From c1d3ac750b8483c9a942d2fb5d5b7245d014e905 Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Sat, 13 Jul 2024 23:37:37 +0200
Subject: kernel/malloc: limit the maximum allocation size to under a page

This will likely be changed back, but for the time being it will let me
implement a better allocator without too much effort.
---
 src/kernel/malloc.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'src/kernel/malloc.c')

diff --git a/src/kernel/malloc.c b/src/kernel/malloc.c
index 8ba00dc..ba1ab42 100644
--- a/src/kernel/malloc.c
+++ b/src/kernel/malloc.c
@@ -116,6 +116,7 @@ mem_debugprint(void)
 void
 *page_alloc(size_t pages)
 {
+	assert(pages == 1); /* not using that assertion... yet */
 	/* i do realize how painfully slow this is */
 	size_t streak = 0;
 	for (size_t i = pbitmap_firstfree; i < pbitmap_len * 8; i++) {
@@ -177,7 +178,11 @@ void
 	Allocation *hdr;
 	void *addr;
 
+	if (KMALLOC_MAX < len) {
+		panic_invalid_state();
+	}
 	len += sizeof(Allocation);
+	assert(len <= PAGE_SIZE);
 	hdr = page_alloc(page_amt(len));
 	hdr->magic = MALLOC_MAGIC;
 	hdr->len = len;
-- 
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