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Switch away from pointer arithmetic to provide more obvious semantics
for checking overlap on pointer ranges. This lets us remove some casts
that need not exist and removes some possible fragility in its use.
While we're here, check for overflow just in case; sometimes we use a
caller-supplied size if __builtin_object_size(3) can't deduce the buffer
size, and we should fail the check if the size is nonsensical for the
provided buffers.
Reviewed by: markj
Sponsored by: Klara, Inc.
Sponsored by: Stormshield
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We'll be using it in some upcoming definitions in headers, so move it
back now but slap a warning on it. Our upcoming uses will all be inside
of inline functions, so we're not overly concerned about double
evaluation immediately.
Reviewed by: markj
Sponsored by: Klara, Inc.
Sponsored by: Stormshield
Differential Revision: https://reviews.freebsd.org/D45677
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This is a mostly-unmodified copy of the various *_chk implementations
and headers from NetBSD, without yet modifying system headers to start
actually including them. A future commit will also apply the needed
bits to fix ssp/unistd.h.
Reviewed by: imp, pauamma_gundo.com (both previous versions), kib
Sponsored by: Stormshield
Sponsored by: Klara, Inc.
Differential Revision: https://reviews.freebsd.org/D32306
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