bogofilter closing stdin prematurely in passthrough mode

[Jonathan Kamens]

Yes, this is what I was going to say but Matthias beat me to it.

On September 21, 2025 5:58:47 PM EDT, Matthias Andree via bogofilter <bogofilter at bogofilter.org> wrote:
>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
>
>
>
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