Poul-Henning Kamp 9c71cb4bef Even if the permissions deny it, a process should be allowed to ... access its controlling terminal. In essense, history dictates that any process is allowed to open /dev/tty for RW, irrespective of credential, because by definition it is it's own controlling terminal. Before DEVFS we relied on a hacky half-device thing (kern/tty_tty.c) which did the magic deep down at device level, which at best was disgusting from an architectural point of view. My first shot at this was to use the cloning mechanism to simply give people the right tty when they ask for /dev/tty, that's why you get this, slightly counter intuitive result: syv# ls -l /dev/tty `tty` crw--w---- 1 u1 tty 5, 0 Jan 13 22:14 /dev/tty crw--w---- 1 u1 tty 5, 0 Jan 13 22:14 /dev/ttyp0 Trouble is, when user u1 su(1)'s to user u2, he cannot open /dev/ttyp0 anymore because he doesn't have permission to do so. The above fix allows him to do that. The interesting side effect is that one was previously only able to access the controlling tty by indirection: date > /dev/tty but not by name: date > `tty` This is now possible, and that feels a lot more like DTRT. PR: 46635 MFC candidate: could be.		2003-01-13 22:20:36 +00:00
..
cd9660	Temporarily introduce a new VOP_SPECSTRATEGY operation while I try	2003-01-04 22:10:36 +00:00
coda	Back our kernel support for reliable signal queues.	2002-10-01 17:15:53 +00:00
deadfs	Fix comments and one resulting code confusion about the type of the	2002-10-16 08:04:11 +00:00
devfs	Even if the permissions deny it, a process should be allowed to	2003-01-13 22:20:36 +00:00
fdescfs	Bow to the whining masses and change a union back into void *. Retain	2003-01-13 00:33:17 +00:00
fifofs	Bow to the whining masses and change a union back into void *. Retain	2003-01-13 00:33:17 +00:00
hpfs	Temporarily introduce a new VOP_SPECSTRATEGY operation while I try	2003-01-04 22:10:36 +00:00
msdosfs	Temporarily introduce a new VOP_SPECSTRATEGY operation while I try	2003-01-04 22:10:36 +00:00
ntfs	Since Jeffr made the std* functions the default in rev 1.63 of	2003-01-04 08:47:19 +00:00
nullfs	Fix typos, mostly s/ an / a / where appropriate and a few s/an/and/	2002-12-30 21:18:15 +00:00
nwfs	Since Jeffr made the std* functions the default in rev 1.63 of	2003-01-04 08:47:19 +00:00
portalfs	Bow to the whining masses and change a union back into void *. Retain	2003-01-13 00:33:17 +00:00
procfs	Slightly change the semantics of vnode labels for MAC: rather than	2002-10-26 14:38:24 +00:00
pseudofs	Since Jeffr made the std* functions the default in rev 1.63 of	2003-01-04 08:47:19 +00:00
smbfs	Since Jeffr made the std* functions the default in rev 1.63 of	2003-01-04 08:47:19 +00:00
specfs	Don't override the vop_lock, vop_unlock and vop_isunlocked methods.	2003-01-05 19:14:44 +00:00
udf	Temporarily introduce a new VOP_SPECSTRATEGY operation while I try	2003-01-04 22:10:36 +00:00
umapfs	umap_sync is empty and is identical to vfs_stdsync. Remove it and	2002-10-19 22:22:42 +00:00
unionfs	Bow to the whining masses and change a union back into void *. Retain	2003-01-13 00:33:17 +00:00