[Bug 15679] tls curve secp256r1 (aka P256) miscomiples on x86_64

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=15679

Denys Vlasenko <vda.linux at googlemail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
            Summary|wget with amazon.com fails  |tls curve secp256r1 (aka
                   |with TLS handshake failure  |P256) miscomiples on x86_64
                   |on Debian 12                |
             Status|NEW                         |RESOLVED

--- Comment #3 from Denys Vlasenko <vda.linux at googlemail.com> ---
commit 67ec1f8cd1051354d2af1b9a793fa5968b0d54ad (HEAD -> master)
Date:   Thu Jul 11 23:48:53 2024 +0200

    tls: P256: fix obscure x86_64 asm misbehavior, closes 15679

    gcc does not necessarily clear upper bits in
    64-bit regs if you ask it to load a 32-bit constant.

    Cast it to unsigned long. Better yet, hand-write loading
    of the constant with a smaller instruction.

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