ubsan/overflow: Enable ignorelist parsing and add type filter

Limit integer wrap-around mitigation to only the "size_t" type (for
now). Notably this covers all special functions/builtins that return

ubsan/overflow: Enable ignorelist parsing and add type filter

Limit integer wrap-around mitigation to only the "size_t" type (for
now). Notably this covers all special functions/builtins that return
"size_t", like sizeof(). This remains an experimental feature and is
likely to be replaced with type annotations.

Reviewed-by: Justin Stitt <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Kees Cook <[email protected]>

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