Also, even with perfect randomization, leakage of memory contents will help to calculate the base address of a DLL at runtime.
22.
Switching execution contexts could be done in a single instruction merely by setting a different base address in a single register.
23.
However, one can choose the index of the first element by an appropriate choice of the base address " B ".
24.
Position-independent executable ( PIE ) implements a random base address for the main executable binary and has been in place since 2003.
25.
Due to the court order, that address temporarily didn't work, but the site remained accessible at its true subdomain-based address the whole time.
26.
Each reentrant module accessed program data through a single memory " base address ", which was different for each instance of run data.
27.
Under this type of scheme, the base address is the lowest numbered address within a prescribed range, to facilitate adding related positive-valued offsets.
28.
While methods exist to " harden " mailto links against harvesting address munging and JavaScript-based address web forms, which experience similar challenges with preventing spam.
29.
But if there's a DNS failure, a Web surfer must enter the IP address to get to the site; the usual word-based address becomes useless.
30.
To this could be added an index byte ( specifying the index register and 5-bit base address ), and up to 2 variable-length displacements per operand.
