From a39aa73e21bbc93ff025b78fc2b48f589f759d76 Mon Sep 17 00:00:00 2001
From: Bananymous <oskari.alaranta@bananymous.com>
Date: Mon, 10 Nov 2025 03:53:34 +0200
Subject: [PATCH] Kernel: Allow munmap on non-page aligned address

---
 kernel/kernel/Process.cpp | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/kernel/kernel/Process.cpp b/kernel/kernel/Process.cpp
index 19c762b1..940eb221 100644
--- a/kernel/kernel/Process.cpp
+++ b/kernel/kernel/Process.cpp
@@ -2326,9 +2326,12 @@ namespace Kernel
 		if (len == 0)
 			return BAN::Error::from_errno(EINVAL);
 
-		const vaddr_t vaddr = reinterpret_cast<vaddr_t>(addr);
-		if (vaddr % PAGE_SIZE != 0)
-			return BAN::Error::from_errno(EINVAL);
+		vaddr_t vaddr = reinterpret_cast<vaddr_t>(addr);
+		if (auto rem = vaddr % PAGE_SIZE)
+		{
+			vaddr -= rem;
+			len += PAGE_SIZE - rem;
+		}
 
 		if (auto rem = len % PAGE_SIZE)
 			len += PAGE_SIZE - rem;