The Unix user ID concepts and file system access bits cause
_considerable_ confusion among new users.
Not true at all, most new users don't even need to care about uid's or
file system access bits. I don't even care about them on a daily
basis.
I have seen this confusion, and it is justified ("execute" allows
me to enter a directory???)
That is a silly argument, make a GUI that prints a message "enter
directory?" when something is a directory, and "execute file?" when it
is a file.
There are plenty of perfectly traditional systems that implement
POSIX.
And one of them is the GNU system, the one people here wish to write a
decent kernel for.
I don't see a way to start with POSIX and then improve it from
there. POSIX has inherent insecurities built in. There are not
many, but [...]
So simply ignore those insecuritites.
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