n_tty: Lock access to tty->pgrp for POSIX job control

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Concurrent access to tty->pgrp must be protected with tty->ctrl_lock.
Also, as noted in the comments, reading current->signal->tty is
safe because either,
  1) current->signal->tty is assigned by current, or
  2) current->signal->tty is set to NULL.

NB: for reference, tty_check_change() implements a similar POSIX
check for the ioctls corresponding to tcflush(), tcdrain(),
tcsetattr(), tcsetpgrp(), tcflow() and tcsendbreak().

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Peter Hurley 2013-03-06 08:38:20 -05:00 • committed by Greg Kroah-Hartman

parent 8c985d18b1

commit 01a5e440c9

1 changed files with 18 additions and 16 deletions

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drivers/tty/n_tty.c

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