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>, <david@redhat.com>
Subject: [PATCH v4 4/4] mm/msync: return ENOMEM if len overflows for msync
Date: Mon, 20 Mar 2023 10:47:39 +0800 [thread overview]
Message-ID: <20230320024739.224850-5-mawupeng1@huawei.com> (raw)
In-Reply-To: <20230320024739.224850-1-mawupeng1@huawei.com>
From: Ma Wupeng <mawupeng1@huawei.com>
Return -ENOMEM if len overflows for msync.
Signed-off-by: Ma Wupeng <mawupeng1@huawei.com>
---
mm/msync.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/mm/msync.c b/mm/msync.c
index ac4c9bfea2e7..8ac227ec38af 100644
--- a/mm/msync.c
+++ b/mm/msync.c
@@ -36,6 +36,7 @@ SYSCALL_DEFINE3(msync, unsigned long, start, size_t, len, int, flags)
struct vm_area_struct *vma;
int unmapped_error = 0;
int error = -EINVAL;
+ size_t old_len = len;
start = untagged_addr(start);
@@ -48,7 +49,7 @@ SYSCALL_DEFINE3(msync, unsigned long, start, size_t, len, int, flags)
error = -ENOMEM;
len = (len + ~PAGE_MASK) & PAGE_MASK;
end = start + len;
- if (end < start)
+ if (end < start || (old_len != 0 && len == 0))
goto out;
error = 0;
if (end == start)
--
2.25.1
next prev parent reply other threads:[~2023-03-20 2:48 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-20 2:47 [PATCH v4 0/4] Add overflow checks for several syscalls Wupeng Ma
2023-03-20 2:47 ` [PATCH v4 1/4] mm/mlock: return EINVAL if len overflows for mlock/munlock Wupeng Ma
2023-03-20 10:54 ` David Hildenbrand
2023-03-20 11:05 ` mawupeng
2023-03-21 7:44 ` mawupeng
2023-03-21 14:19 ` David Hildenbrand
2023-03-22 2:14 ` mawupeng
2023-03-22 8:54 ` David Hildenbrand
2023-03-22 9:01 ` David Hildenbrand
2023-03-22 9:20 ` mawupeng
2023-03-22 11:27 ` David Hildenbrand
2023-03-20 2:47 ` [PATCH v4 2/4] mm/mempolicy: return EINVAL for if len overflows for set_mempolicy_home_node Wupeng Ma
2023-03-20 2:47 ` [PATCH v4 3/4] mm/mempolicy: return EINVAL if len overflows for mbind Wupeng Ma
2023-03-20 2:47 ` Wupeng Ma [this message]
2023-03-20 11:06 ` [PATCH v4 0/4] Add overflow checks for several syscalls mawupeng
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