[RFC PATCH] malloc_usable_size.3: Warn about _FORTIFY_SOURCE interaction

[Mingye Wang <arthur200126@xxxxxxxxx>]

Hi all,

In (somewhat) recent discussions about _FORTIFY_SOURCE level 3, a
common snag to hit seems to be abuse of malloc_usable_size(). The
attached patch is my attempt at making the situation easier to sort
through.

See siddhesh's comment on GitHub.[0] I wonder if the language needs to
be stronger.
  [0]: https://github.com/systemd/systemd/issues/22801#issuecomment-1343041481

Best,
Mingye Wang (Artoria2e5)

Attachment: 0001-malloc_usable_size.3-Warn-about-_FORTIFY_SOURCE-inte.patch
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