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DescriptionJonathan Earl Brassow
2012-09-07 19:22:09 UTC
The 'rebuild' parameter takes an index as an argument - an index that starts at '0'. However, the code that checks this value is checking for 'value > raid_disks'. This means that if 'value == raid_disks' and 'value' is used to access the device array, the bounds of the array will be blown - potentially causing a kernel panic. It certainly won't work as expected.
This check needs to be changed to 'value >= raid_disks'.
Currently, things work as follows:
[root@hayes-01 ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/etherd/e1.1p1 vg lvm2 a-- 648.73g 648.73g
/dev/etherd/e1.1p2 vg lvm2 a-- 648.73g 648.73g
/dev/etherd/e1.1p3 vg lvm2 a-- 648.73g 648.73g
/dev/etherd/e1.1p4 vg lvm2 a-- 648.73g 648.73g
/dev/etherd/e1.1p5 vg lvm2 a-- 648.73g 648.73g
/dev/etherd/e1.1p6 vg lvm2 a-- 648.73g 648.73g
/dev/etherd/e1.1p7 vg lvm2 a-- 648.73g 648.73g
/dev/etherd/e1.1p8 vg lvm2 a-- 648.73g 648.73g
/dev/sda2 vg_hayes01 lvm2 a-- 74.01g 0
[root@hayes-01 ~]# vgs vg
VG #PV #LV #SN Attr VSize VFree
vg 8 0 0 wz--n- 5.07t 5.07t
[root@hayes-01 ~]# lvcreate --type raid1 -m 1 -L 200M -n lv vg
Logical volume "lv" created
[root@hayes-01 ~]# dmsetup table vg-lv
0 409600 raid raid1 3 0 region_size 1024 2 253:3 253:4 253:5 253:6
[root@hayes-01 ~]# echo "0 409600 raid raid1 3 0 region_size 1024 2 253:3 253:4 253:5 253:6"
0 409600 raid raid1 3 0 region_size 1024 2 253:3 253:4 253:5 253:6
[root@hayes-01 ~]# echo "0 409600 raid raid1 5 0 region_size 1024 rebuild 2 2 253:3 253:4 253:5 253:6" | dmsetup load vg-lv
^^^^^^^^ No detection of the bad input!!
This is how things should work:
[root@hayes-01 ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/etherd/e1.1p1 vg lvm2 a-- 648.73g 648.73g
/dev/etherd/e1.1p2 vg lvm2 a-- 648.73g 648.73g
/dev/etherd/e1.1p3 vg lvm2 a-- 648.73g 648.73g
/dev/etherd/e1.1p4 vg lvm2 a-- 648.73g 648.73g
/dev/etherd/e1.1p5 vg lvm2 a-- 648.73g 648.73g
/dev/etherd/e1.1p6 vg lvm2 a-- 648.73g 648.73g
/dev/etherd/e1.1p7 vg lvm2 a-- 648.73g 648.73g
/dev/etherd/e1.1p8 vg lvm2 a-- 648.73g 648.73g
/dev/sda2 vg_hayes01 lvm2 a-- 74.01g 0
[root@hayes-01 ~]# vgs vg
VG #PV #LV #SN Attr VSize VFree
vg 8 0 0 wz--n- 5.07t 5.07t
[root@hayes-01 ~]# lvcreate --type raid1 -m 1 -L 200M -n lv vg
Logical volume "lv" created
[root@hayes-01 ~]# dmsetup table vg-lv
0 409600 raid raid1 3 0 region_size 1024 2 254:3 254:4 254:5 254:6
[root@hayes-01 ~]# echo "0 409600 raid raid1 5 0 region_size 1024 rebuild 2 2 254:3 254:4 254:5 254:6" | dmsetup load vg-lv
device-mapper: reload ioctl on vg-lv failed: Invalid argument
Command failed
^^^^^^^^^^ Rejection of invalid input.
Comment 2RHEL Program Management
2012-09-07 19:39:03 UTC
This request was evaluated by Red Hat Product Management for
inclusion in a Red Hat Enterprise Linux release. Product
Management has requested further review of this request by
Red Hat Engineering, for potential inclusion in a Red Hat
Enterprise Linux release for currently deployed products.
This request is not yet committed for inclusion in a release.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
http://rhn.redhat.com/errata/RHSA-2013-0496.html