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| author | Peter Hurley <peter@hurleysoftware.com> | 2016-01-09 22:55:29 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-01-27 16:41:04 -0800 |
| commit | f229c2c161de94a404fa16a17cb93c4a06938af5 (patch) | |
| tree | d99d57f3008d56c391bd85691850d2087d270ec8 /drivers/tty/tty_audit.c | |
| parent | a75c9b091226c0062a498d1cb65f9f6b858ebe55 (diff) | |
| download | linux-stable-f229c2c161de94a404fa16a17cb93c4a06938af5.tar.gz linux-stable-f229c2c161de94a404fa16a17cb93c4a06938af5.tar.bz2 linux-stable-f229c2c161de94a404fa16a17cb93c4a06938af5.zip | |
tty: audit: Take siglock directly
lock_task_sighand() is for situations where the struct task_struct*
may disappear while trying to deref the sighand; this never applies
to 'current'.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/tty_audit.c')
| -rw-r--r-- | drivers/tty/tty_audit.c | 13 |
1 files changed, 5 insertions, 8 deletions
diff --git a/drivers/tty/tty_audit.c b/drivers/tty/tty_audit.c index 9effa81acdfc..5f65653cee48 100644 --- a/drivers/tty/tty_audit.c +++ b/drivers/tty/tty_audit.c @@ -180,22 +180,19 @@ void tty_audit_tiocsti(struct tty_struct *tty, char ch) int tty_audit_push_current(void) { struct tty_audit_buf *buf = ERR_PTR(-EPERM); - struct task_struct *tsk = current; unsigned long flags; - if (!lock_task_sighand(tsk, &flags)) - return -ESRCH; - - if (tsk->signal->audit_tty) { - buf = tsk->signal->tty_audit_buf; + spin_lock_irqsave(¤t->sighand->siglock, flags); + if (current->signal->audit_tty) { + buf = current->signal->tty_audit_buf; if (buf) atomic_inc(&buf->count); } - unlock_task_sighand(tsk, &flags); + spin_unlock_irqrestore(¤t->sighand->siglock, flags); /* * Return 0 when signal->audit_tty set - * but tsk->signal->tty_audit_buf == NULL. + * but current->signal->tty_audit_buf == NULL. */ if (!buf || IS_ERR(buf)) return PTR_ERR(buf); |