From: Pete Zaitcev <zaitcev@redhat.com>
To: Greg KH <greg@kroah.com>
Cc: linux-kernel@vger.kernel.org, zaitcev@redhat.com
Subject: Re: Binary sysfs blobs
Date: Wed, 12 Apr 2006 03:34:13 -0700 [thread overview]
Message-ID: <20060412033413.6fa5dd54.zaitcev@redhat.com> (raw)
In-Reply-To: <20060411204203.GA6177@kroah.com>
On Tue, 11 Apr 2006 13:42:03 -0700, Greg KH <greg@kroah.com> wrote:
> No. Binary sysfs files are for "pass-through" mode only. You are ONLY
> allowed to use them if you want to read from, or write to, some bit of
> hardware and not manipulate the data at all. Examples of this is the
> raw PCI config space, firmware binary blobs and BIOS upgrades.
I see. Kind of the opposite of what I thought they were, but it
makes sense. Thanks.
> You should NEVER pass a raw structure through sysfs by using a binary
> file. If anyone sees anywhere in the current kernel that does this,
> please let me know and I'll go hit them with a big stick...
I dunno how raw this is, but chp_measurement_copy_block and
chp_measurement_read (in drivers/s390/cio/chsc.c) sure look like
passing structures, in 2.6.17-rc1. However, the code does not interpret
the structures, so maybe it's raw enough.
-- Pete
prev parent reply other threads:[~2006-04-12 10:34 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-04-11 18:08 Binary sysfs blobs Pete Zaitcev
2006-04-11 18:57 ` Jesse Barnes
2006-04-11 20:42 ` Greg KH
2006-04-12 10:34 ` Pete Zaitcev [this message]
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