Messages in this thread Patch in this message | | | From | Wupeng Ma <> | Subject | [PATCH 2/4] mm/mempolicy: return EINVAL for illegal user memory range for set_mempolicy_home_node | Date | Mon, 5 Dec 2022 11:41:06 +0800 |
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From: Ma Wupeng <mawupeng1@huawei.com>
Add access_ok to check user memory range and return EINVAL if overflows.
Signed-off-by: Ma Wupeng <mawupeng1@huawei.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
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