Messages in this thread | | | Subject | Re: [PATCH] bug in setpgid()? process groups and thread groups | From | Alan Cox <> | Date | 02 Aug 2003 21:51:24 +0100 |
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On Sad, 2003-08-02 at 20:08, Roland McGrath wrote: > The problem exists with uids/gids as well, in the sense that they are > changed per-thread but POSIX semantics are that setuid et al affect the > whole process (i.e. all threads in a thread group). I emphatically agree > that this should be changed, and I hope we can get it done in 2.6.
There are two reasons the uid/gid stuff can't change.
#1 Lots of non posix afflicted intelligent programmers use the per thread uid stuff in daemons. Its really really useful
#2 Linux fundamentally assumes your security credentials don't change mid syscall except in the specific calls we intend to.
#2 is not sanely soluble for 2.6, and of questionable value anyway, #1 is a very good reason for making libc fix up this obscure posix stupidity itself.
Lets face it how many posix pthreads app have -performance critical setuid/getid calls ?
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