[Bug string/23196] __mempcpy_avx512_no_vzeroupper mishandles large copies (CVE-2018-11237)

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=23196

--- Comment #8 from Florian Weimer <fweimer at redhat dot com> ---
(In reply to rschiron from comment #7)
> While looking at the proposed patch, I was wondering: why is %rax needed at
> all?

It's the return value of the function and the difference between memcpy and
mempcpy.

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