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/syscalls.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

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

diff --git a/src/kernel/syscalls.c b/src/kernel/syscalls.c
index 5771b6a..7fcbd2a 100644
--- a/src/kernel/syscalls.c
+++ b/src/kernel/syscalls.c
@@ -62,6 +62,7 @@ hid_t _sys_open(const char __user *path, long len, int flags) {
 
 	if (flags & ~(OPEN_RW | OPEN_CREATE)) SYSCALL_RETURN(-ENOSYS);
 
+	static_assert(PATH_MAX <= KMALLOC_MAX);
 	if (PATH_MAX < len)
 		SYSCALL_RETURN(-ENAMETOOLONG);
 	/* Doesn't check for free handles. Another thread could use up all
@@ -461,7 +462,8 @@ hid_t _sys_getnull(int flags) {
 
 long _sys_execbuf(void __user *ubuf, size_t len) {
 	if (len == 0) SYSCALL_RETURN(0);
-	if (len > EXECBUF_MAX_LEN)
+	static_assert(EXECBUF_MAX_LEN <= KMALLOC_MAX);
+	if (EXECBUF_MAX_LEN < len)
 		SYSCALL_RETURN(-1);
 	if (proc_cur->execbuf.buf)
 		SYSCALL_RETURN(-1);
-- 
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