Public bug reported:
SRU Justification
[Impact]
* Request from Microsoft to address potential memory coherence issue in
MANA driver where memory read in DMA-coherent region is read twice and
could possibly change between invocations. Rather, the memory should be
read into a local variable, and passed to the second function by
parameter, rather than re-reading from memory.
[Fix]
* Resolute:
- Clean cherry-pick of linux-next patches:
- 35f0f0a2536a: "net: mana: Fix TOCTOU double-fetch of hwc_msg_id from
DMA buffer"
[Test Plan]
* Compile tested
* Boot tested
* Microsoft tested
[Regression potential]
* Patches isolated to MANA specifically. Possibly regression could
result in unexpected behavior of MANA driver.
[Other info]
* SF#00438816
** Affects: linux-azure (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2156472
Title:
net: mana: Fix TOCTOU double-fetch of hwc_msg_id from DMA buffer
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