From 35cc0ad861e12382d22bce773db664e0f59e7648 Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Thu, 10 Jul 2025 03:22:29 -0400
Subject: kernel: exit: Clear out file descriptors on reap

Ensure all file descriptors are freed and their respective vnodes
released.

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 sys/kern/kern_exit.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/sys/kern/kern_exit.c b/sys/kern/kern_exit.c
index a4bf0f9..b1bd9ba 100644
--- a/sys/kern/kern_exit.c
+++ b/sys/kern/kern_exit.c
@@ -31,6 +31,8 @@
 #include <sys/sched.h>
 #include <sys/syslog.h>
 #include <sys/panic.h>
+#include <sys/filedesc.h>
+#include <sys/vnode.h>
 #include <vm/physmem.h>
 #include <vm/dynalloc.h>
 #include <vm/vm.h>
@@ -83,9 +85,23 @@ void
 proc_reap(struct proc *td)
 {
     struct pcb *pcbp;
+    struct filedesc *fdp;
     vaddr_t stack_va;
     paddr_t stack_pa;
 
+    /* Clear out all fds */
+    for (size_t i = 4; i < PROC_MAX_FILEDES; ++i) {
+        fdp = td->fds[i];
+        if (fdp == NULL) {
+            continue;
+        }
+        if (fdp->refcnt == 1) {
+            vfs_release_vnode(fdp->vp);
+            dynfree(fdp);
+            fdp = NULL;
+        }
+    }
+
     pcbp = &td->pcb;
     unload_td(td);
 
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