[PATCH] SELinux: add security hook call to kill_proc_info_as_uid

This patch adds a call to the extended security_task_kill hook introduced by
the prior patch to the kill_proc_info_as_uid function so that these signals
can be properly mediated by security modules.  It also updates the existing
hook call in check_kill_permission.

Signed-off-by: David Quigley <dpquigl@tycho.nsa.gov>
Signed-off-by: James Morris <jmorris@namei.org>
Cc: Stephen Smalley <sds@tycho.nsa.gov>
Cc: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/linux/sched.h

@@ -1153,7 +1153,7 @@ extern int force_sig_info(int, struct siginfo *, struct task_struct *);
 extern int __kill_pg_info(int sig, struct siginfo *info, pid_t pgrp);
 extern int kill_pg_info(int, struct siginfo *, pid_t);
 extern int kill_proc_info(int, struct siginfo *, pid_t);
-extern int kill_proc_info_as_uid(int, struct siginfo *, pid_t, uid_t, uid_t);
+extern int kill_proc_info_as_uid(int, struct siginfo *, pid_t, uid_t, uid_t, u32);
 extern void do_notify_parent(struct task_struct *, int);
 extern void force_sig(int, struct task_struct *);
 extern void force_sig_specific(int, struct task_struct *);

kernel/signal.c

@@ -584,7 +584,7 @@ static int check_kill_permission(int sig, struct siginfo *info,
 	    && !capable(CAP_KILL))
 		return error;
 
-	error = security_task_kill(t, info, sig);
+	error = security_task_kill(t, info, sig, 0);
 	if (!error)
 		audit_signal_info(sig, t); /* Let audit system see the signal */
 	return error;
@@ -1107,7 +1107,7 @@ kill_proc_info(int sig, struct siginfo *info, pid_t pid)
 
 /* like kill_proc_info(), but doesn't use uid/euid of "current" */
 int kill_proc_info_as_uid(int sig, struct siginfo *info, pid_t pid,
-		      uid_t uid, uid_t euid)
+		      uid_t uid, uid_t euid, u32 secid)
 {
 	int ret = -EINVAL;
 	struct task_struct *p;
@@ -1127,6 +1127,9 @@ int kill_proc_info_as_uid(int sig, struct siginfo *info, pid_t pid,
 		ret = -EPERM;
 		goto out_unlock;
 	}
+	ret = security_task_kill(p, info, sig, secid);
+	if (ret)
+		goto out_unlock;
 	if (sig && p->sighand) {
 		unsigned long flags;
 		spin_lock_irqsave(&p->sighand->siglock, flags);