From 3e7cd6c413c9e6fbb5e1ee2acdadb4ababd2d474 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Mon, 12 Feb 2007 00:52:58 -0800 Subject: [PATCH] pid: replace is_orphaned_pgrp with is_current_pgrp_orphaned Every call to is_orphaned_pgrp passed in process_group(current) which is racy with respect to another thread changing our process group. It didn't bite us because we were dealing with integers and the worse we would get would be a stale answer. In switching the checks to use struct pid to be a little more efficient and prepare the way for pid namespaces this race became apparent. So I simplified the calls to the more specialized is_current_pgrp_orphaned so I didn't have to worry about making logic changes to avoid the race. Signed-off-by: Eric W. Biederman Cc: Alan Cox Cc: Oleg Nesterov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/char/n_tty.c | 2 +- drivers/char/tty_io.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) (limited to 'drivers/char') diff --git a/drivers/char/n_tty.c b/drivers/char/n_tty.c index 2bdb0144a22..c035c2f1f46 100644 --- a/drivers/char/n_tty.c +++ b/drivers/char/n_tty.c @@ -1188,7 +1188,7 @@ static int job_control(struct tty_struct *tty, struct file *file) printk("read_chan: tty->pgrp <= 0!\n"); else if (process_group(current) != tty->pgrp) { if (is_ignored(SIGTTIN) || - is_orphaned_pgrp(process_group(current))) + is_current_pgrp_orphaned()) return -EIO; kill_pg(process_group(current), SIGTTIN, 1); return -ERESTARTSYS; diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c index 95f3596189c..94070f7bf38 100644 --- a/drivers/char/tty_io.c +++ b/drivers/char/tty_io.c @@ -1118,7 +1118,7 @@ int tty_check_change(struct tty_struct * tty) return 0; if (is_ignored(SIGTTOU)) return 0; - if (is_orphaned_pgrp(process_group(current))) + if (is_current_pgrp_orphaned()) return -EIO; (void) kill_pg(process_group(current), SIGTTOU, 1); return -ERESTARTSYS; -- cgit v1.2.3