Bug 110197

Summary:	Make hard disk devices mode 0640?
Product:	[Fedora] Fedora	Reporter:	Need Real Name <vader>
Component:	udev	Assignee:	Harald Hoyer <harald>
Status:	CLOSED RAWHIDE	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	rawhide	CC:	barryn, mitr, mjc, notting
Target Milestone:	---	Keywords:	FutureFeature
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	3.9.2-1	Doc Type:	Enhancement
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2004-12-21 06:17:48 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	136451

Description Need Real Name 2003-11-16 21:25:08 UTC

Description of problem:
By default, hard disk device special files in /dev/ are created as
root:disk mode 0660 (writable by group "disk").

There doesn't appear to be anything actually using sgid disk AFAICT,
so group write access is not required.  Can we change it to read-only
by group "disk?"

This would be useful for e.g., putting userid "operator" into group
"disk" for performing dumps.  That id could then read from the disks,
but not write to them (providing a greater safety margin).

Note that /etc/dumpdates is already writable by group "disk" so the
operator userid would still be able to modify this file as intended.

Version-Release number of selected component (if applicable):
3.3.8-2

Comment 3 Nalin Dahyabhai 2004-08-31 15:44:57 UTC

Making this change for 3.9.2-1.

Comment 4 Nalin Dahyabhai 2004-09-14 15:28:01 UTC

Reopening.

Comment 5 Féliciano Matias 2004-10-03 17:03:39 UTC

This bug is not in FC3Blocker and it should be. It's a security issue
easy to fix :
/etc/udev/permissions.d/50-udev.permissions
- hd*:root:disk:660
+ hd*:root:disk:640

Comment 6 Alan Cox 2004-10-04 11:32:29 UTC

I don't see that its a security issue per se  - we don't ship suid
disk apps. I agree with the change however.

Comment 7 Féliciano Matias 2004-10-04 11:47:54 UTC

> I don't see that its a security issue

Check FC2, and /dev/hd* have rw access to group disk.
In fact, many other files have write access to group disk.
$ find /dev/ -group disk -perm -020 -print | wc
  16256   16256  237802

But MAKEDEV have change between fc2 and fc3 :
diff 00macros.fc2 00macros.fc3
9c9
< =STORAGE  660 root disk
---
> =STORAGE  640 root disk

So, it's a udev or MAKEDEV bug.

Comment 8 Féliciano Matias 2004-10-04 11:57:08 UTC

I am wrong in comment #c5 .
According to MAKEDEV (from fc3) all devices with disk group should
have root:disk 640 permission. Not only /dev/hd*.