From 52e7fe3c679469032e77a5ca4adf19618ba1201b Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Tue, 24 Jan 2023 18:49:58 +0100
Subject: kernel/procfs: prevent reading kernel memory

knew it
---
 src/kernel/vfs/procfs.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'src/kernel/vfs/procfs.c')

diff --git a/src/kernel/vfs/procfs.c b/src/kernel/vfs/procfs.c
index a417606..be907fd 100644
--- a/src/kernel/vfs/procfs.c
+++ b/src/kernel/vfs/procfs.c
@@ -123,6 +123,10 @@ procfs_accept(struct vfs_request *req)
 		virt_cpy_to(req->caller->pages, req->output.buf, buf, pos);
 		vfsreq_finish_short(req, pos);
 	} else if (req->type == VFSOP_READ && h->type == PhMem) {
+		if (p->pages == NULL || req->caller->pages == NULL) {
+			vfsreq_finish_short(req, 0);
+			return;
+		}
 		size_t res = virt_cpy(
 				req->caller->pages, req->output.buf,
 				p->pages, (__user void*)req->offset,
-- 
cgit v1.2.3