diff options
| author | Eric W. Biederman <ebiederm@xmission.com> | 2007-02-12 09:52:58 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-02-12 18:48:32 +0100 |
| commit | 3e7cd6c413c9e6fbb5e1ee2acdadb4ababd2d474 (patch) | |
| tree | de97d00794ee0c787b6c551a91e33fb1faa48caa /drivers | |
| parent | [PATCH] pid: use struct pid for talking about process groups in exitc (diff) | |
| download | linux-3e7cd6c413c9e6fbb5e1ee2acdadb4ababd2d474.tar.xz linux-3e7cd6c413c9e6fbb5e1ee2acdadb4ababd2d474.zip | |
[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 <ebiederm@xmission.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/char/n_tty.c | 2 | ||||
| -rw-r--r-- | drivers/char/tty_io.c | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/drivers/char/n_tty.c b/drivers/char/n_tty.c index 2bdb0144a22e..c035c2f1f462 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 95f3596189cf..94070f7bf389 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; |