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< 1716329873 58291 :ais523!~ais523@user/ais523 JOIN #esolangs ais523 :(this is obviously not my real name)
< 1716329932 788758 :ais523!~ais523@user/ais523 PRIVMSG #esolangs :zzo38: I've seen quite a bit of discussion about CHERI recently, which is basically an architecture in which the hardware tracks which allocation each pointer is supposed to be pointing to, and enforces pointer safety rules in hardware
< 1716329944 38030 :ais523!~ais523@user/ais523 PRIVMSG #esolangs :but I'm not sure where to look to get more information about it
< 1716330010 980072 :ais523!~ais523@user/ais523 PRIVMSG #esolangs :I think the way it works is, pointers are 128 bits long (64 bits of pointer and 64 bits of allocation information), and the hardware stores extra bits in memory that mark whether a 128-bit region was created validly as a pointer value using pointer manipulation instructions, or whether it was potentially forged
< 1716330014 318146 :ais523!~ais523@user/ais523 PRIVMSG #esolangs :but I'm not sure about that either
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< 1716330598 527095 :int-e!~noone@int-e.eu PRIVMSG #esolangs :https://www.cl.cam.ac.uk/research/security/ctsrd/cheri/cheri-faq.html is a start
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> 1716332519 437708 PRIVMSG #esolangs :14[[07MakarafaC14]]4 10 02https://esolangs.org/w/index.php?diff=128556&oldid=128555 5* 03Dtp09 5* (-21) 10
< 1716333011 828668 :ais523!~ais523@user/ais523 PRIVMSG #esolangs :it has created some problems for Rust recently, because stable Rust allows programs to assume that size_t == intptr_t and that isn't true for CHERI
< 1716333062 487028 :ais523!~ais523@user/ais523 PRIVMSG #esolangs :(because 128-bit size_t seems to slow programs down really significantly)
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< 1716333198 143246 :int-e!~noone@int-e.eu PRIVMSG #esolangs :Yeah it puts the entire idea of roundtripping via an integer type into question. Like... even when you memcpy a data structure containing pointers.
< 1716333261 84975 :int-e!~noone@int-e.eu PRIVMSG #esolangs :(I haven't really read much about it. It's bound (sic!) to be addressed (sic!) in their papers.
< 1716333605 710809 :zzo38!~zzo38@host-24-207-52-143.public.eastlink.ca PRIVMSG #esolangs :For a operating system design, I had considered that such a thing would be useful. However, I should think that memcpy and copying into registers should retain the pointer information, and the actual address should be opaque (only used by the kernel; it always references a capability; ordinary pointers do not need tagged memory, only capability pointers do, so it avoids the problem with Rust described above)
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