linux-kernel - [PATCH 3/4] mm/mempolicy: return EINVAL for illegal user memory range for mbind

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Message-ID: <20221205034108.3365182-4-mawupeng1@huawei.com>
Date:   Mon, 5 Dec 2022 11:41:07 +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 3/4] mm/mempolicy: return EINVAL for illegal user memory range for mbind

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

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

Signed-off-by: Ma Wupeng <mawupeng1@...wei.com>
---
 mm/mempolicy.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index e3a2c465fe8a..a6bddf454953 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1272,6 +1272,9 @@ static long do_mbind(unsigned long start, unsigned long len,
 	if (start & ~PAGE_MASK)
 		return -EINVAL;
 
+	if (unlikely(!access_ok((void __user *)start, len)))
+		return -EINVAL;
+
 	if (mode == MPOL_DEFAULT)
 		flags &= ~MPOL_MF_STRICT;
 
-- 
2.25.1