00ebsir\u00ebn e p\u00ebrdoruesit nga sulmet tipike q\u00eb kryhen p\u00ebrmes mbushjes s\u00eb tampon\u00ebve, p\u00ebrfshir\u00eb mbushjet e stack-ut dhe \u00ebsht\u00eb aktiv n\u00eb OpenBSD <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=44506\">n\u00eb m\u00ebnyr\u00eb default<\/a><\/noindex>.<\/p>\n<p>Q\u00eb n\u00eb fillim t\u00eb pun\u00ebs mbi W^X, ishte e qart\u00eb se kjo \u00ebsht\u00eb nj\u00eb rrug\u00eb e gjat\u00eb, pasi ekziston nj\u00eb num\u00ebr i konsideruesh\u00ebm aplikacionesh q\u00eb p\u00ebrdorin JIT. Zbatimet e JIT mund t\u00eb ndahen n\u00eb tri kategori:<\/p>\n<ul>\n<li class=\"l\"> Ndryshimi i memories midis shteteve W dhe X, duke u pajtuar me \"koston\" e thirrjes sistemore <noindex><a rel=\"nofollow\" href=\"https:\/\/man.openbsd.org\/mprotect.2\">mprotect<\/a><\/noindex>.\n<li class=\"l\"> Krijimi i alias\u00ebve midis nj\u00eb \u00e7ifti W dhe X t\u00eb kartelave t\u00eb memories s\u00eb nj\u00ebjt\u00eb.\n<li class=\"l\"> Varianti m\u00eb \"i ndotur\" - modelet e memories W|X, q\u00eb lejojn\u00eb t\u00eb b\u00ebhet nj\u00ebkoh\u00ebsisht shkrimi dhe ekzekutimi.\n<\/ul>\n<p>Aktualisht, numri i programeve q\u00eb p\u00ebrdorin variantin e tret\u00eb ka r\u00ebn\u00eb ndjesh\u00ebm, nd\u00ebrsa jan\u00eb rritur p\u00ebrdorimet e par\u00eb dhe t\u00eb dyt\u00eb. Megjithat\u00eb, p\u00ebr shkak se ishte e nevojshme t\u00eb niste edhe programe me W|X JIT (kryesisht, Chromium dhe Iridum), u shtua nj\u00eb opsion p\u00ebr t\u00eb montuar sistemin e skedar\u00ebve \"wxallowed\", q\u00eb lejonte p\u00ebrdorimin e memories p\u00ebr shkrim dhe ekzekutim nj\u00ebkoh\u00ebsisht, n\u00ebse skedari ekzekutiv ELF sh\u00ebnohej me amanetin \"wxneeded\", nd\u00ebrsa aplikacionet e veta mbroheshin p\u00ebr m\u00eb tep\u00ebr duke p\u00ebrdorur mekanizmat. <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=43295\">pledge<\/a><\/noindex> dhe <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=49042\">unveil<\/a><\/noindex> p\u00ebr t\u00eb kufizuar list\u00ebn e thirrjeve t\u00eb sistemit t\u00eb p\u00ebrdorura dhe pjes\u00ebt e sistemit t\u00eb skedar\u00ebve t\u00eb aksesueshme p\u00ebr aplikacionin p\u00ebrkat\u00ebs.<\/p>\n<p>P\u00ebr t\u00eb komplikuar m\u00eb tej shfryt\u00ebzimin e vulnerabiliteteve n\u00eb aplikacione t\u00eb tilla, \u00ebsht\u00eb propozuar nj\u00eb shtes\u00eb e mekanizmit <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=48243\">MAP_STACK<\/a><\/noindex>, e cila kontrollon n\u00ebse thirrja e sistemit kryhet nga nj\u00eb faqe memory e aksesueshme p\u00ebr shkrim. N\u00ebse faqja \u00ebsht\u00eb e aksesueshme p\u00ebr shkrim, procesi p\u00ebrfundohet me forc\u00eb. K\u00ebshtu, nj\u00eb sulmues nuk do t\u00eb jet\u00eb n\u00eb gjendje t\u00eb p\u00ebrdor\u00eb thirrjet e sistemit dhe do t\u00eb jet\u00eb i detyruar t\u00eb provoj\u00eb t\u00eb gjej\u00eb gjysm\u00eb-pjes\u00ebt e nevojshme n\u00eb zbatimin e JIT ose madje t\u00eb kryej\u00eb pun\u00eb m\u00eb t\u00eb v\u00ebshtir\u00eb p\u00ebr t\u00eb zbuluar z\u00ebvend\u00ebsimet e thirrjeve t\u00eb sistemit drejtp\u00ebrdrejt brenda <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=44320\">libc gjithashtu t\u00eb lidhur rast\u00ebsisht<\/a><\/noindex>. <\/p>\n<p>Proceset Chrome\/Iridium jan\u00eb mjaft t\u00eb mbrojtura me ndihm\u00ebn e pledge dhe unveil, por ndalimi i p\u00ebrdorimit, p\u00ebr shembull, t\u00eb thirrjes s\u00eb sistemit write(2), ka disa p\u00ebrfitime, pasi krijon v\u00ebshtir\u00ebsi shtes\u00eb p\u00ebr sulmuesin. Megjithat\u00eb, v\u00ebshtir\u00ebsit\u00eb mund t\u00eb shfaqen edhe n\u00eb rast se zbatimi i JIT p\u00ebrdor thirrjet natyrale t\u00eb sistemit nga memoria W|X. Megjithat\u00eb, ka arsye p\u00ebr t\u00eb shpresuar q\u00eb me nj\u00eb gj\u00eb t\u00eb till\u00eb nuk do t\u00eb p\u00ebrballemi, pasi ABI ka ndryshuar shpesh, por askush nuk ka raportuar ndonj\u00ebher\u00eb p\u00ebr probleme.<\/p>\n<p>Ndryshimet tashm\u00eb jan\u00eb t\u00eb disponueshme n\u00eb snapshotet e rregullta t\u00eb deg\u00ebs OpenBSD-CURRENT, t\u00eb gjith\u00eb ata q\u00eb jan\u00eb t\u00eb interesuar ftohen t\u00eb testojn\u00eb.<\/p>\n<p>Nj\u00eb koment i ve\u00e7ant\u00eb nga Theo meritohet edhe lidhur me lajmet mbi shfaqjen n\u00eb Chrome\/Iridium t\u00eb modit <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=50559\">JITless<\/a><\/noindex>. Nga pik\u00ebpamja e tij, kjo \u00ebsht\u00eb e pranueshme p\u00ebr disa modele p\u00ebrdorimi, megjithat\u00eb ndoshta jo p\u00ebr t\u00eb gjitha, sepse n\u00eb k\u00ebt\u00eb mod \u00ebsht\u00eb evident rritja e ngarkes\u00ebs n\u00eb procesor. Tani Chrome do t\u00eb funksionoj\u00eb kryesisht, n\u00ebse \"wxallowed\" \u00ebsht\u00eb \u00e7aktivizuar p\u00ebr \/usr\/local, megjithat\u00eb ka probleme me disa shtesa (si\u00e7 \u00ebsht\u00eb ghostery). Si\u00e7 do t\u00eb jet\u00eb, Theo shpreson q\u00eb funksionimi i plot\u00eb n\u00eb m\u00ebnyr\u00ebn JITless t\u00eb arrij\u00eb nj\u00eb gjendje plot\u00ebsisht funksionale n\u00eb t\u00eb ardhmen e af\u00ebrt.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Burimi: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=50763\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0422\u0435\u043e \u0414\u0435 \u0420\u0430\u0430\u0434\u0442 \u043f\u043e\u0434\u0435\u043b\u0438\u043b\u0441\u044f \u043f\u043b\u0430\u043d\u0430\u043c\u0438 \u043f\u043e \u0443\u0441\u0438\u043b\u0435\u043d\u0438\u044e \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c\u0430 \u0437\u0430\u0449\u0438\u0442\u044b \u043f\u0430\u043c\u044f\u0442\u0438 W^X (Write XOR Execute). \u0421\u0443\u0442\u044c \u043c\u0435\u0445\u043d\u0438\u0437\u043c\u0430 \u0432 \u0442\u043e\u043c, \u0447\u0442\u043e \u0441\u0442\u0440\u0430\u043d\u0438\u0446\u044b \u043f\u0430\u043c\u044f\u0442\u0438 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0430 \u043d\u0435 \u043c\u043e\u0433\u0443\u0442 \u0431\u044b\u0442\u044c \u043e\u0434\u043d\u043e\u0432\u0440\u0435\u043c\u0435\u043d\u043d\u043e \u0434\u043e\u0441\u0442\u0443\u043f\u043d\u044b \u043d\u0430 \u0437\u0430\u043f\u0438\u0441\u044c \u0438 \u0438\u0441\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435. \u0422\u0430\u043a\u0438\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c, \u043a\u043e\u0434 \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u0438\u0441\u043f\u043e\u043b\u043d\u0435\u043d \u0442\u043e\u043b\u044c\u043a\u043e \u043f\u043e\u0441\u043b\u0435 \u0437\u0430\u043f\u0440\u0435\u0449\u0435\u043d\u0438\u044f \u0437\u0430\u043f\u0438\u0441\u0438, \u0430 \u0437\u0430\u043f\u0438\u0441\u044c \u0432 \u0441\u0442\u0440\u0430\u043d\u0438\u0446\u0443 \u043f\u0430\u043c\u044f\u0442\u0438 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u0430 \u0442\u043e\u043b\u044c\u043a\u043e \u043f\u043e\u0441\u043b\u0435 \u0437\u0430\u043f\u0440\u0435\u0442\u0430 \u0438\u0441\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f. \u041c\u0435\u0445\u0430\u043d\u0438\u0437\u043c W^X \u043f\u043e\u043c\u043e\u0433\u0430\u0435\u0442 \u0437\u0430\u0449\u0438\u0442\u0438\u0442\u044c [&hellip;]<\/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-34721","post","type-post","status-publish","format-standard","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0422\u0435\u043e \u0414\u0435 \u0420\u0430\u0430\u0434\u0442 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