Gentoo Archives: gentoo-user

From: Alan Mackenzie <acm@×××.de>
To: gentoo-user@l.g.o
Subject: Re: [gentoo-user] Kernel 3.7.9: Lots of devices are root root rw-------.
Date: Sun, 24 Feb 2013 11:02:57
Message-Id: 20130224110201.GA2212@acm.acm
In Reply to: Re: [gentoo-user] Kernel 3.7.9: Lots of devices are root root rw-------. by Alan McKinnon
1 On Sun, Feb 24, 2013 at 10:44:19AM +0200, Alan McKinnon wrote:
2 > On 23/02/2013 19:18, Alan Mackenzie wrote:
3 > > Hi, Gentoo!
4
5 > > Just built the new kernel 3.7.9 last night, and it's one of these
6 > > "nothing works" situations.
7
8 Sorry, I was exaggerating here. I can work normally as long as I don't
9 try to use a peripheral, such as printer, audio, or scanner. My network
10 connection is working OK.
11
12 > > It seems the problems are with the device files, whose ownership is set
13 > > to "root root" (rather than, e.g., "root audio") and whose permissions
14 > > are set to crw------- (rather than the expected crw-rw----).
15
16 > > I'm still running udev-171-r10. This might well make a difference.
17
18 > > Needless to say, everything works under kernel 3.6.11. It would be nice
19 > > if there were some mistake in my kernel config.
20
21 > > Could somebody help me get this fixed, please.
22
23
24 > udev sets ownership and permissions on devices nodes, not the kernel.
25
26 > I'd guess your udev setup is incompatible with 3.7.* so let's start with
27 > the usual:
28
29 > What is your kernel config for the various TMPFS settings in the kernel?
30 > (grep TMPFS in .config)
31
32 CONFIG_DEVTMPFS=y
33 CONFIG_DEVTMPFS_MOUNT=y
34 CONFIG_TMPFS=y
35 CONFIG_TMPFS_POSIX_ACL=y
36 CONFIG_TMPFS_XATTR=y
37
38 > What mount options apply to /dev?
39
40 On my (working) 3.6.11:
41 devtmpfs on /dev type devtmpfs (rw,relatime,size=1988792k,nr_inodes=497198,mode=755)
42
43 On my (non-working) 3.7.9:
44 devtmpfs on /dev type devtmpfs (rw,relatime,size=1988680k,nr_inodes=497170,mode=755)
45
46 > Contents of /etc/fstab?
47
48 (Leading comments have been removed.)
49
50 #/dev/BOOT /boot ext2 noauto,noatime 1 2
51 /dev/md6 / ext3 noatime 0 1
52 /dev/sda2 none swap sw 0 0
53 /dev/sdb2 none swap sw 0 0
54
55 #/dev/mapper/vg-usr /usr ext3 noatime 1 2
56 /dev/mapper/vg-usrportage /usr/portage ext2 noatime 1 2
57 /dev/mapper/vg-usrportagedistfiles /usr/portage/distfiles ext2 noatime 1 2
58 /dev/mapper/vg-usrsrc /usr/src ext3 noatime 1 2
59
60 /dev/mapper/vg-home /home ext3 noatime 1 2
61 /dev/mapper/vg-opt /opt ext3 noatime 1 2
62
63 /dev/mapper/vg-var /var ext3 noatime 1 2
64 /dev/mapper/vg-varspoolmail /var/spool/mail ext3 noatime 1 2
65 /dev/mapper/vg-varspoolnews /var/spool/news reiserfs noatime 1 2
66 /dev/mapper/vg-vardbpkg /var/db/pkg ext3 noatime 1 2
67
68 /dev/mapper/vg-iso /iso ext2 noatime 1 2
69 /dev/mapper/vg-old /old ext2 noatime 1 2
70 /dev/mapper/vg-vg--backup /backup ext2 noatime 1 2
71
72 /dev/cdrom /mnt/cdrom auto noauto,ro 0 0
73 /dev/fd0 /mnt/floppy auto noauto 0 0
74
75 # glibc 2.2 and above expects tmpfs to be mounted at /dev/shm for
76 # POSIX shared memory (shm_open, shm_unlink).
77 # (tmpfs is a dynamically expandable/shrinkable ramdisk, and will
78 # use almost no memory if not populated with files)
79 shm /dev/shm tmpfs nodev,nosuid,noexec 0 0
80
81
82 > USE flags that apply to udev?
83
84 [ebuild R ] sys-fs/udev-171-r10
85 USE="gudev hwdb introspection keymap rule_generator
86 -action_modeswitch -build -debug -edd (-extras) -floppy (-selinux) {-test}"
87
88 > --
89 > Alan McKinnon
90 > alan.mckinnon@×××××.com
91
92 --
93 Alan Mackenzie (Nuremberg, Germany).

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Re: [gentoo-user] Kernel 3.7.9: Lots of devices are root root rw-------. Alan McKinnon <alan.mckinnon@×××××.com>