Aucbvax.4475
fa.unix-wizards
utzoo!decvax!ucbvax!unix-wizards
Thu Oct 15 23:32:12 1981
Re: double setuid programs
>From Mike.Accetta@CMU-10A Thu Oct 15 20:34:13 1981
Mark,
setuid(geteuid()) has been allowed (in VM/UNIX at least) for as
long as I can remember. Note the second line of setuid(2) in the 4.0/1
manual:
"... These calls are only permitted to the super-user or if the
argument is the real or effective ID."
Checking back to the original 32V manual does reveal that this is
indeed not the case in 32V. I have actually used setuid(geteuid()) for
purposes similar to what you mention and have come across no problems
(a swap effective/real id call would still be nice, though).
- Mike
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