From 14cf1efc9dfa388c3dfec3815abd114f2a36bd38 Mon Sep 17 00:00:00 2001
From: Luca Dariz <luca@orpolo.org>
Date: Tue, 28 Jun 2022 12:10:44 +0200
Subject: sign-extend mask in vm_map() with 32-bit userspace

* vm/vm_user.c: sign-extend mask with USER32

Signed-off-by: Luca Dariz <luca@orpolo.org>
Message-Id: <20220628101054.446126-6-luca@orpolo.org>
---
 vm/vm_user.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'vm')

diff --git a/vm/vm_user.c b/vm/vm_user.c
index 3ef64dfc..9e789eba 100644
--- a/vm/vm_user.c
+++ b/vm/vm_user.c
@@ -338,6 +338,11 @@ kern_return_t vm_map(
 	if (size == 0)
 		return KERN_INVALID_ARGUMENT;
 
+#ifdef USER32
+        if (mask & 0x80000000)
+            mask |= 0xffffffff00000000;
+#endif
+
 	*address = trunc_page(*address);
 	size = round_page(size);
 
-- 
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