[Dovecot] Segfault when opening a public folder, dovecot 1.1 beta4

[Timo Sirainen]

On Sun, 2007-10-28 at 09:25 -0400, Adam McDougall wrote:
>   >     userdb passwd {
>   >       args = system_user=
>   >     }

This works only with v1.1. v1.0 just ignores it.

>   Looks like it overrides the system_user with empty value and Dovecot
>   ends up calling initgroups(""). I'm not sure what that does, if
>   anything. This fixes it: http://hg.dovecot.org/dovecot/rev/7f2501b3e993
> 
> Upon some further testing, this patch doesn't seem to do anything, because 
> for some reason 1.1 allows me to login when I am in too many groups, but 
> 1.0 fails (this is where I saw the errors), and both versions seem to act the same
> with or without the patch.  When I use mail_executable to run a shell script to 
> report group membership, on both servers I still see the full list when using
> system_user=   and mail_extra_groups but I don't see the group I set in mail_extra_groups.
> I'm not sure what to think, is there a good place to stick in some debugging?

Have you set mail_drop_priv_before_exec=yes? If not, it should still be
running as root in your mail_executable. If it's "no", I'm not really
sure..

auth_debug=yes at least shows what auth process sends to master. It
should show empty system_user.

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