diff options
| author |   Eric W. Biederman <ebiederm@xmission.com> | 2007-02-12 00:52:58 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-02-12 09:48:32 -0800 |
| commit | 3e7cd6c413c9e6fbb5e1ee2acdadb4ababd2d474 (patch) | |
| tree | de97d00794ee0c787b6c551a91e33fb1faa48caa | |
| parent | [PATCH] pid: use struct pid for talking about process groups in exitc (diff) | |
| download | linux-dev-3e7cd6c413c9e6fbb5e1ee2acdadb4ababd2d474.tar.xz linux-dev-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>
| -rw-r--r-- | drivers/char/n_tty.c | 2 | ||||
| -rw-r--r-- | drivers/char/tty_io.c | 2 | ||||
| -rw-r--r-- | include/linux/tty.h | 2 | ||||
| -rw-r--r-- | kernel/exit.c | 4 | ||||
| -rw-r--r-- | kernel/signal.c | 2 |
5 files changed, 6 insertions, 6 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; diff --git a/include/linux/tty.h b/include/linux/tty.h index 0a10a4e7bbc3..d0e03c4a71b1 100644 --- a/include/linux/tty.h +++ b/include/linux/tty.h @@ -303,7 +303,7 @@ extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp, int buflen); extern void tty_write_message(struct tty_struct *tty, char *msg); -extern int is_orphaned_pgrp(int pgrp); +extern int is_current_pgrp_orphaned(void); extern int is_ignored(int sig); extern int tty_signal(int sig, struct tty_struct *tty); extern void tty_hangup(struct tty_struct * tty); diff --git a/kernel/exit.c b/kernel/exit.c index 407b80aaefda..f132349c0325 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -229,12 +229,12 @@ static int will_become_orphaned_pgrp(struct pid *pgrp, struct task_struct *ignor return ret; /* (sighing) "Often!" */ } -int is_orphaned_pgrp(int pgrp) +int is_current_pgrp_orphaned(void) { int retval; read_lock(&tasklist_lock); - retval = will_become_orphaned_pgrp(find_pid(pgrp), NULL); + retval = will_become_orphaned_pgrp(task_pgrp(current), NULL); read_unlock(&tasklist_lock); return retval; diff --git a/kernel/signal.c b/kernel/signal.c index de66def71644..a9b679ed795c 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -1909,7 +1909,7 @@ relock: /* signals can be posted during this window */ - if (is_orphaned_pgrp(process_group(current))) + if (is_current_pgrp_orphaned()) goto relock; spin_lock_irq(¤t->sighand->siglock); |