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[PATCH] audit/accounting: tty locking

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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 <[email protected]>
Acked-by: Arjan van de Ven <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Alan Cox 2006-09-29 02:01:41 -07:00 • committed by Linus Torvalds
commit eb84a20e9e
2 changed files with 10 additions and 1 deletions
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6
kernel/acct.c
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@ -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(&current->sighand->siglock);
ac.ac_utime = encode_comp_t(jiffies_to_AHZ(cputime_to_jiffies(pacct->ac_utime)));