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selinux: selinux_bprm_committed_creds() should wake up ->real_parent, not ->parent.
We shouldn't worry about the tracer if current is ptraced, exec() must not succeed if the tracer has no rights to trace this task after cred changing. But we should notify ->real_parent which is, well, real parent. Also, we don't need _irq to take tasklist, and we don't need parent's ->siglock to wake_up_interruptible(real_parent->signal->wait_chldexit). Since we hold tasklist, real_parent->signal must be stable. Otherwise spin_lock(siglock) is not safe too and can't help anyway. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: James Morris <jmorris@namei.org>
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@ -2371,10 +2371,8 @@ static void selinux_bprm_committed_creds(struct linux_binprm *bprm)
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{
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const struct task_security_struct *tsec = current_security();
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struct itimerval itimer;
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struct sighand_struct *psig;
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u32 osid, sid;
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int rc, i;
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unsigned long flags;
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osid = tsec->osid;
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sid = tsec->sid;
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@ -2405,12 +2403,9 @@ static void selinux_bprm_committed_creds(struct linux_binprm *bprm)
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/* Wake up the parent if it is waiting so that it can recheck
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* wait permission to the new task SID. */
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read_lock_irq(&tasklist_lock);
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psig = current->parent->sighand;
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spin_lock_irqsave(&psig->siglock, flags);
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wake_up_interruptible(¤t->parent->signal->wait_chldexit);
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spin_unlock_irqrestore(&psig->siglock, flags);
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read_unlock_irq(&tasklist_lock);
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read_lock(&tasklist_lock);
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wake_up_interruptible(¤t->real_parent->signal->wait_chldexit);
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read_unlock(&tasklist_lock);
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}
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/* superblock security operations */
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