linux-kernel - Re: [2.6.26] kobject_add_internal failed for 2:0 with -EEXIST / unable to handle kernel NULL pointer dereference in sysfs_create

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 3 Nov 2008 12:53:03 +0100
From:	"Kay Sievers" <kay.sievers@...y.org>
To:	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>
Cc:	"Folkert van Heusden" <folkert@...heusden.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [2.6.26] kobject_add_internal failed for 2:0 with -EEXIST / unable to handle kernel NULL pointer dereference in sysfs_create_link

On Fri, Oct 31, 2008 at 10:28, Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
> On Fri, 2008-10-31 at 00:23 +0100, Kay Sievers wrote:
>
>> Peter, it looks like bdi does not work for devices which share a single queue.
>> If I add:
>>   --- a/mm/backing-dev.c
>>  +++ b/mm/backing-dev.c
>>   @@ -184,6 +184,8 @@ int bdi_register(struct backing_dev_info *bdi,
>> struct device *parent,
>>                   goto exit;
>>           }
>>
>>   +       printk("XXXXXXX old bdidev is %p\n", bdi->dev);
>>   +       printk("XXXXXXX new bdidev is %p\n", dev);
>>           bdi->dev = dev;
>>           bdi_debug_register(bdi, dev_name(dev));
>>
>> I get:
>>   $ modprobe floppy
>>   Floppy drive(s): fd0 is 1.44M, fd1 is 1.44M
>>   FDC 0 is a S82078B
>>   XXXXXXX old bdidev is 0000000000000000
>>   XXXXXXX new bdidev is ffff88001f20cd10
>>   XXXXXXX old bdidev is ffff88001f20cd10
>>   XXXXXXX new bdidev is ffff88001f20de30
>>
>> which very much looks like bdi will not remove any earlier registered
>> device, only the last one, right?
>
> Sharing a bdi is odd to begin with, let me poke at this a little.

Yeah, it's odd, but I'm not sure if you want to touch floppy.c. :)
Any objection to this patch, until you possible fix it differently?
  http://marc.info/?l=linux-kernel&m=122541569310798&w=4

Kay
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/