From e0101ecf0d2f29d8860e865e3f333803af918f2e Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Sat, 21 May 2022 18:30:52 +0200
Subject: syscall/memflag: zero out allocated pages to prevent leaks

---
 src/kernel/syscalls.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

(limited to 'src')

diff --git a/src/kernel/syscalls.c b/src/kernel/syscalls.c
index 560cd37..af70e4e 100644
--- a/src/kernel/syscalls.c
+++ b/src/kernel/syscalls.c
@@ -266,8 +266,11 @@ int _syscall_memflag(void __user *addr, size_t len, int flags) {
 			continue;
 		}
 
-		if (!pagedir_virt2phys(pages, addr, false, false))
-			pagedir_map(pages, addr, page_alloc(1), true, true);
+		if (!pagedir_virt2phys(pages, addr, false, false)) {
+			void *phys = page_alloc(1);
+			memset(phys, 0, PAGE_SIZE); // TODO somehow test this
+			pagedir_map(pages, addr, phys, true, true);
+		}
 	}
 
 	SYSCALL_RETURN(-1);
-- 
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