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| author | Eric Paris <eparis@redhat.com> | 2013-04-30 11:01:14 -0400 |
|---|---|---|
| committer | Eric Paris <eparis@redhat.com> | 2013-04-30 15:31:28 -0400 |
| commit | bde02ca858448cf54a4226774dd1481f3bcc455e (patch) | |
| tree | d5d7144d1314cba0c055b3804db35e06987a7956 /kernel/audit.c | |
| parent | 4d3fb709b285ac885c40950a837edbfc90029c5f (diff) | |
| download | lwn-bde02ca858448cf54a4226774dd1481f3bcc455e.tar.gz lwn-bde02ca858448cf54a4226774dd1481f3bcc455e.zip | |
audit: use spin_lock_irqsave/restore in audit tty code
Some of the callers of the audit tty function use spin_lock_irqsave/restore.
We were using the forced always enable version, which seems really bad.
Since I don't know every one of these code paths well enough, it makes
sense to just switch everything to the safe version. Maybe it's a
little overzealous, but it's a lot better than an unlucky deadlock when
we return to a caller with irq enabled and they expect it to be
disabled.
Signed-off-by: Eric Paris <eparis@redhat.com>
Diffstat (limited to 'kernel/audit.c')
| -rw-r--r-- | kernel/audit.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/kernel/audit.c b/kernel/audit.c index 44803f25b236..241aa8593fa8 100644 --- a/kernel/audit.c +++ b/kernel/audit.c @@ -804,10 +804,11 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh) case AUDIT_TTY_GET: { struct audit_tty_status s; struct task_struct *tsk = current; + unsigned long flags; - spin_lock_irq(&tsk->sighand->siglock); + spin_lock_irqsave(&tsk->sighand->siglock, flags); s.enabled = tsk->signal->audit_tty != 0; - spin_unlock_irq(&tsk->sighand->siglock); + spin_unlock_irqrestore(&tsk->sighand->siglock, flags); audit_send_reply(NETLINK_CB(skb).portid, seq, AUDIT_TTY_GET, 0, 0, &s, sizeof(s)); @@ -816,6 +817,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh) case AUDIT_TTY_SET: { struct audit_tty_status *s; struct task_struct *tsk = current; + unsigned long flags; if (nlh->nlmsg_len < sizeof(struct audit_tty_status)) return -EINVAL; @@ -823,9 +825,9 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh) if (s->enabled != 0 && s->enabled != 1) return -EINVAL; - spin_lock_irq(&tsk->sighand->siglock); + spin_lock_irqsave(&tsk->sighand->siglock, flags); tsk->signal->audit_tty = s->enabled != 0; - spin_unlock_irq(&tsk->sighand->siglock); + spin_unlock_irqrestore(&tsk->sighand->siglock, flags); break; } default: |