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Reverse of a coin: A short note on segment alignment

herm1t
Electrical Ordered Freedom #2 (EOF-DR-RRLF)
October 2007

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Abstract

One of the widely used method of ELF files infection was propposed by Silvio Cesare [1]. To inject the virus to a file the free space at the end of text segment, appeared as a result of alignment is used. Alignment is neccessary to prevent the beginning of the data segment and the end of text segment from ending up in the same page. The "hole" in the memory exist no only in the end of text segment, but also at the beginning of data segment:

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