排序方式: 共有94条查询结果,搜索用时 15 毫秒
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传统的验证平台编写复杂,且难以在不同设计之间重用。采用SystemVerilog支持的VMM验证方法学,并结合带约束的随机验证和覆盖率驱动的验证技术,构建可重用验证平台,完成对UART模块的验证。与直接测试方法相比,该验证平台不仅能够有效提高验证效率,而且在模块级和系统级验证过程中,能够重用该验证平台或验证组件。 相似文献
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Security tools are rapidly developed as network security threat is becoming more and more serious. To overcome the fundamental limitation of traditional host based anti malware system which is likely to be deceived and attacked by malicious codes, VMM based anti malware systems have recently become a hot research field. In this article, the existing malware hiding technique is analyzed, and a detecting model for hidden process based on “In VM” idea is also proposed. Based on this detecting model, a hidden process detection technology which is based on HOOK SwapContext on the VMM platform is also implemented successfully. This technology can guarantee the detecting method not to be attacked by malwares and also resist all the current process hiding technologies. In order to detect the malwares which use remote injection method to hide themselves, a method by hijacking sysenter instruction is also proposed. Experiments show that the proposed methods guarantee the isolation of virtual machines, can detect all malware samples, and just bring little performance loss. 相似文献
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针对虚拟化环境下Guest OS某些特定指令行为不会产生陷入从而在虚拟机管理器(virtual machine monitor,VMM)中无法对其进行监控处理的问题,提出通过改变非陷入指令正常运行条件,使其执行非法产生系统异常陷入VMM的思想;据此就x86架构下Guest OS中3种非陷入系统调用指令在VMM中的截获与识别进行研究:其中基于int和sysenter指令的系统调用通过使其产生通用保护(general protection,GP)错系统异常而陷入,基于syscall指令的系统调用则通过使其产生UD(undefined)未定义指令系统异常而陷入,之后VMM依据虚拟处理器上下文现场信息对其进行识别;基于QemuKvm实现的原型系统表明:上述方法能成功截获并识别出Guest OS中所有3种系统调用行为,正常情况下其性能开销也在可接受的范围之内,如在unixbench的shell测试用例中,其性能开销比在1.900~2.608之间.与现有方法相比,它们都是以体系结构自身规范为基础,因此具有无需修改Guest OS、跨平台透明的优势. 相似文献
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Internet远程控制系统 总被引:7,自引:0,他引:7
Internet网络系统中一类特殊的管理系统--远程控制系统,以其新颖引人入胜,但也因此可能会带来许多意想不到的结果。本文对其进行了比较详细的剖析,共同行参考。 相似文献
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