From: Lino Sanfilippo <LinoSanfilippo@gmx.de>
To: Eric Paris <eparis@redhat.com>
Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: Re: Ensure FMODE_NONOTIFY is not set by userspace
Date: Fri, 29 Oct 2010 16:27:52 +0200 [thread overview]
Message-ID: <20101029142752.GF26242@lsanfilippo.unix.rd.tt.avira.com> (raw)
In-Reply-To: <1288360370.3017.15.camel@localhost.localdomain>
On Fri, Oct 29, 2010 at 09:52:50AM -0400, Eric Paris wrote:
>
> Did you find a place where the user was able to set FMODE_NONOTIFY?
> That would be a problem. But that's not what is happening here and
> that's not what you are fixing.
I know its not happening here, but doing something like
#define MY_FLAG 0x1000000
open("file/within/fanotify_protection", O_RDONLY | MY_FLAG);
from userspace is all that is needed to be ignored by fanotify :)
There is nothing that checks if this flag has been set by userspace (or
did I miss something?)
Beside this since the flag should only be set within create_fd() or
fanotify_init() there should never be a situation where
fsnotify_open() is called with a FMODE_NONOTIFY set (by the kernel).
Regards,
Lino
next prev parent reply other threads:[~2010-10-29 14:29 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-29 10:02 Ensure FMODE_NONOTIFY is not set by userspace Lino Sanfilippo
2010-10-29 13:52 ` Eric Paris
2010-10-29 14:27 ` Lino Sanfilippo [this message]
2010-10-29 16:10 ` Eric Paris
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