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id="aglg2"><button id="aglg2"></button></tbody></div> <script type="text/javascript">s("header");</script> <div id="kz5jjfn0" class="side_header"> <div id="kz5jjfn0" class="side_box"> <div id="kz5jjfn0" class="indexwidth"> <a target="_blank" title="優(yōu)文網(wǎng)" href="http://www.oriental01.com/" class="logo"></a> <span id="kz5jjfn0" class="lanmu">計(jì)算機(jī)論文</span> <div id="kz5jjfn0" class="sidebar"><a href='http://www.oriental01.com/' title='優(yōu)文網(wǎng)'>優(yōu)文網(wǎng)</a><code>></code><a href='http://www.oriental01.com/lunwen/' title='畢業(yè)論文'>畢業(yè)論文</a><code>></code><a href='http://www.oriental01.com/lunwen/jisuanji/' title='計(jì)算機(jī)論文'>計(jì)算機(jī)論文</a><code>></code> 基于RT-Linux防危保障機(jī)制的實(shí)驗(yàn)?zāi)Ｐ?/div> <div id="kz5jjfn0" class="search"> </div> <div id="kz5jjfn0" class="rougao"> <a target="_blank" href="http://www.oriental01.com/usr/login.html" title="我要投稿">我要投稿</a> <a target="_blank" href="http://www.oriental01.com/contact.html" class="jianyi" 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<p>基于RT-Linux防危保障機(jī)制的實(shí)驗(yàn)?zāi)Ｐ?/p><strong>摘要：</strong>隨著嵌入式實(shí)時系統(tǒng)在安全關(guān)鍵系統(tǒng)中日益廣泛的應(yīng)用，其軟件不但要保護(hù)嵌放式實(shí)時系統(tǒng)的功能性和時間限制，對其安全性、穩(wěn)定性和可靠性的要求也大大提高。軟件錯誤的比例大大高于硬件錯誤，軟件錯誤可能引起硬件誤操作，進(jìn)而直接威脅系統(tǒng)安全。使用防危核可有效防止關(guān)鍵設(shè)備誤操作。本文以RT-Linux實(shí)時操作系統(tǒng)為平臺，對十字路口交通燈控制建立安全實(shí)驗(yàn)?zāi)Ｐ停布牢：藢?shí)現(xiàn)技術(shù)，為防危保障探索新的實(shí)現(xiàn)途徑。 <p> <b>關(guān)鍵詞：</b>防危核安全核實(shí)時系統(tǒng) 防危策略</p> <p>早在19世紀(jì)70年代，為保證系統(tǒng)中的敏感信息不被非法用戶惡意破壞和非法訪問，Roger Schell和Mitre等人提出了安全核（security kernel）的概念。安全核將系統(tǒng)中的軟件隔離為可信的和不可信的兩部分，由可信賴信號負(fù)責(zé)對不可信部分進(jìn)行審核，以保證不可信部分不會對敏感數(shù)據(jù)進(jìn)行非法和錯誤的訪問。安全核的技術(shù)在信息安全領(lǐng)域中取得了成功并得到廣泛的應(yīng)用。在安全核基礎(chǔ)上，Rushby等人又進(jìn)一步提出了防危核（safety kernel）的概念，用于防止軟件對安全關(guān)鍵設(shè)備的非法訪問，從而保障系統(tǒng)安全。防危核由一組防危策略和隔離組成，因此，防危策略的完備性和低開銷是防隱核可靠和高效的關(guān)鍵�，F(xiàn)在，對防危核的研究還處于初級階段，本文介紹我們基于RT-Linux實(shí)現(xiàn)的隊(duì)危核。實(shí)驗(yàn)結(jié)果表明了該方案的有效性和可行性。</p> <p><b>1 防危核技術(shù)</b></p> <p>防危核關(guān)心的是如何保護(hù)設(shè)備不被非法訪問，以避免因?qū)υO(shè)備的誤操作引起的重大生命財(cái)產(chǎn)損失和環(huán)境破壞。防危核把受保護(hù)設(shè)備與系統(tǒng)中的其它部分隔離，通過實(shí)施防危策略（safety policy）對這些設(shè)備的訪問進(jìn)行特殊控制。凡是對受保護(hù)設(shè)備的訪問，都必須經(jīng)過危核的審查，合法者予以支持；反之，則采取相應(yīng)的出錯處理措施，維護(hù)系統(tǒng)的防危特性，這樣就能很好地避免軟件故障造成的災(zāi)難后果。從應(yīng)用軟件的角度來看，防危核的原理如圖1所示。在工程應(yīng)用中，要保證危核的有效性，必須遵循下列3項(xiàng)規(guī)則。</p> <p>（1）短小精練</p> <p>為了不影響系統(tǒng)的性能，防危核應(yīng)盡可能小，為此系統(tǒng)所有的防危核策略均由防危核為實(shí)施是不現(xiàn)實(shí)的。采用將防危策略放在防危核外部的防危策略庫中的方法，縮小防危核的大小主，防危核在防危處理時訪問防危策略庫，以獲取相應(yīng)防危策略。</p> <p>（2）完備性</p> <p>完備性要求，不通過防危核主體就不能對客體進(jìn)行任何訪問操作。它表明對設(shè)備的任何訪問請求都必須通過防危核的驗(yàn)證。如果系統(tǒng)中存在其它組件可以繞開防危核訪問設(shè)備，顯然安全將無法得到保障。所以采用了防危核技術(shù)的系統(tǒng)必須要保證防危核對設(shè)備的專一控制。</p> <p><b>[1] [2] [3] [4] [5] [6] </b></p><script>s("content_relate");</script><p>【基于RT-Linux防危保障機(jī)制的實(shí)驗(yàn)?zāi)Ｐ汀肯嚓P(guān)文章：</p><p><a target="_blank" href="http://www.oriental01.com/lunwenzhaiyao/jiaoyujiaoxuelunwen/20100729143000_358804.html" 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