linux-kernel - [PATCH 2/4] mm/mempolicy: return EINVAL for illegal user memory range for set_mempolicy_home

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Date:   Mon, 5 Dec 2022 11:41:06 +0800
From:   Wupeng Ma <mawupeng1@...wei.com>
To:     <akpm@...ux-foundation.org>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <mawupeng1@...wei.com>, <kuleshovmail@...il.com>,
        <aneesh.kumar@...ux.ibm.com>, <clameter@....com>
Subject: [PATCH 2/4] mm/mempolicy: return EINVAL for illegal user memory range for set_mempolicy_home_node

From: Ma Wupeng <mawupeng1@...wei.com>

Add access_ok to check user memory range and return EINVAL if overflows.

Signed-off-by: Ma Wupeng <mawupeng1@...wei.com>
---
 mm/mempolicy.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 61aa9aedb728..e3a2c465fe8a 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1499,6 +1499,10 @@ SYSCALL_DEFINE4(set_mempolicy_home_node, unsigned long, start, unsigned long, le
 	start = untagged_addr(start);
 	if (start & ~PAGE_MASK)
 		return -EINVAL;
+
+	if (unlikely(!access_ok((void __user *)start, len)))
+		return -EINVAL;
+
 	/*
 	 * flags is used for future extension if any.
 	 */
-- 
2.25.1