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As reuniões de um grupo de trabalho do Brasil e dos Estados Unidos para discutir as questões climáticas começam nesta segunda-feira (25), informou o ministro da Fazenda, Fernando Haddad. A autorização para o início foi dada nesta semana pelo presidente americano, Joe Biden, em reunião bilateral com o governo brasileiro em Nova York. Assista ao Jornal da Manhã completo: https://youtube.com/live/kRGjtuFSCjo

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Inter Miami’s star man, Lionel Messi, may be missing for their U.S. Open Cup final on Wednesday.

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Hello, for those one or two people interested in rubidity – a it’s just ruby version with 100%-compatible solidity types and abis – i updated the rubidity-typed gem that’s the foundation with with “zero-dependency” typed value and reference classes. it’s still (very) early. if anyone is interested in typed ruby (at runtime only; no static type-checker) i invite you to join the fun and let’s explore and learn together.

Theo de Raadt (deraadt@) posted to
tech@
a detailed
message
explaining the past and (potential) future of
anti-ROP
measures in OpenBSD.

It’s well worth reading its entirety.
Highlights include:

Years later, Todd Mortimer and I developed RETGUARD.  At the start of
that initiative he proposed we protect all functions, to try to guard
all the RET instructions, and therefore achieve a state we call
"ROP-free".  I felt this was impossible, but after a couple hurdles the
RETGUARD performance was vastly better than the stack protector and we
were able to protect all functions and get to ROP-free (on fixed-sized
instruction architecures).  Performance was acceptable to trade against
improved security.
[…]
We were able to enable RETGUARD on all functions because it was fast.
[…]
On the other hand the RETGUARD approach uses an illegal instruction (of
some sort), which is a speculation barrier. That prevents the cpu from
heading off into an alternative set of weeds.  It will go decode more
instructions along the post-RET execution path.

I filed that idea as interesting but did nothing with it.  Until now.

Like we said earlier, it is worth reading the whole thing! This points forward to some remarkable improvements on several architectures, and those changes could be a clear benefit for other systems too.