{"id":6657,"date":"2026-04-13T11:50:50","date_gmt":"2026-04-13T11:50:50","guid":{"rendered":"http:\/\/the-codest.localhost\/dictionary\/stack-pointer\/"},"modified":"2026-04-13T11:50:50","modified_gmt":"2026-04-13T11:50:50","slug":"stapapegur","status":"publish","type":"dictionary","link":"https:\/\/thecodest.co\/is\/dictionary\/stack-pointer\/","title":{"rendered":"St\u00f6kkv\u00edsir"},"content":{"rendered":"

St\u00f6kkv\u00edsir<\/h1>\n

Staplasti\u00f0inn er mikilv\u00e6gur hluti t\u00f6lvubyggingar sem s\u00e9r um a\u00f0 stj\u00f3rna staflanum. g\u00f6gn<\/a> uppbygging. Stakkurinn er minnisv\u00e6\u00f0i sem t\u00f6lvuforrit nota til a\u00f0 geyma t\u00edmabundin g\u00f6gn, svo sem ramma fallakalla, sta\u00f0bundnar breytur og skilarheftir. Stakkbendillinn er skr\u00e1 sem geymir minnisheiti efstu st\u00f6\u00f0u stakkans, sem er s\u00e1 sta\u00f0ur \u00fear sem n\u00e6sti hlutur ver\u00f0ur settur inn \u00ed e\u00f0a tekinn \u00far stakkanum.<\/p>\n

Stapapegillinn er venjulega innleiddur sem s\u00e9rh\u00e6ft skr\u00e1arskr\u00e1 \u00ed \u00f6rgj\u00f6rvanum sem st\u00fdrikerfi\u00f0 og \u00fe\u00fd\u00f0andinn nota til a\u00f0 stj\u00f3rna stapanum. \u00deegar fall er kalla\u00f0 er stapapegillinn nota\u00f0ur til a\u00f0 \u00fathluta pl\u00e1ssi \u00e1 stapanum fyrir sta\u00f0bundnar breytur fallsins og til a\u00f0 geyma skilarheiti\u00f0. \u00deegar falli\u00f0 skilar gildum er stapapegillinn nota\u00f0ur til a\u00f0 losa stappassann og endurheimta fyrri \u00e1stand forritsins.<\/p>\n

Stack-v\u00edsirinn er mikilv\u00e6gur \u00fe\u00e1ttur \u00ed t\u00f6lv\u00f6ryggi, \u00fear sem hann er oft nota\u00f0ur til a\u00f0 misnota veikleika \u00ed hugb\u00fana\u00f0i. Til d\u00e6mis byggja staflagrundvallar buffer overflow-\u00e1r\u00e1sir \u00e1 \u00fev\u00ed a\u00f0 skrifa yfir skilarheiti\u00f0 \u00e1 staflanum til a\u00f0 beina framkv\u00e6mdar\u00e1fl\u00e6\u00f0i forritsins til illgjarns k\u00f3\u00f0a. k\u00f3\u00f0i<\/a>. Til a\u00f0 koma \u00ed veg fyrir sl\u00edk \u00e1r\u00e1sir innlei\u00f0a n\u00fat\u00edma st\u00fdrikerfi og \u00fe\u00fd\u00f0endur \u00fdmsar \u00f6ryggisr\u00e1\u00f0stafanir, svo sem stack-kanar\u00edur, tilviljunarkennda skipulagningu minnisfangar\u00fdmis (ASLR) og \u00f3framkv\u00e6manlegt minni (NX), sem gera \u00fea\u00f0 erfi\u00f0ara fyrir \u00e1r\u00e1sara\u00f0ila a\u00f0 misnota veikleika \u00ed stafla.<\/p>\n

\u00cd stuttu m\u00e1li er staflagrunnv\u00edsir grundvallarhugtak \u00ed t\u00f6lvunarfr\u00e6\u00f0i sem gegnir lykilhlutverki vi\u00f0 a\u00f0 stj\u00f3rna staflagrunns gagnal\u00edkani og tryggja \u00f6ryggi t\u00f6lvukerfa. A\u00f0 skilja hvernig staflagrunnv\u00edsirinn virkar er nau\u00f0synlegt fyrir hugb\u00fana\u00f0ar\u00fer\u00f3unara\u00f0ilar<\/a>, kerfisstj\u00f3rar og \u00f6ryggiss\u00e9rfr\u00e6\u00f0ingar sem vinna me\u00f0 l\u00e1gu stigi forritunarm\u00e1l<\/a> og st\u00fdrikerfi.<\/p>","protected":false},"excerpt":{"rendered":"

Kynntu \u00fe\u00e9r stafl v\u00edsirinn, mikilv\u00e6gan hluta t\u00f6lvubyggingar sem st\u00fdrir stafl-gagnastr\u00fakt\u00farnum og tryggir \u00f6ryggi t\u00f6lvukerfa.<\/p>","protected":false},"template":"","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"class_list":["post-6657","dictionary","type-dictionary","status-publish","hentry"],"acf":[],"yoast_head":"\nStack Pointer - The Codest<\/title>\n<meta name=\"description\" content=\"Learn about the stack pointer, a crucial component of computer architecture that manages the stack data structure and ensures the security of computer systems.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/thecodest.co\/is\/ordabok\/stapapegur\/\" \/>\n<meta property=\"og:locale\" content=\"is_IS\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Stack Pointer\" \/>\n<meta property=\"og:description\" content=\"Learn about the stack pointer, a crucial component of computer architecture that manages the stack data structure and ensures the security of computer systems.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/thecodest.co\/is\/ordabok\/stapapegur\/\" \/>\n<meta property=\"og:site_name\" content=\"The Codest\" \/>\n<meta property=\"og:image\" content=\"https:\/\/thecodest.co\/app\/uploads\/2024\/06\/cover-image.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"675\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/thecodest.co\\\/dictionary\\\/stack-pointer\\\/\",\"url\":\"https:\\\/\\\/thecodest.co\\\/dictionary\\\/stack-pointer\\\/\",\"name\":\"Stack Pointer - 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