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ntfs: check overflow when iterating ATTR_RECORDs 

Kernel iterates over ATTR_RECORDs in mft record in ntfs_attr_find(). 
Because the ATTR_RECORDs are next to each other, kernel can get the next
ATTR_RECORD from end address of current ATTR_RECORD, through current
ATTR_RECORD length field.

The problem is that during iteration, when kernel calculates the end
address of current ATTR_RECORD, kernel may trigger an integer overflow bug
in executing `a = (ATTR_RECORD*)((u8*)a + le32_to_cpu(a->length))`.  This
may wrap, leading to a forever iteration on 32bit systems.

This patch solves it by adding some checks on calculating end address
of current ATTR_RECORD during iteration.

Link: https://lkml.kernel.org/r/20220831160935.3409-4-yin31149@gmail.com
Link: https://lore.kernel.org/all/20220827105842.GM2030@kadam/
Signed-off-by: Hawkins Jiawei <yin31149@gmail.com>
Suggested-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Anton Altaparmakov <anton@tuxera.com>
Cc: chenxiaosong (A) <chenxiaosong2@huawei.com>
Cc: syzkaller-bugs <syzkaller-bugs@googlegroups.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Hawkins Jiawei 2022-09-01 00:09:38 +08:00 committed by Andrew Morton
parent 36a4d82ddd
commit 63095f4f3a
1 changed files with 8 additions and 0 deletions
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8
fs/ntfs/attrib.c
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@ -617,6 +617,14 @@ static int ntfs_attr_find(const ATTR_TYPE type, const ntfschar *name,
return -ENOENT;
if (unlikely(!a->length))
break;
/* check whether ATTR_RECORD's length wrap */
if ((u8 *)a + le32_to_cpu(a->length) < (u8 *)a)
break;
/* check whether ATTR_RECORD's length is within bounds */
if ((u8 *)a + le32_to_cpu(a->length) > mrec_end)
break;
if (a->type != type)
continue;
/*