mountall does not preserve all attributes from /lib/udev/devices when populating /dev
Bug #507162 reported by
Mat Martineau
This bug affects 1 person
| Affects | Status | Importance | Assigned to | Milestone | |
|---|---|---|---|---|---|
| mountall (Ubuntu) |
Fix Released
|
Undecided
|
Unassigned | ||
Bug Description
Binary package hint: mountall
Population of the /dev directory from /lib/udev/devices has changed with karmic.
In previous releases, "cp -a" was used to copy the device nodes in the udev init script. This preserved mode and ownership information on each device node.
mountall uses mknod() to populate /dev using the files in /lib/udev/devices as templates, but mknod() creates file system nodes owned by effective user ID of the process and the 'mode' parameter to mknod() is subject to the process' umask. All nodes are owned by root:root and are never writeable by non-root users, no matter what the user, group, or permissions are in /lib/udev/devices.
Related branches
| summary: |
- mountall does not preserve file attributes when populating /dev + mountall does not preserve all attributes from /lib/udev/devices when + populating /dev |
Revision history for this message
| Mat Martineau (mat-martineau) wrote | #1 |
Revision history for this message
| Launchpad Janitor (janitor) wrote | #2 |
| Changed in mountall (Ubuntu): | |
| status: | New → Fix Released |
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Looks like this changes in mountall 2.x, which instead uses upstart (configured with mounted-dev.conf) to do the initial population of /dev.
However, the current version of mounted-dev.conf ignores /lib/udev/devices and uses MAKEDEV instead (minor quibble: comments and commands in mounted-dev.conf are inconsistent).
The current udev README says:
- The content of /lib/udev/devices directory which contains the nodes,
symlinks and directories, which are always expected to be in /dev, should
be copied over to the tmpfs mounted /dev, to provide the required nodes
to initialize udev and continue booting.
While I hope the solution for this bug is to restore the 'cp -a' method of populating /dev (maybe in addition to using MAKEDEV in mounted-dev.conf), if the /lib/udev/devices directory is going to be ignored then it should probably not be created to begin with.