linux-kernel - Re: i386-show-unhandled-signals-v3

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Date:	Thu, 26 Jul 2007 11:13:48 +0200
From:	Rene Herman <rene.herman@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Masoud Sharbiani <masouds@...gle.com>, Andi Kleen <ak@...e.de>,
	Kirill Korotaev <dev@...nvz.org>, linux-kernel@...r.kernel.org
Subject: Re: i386-show-unhandled-signals-v3

On 07/26/2007 01:25 AM, Andrew Morton wrote:

> On Wed, 25 Jul 2007 14:07:56 -0700
> "Masoud Sharbiani" <masouds@...gle.com> wrote:

>> This is rate limited; Do you need me to rewrite it with it being
>> disabled by default?
> 
> Yes please.
> 
> Look: if there's a way in which an unprivileged user can trigger a printk
> we fix it, end of story. I don't know why this even slightly controversial.

rene@...e4:/tmp$ su -c "dmesg -c >/dev/null"
rene@...e4:/tmp$ cdparanoia -B

[ ... ]

rene@...e4:/tmp$ dmesg | wc -l
158
rene@...e4:/tmp$ dmesg | tail -20
sg_write: data in/out 30576/30576 bytes for SCSI command 0xbe--guessing data in;
    program cdparanoia not setting count and/or reply_len properly
printk: 252 messages suppressed.
sg_write: data in/out 16464/16464 bytes for SCSI command 0xbe--guessing data in;
    program cdparanoia not setting count and/or reply_len properly
printk: 245 messages suppressed.
sg_write: data in/out 30576/30576 bytes for SCSI command 0xbe--guessing data in;
    program cdparanoia not setting count and/or reply_len properly
printk: 243 messages suppressed.
sg_write: data in/out 30576/30576 bytes for SCSI command 0xbe--guessing data in;
    program cdparanoia not setting count and/or reply_len properly
printk: 242 messages suppressed.
sg_write: data in/out 30576/30576 bytes for SCSI command 0xbe--guessing data in;
    program cdparanoia not setting count and/or reply_len properly
printk: 255 messages suppressed.
sg_write: data in/out 30576/30576 bytes for SCSI command 0xbe--guessing data in;
    program cdparanoia not setting count and/or reply_len properly
printk: 242 messages suppressed.
sg_write: data in/out 30576/30576 bytes for SCSI command 0xbe--guessing data in;
    program cdparanoia not setting count and/or reply_len properly

cdparanoia does require access to the /dev/sg? that corresponds to /dev/cdrom 
but at least udev (here) makes that node be a (root,cdrom) b-rw-rw--- device 
(and requiring root privileges to rip CDs would certainly not be nice).

Rene.
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