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I'm testing kamailio v 5.6.1 in an alpine linux docker with musl libc (x86_64) Version 1.2.3 and I see a kamailio crash just with version option (kamailio --version).
The crash occur if I haven't localhost resolution in /etc/hosts. This isn't a canonical situation, but crash occur!
Running kamailio with gdb I see that the problem is in freeaddrinfo call in log_init function.
cat /etc/hosts
#127.0.0.1 localhost
#::1 localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
#172.30.0.3 bd9375eeb5af
#2001:db8:1111:2222:0:242:ac1e:3 bd9375eeb5af
/ #
/ # kamailio --version
Segmentation fault (core dumped)
# gdb --args kamailio --version
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Reading symbols from kamailio...
(gdb) run
Starting program: /usr/local/sbin/kamailio --version
Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7f9f5ed in freeaddrinfo () from /lib/ld-musl-x86_64.so.1
(gdb) bt
#0 0x00007ffff7f9f5ed in freeaddrinfo () from /lib/ld-musl-x86_64.so.1
#1 0x000055555559087d in calc_proc_no () at main.c:1976
#2 0x00007fffffffe8d0 in ?? ()
#3 0x00007fffffffed58 in ?? ()
#4 0x000055555561b143 in log_init () at core/dprint.c:483
Backtrace stopped: previous frame inner to this frame (corrupt stack?)
I suppose that log_init function needs a check for info pointer. If info pointer is not NULL, then call freeaddrinfo. I see similar protections in other points of code.
void log_init(void)
{
struct addrinfo hints;
struct addrinfo *info = NULL;
int gai_result;
char hostname[1024];
hostname[1023] = '\0';
gethostname (hostname, 1023);
memset (&hints, 0, sizeof (hints));
hints.ai_family = AF_UNSPEC; /*either IPV4 or IPV6 */
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_CANONNAME;
if ((gai_result = getaddrinfo (hostname, 0, &hints, &info)) != 0) {
log_fqdn = "?";
} else if (info == NULL) {
log_fqdn = "?";
} else {
log_fqdn = strdup (info->ai_canonname);
}
if(info) // add pointer validity
freeaddrinfo (info);
dprint_init_colors();
}
kamailio -vversion: kamailio 5.6.2 (x86_64/linux) 54a9c1
flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLOCKLIST, HAVE_RESOLV_RES, TLS_PTHREAD_MUTEX_SHARED
ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: 54a9c1
compiled on 09:26:43 Nov 15 2022 with gcc 9.3.0
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