Bug 1334316 (CVE-2016-4568) - CVE-2016-4568 kernel: videobuf2-v412: Planes array amount not verified in buffer dequeueing
Summary: CVE-2016-4568 kernel: videobuf2-v412: Planes array amount not verified in buf...
Status: NEW
Alias: CVE-2016-4568
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Whiteboard: impact=low,public=20160507,reported=2...
Keywords: Security
Depends On: 1334317
TreeView+ depends on / blocked
Reported: 2016-05-09 11:38 UTC by Andrej Nemec
Modified: 2019-02-08 15:01 UTC (History)
27 users (show)

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Last Closed:

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Description Andrej Nemec 2016-05-09 11:38:21 UTC
 When a buffer is being dequeued using VIDIOC_DQBUF IOCTL, the exact buffer which will be dequeued is not known until the buffer has been removed from the queue. The number of planes is specific to a buffer, not to the queue.
This does lead to the situation where multi-plane buffers may be requested and queued with n planes, but VIDIOC_DQBUF IOCTL may be passed an argument struct with fewer planes.
__fill_v4l2_buffer() however uses the number of planes from the dequeued videobuf2 buffer, overwriting kernel memory (the m.planes array allocated in video_usercopy() in v4l2-ioctl.c)  if the user provided fewer planes than the dequeued buffer had.



Upstream fix:


Introduced by:


Comment 1 Andrej Nemec 2016-05-09 11:39:26 UTC
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1334317]

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