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To: standards@FreeBSD.org
Subject: [Bug 279560] FreeBSD 14.1 ships libc++ which passes wrong size to
sized operator delete
Date: Fri, 07 Jun 2024 18:35:25 +0000
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X-Bugzilla-Version: 14.0-RELEASE
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X-Bugzilla-Severity: Affects Many People
X-Bugzilla-Who: dim@FreeBSD.org
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D279560
--- Comment #3 from Dimitry Andric <dim@FreeBSD.org> ---
This is a bit of a false positive due to internal details of libc++
std::string.
Normally the size of a std::string is 24 bytes on amd64, but only if it
contains a 'short' string. When the contained string is too long to fit in =
the
object itself, it's reallocated on the heap instead.
In this particular case some TCMalloc test string comes out as 25 bytes, and
that is what libc++ eventually calls malloc() with. However due to internal
administration issues, it calculates the wrong size for the corresponding
delete.
This was also noticed by AddressSanitizer after
<https://github.com/llvm/llvm-project/pull/83774> ("Enable sized deallocati=
on
by default in C++14 onwards"), and fixed by Vitaly Buka in
<https://github.com/llvm/llvm-project/commit/d129ea8d2fa3>.
I will merge that fix into -CURRENT, with one prerequisite fix added, so we=
can
see if there's any fallout (but it's not likely). Then I will MFC it, and we
can think about a 14.1 erratum.
--=20
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