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| author |   Konstantin Khlebnikov <khlebnikov@openvz.org> | 2012-01-05 13:04:21 +0400 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@suse.de> | 2012-01-24 13:56:10 -0800 |
| commit | 593a27c4b212e2afdf772a1f8dcb894e91bda0fa (patch) | |
| tree | 6b670f6ec0ef138fcfa6e68f3b2a456f86941efd /fs/devpts | |
| parent | Linux 3.3-rc1 (diff) | |
| download | linux-dev-593a27c4b212e2afdf772a1f8dcb894e91bda0fa.tar.xz linux-dev-593a27c4b212e2afdf772a1f8dcb894e91bda0fa.zip | |
tty: cleanup prohibition of direct opening for unix98 pty master
cleanup hack added in v2.6.27-3203-g15582d3
comment from that patch:
: pty: If the administrator creates a device for a ptmx slave we should not error
:
: The open path for ptmx slaves is via the ptmx device. Opening them any
: other way is not allowed. Vegard Nossum found that previously this was not
: the case and mknod foo c 128 42; cat foo would produce nasty diagnostics
:
: Signed-off-by: Alan Cox <alan@redhat.com>
: Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
devpts_get_tty() returns non-null only for inodes on devpts, but there is no
inodes for master-devices, /dev/ptmx (/dev/pts/ptmx) is the only way to open them.
Thus we can completely forbid lookup for master-devices and eliminate that hack in
tty_init_dev() because tty_open() will get EIO from tty_driver_lookup_tty().
Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'fs/devpts')
0 files changed, 0 insertions, 0 deletions