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Is it possible to use crash to modify kernel memory in Linux?

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I am trying to use crash utility to modify a kernel memory from 2 to 0, but I hit an error like this,

`crash> rd ffffffffc0704310ffffffffc0704310:  0000000000000002                    ........crash>crash> wr -k ffffffffc0704310 0wr: cannot write to /proc/kcore`

Is it possible to modify kernel memory with crash in live kernel debugging mode? If so, what shall I do?


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