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<p class=MsoNormal>Hello,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I’ve come across another SMB2 locking issue that I can’t
find explicit documentation for in MS-SMB2 (v18.0).<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>My first question, is whether a single SMB_LOCK request can
contain both unlock and lock requests as the LockingAndX command type in SMBv1
could? The MS-SMB2 document hints that the answer to this question is “no”
but it doesn’t seem to explicitly state it anywhere.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Section 2.2.26 states: “The SMB2 LOCK Request packet
is sent by the client to either lock or unlock portions of a file.” <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>This statement is ambiguous as to whether the “or”
is inclusive or exclusive.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>In my testing, sending both lock and unlock requests in a
single SMB2 locking request returns a STATUS_INVALID_PARAMETER. However,
if the requests are ordered such that a unlock structure come first, the unlock
request seems to succeed.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>The attached pcap, against W2K8R2 shows:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>1) Packet 27-28: A single lock request succeeding on
range 0-10.<o:p></o:p></p>
<p class=MsoNormal>2) Packet 29-30: A lock request with unlock(0-10) and
lock(10-10) failing with INVALID_PARAMETER.<o:p></o:p></p>
<p class=MsoNormal>3) Packet 31-32: A lock request with lock(0-10) and
lock(10-10) succeeding, showing that the previous request, though it returned
an error, succeeded in unlocking.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>It seems to me the server behavior should be to return
STATUS_INVALID_PARAMETER without completing any of the lock/unlock requests
when they are mixed. Both the fact that this isn’t allowed, and the
W2K8R2 behavior deviation should be documented.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks,<o:p></o:p></p>
<p><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>Steven Danneman</span></b><b><span style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:#666666'> </span></b><b><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#2676AE'>|</span></b><b><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#666666'> <strong><span
style='font-family:"Arial","sans-serif"'>Software Development Engineer</span></strong><br>
</span></b><b><span style='font-size:8.0pt;font-family:"Arial","sans-serif";
color:black'>Isilon Systems</span></b><b><span style='font-size:7.5pt;
font-family:"Arial","sans-serif";color:#666666'> P </span></b><b><span
style='font-size:7.5pt;font-family:"Arial","sans-serif";color:black'>+1-206-315-7500</span></b><b><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#666666'> </span></b><b><span
style='font-size:7.5pt;font-family:"Arial","sans-serif";color:#666666'>
F </span></b><b><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:black'>+1-206-315-7501</span></b><b><span style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:#666666'><br>
</span></b><b><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:#003366'><a href="http://www.isilon.com">www.isilon.com</a></span></b><b><span
style='font-size:7.5pt;font-family:"Arial","sans-serif";color:#666666'> </span></b><b><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#666666'> </span></b><b><span
style='font-size:7.5pt;font-family:"Arial","sans-serif";color:#666666'> </span></b><b><span
style='font-size:7.5pt;font-family:"Arial","sans-serif";color:black'> </span></b><b><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#666666'> </span></b><b><span
style='font-size:7.5pt;font-family:"Arial","sans-serif";color:#666666'> </span></b><b><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#666666'><o:p></o:p></span></b></p>
<p style='vertical-align:middle'><span style='color:navy'><img border=0
width=82 height=46 id="Picture_x0020_1" src="cid:image001.gif@01CA71D5.D545E1E0"
alt="cid:image001.gif@01C81005.1792D9C0"></span><span style='color:navy'> </span><b><span
style='color:#666666'> </span></b><strong><span style='font-size:
10.0pt;font-family:"Arial","sans-serif";color:#666666'>How breakthroughs begin.
™</span></strong><o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
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