9 Jul
2019
9 Jul
'19
3:02 a.m.
Hopefully, there is some fix for issue 3 which is beyond my skill to fix.
Issue 1) Need recent gcc version
Building Dovecot versions <=2.2.x using gcc 3.4.4 worked,
but this gcc version fails to build 2.3.x properly: symptoms
include compile failures and executable crashes that depended
on the amount of optimization used, which is usually a sign of
compiler bugs. (It could also be issue 3 in disguise.)
Either way, I updated to gcc 9.1.0.Issue 2) Cannot build with --enable-hardening
Using gcc 9.1.0, "configure" step fails because fd passing was
broken, but the real problem was a compilation failure when
"--enable-hardening" is used. Demonstration:
# echo 'int main(){char a[1]; strcpy(a,a);} ' | gcc -w -fstack-protector-strong -x c -
Undefined first referenced
symbol in file
__stack_chk_guard /var/tmp//cc12L9zV.o (symbol scope specifies local binding)
ld: fatal: symbol referencing errors. No output written to a.out
collect2: error: ld returned 1 exit status
I'm not sure if this is a Solaris10 fumble, but configuring
"--disable-hardening" removes the "-fstack-protector-strong"
compiler option, which resolves this issue.Issue 3) dovecot/doveconf segfaults on startup
It crashes here while processing dovecot.conf, as does "doveconf"
(settings-parser.c:1519 in setting_copy())
*dest_size = *src_size;
It appears *src_size is not an 8-byte address aligned (0x5597c).
It inherits this value from the calling routine as the sum of
"set" (8-byte aligned) + "def->offset"=20 => misaligned address.
(settings-parser.c:1597 in settings_dup_full())
src = CONST_PTR_OFFSET(set, def->offset);
(gdb) p set
$2 = (const void *) 0x55968
(gdb) p *def
$3 = {type = SET_SIZE, key = 0x2d548 "submission_max_mail_size", offset = 20, list_info = 0x0}
(gdb) bt full
#0 0xff190690 in setting_copy (type=SET_SIZE, src=0x5798c, dest=0xf7ed4, pool=0xf29a0,
keep_values=false) at settings-parser.c:1519
src_size = 0x5798c
dest_size = 0xf7ed4
__func__ = "setting_copy"
#1 0xff190bc4 in settings_dup_full (info=0x2d9ac <submission_setting_parser_info>, set=0x57978,
pool=0xf29a0, keep_values=false) at settings-parser.c:1600
def = 0x2d7d4 <submission_setting_defines+80>
src = 0x5798c
dest_set = 0xf7ec0
dest = 0xf7ed4
children = 0x2c
i = 1105688
count = 4279837964
#2 0xff192724 in settings_parser_dup (old_ctx=0x9ec08, new_pool=0xf29a0) at settings-parser.c:1946
new_ctx = 0x10def0
iter = 0x0
links = {_table = 0xa23c0, _key = 0xa23c0, _keyp = 0xa23c0, _const_key = 0xa23c0,
_value = 0xa23c0, _valuep = 0xa23c0}
new_link = 0x10b488
value = 0x0
key = 0x0
i = 0
parser_pool = 0x10ded8
keep_values = false
__func__ = "settings_parser_dup"
#3 0x0001fc0c in config_filter_parsers_get (ctx=0x657a8, pool=0xf29a0, modules=0x0,
filter=0x583e8, parsers_r=0xffbff9c4, output_r=0xffbff9bc, error_r=0xffbffa44)
at config-filter.c:372
src = 0xf29d8
dest = 0xf2a48
error = 0x0
error_p = 0x52cfc
i = 26
count = 33
__func__ = "config_filter_parsers_get"
#4 0x00021be4 in config_all_parsers_check (ctx=0xffbffac8, new_filter=0x657a8, error_r=0xffbffa44)
at config-parser.c:441
parsers = 0x58180
tmp_parsers = 0x4
output = {specific_services = 0xf2a20, service_uses_local = false,
service_uses_remote = false, used_local = false, used_remote = false,
permission_denied = false}
i = 0
count = 3
ssl_set = 0x4 <error: Cannot access memory at address 0x4>
global_ssl_set = 0x32188 ""
tmp_pool = 0xf29a0
ssl_warned = false
ret = 0
__func__ = "config_all_parsers_check"
#5 0x00022ec8 in config_parse_finish (ctx=0xffbffac8, error_r=0xffbffb98) at config-parser.c:747
new_filter = 0x657a8
error = 0x33c22 "/user=%s"
ret = 0
#6 0x00024230 in config_parse_file (path=0x50468 "/local/dovecot/etc/dovecot/dovecot.conf",
expand_values=false, modules=0x0, error_r=0xffbffb98) at config-parser.c:1064
root = {prev = 0x0, input = 0x0, path = 0x50468 "/local/dovecot/etc/dovecot/dovecot.conf",
linenum = 400}
ctx = {pool = 0x52b58, path = 0x50468 "/local/dovecot/etc/dovecot/dovecot.conf",
, all_parsers = {arr = {buffer = 0x58160, element_size = 4}, v = 0x58160,
v_modifiable = 0x58160}, root_parsers = 0x52b70, cur_section = 0x58388,
cur_input = 0x0, str = 0x58458, pathlen = 0, section_counter = 6, error = 0x0,
old = 0x58580, seen_settings = {_table = 0x0, _key = 0x0, _keyp = 0x0, _const_key = 0x0,
_value = 0x0, _valuep = 0x0}, filter = 0x0, expand_values = false, hide_errors = false}
i = 33
count = 33
key = 0x0
value = 0x0
full_line = 0x0
type = CONFIG_LINE_TYPE_SKIP
line = 0x0
fd = -1
ret = 0
handled = false
#7 0x000188dc in main (argc=1, argv=0xffbffc94) at doveconf.c:979
master_service_flags = (MASTER_SERVICE_FLAG_STANDALONE | MASTER_SERVICE_FLAG_NO_INIT_DATASTACK_FRAME | MASTER_SERVICE_FLAG_DONT_SEND_STATS)
scope = CONFIG_DUMP_SCOPE_ALL
orig_config_path = 0x46300 "/local/dovecot/etc/dovecot/dovecot.conf"
config_path = 0x50468 "/local/dovecot/etc/dovecot/dovecot.conf"
module = 0x1c00 <error: Cannot access memory at address 0x1c00>
module_names = {arr = {buffer = 0x46338, element_size = 4}, v = 0x46338,
v_modifiable = 0x46338}
filter = {service = 0x0, local_name = 0x0, local_host = 0x0, remote_host = 0x0,
local_net = {family = 0, u = {ip6 = {_S6_un = {_S6_u8 = '\000' <repeats 15 times>,
_S6_u32 = {0, 0, 0, 0}, __S6_align = 0}}, ip4 = {S_un = {S_un_b = {
s_b1 = 0 '\000', s_b2 = 0 '\000', s_b3 = 0 '\000', s_b4 = 0 '\000'}, S_un_w = {
s_w1 = 0, s_w2 = 0}, S_addr = 0}}}}, remote_net = {family = 0, u = {ip6 = {
_S6_un = {_S6_u8 = '\000' <repeats 15 times>, _S6_u32 = {0, 0, 0, 0},
__S6_align = 0}}, ip4 = {S_un = {S_un_b = {s_b1 = 0 '\000', s_b2 = 0 '\000',
s_b3 = 0 '\000', s_b4 = 0 '\000'}, S_un_w = {s_w1 = 0, s_w2 = 0},
S_addr = 0}}}}, local_bits = 0, remote_bits = 0}
wanted_modules = 0x0
error = 0xfef47940 <_uberdata> ""
exec_args = 0x0
setting_name_filters = 0x0
i = 5
c = -1
ret = -4195172
ret2 = 4
config_path_specified = false
expand_vars = false
hide_key = false
parse_full_config = false
simple_output = false
dump_defaults = false
host_verify = false
print_plugin_banner = true
hide_passwords = trueJoseph Tam <jtam.home@gmail.com>