[Bug nptl/22850] Harden TCB against stack protector bypass via overwrite of stack_guard

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=22850

--- Comment #5 from Florian Weimer <fweimer at redhat dot com> ---
AArch64 uses a regular global data symbol to store the reference value. This
requires an additional indirection (longer dependency chain, potential wasted
cache line). It's an improvement from a security perspective, but has its
downsides.

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