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SELinux: hold tasklist_lock and siglock while waking wait_chldexit

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SELinux has long been calling wake_up_interruptible() on
current->parent->signal->wait_chldexit without holding any locks.  It
appears that this operation should hold the tasklist_lock to dereference
current->parent and we should hold the siglock when waking up the
signal->wait_chldexit.

Signed-off-by: Eric Paris <eparis@redhat.com>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
Eric Paris 2008-11-04 15:18:26 -05:00 committed by James Morris
parent 8b6a5a37f8
commit 41d9f9c524
1 changed files with 7 additions and 0 deletions
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7
security/selinux/hooks.c
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@ -2268,7 +2268,9 @@ static void selinux_bprm_post_apply_creds(struct linux_binprm *bprm)
struct rlimit *rlim, *initrlim;
struct itimerval itimer;
struct bprm_security_struct *bsec;
struct sighand_struct *psig;
int rc, i;
unsigned long flags;
tsec = current->security;
bsec = bprm->security;
@ -2335,7 +2337,12 @@ static void selinux_bprm_post_apply_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);
}
/* superblock security operations */