TIL another awful thing about Linux procfs behavior; top-level /proc only reports processes (thread-groups) via getdents/readdir, but opening /proc/$tid where $tid is any thread id (not necessarily also a process id) succeeds.
Yep, I'm aware of the historical "let's make ps suid-root" awfulness of the BSDs. It was actually one of my turn-offs to BSD when first getting acquainted with Linux and FOSS. When was it finally fixed?
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Just imagine trying to convince someone back then that retpolines are a good idea. Attacks are now micro-architectural.
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We couldn’t even have noexec /tmp and stacks were all executable until we got the NX bit circa ~2000. Unless you had a “big-iron” UNIX machine with an MMU with RWX in its PTEs.
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I don’t know. It dates back to the time when you could trust other nodes on the Internet, and services had no auth, before things like cleattext auth in pop3. You needed a local account for mail and uucp, sendmail and nntp all ran as root. sendmail had no authentication.
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