Bug 2058395 (CVE-2022-0854) - CVE-2022-0854 kernel: swiotlb information leak with DMA_FROM_DEVICE
Summary: CVE-2022-0854 kernel: swiotlb information leak with DMA_FROM_DEVICE
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2022-0854
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2059701 2059702 2059703 2059704 2066077
Blocks: 2058396
TreeView+ depends on / blocked
 
Reported: 2022-02-24 19:23 UTC by Pedro Sampaio
Modified: 2022-12-05 11:33 UTC (History)
50 users (show)

Fixed In Version: Linux kernel 5.17-rc8
Doc Type: If docs needed, set a value
Doc Text:
A memory leak flaw was found in the Linux kernel’s DMA subsystem, in the way a user calls DMA_FROM_DEVICE. This flaw allows a local user to read random memory from the kernel space.
Clone Of:
Environment:
Last Closed: 2022-12-05 11:33:23 UTC

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2022:7444 0 None None None 2022-11-08 09:09:41 UTC
Red Hat Product Errata RHSA-2022:7683 0 None None None 2022-11-08 10:08:50 UTC
Red Hat Product Errata RHSA-2022:7933 0 None None None 2022-11-15 09:44:38 UTC
Red Hat Product Errata RHSA-2022:8267 0 None None None 2022-11-15 10:47:12 UTC

Description Pedro Sampaio 2022-02-24 19:23:23 UTC 
A flaw was found in the Linux kernel. Information leak may occur through swiotlb.
Comment 6 Alex 2022-03-20 14:28:42 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2066077]
Comment 9 Salvatore Bonaccorso 2022-03-21 13:42:35 UTC 
Can you confirm that this CVE is meant for the issues fixed by ddbd89deb7d3 ("swiotlb: fix info leak with DMA_FROM_DEVICE") in 5.17-rc6 and the required followup aa6f8dcbab47 ("swiotlb: rework "fix info leak with DMA_FROM_DEVICE"") in 5.17-rc8?
Comment 10 Alex 2022-03-22 10:37:22 UTC 
In reply to comment #9:
> Can you confirm that this CVE is meant for the issues fixed by ddbd89deb7d3
> ("swiotlb: fix info leak with DMA_FROM_DEVICE") in 5.17-rc6 and the required
> followup aa6f8dcbab47 ("swiotlb: rework "fix info leak with
> DMA_FROM_DEVICE"") in 5.17-rc8?

Yes, I think that the patch for this one is
aa6f8dcbab47 "swiotlb: rework "fix info leak with DMA_FROM_DEVICE"".

The way to apply it described:
https://lore.kernel.org/all/YiIiHD7uA1o7Sj1X@kroah.com/t/
, so "IMHO the cleanest way to do this is a reverting the incorrect version of the patch and applying the correct one",
where
"Revert "swiotlb: fix info leak with DMA_FROM_DEVICE"
  swiotlb: fix info leak with DMA_FROM_DEVICE

 Documentation/core-api/dma-attributes.rst |  8 --------
 include/linux/dma-mapping.h               |  8 --------
 kernel/dma/swiotlb.c                      | 23 +++++++++++++++--------
 3 files changed, 15 insertions(+), 24 deletions(-)
"

and then apply
aa6f8dcbab47 "swiotlb: rework "fix info leak with DMA_FROM_DEVICE"".


Looking to the noted ddbd89deb7d3 that is noted inside aa6f8dcbab47 as "Fixes:"
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=v5.17&id=aa6f8dcbab473f3a3c7454b74caa46d36cdc5d13
, this one aa6f8dcbab47 is the same at least if looking to the line
"kernel/dma/swiotlb.c                      | 23 +++++++++++++++--------",
means the same like revert described here https://lore.kernel.org/all/YiIiHD7uA1o7Sj1X@kroah.com/t/
, so yes actually ddbd89deb7d3 does incorrect fix and then can apply aa6f8dcbab47 that does both revert and correct fix.

If you get any more info during applying patches, please let us know here. Thank you.
Comment 11 Justin M. Forbes 2022-03-23 14:17:36 UTC 
Yhis was fixed for Fedora with the 5.16.15 stable kernel updates.
Comment 15 errata-xmlrpc 2022-11-08 09:09:37 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2022:7444 https://access.redhat.com/errata/RHSA-2022:7444
Comment 16 errata-xmlrpc 2022-11-08 10:08:46 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2022:7683 https://access.redhat.com/errata/RHSA-2022:7683
Comment 17 errata-xmlrpc 2022-11-15 09:44:34 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2022:7933 https://access.redhat.com/errata/RHSA-2022:7933
Comment 18 errata-xmlrpc 2022-11-15 10:47:08 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2022:8267 https://access.redhat.com/errata/RHSA-2022:8267
Comment 19 Product Security DevOps Team 2022-12-05 11:33:18 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2022-0854
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