From: Greg KH <greg@kroah.com>
To: linux-hotplug@vger.kernel.org
Subject: Re: udev and sysfs permissions
Date: Fri, 20 May 2005 04:33:56 +0000 [thread overview]
Message-ID: <20050520043356.GA9929@kroah.com> (raw)
In-Reply-To: <9e47339105051915025188e535@mail.gmail.com>
On Thu, May 19, 2005 at 06:02:16PM -0400, Jon Smirl wrote:
> I'm manually chmod'ing a sysfs variable with different permissions.
Ouch, don't do that :(
Hm, does the kernel let you do that? It shouldn't.
You are doing this as root, right?
> About half an hour later (no sure of exact time) the variable is reset
> back to the permissions the driver created it with.
Heh, nice, I like it.
> Is udevd doing this?
Nope, the kernel is. You must have provided enough memory pressure to
push the file out of the dcache, and then when you went to look at it
again, it was created on the fly from scratch again, with the proper
permissions (as the kernel thinks the files have.) Nice to see it's all
working properly :)
> Can udev control sysfs permissions (I though it only controlled the
> device permissions).
No, only the kernel can control sysfs permissions.
thanks,
greg k-h
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next prev parent reply other threads:[~2005-05-20 4:33 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-05-19 22:02 udev and sysfs permissions Jon Smirl
2005-05-19 22:10 ` Kay Sievers
2005-05-20 4:33 ` Greg KH [this message]
2005-05-20 14:06 ` Jon Smirl
2005-05-20 18:33 ` Greg KH
2005-05-20 21:11 ` Jon Smirl
2005-05-20 21:26 ` Jon Smirl
2005-05-20 21:27 ` Greg KH
2005-05-20 21:40 ` Jon Smirl
2005-05-20 21:40 ` Greg KH
2005-05-20 21:41 ` Jon Smirl
2005-05-20 21:53 ` Jon Smirl
2005-05-20 21:54 ` Greg KH
2005-05-20 21:56 ` Greg KH
2005-05-20 22:07 ` Kay Sievers
2005-05-20 22:09 ` Greg KH
2005-05-26 23:09 ` Greg KH
2005-05-27 12:44 ` Maneesh Soni
2005-05-27 16:39 ` Jon Smirl
2005-05-27 21:51 ` Greg KH
2005-05-28 5:06 ` maneesh
2005-05-28 5:08 ` maneesh
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