[SRU][Xenial][Zesty][Artful][azure][PATCH 0/1] CIFS: Fix maximum SMB2 header size

Joseph Salisbury joseph.salisbury at canonical.com
Fri Sep 8 13:06:10 UTC 2017


BugLink: http://bugs.launchpad.net/bugs/1713884

== SRU Justification ==
Currently the maximum size of SMB2/3 header is set incorrectly which
leads to hanging of directory listing operations on encrypted SMB3
connections. Fix this by setting the maximum size to 170 bytes that
is calculated as RFC1002 length field size (4) + transform header
size (52) + SMB2 header size (64) + create response size (56).

This bug is fixed by commit 9e37b1784f2be9397a903307574ee565bbadfd75 which is in 
mainline as of 4.13 final.    

Commit 9e37b1784f2b is needed in Vivid as well.  However, there are context diffs
from X, Z and A, so it's SRU will be sent separatly.


== Fix ==
commit 9e37b1784f2be9397a903307574ee565bbadfd75
Author: Pavel Shilovsky <pshilov at microsoft.com>
Date:   Thu Aug 24 15:16:40 2017 -0700

    CIFS: Fix maximum SMB2 header size

== Regression Potential ==
Patch is specific to to CIFS and only increases MAX_SMB2_HDR_SIZE.

Patch submitted to kernel stable trees, so it will also be reivewed by a wider audience 
upstream.

== Test Case ==
A test kernel was built with this patch and tested by the original bug reporter.
The bug reporter states the test kernel resolved the bug.


Pavel Shilovsky (1):
  CIFS: Fix maximum SMB2 header size

 fs/cifs/smb2pdu.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

-- 
2.7.4





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