PING^3 Re: [PATCH v2 00/14] Corrections and customization of theSG_IO command whitelist (CVE-2012-4542)

[Paolo Bonzini]

Il 22/03/2013 23:30, Paolo Bonzini ha scritto:
> Il 20/02/2013 17:12, Paolo Bonzini ha scritto:
>> Il 06/02/2013 16:15, Paolo Bonzini ha scritto:
>>> This series regards the whitelist that is used for the SG_IO ioctl.  This
>>> whitelist has three problems:
>>>
>>> * the bitmap of allowed commands is designed for MMC devices (roughly,
>>>   "play/burn CDs without requiring root") but some opcodes overlap across SCSI
>>>   device classes and have different meanings for different classes.
>>>
>>> * also because the bitmap of allowed commands is designed for MMC devices
>>>   only, some commands are missing even though they are generally useful and
>>>   not insecure.  At least not more insecure than anything else you can
>>>   do if you have access to /dev/sdX or /dev/stX nodes.
>>>
>>> * the whitelist can be disabled per-process but not per-disk.  In addition,
>>>   the required capability (CAP_SYS_RAWIO) gives access to a range of other 
>>>   resources, enough to make it insecure.
>>>
>>> The series corrects these problems.  Patches 1-4 solve the first problem,
>>> which also has an assigned CVE, by using different bitmaps for the various
>>> device classes.  Patches 5-11 solve the second by adding more commands
>>> to the bitmaps.  Patches 12 and 13 solve the third, and were already
>>> posted but ignored by the maintainers despite multiple pings.
>>>
>>> Note: checkpatch hates the formatting of the command table.  I know about this,
>>> and ensured that there are no errors in the rest of the code.  The current
>>> formatting is IMHO quite handy, and roughly based on the files available
>>> from the SCSI standard body.
>>>
>>> Ok for the next merge window?
>>>
>>> Paolo
>>>
>>> v1->v2: remove 2 MMC commands and 6 SBC commands (see patches 6 and 9
>>>         for details).  Added patch 14 and added a few more scanner
>>>         commands based on SANE (scanners are not whitelisted by default,
>>>         also were not in v1, but this makes it possible to opt into the
>>>         whitelist out of paranoia).  Removed C++ comments.  Removed the
>>>         large #if 0'd list of commands that the kernel does not pass
>>>         though.  Marked blk_set_cmd_filter_defaults as __init.
>>
>> Ping...
>>
>> Jens/James, is anyone going to pick this up for 3.9?
> 
> Another month has passed, Ping^2...

Ping^3, any hope for 3.10?

Paolo

> 
> Paolo
> 
>> Paolo
>>
>>>
>>> Paolo Bonzini (14):
>>>   sg_io: pass request_queue to blk_verify_command
>>>   sg_io: reorganize list of allowed commands
>>>   sg_io: use different default filters for each device class
>>>   sg_io: resolve conflicts between commands assigned to multiple
>>>     classes (CVE-2012-4542)
>>>   sg_io: whitelist a few more commands for rare & obsolete device types
>>>   sg_io: whitelist another command for multimedia devices
>>>   sg_io: whitelist a few more commands for media changers
>>>   sg_io: whitelist a few more commands for tapes
>>>   sg_io: whitelist a few more commands for disks
>>>   sg_io: whitelist a few obsolete commands
>>>   sg_io: mark blk_set_cmd_filter_defaults as __init
>>>   sg_io: remove remnants of sysfs SG_IO filters
>>>   sg_io: introduce unpriv_sgio queue flag
>>>   sg_io: use unpriv_sgio to disable whitelisting for scanners
>>>
>>>  Documentation/block/queue-sysfs.txt |    8 +
>>>  block/blk-sysfs.c                   |   33 +++
>>>  block/bsg.c                         |    2 +-
>>>  block/scsi_ioctl.c                  |  369 ++++++++++++++++++++++++++---------
>>>  drivers/scsi/scsi_scan.c            |   14 ++-
>>>  drivers/scsi/sg.c                   |    6 +-
>>>  include/linux/blkdev.h              |    8 +-
>>>  include/linux/genhd.h               |    9 -
>>>  include/scsi/scsi.h                 |    3 +
>>>  9 files changed, 344 insertions(+), 108 deletions(-)
>>>
>>
> 

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