linux-kernel - [PATCH v3 2/4] mm/mempolicy: return EINVAL for if len overflows for set_mempolicy_home

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20230128063229.989058-3-mawupeng1@huawei.com>
Date:   Sat, 28 Jan 2023 14:32:27 +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>
Subject: [PATCH v3 2/4] mm/mempolicy: return EINVAL for if len overflows for set_mempolicy_home_node

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

Check and return 0 if len == 0 at the beginning of the function.
Return -EINVAL if len overflows for set_mempolicy_home_node.

Signed-off-by: Ma Wupeng <mawupeng1@...wei.com>
---
 mm/mempolicy.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 02c8a712282f..85c5d3c2503b 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1512,13 +1512,16 @@ SYSCALL_DEFINE4(set_mempolicy_home_node, unsigned long, start, unsigned long, le
 	if (home_node >= MAX_NUMNODES || !node_online(home_node))
 		return -EINVAL;
 
+	if (!len)
+		return 0;
+
 	len = PAGE_ALIGN(len);
-	end = start + len;
+	if (!len)
+		return -EINVAL;
 
+	end = start + len;
 	if (end < start)
 		return -EINVAL;
-	if (end == start)
-		return 0;
 	mmap_write_lock(mm);
 	for_each_vma_range(vmi, vma, end) {
 		vmstart = max(start, vma->vm_start);
-- 
2.25.1