[Bug 268479] lib/libc/stdlib/getenv.c may have a problem with putenv()

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=268479

--- Comment #11 from Mark Millard <[email protected]> ---
(In reply to Mark Millard from comment #10)

Among other poor wordings of mine, "hw.machine and
hw.machine_arch from the booted kernel" is unclear
about the supported architectures handling, such as
for:

# sysctl hw.model
hw.model: ARM Cortex-A72 r0p3

# sysctl kern.supported_archs
kern.supported_archs: aarch64 armv7

Booted as aarch64, a chroot or jail can be a native/hardware armv7
for that model. sysctl's hw.machine and hw.machine_arch will report
arm and armv7 in such a chroot or jail.

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