Set `sysctl vm.mmap_min_addr=65536`

[raja-grewal]

This pull request sets sysctl vm.mmap_min_addr=65536 as per the KSPP recommendations .

Changes

Set sysctl vm.mmap_min_addr=65536.

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[adrelanos]

Where is the number 65536 coming from? Could you document this in the PR please?

[raja-grewal]

Sure, the 64KB size comes from the current recommendation from the KSPP:

# Disallow allocating the first 64k of memory.
CONFIG_DEFAULT_MMAP_MIN_ADDR=65536

This is also highlighted in the commit.