Bug 245717 – problem in udev regarding LUKS identification

Bug 245717 - problem in udev regarding LUKS identification

Summary:	problem in udev regarding LUKS identification

Status:	CLOSED NOTABUG

Aliases:	None

Product:	Fedora
Classification:	Fedora
Component:	udev (Show other bugs)
Sub Component:
Version:	rawhide
Hardware:	All Linux

Priority	medium Severity high
Target Milestone:	---
Target Release:	---
Assigned To:	Harald Hoyer
QA Contact:	Fedora Extras Quality Assurance
Docs Contact:

URL:	http://article.gmane.org/gmane.comp.f...
Whiteboard:
Keywords:

Depends On:
Blocks:
	Show dependency tree / graph

Reported:	2007-06-26 05:49 EDT by Karsten Hopp
Modified:	2007-11-30 17:12 EST (History)
CC List:	1 user (show)

See Also:
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2007-08-07 09:15:12 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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Description Karsten Hopp 2007-06-26 05:49:04 EDT

Description of problem:
udev sets its magic string in the first 512 bytes
of the partition.  This is dangerous and error-prone, because other
things like boot sectors and BSD disk labels tend to live in the first
512 byte sector.

Additional info:
Please report to upstream, full text available at
http://article.gmane.org/gmane.comp.file-systems.ext4/2316/

Comment 1 Harald Hoyer 2007-06-26 09:53:38 EDT

"udev sets its magic string in the first 512 bytes"

s/sets/gets/

Comment 2 Kay Sievers 2007-06-27 12:58:43 EDT

That's nothing new. Guessing filesystems by magic bytes on the disk is by
definition unsafe.

_All_ filesystem formatters are required to wipe out _all_ existing signatures
before applying a new signature. Even then, it's not entirely safe to probe, but
we obviously have no alternatives.

Shuffling the probing order around will only switch the systems where such
problems occur. From my standpoint, you can close this "bug". Thanks!

Comment 3 Karsten Hopp 2007-08-07 09:15:12 EDT

Closing based on comment #2. All formatters need to wipe out all signatures

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