{"title":"MetaTableLite: An Efficient Metadata Management Scheme for Tagged-Pointer-Based Spatial Safety","authors":"Dongwei Chen, Dong Tong, Chun Yang, Xu Cheng","doi":"10.1109/ICCD53106.2021.00042","DOIUrl":null,"url":null,"abstract":"A tagged-pointer-based memory spatial safety protection system utilizes the unused bits in a pointer to store the boundary information of an object. This paper proposed a hybrid metadata management scheme, MetaTableLite, for tagged-pointer-based protections. We observed that objects of a large size only take a minority part of all the objects in a program. However, recording their boundary metadata with traditional pointer tags will incur large memory overheads. Based on this observation, we introduce a small supplementary table to maintain metadata for these few large objects. For small ones, MetaTableLite represents their boundaries with a 14-bit pointer tag, well utilizing the unused 16 bits in a conventional 64-bit pointer. MetaTableLite can achieve a 6% average memory overhead without alternating the conventional pointer representation.","PeriodicalId":154014,"journal":{"name":"2021 IEEE 39th International Conference on Computer Design (ICCD)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2021 IEEE 39th International Conference on Computer Design (ICCD)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/ICCD53106.2021.00042","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 1
Abstract
A tagged-pointer-based memory spatial safety protection system utilizes the unused bits in a pointer to store the boundary information of an object. This paper proposed a hybrid metadata management scheme, MetaTableLite, for tagged-pointer-based protections. We observed that objects of a large size only take a minority part of all the objects in a program. However, recording their boundary metadata with traditional pointer tags will incur large memory overheads. Based on this observation, we introduce a small supplementary table to maintain metadata for these few large objects. For small ones, MetaTableLite represents their boundaries with a 14-bit pointer tag, well utilizing the unused 16 bits in a conventional 64-bit pointer. MetaTableLite can achieve a 6% average memory overhead without alternating the conventional pointer representation.
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