- Change fill_kinfo_proc() to require that the process is locked when it

  is called.
- Change sysctl_out_proc() to require that the process is locked when it
  is called and to drop the lock before it returns.  If this proves too
  complex we can change sysctl_out_proc() to simply acquire the lock at
  the very end and have the calling code drop the lock right after it
  returns.
- Lock the process we are going to export before the p_cansee() in the
  loop in sysctl_kern_proc() and hold the lock until we call
  sysctl_out_proc().
- Don't call p_cansee() on the process about to be exported twice in
  the aforementioned loop.

1 files changed, 2 insertions, 0 deletions

diff --git a/sys/kern/imgact_aout.c b/sys/kern/imgact_aout.c
index 77d6905..41ae8cf 100644
--- a/sys/kern/imgact_aout.c
+++ b/sys/kern/imgact_aout.c
@@ -263,7 +263,9 @@ aout_coredump(td, vp, limit)
 	if (ctob((UAREA_PAGES + KSTACK_PAGES)
 	    + vm->vm_dsize + vm->vm_ssize) >= limit)
 		return (EFAULT);
+	PROC_LOCK(p);
 	fill_kinfo_proc(p, &p->p_uarea->u_kproc);
+	PROC_UNLOCK(p);
 	error = cpu_coredump(td, vp, cred);
 	if (error == 0)
 		error = vn_rdwr(UIO_WRITE, vp, vm->vm_daddr,