From: Wupeng Ma <mawupeng1@huawei.com>
To: <akpm@linux-foundation.org>
Cc: <linux-mm@kvack.org>, <linux-kernel@vger.kernel.org>,
<mawupeng1@huawei.com>, <kuleshovmail@gmail.com>,
<aneesh.kumar@linux.ibm.com>, <clameter@sgi.com>
Subject: [PATCH 4/4] mm/msync: return EINVAL for illegal user memory range for msync
Date: Mon, 5 Dec 2022 11:41:08 +0800 [thread overview]
Message-ID: <20221205034108.3365182-5-mawupeng1@huawei.com> (raw)
In-Reply-To: <20221205034108.3365182-1-mawupeng1@huawei.com>
From: Ma Wupeng <mawupeng1@huawei.com>
Add access_ok to check user memory range and return EINVAL if overflows for
msync.
Signed-off-by: Ma Wupeng <mawupeng1@huawei.com>
---
mm/msync.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/mm/msync.c b/mm/msync.c
index ac4c9bfea2e7..a87c3dca473a 100644
--- a/mm/msync.c
+++ b/mm/msync.c
@@ -43,6 +43,8 @@ SYSCALL_DEFINE3(msync, unsigned long, start, size_t, len, int, flags)
goto out;
if (offset_in_page(start))
goto out;
+ if (unlikely(!access_ok((void __user *)start, len)))
+ goto out;
if ((flags & MS_ASYNC) && (flags & MS_SYNC))
goto out;
error = -ENOMEM;
--
2.25.1
next prev parent reply other threads:[~2022-12-05 3:41 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-05 3:41 [PATCH 0/4] return EINVAL for illegal user memory range Wupeng Ma
2022-12-05 3:41 ` [PATCH 1/4] mm/mlock: return EINVAL for illegal user memory range in mlock Wupeng Ma
2022-12-10 3:09 ` mawupeng
2022-12-28 22:17 ` Andrew Morton
2022-12-29 7:48 ` mawupeng
2022-12-05 3:41 ` [PATCH 2/4] mm/mempolicy: return EINVAL for illegal user memory range for set_mempolicy_home_node Wupeng Ma
2022-12-05 3:41 ` [PATCH 3/4] mm/mempolicy: return EINVAL for illegal user memory range for mbind Wupeng Ma
2022-12-05 3:41 ` Wupeng Ma [this message]
2022-12-27 7:18 ` [PATCH 0/4] return EINVAL for illegal user memory range mawupeng
2023-01-02 13:22 ` David Hildenbrand
2023-01-04 9:32 ` mawupeng
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