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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>
This commit is contained in:
Oleg Nesterov 2009-04-29 16:02:24 +02:00 committed by James Morris
parent 3bcac0263f
commit ecd6de3c88
1 changed files with 3 additions and 8 deletions
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11
security/selinux/hooks.c
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@ -2371,10 +2371,8 @@ static void selinux_bprm_committed_creds(struct linux_binprm *bprm)
{
const struct task_security_struct *tsec = current_security();
struct itimerval itimer;
struct sighand_struct *psig;
u32 osid, sid;
int rc, i;
unsigned long flags;
osid = tsec->osid;
sid = tsec->sid;
@ -2405,12 +2403,9 @@ static void selinux_bprm_committed_creds(struct linux_binprm *bprm)
/* Wake up the parent if it is waiting so that it can recheck
* wait permission to the new task SID. */
read_lock_irq(&tasklist_lock);
psig = current->parent->sighand;
spin_lock_irqsave(&psig->siglock, flags);
wake_up_interruptible(&current->parent->signal->wait_chldexit);
spin_unlock_irqrestore(&psig->siglock, flags);
read_unlock_irq(&tasklist_lock);
read_lock(&tasklist_lock);
wake_up_interruptible(&current->real_parent->signal->wait_chldexit);
read_unlock(&tasklist_lock);
}
/* superblock security operations */