Ah, okay, I see. submission_max_mail_size should be defined as uoff_t instead of size_t in struct submission_settings and struct submission_settings.

On 20 Jul 2019, at 1.47, Joseph Tam via dovecot <dovecot@dovecot.org> wrote:

Looking further into this segfault at

settings-parser.c:setting_copy():1519 *dest_size = *src_size;

*src_size points to type size_t (typedef unsigned long), a 4-byte aligned value consistent with a 32-bit build. This is mismatched with declared type

(gdb) whatis src_size type = const uoff_t * (gdb) whatis uoff_t type = unsigned long long (gdb) p sizeof(uoff_t) $1 = 8

resulting in the segfault when *src_size is dereferened. The implied condition of this code segment is typeof(uoff_t)==typeof(size_t) which is clearly not the case.

I'm not sure how/if uoff_t is defined, but configure reports

checking for uoff_t... no checking type of off_t... long long

The latter is weird, because if I compile and run using the same compiler flags

#include <stdio.h> int main(void) { printf("%d %d\n",sizeof(long long),sizeof(off_t)); }

the output is "8 4".

Joseph Tam <jtam.home@gmail.com>