linux-kernel - linux-2.6.25: 'mkdir -p' does not work with rootdir as mount point inside a read only filesystem

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-next>] [day] [month] [year] [list]

Date:	Wed, 30 Apr 2008 16:50:20 +0200
From:	Lothar WaÃŸmann <LW@...O-electronics.de>
To:	linux-kernel@...r.kernel.org
Subject: linux-2.6.25: 'mkdir -p' does not work with rootdir as mount point inside a read only filesystem

Hi,

when trying to create a directory path with 'mkdir -p' with the root
being a mount point of a writeable filesystem that exists inside a
read-only file system, mkdir return -EROFS.

This was tested with the latest git-tree from:
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

The last kernel I know of this has been working was 2.6.22.

E.g.:
|root@...ton1:/# mount
|rootfs on / type rootfs (rw)
|/dev/root on / type jffs2 (ro)
|proc on /proc type proc (rw)
|sysfs on /sys type sysfs (rw)
|/dev/root on /dev/.static/dev type jffs2 (ro)
|tmpfs on /dev type tmpfs (rw,size=10240k,mode=755)
|tmpfs on /var type tmpfs (rw)
|tmpfs on /tmp type tmpfs (rw)
|devpts on /dev/pts type devpts (rw,gid=5,mode=620)
|tmpfs on /dev/shm type tmpfs (rw)
|root@...ton1:/# mkdir -p /dev/.udev/db
|mkdir: Cannot create directory `/dev/': Read-only file system

While:
|root@...ton1:/# cd /dev
|root@...ton1:/# mkdir -p .udev/db
works as expected...

Has anyone else encountered this problem already?
I've searched the archives but could not find anything related to this
problem.



Lothar Waßmann
-- 
___________________________________________________________

Ka-Ro electronics GmbH | Pascalstraße 22 | D - 52076 Aachen
Phone: +49 2408 1402-0 | Fax: +49 2408 1402-10
Geschäftsführer: Matthias Kaussen
Handelsregistereintrag: Amtsgericht Aachen, HRB 4996

www.karo-electronics.de | info@...o-electronics.de
___________________________________________________________
--
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/