** Changed in: linux (Ubuntu Trusty)
Status: Triaged => Fix Committed
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https://bugs.launchpad.net/bugs/1742480
Title:
[Hyper-V] storvsc: do not assume SG list is continuous when doing
bounce buffers
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Trusty:
Fix Committed
Bug description:
All linux kernels 4.1 and prior use bounce buffers, and there is a
data corruption vulnerability on Hyper-V without the following patch.
storvsc checks the SG list for gaps before passing them to Hyper-v device.
If there are gaps, data is copied to a bounce buffer and a continuous data
buffer is passed to Hyper-V.
The check on gaps assumes SG list is continuous, and not chained. This is
not always true. Failing the check may result in incorrect I/O data
passed to the Hyper-v device.
This code path is not used post Linux 4.1.
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