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Date: Sat, 27 Apr 2013 15:31:46 +0200 From: Paolo Bonzini <pbonzini@...hat.com> To: unlisted-recipients:; (no To-header on input) CC: linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org, corbet@....net, Tejun Heo <tj@...nel.org>, "James E.J. Bottomley" <JBottomley@...allels.com>, Jens Axboe <axboe@...nel.dk> Subject: PING^5 aka New ways to attract attentions Re: [PATCH v2 00/14] Corrections and customization of the SG_IO command whitelist (CVE-2012-4542) PING^5 So a blatant attempt at getting attention from LWN didn't work. I'm desperate, so... ... look! I'm top posting! Paolo Il 17/04/2013 14:26, Paolo Bonzini ha scritto: > And a fourth ping comes... > > Jon, the next time I read "it seems likely to be picked up fairly soon" > (http://lwn.net/Articles/535075/), I'll picture the author of the patch > attempting open-heart surgery on a long-red-haired voodoo doll! > > Paolo > > Il 04/04/2013 20:18, Paolo Bonzini ha scritto: >> 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(-) >>>>> >>>> >>> >> > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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