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<div>Hi Patrick,</div>
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<div>Try 'dis' command, like:</div>
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crash> dis 0xffffffffa4099980<br>
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<div><span style="font-size: 13pt;">Li Yueyi</span></div>
<div><span style="font-size: 13pt;">Send by my mobile phone.</span></div>
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在 2021年3月5日，16:19，Agrain Patrick <patrick.agrain@al-enterprise.com> 写道：<br>
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<p class="MsoNormal">Hello all,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">Target runs a CentOS8 kernel with KASLR enabled.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I triggered a crash on it for training purpose with ‘echo c > /proc/sysrq-trigger’.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I analyze the produced dumpfile on another machine where I setup all sources and required debuginfo packages.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">So far, so good, the backtrace list is complete.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">But I tried to match address to symbol, I have something like that (e.g. for proc_reg_write() ):<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Courier New"">crash> info address proc_reg_write<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Courier New"">Symbol "proc_reg_write" is a function at address 0xffffffffa4099980.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Courier New"">crash> info symbol 0xffffffffa4099980<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Courier New"">No symbol matches 0xffffffffa4099980.</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Is there a more ‘elegant’ way to retrieve the symbol from address than to perform an ‘objdump’ request on the vmlinux.debug binary ?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Have I missed an option for a command ?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Note: I get the same behavior with ‘crash --kaslr auto’ than with ‘crash’.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Thanks.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Best regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Patrick Agrain<o:p></o:p></span></p>
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