From: Richard Weinberger <richard@nod.at>
To: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>,
Al Viro <viro@ZenIV.linux.org.uk>
Cc: Sami Liedes <sami.liedes@iki.fi>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>
Subject: Re: Intentionally corrupted vfat fs causing BUG
Date: Thu, 23 Oct 2014 18:55:46 +0200 [thread overview]
Message-ID: <54493312.7070606@nod.at> (raw)
In-Reply-To: <8738ae91cw.fsf@devron.myhome.or.jp>
Am 23.10.2014 um 18:50 schrieb OGAWA Hirofumi:
> OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> writes:
>
>> Al Viro <viro@ZenIV.linux.org.uk> writes:
>>
>>> On Thu, Oct 23, 2014 at 05:01:06PM +0100, Al Viro wrote:
>>>
>>>> Hmm... Why hadn't d_splice_alias() caught that, though?
>>>
>>> Aha. It's not namei_msdos.c part, it's namei_vfat.c one. And there
>>> we don't call d_splice_alias() on the affected path...
>>>
>>> OK, so your check isn't enough. What we need there is this:
>>> if (alias && alias->d_parent == dentry->d_parent && ...)
>>> Otherwise that d_move() isn't safe at all.
>>
>> Hm, sounds like I'm missing something. what case has different
>> ->d_parent on alias if prevented by my check?
>
> You meant the case of more complex double linked loop?
Yes. This is why I came up with the alias->d_parent == dentry->d_parent check.
Thanks,
//richard
next prev parent reply other threads:[~2014-10-23 16:55 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-10 20:57 Intentionally corrupted vfat fs causing BUG Sami Liedes
2014-10-11 10:20 ` Richard Weinberger
2014-10-12 12:08 ` OGAWA Hirofumi
2014-10-12 19:04 ` Richard Weinberger
2014-10-12 20:40 ` Sami Liedes
2014-10-13 7:57 ` OGAWA Hirofumi
2014-10-13 8:22 ` Richard Weinberger
2014-10-13 8:35 ` OGAWA Hirofumi
2014-10-13 8:39 ` Richard Weinberger
2014-10-13 8:59 ` OGAWA Hirofumi
2014-10-13 14:36 ` Richard Weinberger
2014-10-19 16:36 ` Richard Weinberger
2014-10-23 15:28 ` OGAWA Hirofumi
2014-10-23 16:01 ` Al Viro
2014-10-23 16:16 ` Al Viro
2014-10-23 16:45 ` OGAWA Hirofumi
2014-10-23 16:50 ` OGAWA Hirofumi
2014-10-23 16:55 ` Richard Weinberger [this message]
2014-10-23 16:55 ` Al Viro
2014-10-23 17:21 ` Al Viro
2014-10-23 17:58 ` OGAWA Hirofumi
2014-10-23 20:46 ` Sami Liedes
2014-10-23 17:35 ` OGAWA Hirofumi
2014-10-23 17:54 ` J. Bruce Fields
2014-10-23 18:05 ` Al Viro
2014-10-23 18:16 ` J. Bruce Fields
2014-10-23 16:56 ` Al Viro
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