linux-kernel - [PATCH 2/2] kfence: only handle kernel mode faults

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Message-Id: <20210514092139.3225509-3-svens@linux.ibm.com>
Date:   Fri, 14 May 2021 11:21:39 +0200
From:   Sven Schnelle <svens@...ux.ibm.com>
To:     Marco Elver <elver@...gle.com>
Cc:     linux-kernel@...r.kernel.org, Sven Schnelle <svens@...ux.ibm.com>
Subject: [PATCH 2/2] kfence: only handle kernel mode faults

Signed-off-by: Sven Schnelle <svens@...ux.ibm.com>
---
 mm/kfence/core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/kfence/core.c b/mm/kfence/core.c
index bc15e3cb71d5..161df492750c 100644
--- a/mm/kfence/core.c
+++ b/mm/kfence/core.c
@@ -813,6 +813,9 @@ bool kfence_handle_page_fault(unsigned long addr, bool is_write, struct pt_regs
 	enum kfence_error_type error_type;
 	unsigned long flags;
 
+	if (user_mode(regs))
+		return false;
+
 	if (!is_kfence_address((void *)addr))
 		return false;
 
-- 
2.25.1