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i#5085 vsys hook: Pass full vdso size to mprotect

Merged Derek Bruening requested to merge i5085-vdso-hook into master

Fixes a failure to insert the vsyscall hook by passing the full size of the VDSO to mprotect, as recent kernels refuse to split the region.

Tested on an Ubuntu20 VM where the hook was observed to now succeed with this fix.

Fixes #5085 (closed)