Re: [PATCH 0/1] RFC: Revamp admin-guide/tainted-kernels.rst to make it more comprehensible

Randy Dunlap
2018-12-20T16:42:17Z

On 12/20/18 7:23 AM, Thorsten Leemhuis wrote:
> Hi! Am 17.12.18 um 22:06 schrieb Randy Dunlap:
>> On 12/17/18 10:24 AM, Jonathan Corbet wrote:
>>> Here's an idea if you feel like improving this: rather than putting an
>>> inscrutable program inline, add a taint_status script to scripts/ that
>>> prints out the status in fully human-readable form, with the explanation
>>> for every set bit.
>> And some people prefer not adding tools that use python, perl, etc.
>
> Yeah, I know :-/ On twitter @apexo (thx!) suggested these two:
>
> dc -e"[00000000000000]n2o$(cat /proc/sys/kernel/tainted)p"|fold
> -w1|tac|nl| grep -m 18 '.'
>
> (echo -n 000000000000000;(echo obase=2;cat
> /proc/sys/kernel/tainted)|bc)|fold -w1|tac|nl| grep -m 18 '.'
>
> But it needs bc, which often is not installed by default :-/ Any as you
> mentioned already: using Perl (
>
> perl -e 'printf("%016b\n",<STDIN>)' < /proc/sys/kernel/tainted |fold
> -w1|tac|nl
>
> ) also has it downsides. Having something that works in plain bash/sh
> would be great...
>
> Nevertheless: I'm still inclined to put a one liner decode command into
> tainted-kernels.rst so people can decode the file easily even if they do
> not have attached script at hand.
>
>> E.g., I use this shell script (named 'chktaint', which could probably
>> be done better):
>
> Many thx. Find a slightly improved version attached that directly prints
> the reason. I assume that's more like what Jonathan had in mind. The
> script now is also capable of decoding a value retrieved from
> /proc/sys/kernel/tainted on another system.

Thorsten:

- drop the trailing spaces on multiple lines
- s/follwing/following/

thanks.
--
~Randy