bogofilter closing stdin prematurely in passthrough mode

[Matthias Andree]

Am 21.09.25 um 13:03 schrieb Tomaž Šolc via bogofilter:
> Hi
>
> I have a bogofilter setup where procmail pipes messages through 
> bogofilter for sorting. I've been looking into a problem where a 
> certain email causes procmail to error out ("error while writing to 
> bogofilter") and repeatedly defer the delivery.
>
> It appears that the reason is that bogofilter prematurely closes stdin 
> and exits while procmail still has bytes to write. Indeed, if I just 
> cat the offending email through "bogofilter -p" the email printed on 
> stdout is truncated somewhere in the middle.
>
> Otherwise bogofilter appears to work normally. It doesn't return an 
> error code. There's no segfault. The only weird thing I see is that if 
> I do a strace it attempts to do an invalid seek on fd=0 before it 
> exits, but this might be benign.
>
> I think the email is hitting somekind of a token or input buffer 
> limit. It has a few very long sequences of U+3164 "HANGUL FILLER" 
> characters. I've been able to reproduce the problem by creating an 
> email with such a sequence. Bogofilter cuts it off after 3640 
> characters (but, for example, it will not cut off an identical email 
> with an ascii "a" instead of U+3164).
>
> This is with bogofilter 1.2.5 as packaged in Debian Bookworm.
>
> I'll check if the same issue appears with 1.3.0 once I get it running. 


Tomaž, thanks for the report.

I believe 1.3.0 is bound to fix that, as the result of reports from - 
among others - Jonathan Kamens (Gitlab issues #7 and #11) in the beta phase,
and if you want to avoid messing with the 1.3.0 build if that's too 
troublesome, you can also send me your reduced test case off-list and I 
can test it.

Regards,
Matthias