- Cache a reference to the credential of the thread that starts a ktrace in

  struct proc as p_tracecred alongside the current cache of the vnode in
  p_tracep.  This credential is then used for all later ktrace operations on
  this file rather than using the credential of the current thread at the
  time of each ktrace event.
- Now that we have multiple ktrace-related items in struct proc that are
  pointers, rename p_tracep to p_tracevp to make it less ambiguous.

Requested by:	rwatson (1)

1 files changed, 7 insertions, 2 deletions

diff --git a/sys/kern/kern_exit.c b/sys/kern/kern_exit.c
index 22dba08..168900f 100644
--- a/sys/kern/kern_exit.c
+++ b/sys/kern/kern_exit.c
@@ -135,6 +135,7 @@ exit1(td, rv)
 	struct vnode *vtmp;
 #ifdef KTRACE
 	struct vnode *tracevp;
+	struct ucred *tracecred;
 #endif
 
 	GIANT_REQUIRED;
@@ -359,12 +360,16 @@ exit1(td, rv)
 	PROC_LOCK(p);
 	mtx_lock(&ktrace_mtx);
 	p->p_traceflag = 0;	/* don't trace the vrele() */
-	tracevp = p->p_tracep;
-	p->p_tracep = NULL;
+	tracevp = p->p_tracevp;
+	p->p_tracevp = NULL;
+	tracecred = p->p_tracecred;
+	p->p_tracecred = NULL;
 	mtx_unlock(&ktrace_mtx);
 	PROC_UNLOCK(p);
 	if (tracevp != NULL)
 		vrele(tracevp);
+	if (tracecred != NULL)
+		crfree(tracecred);
 #endif
 	/*
 	 * Release reference to text vnode