From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/lib/usercopy.c | 7 +++++++
1 files changed, 7 insertions(+), 0 deletions(-)
diff --git a/kernel/lib/usercopy.c b/kernel/lib/usercopy.c
index 7413dd3..7ee63df 100644
--- a/kernel/lib/usercopy.c
+++ b/kernel/lib/usercopy.c
@@ -3,6 +3,7 @@
#include <linux/fault-inject-usercopy.h>
#include <linux/instrumented.h>
#include <linux/uaccess.h>
+#include <linux/nospec.h>
/* out-of-line parts */
@@ -12,6 +13,12 @@
unsigned long res = n;
might_fault();
if (!should_fail_usercopy() && likely(access_ok(from, n))) {
+ /*
+ * Ensure that bad access_ok() speculation will not
+ * lead to nasty side effects *after* the copy is
+ * finished:
+ */
+ barrier_nospec();
instrument_copy_from_user(to, from, n);
res = raw_copy_from_user(to, from, n);
}
--
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