On Sunday, February 24, 2013, Abu Rasheda  wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">I am trying to dump some kernel data structure (walk e.g. task or file data structure  on x86_64 arch). Sometime accessing through a pointer, pointer may not be NULL, but pointing to invalid address due to garbage value.<div>

<br></div><div>What I am looking for is range of address which are valid for kernel data structure. Is it correct to say following address are valid ?</div><div><br></div><div>- Bit 0 - 47 are considered</div><div>- Between FFFF8000&#39;00000000 through FFFFFFFF&#39;FFFFFFFF</div>
</div></blockquote><div><br></div><div>Will this cover all situations</div><div><br></div><div><span></span> <font><span style="line-height:normal;background-color:rgba(255,255,255,0)">if (long_ptr &gt; 0x1000)</span></font></div>
<font><span style="line-height:normal;background-color:rgba(255,255,255,0)">  {<br>   tmp_long_ptr = ((long_ptr &amp; 0x800000000000) ? (long_ptr | 0xffff800000000000) : (long_ptr &amp; 0xFFFFFFFFFFFF));<br>printf(&quot;tmp_long_ptr :0x%llx\n&quot;, (long long int) tmp_long_ptr);<br>
   if ((long_ptr == tmp_long_ptr) &amp; (long_ptr &gt;= 0x30000000))<br>      printf(&quot;valid 64 addr\n&quot;);<br>  }</span></font>