NTFS3 file system kernel mode driver
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From: Zeng Heng <zengheng4@huawei.com>
To: <almaz.alexandrovich@paragon-software.com>
Cc: <weiyongjun1@huawei.com>, <xiexiuqi@huawei.com>,
	<ntfs3@lists.linux.dev>, <liwei391@huawei.com>,
	<linux-kernel@vger.kernel.org>
Subject: [PATCH] fs/ntfs3: fix panic about slab-out-of-bounds caused by ntfs_list_ea()
Date: Thu, 20 Apr 2023 15:46:22 +0800	[thread overview]
Message-ID: <20230420074622.210011-1-zengheng4@huawei.com> (raw)

Here is a BUG report about linux-6.1 from syzbot, but it still remains
within upstream:

BUG: KASAN: slab-out-of-bounds in ntfs_list_ea fs/ntfs3/xattr.c:191 [inline]
BUG: KASAN: slab-out-of-bounds in ntfs_listxattr+0x401/0x570 fs/ntfs3/xattr.c:710
Read of size 1 at addr ffff888021acaf3d by task syz-executor128/3632

Call Trace:
 kasan_report+0x139/0x170 mm/kasan/report.c:495
 ntfs_list_ea fs/ntfs3/xattr.c:191 [inline]
 ntfs_listxattr+0x401/0x570 fs/ntfs3/xattr.c:710
 vfs_listxattr fs/xattr.c:457 [inline]
 listxattr+0x293/0x2d0 fs/xattr.c:804
 path_listxattr fs/xattr.c:828 [inline]
 __do_sys_llistxattr fs/xattr.c:846 [inline]

Before derefering field members of `ea` in unpacked_ea_size(), we need to
check whether the EA_FULL struct is located in access validate range.

Similarly, when derefering `ea->name` field member, we need to check
whethe the ea->name is located in access validate range, too.

Fixes: be71b5cba2e6 ("fs/ntfs3: Add attrib operations")
Reported-by: syzbot+9fcea5ef6dc4dc72d334@syzkaller.appspotmail.com
Signed-off-by: Zeng Heng <zengheng4@huawei.com>
---
 fs/ntfs3/xattr.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/fs/ntfs3/xattr.c b/fs/ntfs3/xattr.c
index ff64302e87e5..27eb30453b9f 100644
--- a/fs/ntfs3/xattr.c
+++ b/fs/ntfs3/xattr.c
@@ -210,11 +210,15 @@ static ssize_t ntfs_list_ea(struct ntfs_inode *ni, char *buffer,
 	size = le32_to_cpu(info->size);
 
 	/* Enumerate all xattrs. */
-	for (ret = 0, off = 0; off < size; off += ea_size) {
+	for (ret = 0, off = 0; off + sizeof(struct EA_FULL) < size; off += ea_size) {
 		ea = Add2Ptr(ea_all, off);
 		ea_size = unpacked_ea_size(ea);
 
 		if (buffer) {
+			/* Check if we can use field ea->name */
+			if (off + ea_size > size)
+				break;
+
 			if (ret + ea->name_len + 1 > bytes_per_buffer) {
 				err = -ERANGE;
 				goto out;
-- 
2.25.1


             reply	other threads:[~2023-04-20  7:15 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-04-20  7:46 Zeng Heng [this message]
2023-07-03  7:36 ` [PATCH] fs/ntfs3: fix panic about slab-out-of-bounds caused by ntfs_list_ea() Konstantin Komarov

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