From: Al Viro <viro@zeniv.linux.org.uk>
To: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Cc: "Pali Rohár" <pali.rohar@gmail.com>,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
"Theodore Y. Ts'o" <tytso@mit.edu>,
"Namjae Jeon" <linkinjeon@gmail.com>,
"Gabriel Krisman Bertazi" <krisman@collabora.com>,
"Linus Torvalds" <torvalds@linux-foundation.org>
Subject: Re: oopsably broken case-insensitive support in ext4 and f2fs (Re: vfat: Broken case-insensitive support for UTF-8)
Date: Mon, 20 Jan 2020 19:35:58 +0000 [thread overview]
Message-ID: <20200120193558.GD8904@ZenIV.linux.org.uk> (raw)
In-Reply-To: <20200120080721.GB8904@ZenIV.linux.org.uk>
On Mon, Jan 20, 2020 at 08:07:21AM +0000, Al Viro wrote:
> > > I hadn't checked ->d_compare() instances for a while; somebody needs to
> > > do that again, by the look of it. The above definitely is broken;
> > > no idea how many other instaces had grown such bugs...
> >
> > f2fs one also has the same bug. Anyway, I'm going down right now, will
> > check the rest tomorrow morning...
>
> We _probably_ can get away with just checking that inode for NULL and
> buggering off if it is (->d_seq mismatch is guaranteed in that case),
> but I suspect that we might need READ_ONCE() on both dereferences.
> I hate memory barriers...
FWIW, other instances seem to be OK; HFS+ one might or might not be
OK in the face of concurrent rename (wrong result in that case is
no problem; oops would be), but it doesn't play silly buggers with
pointer-chasing.
ext4 and f2fs do, and ->d_compare() is broken in both of them.
next prev parent reply other threads:[~2020-01-20 19:36 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-19 22:14 vfat: Broken case-insensitive support for UTF-8 Pali Rohár
2020-01-19 23:08 ` Al Viro
2020-01-19 23:33 ` Pali Rohár
2020-01-20 0:09 ` Al Viro
2020-01-20 11:19 ` Pali Rohár
2020-01-20 4:04 ` OGAWA Hirofumi
2020-01-20 7:30 ` Al Viro
2020-01-20 7:45 ` Al Viro
2020-01-20 8:07 ` oopsably broken case-insensitive support in ext4 and f2fs (Re: vfat: Broken case-insensitive support for UTF-8) Al Viro
2020-01-20 19:35 ` Al Viro [this message]
2020-01-24 4:29 ` Eric Biggers
2020-01-24 17:47 ` Linus Torvalds
2020-01-24 18:03 ` Jaegeuk Kim
2020-01-24 18:45 ` Eric Biggers
2020-01-20 11:04 ` vfat: Broken case-insensitive support for UTF-8 Pali Rohár
2020-01-20 12:07 ` OGAWA Hirofumi
2020-01-20 21:40 ` Pali Rohár
2020-01-20 22:46 ` Al Viro
2020-01-20 23:57 ` Pali Rohár
2020-01-21 0:07 ` Al Viro
2020-01-21 20:34 ` Pali Rohár
2020-01-21 21:36 ` Al Viro
2020-01-21 22:14 ` Al Viro
2020-01-21 22:46 ` Pali Rohár
2020-01-26 23:08 ` Pali Rohár
2020-01-21 12:43 ` David Laight
2020-01-22 0:25 ` Gabriel Krisman Bertazi
2020-01-20 15:07 ` David Laight
2020-01-20 15:20 ` Pali Rohár
2020-01-20 15:47 ` David Laight
2020-01-20 16:12 ` Al Viro
2020-01-20 16:51 ` David Laight
2020-01-20 16:27 ` Pali Rohár
2020-01-20 16:43 ` David Laight
2020-01-20 16:56 ` Pali Rohár
2020-01-20 17:37 ` Theodore Y. Ts'o
2020-01-20 17:32 ` Theodore Y. Ts'o
2020-01-20 17:56 ` Pali Rohár
2020-01-21 3:52 ` OGAWA Hirofumi
2020-01-21 11:00 ` Pali Rohár
2020-01-21 12:26 ` OGAWA Hirofumi
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