Fwd: [Bug 201869] New: CIFS: block on llistxattr for SMB1

[冯小丽]

Re-send the smb log again because send it to samba-technical@ failed.

冯小丽 <fengxiaoli0714 at gmail.com> 于2018年12月8日周六 下午6:42写道：

> The debug level 10 log for smbd is attached.
>
> Jeremy Allison <jra at samba.org> 于2018年12月5日周三 上午6:48写道：
>
>> On Tue, Dec 04, 2018 at 04:42:20PM -0600, Steve French wrote:
>> > On Tue, Dec 4, 2018 at 2:41 PM Jeremy Allison <jra at samba.org> wrote:
>> > >
>> > > On Tue, Dec 04, 2018 at 02:23:16PM -0600, Steve French wrote:
>> > > > This is a Samba server bug - see frame 17 of the trace I attached.
>> > > > The Samba server hung on the level 512 query info (and then hangs
>> > > > again after the client gives up and reconnects etc.).
>> > >
>> > > Yes, smbd doesn't support EA's on symlinks. That's probably not
>> > > going to change in the short term.
>> >
>> > I am not worried about supporting EAs on symlinks here, I am worried
>> > about the fact
>> > that the Samba server was hanging (even on reboot Samba wouldn't
>> stop).  I doubt
>> > that setfattr was relevant, but the fact that a getfattr hangs is a bad
>> thing.
>> >
>> > Basically not supporting EAs on symlinks is not the problem - hanging
>> > on querying symlinks is.
>> >
>> > Repro is easy:
>> >
>> > Just do "getfattr --absolute-names -dh -m user /mnt2/cifs/src-dir" on a
>> symlink.
>> >
>> > I tried it with Ubuntu 4.15 kernel and it hung Samba (server) the same
>> way.
>> > The exact repro steps (in my example /test was exported as
>> > //localhost/test by Samba) were. The only non-default thing needed in
>> > mount is "vers=1.0"
>> >
>> > root at smf-Thinkpad-P51:~# mount -t cifs //localhost/test /mnt2
>> > -ousername=testuser,vers=1.0
>> > root at smf-Thinkpad-P51:~# mkdir -m 0777 /test/cifs
>> > root at smf-Thinkpad-P51:~# mkdir /mnt2/cifs/target-dir
>> > root at smf-Thinkpad-P51:~# ln -s /mnt2/cifs/target-dir /mnt2/cifs/src-dir
>> > root at smf-Thinkpad-P51:~# setfattr -h -n user.name /mnt2/cifs/src-dir
>> > setfattr: /mnt2/cifs/src-dir: Operation not permitted
>> > root at smf-Thinkpad-P51:~# getfattr --absolute-names -dh -m user
>> > /mnt2/cifs/src-dir
>> > <hangs on server in smb1 querypathinfo processing>
>>
>> Oh, I missed that. Can you get a debug level 10 log from the smbd ?
>>
>
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