diff options
| author | Alan Cox <alan@lxorguk.ukuu.org.uk> | 2006-09-29 11:01:41 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-09-29 18:18:25 +0200 |
| commit | eb84a20e9e6b98dcb33023ad22241d79107a08a7 (patch) | |
| tree | 4971aef730cc3a1917463afe1dbb381dea664e99 /kernel/acct.c | |
| parent | [PATCH] Fix locking for tty drivers when doing urgent characters (diff) | |
| download | linux-eb84a20e9e6b98dcb33023ad22241d79107a08a7.tar.xz linux-eb84a20e9e6b98dcb33023ad22241d79107a08a7.zip | |
[PATCH] audit/accounting: tty locking
Add tty locking around the audit and accounting code.
The whole current->signal-> locking is all deeply strange but it's for
someone else to sort out. Add rather than replace the lock for acct.c
Signed-off-by: Alan Cox <alan@redhat.com>
Acked-by: Arjan van de Ven <arjan@linux.intel.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/acct.c')
| -rw-r--r-- | kernel/acct.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/kernel/acct.c b/kernel/acct.c index 2a7c933651c7..f4330acead46 100644 --- a/kernel/acct.c +++ b/kernel/acct.c @@ -483,10 +483,14 @@ static void do_acct_process(struct file *file) ac.ac_ppid = current->parent->tgid; #endif - read_lock(&tasklist_lock); /* pin current->signal */ + mutex_lock(&tty_mutex); + /* FIXME: Whoever is responsible for current->signal locking needs + to use the same locking all over the kernel and document it */ + read_lock(&tasklist_lock); ac.ac_tty = current->signal->tty ? old_encode_dev(tty_devnum(current->signal->tty)) : 0; read_unlock(&tasklist_lock); + mutex_unlock(&tty_mutex); spin_lock_irq(¤t->sighand->siglock); ac.ac_utime = encode_comp_t(jiffies_to_AHZ(cputime_to_jiffies(pacct->ac_utime))); |