Bugzilla will be upgraded to version 5.0 on a still to be determined date in the near future. The original upgrade date has been delayed.
Bug 253000 - dmraid segfault on big-endian platforms
dmraid segfault on big-endian platforms
Product: Red Hat Enterprise Linux 4
Classification: Red Hat
Component: dmraid (Show other bugs)
All Linux
medium Severity medium
: ---
: ---
Assigned To: Heinz Mauelshagen
Corey Marthaler
: Reopened
Depends On:
Blocks: 278341
  Show dependency treegraph
Reported: 2007-08-16 11:26 EDT by Bryn M. Reeves
Modified: 2018-10-19 19:32 EDT (History)
5 users (show)

See Also:
Fixed In Version: RHBA-2007-0881
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2007-11-15 11:10:14 EST
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
patch against upstream, applies cleanly to dmraid-1.0.0.rc13 (302 bytes, patch)
2007-08-16 11:26 EDT, Bryn M. Reeves
no flags Details | Diff

External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2007:0881 normal SHIPPED_LIVE dmraid bug fix update 2007-11-14 14:33:23 EST

  None (edit)
Description Bryn M. Reeves 2007-08-16 11:26:20 EDT
Description of problem:
The dmraid format handlers may need to byteswap on-disk data structures while
reading or writing. The nvidia handler accomplishes this by defining a to_cpu
function when built on these archs.

There is a typo in the current version of the code that causes a segfault when
probing devices:

static void to_cpu(void *meta)
        struct nv *nv = meta;
        unsigned int i = NV_SIGNATURES;
        struct nv_array_base *array = &nv->array;


        while (i--); <--

That semicolon causes us to exit the loop with i == 2^32 -1 and segfault
on the access to signatures[i], e.g:

(gdb) run -i -a y
Starting program: /usr/src/redhat/BUILD/dmraid/1.0.0.rc14/tools/dmraid
-i -a y

Program received signal SIGSEGV, Segmentation fault.
0x0000000080016eba in to_cpu (meta=Variable "meta" is not available.
) at ./datastruct/byteorder.h:32
32      {
(gdb) bt
#0  0x0000000080016eba in to_cpu (meta=Variable "meta" is not available.
) at ./datastruct/byteorder.h:32
#1  0x0000000080009d9a in read_raid_dev (lc=0x80030270, di=0x800305c0,
f_read_metadata=Variable "f_read_metadata" is not available.
) at format/format.c:433
#2  0x000000008001746e in nv_read (lc=Variable "lc" is not available.
) at format/ataraid/nv.c:208
#3  0x000000008000ba7e in dmraid_read (lc=0x80030270, di=0x800305c0,
type=FMT_RAID) at metadata/metadata.c:596
#4  0x000000008000bdcc in discover_raid_devices (lc=0x80030270,
devices=0x0) at
#5  0x0000000080005078 in perform (lc=0x80030270, argv=0x3fffffff9c8) at
#6  0x000000008000438c in main (argc=4, argv=0x3fffffff9c8) at dmraid.c:34
(gdb) quit

Attached patch has been tested successfully on s390x & submitted upstream.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. dmraid -ay
Actual results:
# dmraid -ay
Segmentation Fault

Expected results:
# dmraid -ay
No RAID disks

Additional info:
Low impact on s390 since these don't typically have fakeraid hardware ;)

On PPC the problem is probably more important since these can use these types of
RAID card.

Same problem exists upstream & in RHEL5 - will clone as appropriate.
Comment 1 Bryn M. Reeves 2007-08-16 11:26:21 EDT
Created attachment 161662 [details]
patch against upstream, applies cleanly to dmraid-1.0.0.rc13
Comment 2 Bryn M. Reeves 2007-08-22 12:12:23 EDT
Problem & fix now also confirmed on ppc/ppc64
Comment 4 Heinz Mauelshagen 2007-08-23 09:50:12 EDT

thanks for the patch.
Comment 5 RHEL Product and Program Management 2007-08-23 10:05:30 EDT
This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux maintenance release.  Product Management has requested
further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products.  This request is not yet committed for inclusion in an Update
Comment 14 Chris Ward 2007-10-03 08:51:02 EDT
Bryn, QE here. Could you please submit a log verifying that this bug has been
fixed? Just the console output of before/after upgrade of the pkg is all that's
Comment 16 errata-xmlrpc 2007-11-15 11:10:14 EST
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.


Note You need to log in before you can comment on or make changes to this bug.