From 71ccd7528fa4380b146e71040d9bc246f8a5d82b Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Thu, 18 Jul 2024 21:08:34 -0400
Subject: kernel: exit: Drop loadmap entries with bad range

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 sys/kern/kern_exit.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/sys/kern/kern_exit.c b/sys/kern/kern_exit.c
index 3f8f17e..d109725 100644
--- a/sys/kern/kern_exit.c
+++ b/sys/kern/kern_exit.c
@@ -56,6 +56,11 @@ unload_td(struct proc *td)
         range = &execp->loadmap[i];
         len = (range->end - range->start);
 
+        /* Drop entries with zeroed range */
+        if (range->start == 0 && range->end == 0) {
+            continue;
+        }
+
         /* Attempt to unmap the range */
         if (vm_unmap(pcbp->addrsp, range->vbase, len) != 0) {
             pr_error("Failed to unmap %p - %p (pid=%d)\n",
-- 
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