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Re: [Qemu-devel] 9pfs-local: open2() deletes existing data?

From: Aneesh Kumar K.V
Subject: Re: [Qemu-devel] 9pfs-local: open2() deletes existing data?
Date: Thu, 05 Mar 2015 23:32:30 +0530
User-agent: Notmuch/0.19+30~gd241a48 (http://notmuchmail.org) Emacs/24.3.1 (x86_64-pc-linux-gnu)

Michael Tokarev <address@hidden> writes:

> I was looking at various interesting functions in hw/9pfs/virtio-9p-local.c
> and noticed local_open2() which basically tries to open a file in a
> filesystem, and if that is successful, it tries to set file credentials
> using a configured mechanism, and if that fails, it deletes the file.
> Now I wonder what happens if we tried to open an existing file but was
> not able to set credentials for whatever reason -- eg, because the
> underlying filesystem does not support xattrs, or whatever.  It looks
> to me that we will remove the user file!
> If that's the case, it looks like it is a very serious bug...

That callback is used for create. What is used for open is local_open()


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