cvs commit: src ObsoleteFiles.inc src/libexec Makefile
src/libexec/pt_chown Makefile pt_chown.c
rwatson at FreeBSD.org
Sun Aug 24 15:45:31 UTC 2008
On Sun, 24 Aug 2008, Ed Schouten wrote:
> Remove the now unneeded pt_chown utility.
> Before we had a posix_openpt() that allocated PTY's with proper
> permissions in place, we used this set-uid utility to change the
> ownership of PTY slave devices to the real user ID of the process. This
> utility was used to implement grantpt().
> In my first designs of the MPSAFE TTY layer, I replaced this by adding
> an ioctl() called TIOCGRANTPT, which was used to change the ownership.
> I left the pt_chown utility, because older C libraries needed it to work
> After some discussions back in June I changed the PTY code to set
> permissions properly upon creation. Fortunately the previous grantpt()
> implementation changed permissions by hand when pt_chown is not
> installed, which always succeeds. This means grantpt() still works
> properly, even though the set-uid utility is missing.
> I've done tests with FreeBSD 5.2.1, FreeBSD 6.3 and FreeBSD 7.0 jails.
> All of them still work if I remove pt_chown.
I know, another e-mail from me about compatibility -- run away!
Do you plan to provide updated compat libs for 4.x, 5.x, 6.x, 7.x, to replace
libc/libutil code that expects to be able to execute the pt_chown binary?
What happens if that code can't find the pt_chown binary it expects?
Robert N M Watson
University of Cambridge
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