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Do not label any files in the udev runtime directory, but only nodes,
links and directories below /dev.
In case the runtime directory falls back to /dev/.udev, label this
directory once at udevd startup, but never anything below it.
We should bind the udev socket from systemd, so we are sure
that the abstract namespace socket is always bound by a root
process and there is never a window during an update where
an untrusted process can steal our socket.
Also split the udev.service file, so that the daemon can be
updated/restarted without triggering any coldplug events.
We need to preserve the database of network interfaces while we
rename them. Use the kernel's numbers wherever possible, instead
of the device names.
Fix wrong database filenames which contain a '/', translated
from '!' in the kernel name.
Fix segfault for kobject pathes where the subsystem can not be
determined from sysfs.
Renaming network devices might delay events for the other device, which has
the same devpath in the meantime as the original event. Causing a delay until
the timout of the event is reached.
Look at the ifindex/devnum of the devices to check if they are really
the same devices.
Harald Hoyer discovered some incorrect behavior while debugging
problems with network interface renaming:
Udev events might be queued for devices which are renamed. A new
device registered the same time may claime the old name and create
a database entry for it. The current rename logic would move over
this databse entry to the wrong device.
CC udev/udevd.o
In file included from udev/udev.h:27,
from udev/udevd.c:47:
./libudev/libudev-private.h: In function ‘udev_selinux_setfscreateconat’:
./libudev/libudev-private.h:230: warning: declaration of ‘dirfd’ shadows a global declaration
/usr/include/dirent.h:224: warning: shadowed declaration is here
Signed-off-by: Yin Kangkai <kangkai.yin@intel.com>
Signed-off-by: Martin Pitt <martin.pitt@ubuntu.com>
We can not predict the major/minor of non-existing devices:
$ grep . /sys/class/block/sd*/dev
/sys/class/block/sda1/dev:259:524288
/sys/class/block/sda2/dev:259:262144
/sys/class/block/sda3/dev:259:786432
/sys/class/block/sda4/dev:259:131072
/sys/class/block/sda/dev:259:0
/sys/class/block/sdb/dev:259:655360
/sys/class/block/sdc/dev:259:393216
If this functionality is still needed for some broken hardware, it needs to be
solved with a tool not part of the udev package. Because such option is unreliable
and unsafe to use.
Recent udisks versions, for LVM2 integration, ships with probers that
produce very long lines such as
UDISKS_LVM2_PV_VG_PV_LIST=
uuid=98lyZl-Ya7U-p26Z-Ia7b-xf8u-xZqP-jc4njb;size=2000397795328;allocated_size=2000397795328
uuid=iFs0cM-sxCF-ceQK-hZl1-kbwo-ZTjq-gSewQR;size=2000397795328;allocated_size=2000397795328
[...]
e.g. roughly 100 bytes per LVM2 physical volume for each LVM2
PV encountered.
Signed-off-by: David Zeuthen <davidz@redhat.com>
This function is useful for anything that's likely to be running
alongside udevd during cold-plugging, and is using libudev to
receive the events.
It makes little sense for it to be private, or to require other
software to relearn how to adjust the buffer size.
Signed-off-by: Scott James Remnant <scott@ubuntu.com>
It handles only RUN but not IMPORT and PROGRAM. There is no sane way
to suppress program execution. Most important programs run with IMPORT
these days. Also events can no longer suppressed with the libudev
netlink messages, so UDEV_RUN does nothing useful and is just
inconsistent.
With well defined and kernel-supplied node names, we no longer need
to support a possible stack of conflicting symlinks and node names.
Only symlinks with identical names can be claimed by multiple devices.
This shrinks the former /dev/.udev/names/ significantly.
Also the /dev/{block,char}/MAJ:MIN" links are excluded from the name
stack - they are unique and can not conflict.
External programs triggered by events (via RUN=) will inherit udev's
signal mask, which is set to block all but SIGALRM. For most utilities,
this is OK, but if we start daemons from RUN=, we run into trouble
(especially as SIGCHLD is blocked).
This change saves the original sigmask when udev starts, and restores it
just before we exec() the external command.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
With very deeply nested devices, We can not use a single file
name to carry an entire DEVPATH. Use <subsystem>:<sysname> as
the database filename, which should also simplify the handling
of devices moving around, as these values will not change but
still be unique.
For the name stack we use the <maj>:<min> now as the filename.
> On Tue, Aug 18, 2009 at 09:59:56AM -0400, Ric Wheeler wrote:
> The first is that udev grumbles during boot about "file name too long"
> like the following:
>
> Aug 17 06:49:58 megadeth udevd-event[20447]: unable to create db file
> '/dev/.udev/db/\x2fdevices\x2fpci0000:00\x2f0000:00:04.0\x2f0000:17:00.0\x2f0000:18:0a.0\x2f0000:1f:00.0\x2fhost11\x2fport-11:0\x2fexpander-11:0\x2fport-11:0:0\x2fexpander-11:1\x2fport-11:1:0\x2fexpander-11:2\x2fport-11:2:17\x2fexpander-11:3\x2fport-11:3:1\x2fend_device-11:3:1\x2fbsg\x2fend_device-11:3:1':
> File name too long
