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Bug#1024811: linux: /proc/[pid]/stat unparsable

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Dixi quod…

>The effect is that /proc/[pid]/stat cannot be parsed the way it is
>documented, as it does not escape embedded whitespace characters;

… nor parenthesēs:

tglase@x61w:~ $ ./mk\)sh -c 'echo $$; sleep 10' &
[1] 13375
tglase@x61w:~ $ 13375
tglase@x61w:~ $ cat /proc/13375/stat
13375 (mk)sh) S 13330 13375 13330 34837 13377 4194304 124 0 0 0 0 0 0 0 20 0 1 0 59029474 2977792 180 18446744073709551615 94911056490496 94911056739789 140721459110048 0 0 0 0 0 134307847 0 0 0 17 1 0 0 0 0 0 94911056765744 94911056773808 94911059955712 140721459115917 140721459115946 140721459115946 140721459118064 0

This is… sad — extremely so. It does not escape anything.
I found proc_task_name(), which has an escape parameter,
which is set to false here, but it’s only for /status
which must escape newlines.

It’s used with false in /stat and /comm… the latter indeed
needing no escapes.

I’d argue that it needs a tristate argument, 0 for /comm
to not escape anything, 1 for /status to escape newlines,
and 2 for /stat to escape whitespace (and perhaps also a
closing parenthesis, using \x29, so splitting both using
scanf as indicated in the manpage and using parenthesēs
as people seem to do on the ’net is fixed).

bye,
//mirabilos
-- 
22:20⎜<asarch> The crazy that persists in his craziness becomes a master
22:21⎜<asarch> And the distance between the craziness and geniality is
only measured by the success 18:35⎜<asarch> "Psychotics are consistently
inconsistent. The essence of sanity is to be inconsistently inconsistent

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Bug#1024811: linux: /proc/[pid]/stat unparsable Thorsten Glaser <tg@mirbsd.de> - 2022-11-25 18:20 +0100
  Bug#1024811: linux: /proc/[pid]/stat unparsable Thorsten Glaser <tg@debian.org> - 2022-11-25 18:40 +0100
  Bug#1024811: linux: /proc/[pid]/stat unparsable Thorsten Glaser <tg@mirbsd.de> - 2022-12-22 02:10 +0100
    Bug#1024811: Re: Bug#1024811: linux: /proc/[pid]/stat unparsable Donald Buczek <buczek@molgen.mpg.de> - 2022-12-22 15:00 +0100
      Bug#1024811: Re: Bug#1024811: linux: /proc/[pid]/stat unparsable Thorsten Glaser <tg@mirbsd.de> - 2022-12-22 21:40 +0100
        Bug#1024811: linux: /proc/[pid]/stat unparsable Donald Buczek <buczek@molgen.mpg.de> - 2022-12-23 09:50 +0100
          Bug#1024811: linux: /proc/[pid]/stat unparsable Thorsten Glaser <tg@mirbsd.de> - 2022-12-23 10:00 +0100
            Bug#1024811: linux: /proc/[pid]/stat unparsable Donald Buczek <buczek@molgen.mpg.de> - 2022-12-23 10:20 +0100

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