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2021-11-26libc/inet/resolv: fix per thread res_state accessPeter Seiderer
- use the provided __res_state() method instead of direct access to struct __res_state pointer &_res/*__resp - change the __UCLIBC_HAS_TLS__ protected __res_state() implementation to the one where the comment 'When threaded, _res may be a per-thread variable.' indicates this should be used with threads/TLS enabled Fixes the following segfaults with buildroot raspberrypi3_64_defconfig (uclibc, -Os, Note: runs fine using the raspberrypi3_defconfig): $ /usr/sbin/ntpd -n -d 1970-01-01T00:01:49 ntpd[249]: INIT: ntpd ntpsec-1.2.0 2021-11-03T20:39:50Z: Starting 1970-01-01T00:01:49 ntpd[249]: INIT: Command line: /usr/sbin/ntpd -n -d 1970-01-01T00:01:49 ntpd[249]: INIT: precision = 7.240 usec (-17) 1970-01-01T00:01:49 ntpd[249]: INIT: successfully locked into RAM 1970-01-01T00:01:49 ntpd[249]: CONFIG: readconfig: parsing file: /etc/ntp.conf 1970-01-01T00:01:49 ntpd[249]: CONFIG: restrict nopeer ignored 1970-01-01T00:01:49 ntpd[249]: INIT: Using SO_TIMESTAMPNS 1970-01-01T00:01:49 ntpd[249]: IO: Listen and drop on 0 v6wildcard [::]:123 1970-01-01T00:01:49 ntpd[249]: IO: Listen and drop on 1 v4wildcard 0.0.0.0:123 1970-01-01T00:01:49 ntpd[249]: IO: Listen normally on 2 lo 127.0.0.1:123 1970-01-01T00:01:49 ntpd[249]: IO: Listen normally on 3 eth0 172.16.0.30:123 1970-01-01T00:01:49 ntpd[249]: IO: Listen normally on 4 lo [::1]:123 1970-01-01T00:01:49 ntpd[249]: IO: Listen normally on 5 eth0 [fe80::ba27:ebff:fea6:340%2]:123 1970-01-01T00:01:49 ntpd[249]: IO: Listening on routing socket on fd #22 for interface updates 1970-01-01T00:01:50 ntpd[249]: SYNC: Found 10 servers, suggest minsane at least 3 1970-01-01T00:01:50 ntpd[249]: INIT: MRU 10922 entries, 13 hash bits, 65536 bytes 1970-01-01T00:01:50 ntpd[249]: statistics directory /var/NTP/ does not exist or is unwriteable, error No such file or directory 1970-01-01T00:01:51 ntpd[249]: DNS: dns_probe: 0.pool.ntp.org, cast_flags:8, flags:101 Segmentation fault (core dumped) $ ./host/bin/aarch64-buildroot-linux-uclibc-gdb ./build/ntpsec-1_2_0/build/main/ntpd/ntpd core Core was generated by `/usr/sbin/ntpd -n -d'. Program terminated with signal SIGSEGV, Segmentation fault. (gdb) where #0 0x0000007f8ff1f150 in res_sync_func () at libc/inet/resolv.c:3356 #1 0x0000007f8ff1c468 in __open_nameservers () at libc/inet/resolv.c:949 #2 0x0000007f8ff1b498 in __dns_lookup (name=0x55943c67f0 "0.pool.ntp.org", type=1, outpacket=0x7f8fe91c48, a=0x7f8fe91c08) at libc/inet/resolv.c:1134 #3 0x0000007f8ff1d744 in __GI_gethostbyname_r ( name=0x55943c67f0 "0.pool.ntp.org", result_buf=0x7f8fe92628, buf=0x7f8fe91d90 "", buflen=992, result=0x7f8fe92670, h_errnop=0x7f8fe92668) at libc/inet/resolv.c:1966 #4 0x0000007f8ff1d9a0 in __GI_gethostbyname2_r ( name=0x55943c67f0 "0.pool.ntp.org", family=2, result_buf=0x7f8fe92628, buf=0x7f8fe91d70 "0.pool.ntp.org", buflen=1024, result=0x7f8fe92670, h_errnop=0x7f8fe92668) at libc/inet/resolv.c:2065 #5 0x0000007f8ff16924 in gaih_inet (name=0x55943c67f0 "0.pool.ntp.org", service=0x7f8fe92828, req=0x7f8fe92890, pai=0x7f8fe92838) at libc/inet/getaddrinfo.c:596 #6 0x0000007f8ff17624 in __GI_getaddrinfo ( name=0x55943c67f0 "0.pool.ntp.org", service=0x5582eb8acd "\377H\213D$\bL\211\367H\213\260\270", hints=0x7f8fe92890, pai=0x5582ee1bf8) at libc/inet/getaddrinfo.c:957 #7 0x0000005582ea60f4 in _start () (gdb) p _res $1 = {options = 0, nsaddr_list = {{sin_family = 0, sin_port = 0, sin_addr = { s_addr = 0}, sin_zero = "\000\000\000\000\000\000\000"}, { sin_family = 0, sin_port = 0, sin_addr = {s_addr = 0}, sin_zero = "\000\000\000\000\000\000\000"}, {sin_family = 0, sin_port = 0, sin_addr = {s_addr = 0}, sin_zero = "\000\000\000\000\000\000\000"}}, dnsrch = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, nscount = 0 '\000', ndots = 0 '\000', retrans = 0 '\000', retry = 0 '\000', defdname = '\000' <repeats 255 times>, nsort = 0 '\000', pfcode = 0, id = 0, res_h_errno = 0, sort_list = {{addr = { s_addr = 0}, mask = 0}, {addr = {s_addr = 0}, mask = 0}, {addr = { s_addr = 0}, mask = 0}, {addr = {s_addr = 0}, mask = 0}, {addr = { s_addr = 0}, mask = 0}, {addr = {s_addr = 0}, mask = 0}, {addr = { s_addr = 0}, mask = 0}, {addr = {s_addr = 0}, mask = 0}, {addr = { s_addr = 0}, mask = 0}, {addr = {s_addr = 0}, mask = 0}}, _u = { _ext = {nsaddrs = {0x0, 0x0, 0x0}, nscount = 0 '\000', nstimes = {0, 0, 0}, nssocks = {0, 0, 0}, nscount6 = 0, nsinit = 0}}} (gdb) p &_res $2 = (struct __res_state *) 0x7f8ff8fd98 <_res> (gdb) p rp $3 = (struct __res_state *) 0x7fffffffff And the following uclibc code at libc/inet/resolv.c:3356: 3345 static void res_sync_func(void) 3346 { 3347 struct __res_state *rp = &(_res); 3348 int n; 3349 3350 /* If we didn't get malloc failure earlier... */ 3351 if (__nameserver != (void*) &__local_nameserver) { 3352 /* TODO: 3353 * if (__nameservers < rp->nscount) - try to grow __nameserver[]? 3354 */ 3355 #ifdef __UCLIBC_HAS_IPV6__ 3356 if (__nameservers > rp->_u._ext.nscount) 3357 __nameservers = rp->_u._ext.nscount; 3358 n = __nameservers; The special thing about ntpsec is the DNS lookup in an extra thread and/or the call to res_init(), see ntpsec-1_2_0/ntpd/ntp_dns.c: 69 msyslog(LOG_INFO, "DNS: dns_probe: %s, cast_flags:%x, flags:%x%s", 70 hostname, pp->cast_flags, pp->cfg.flags, busy); 71 if (NULL != active) /* normally redundant */ 72 return false; 73 74 active = pp; 75 76 sigfillset(&block_mask); 77 pthread_sigmask(SIG_BLOCK, &block_mask, &saved_sig_mask); 78 rc = pthread_create(&worker, NULL, dns_lookup, pp); and 165 static void* dns_lookup(void* arg) 166 { 167 struct peer *pp = (struct peer *) arg; 168 struct addrinfo hints; 169 170 #ifdef HAVE_SECCOMP_H 171 setup_SIGSYS_trap(); /* enable trap for this thread */ 172 #endif 173 174 #ifdef HAVE_RES_INIT 175 /* Reload DNS servers from /etc/resolv.conf in case DHCP has updated it. 176 * We only need to do this occasionally, but it's not expensive 177 * and simpler to do it every time than it is to figure out when 178 * to do it. 179 * This res_init() covers NTS too. 180 */ 181 res_init(); 182 #endif 183 184 if (pp->cfg.flags & FLAG_NTS) { 185 #ifndef DISABLE_NTS 186 nts_probe(pp); 187 #endif 188 } else { 189 ZERO(hints); 190 hints.ai_protocol = IPPROTO_UDP; 191 hints.ai_socktype = SOCK_DGRAM; 192 hints.ai_family = AF(&pp->srcadr); 193 gai_rc = getaddrinfo(pp->hostname, NTP_PORTA, &hints, &answer); 194 } $ /usr/lib/uclibc-ng-test/test/inet/tst-res Segmentation fault (core dumped) $ ./host/bin/aarch64-buildroot-linux-uclibc-gdb ./build/uclibc-ng-test-0844445e7358eb10e716155b55b0fb23e88d644a/test/inet/tst-res core Core was generated by `/usr/lib/uclibc-ng-test/test/inet/tst-res'. Program terminated with signal SIGSEGV, Segmentation fault. (gdb) where #0 __GI___res_init () at libc/inet/resolv.c:3514 #1 0x0000005591e507e4 in main (argc=<optimized out>, argv=<optimized out>) at tst-res.c:20 First reported here: https://lore.kernel.org/buildroot/20211028230131.5f50d6e7@gmx.net/ https://www.mail-archive.com/devel@uclibc-ng.org/msg01085.html Signed-off-by: Peter Seiderer <ps.report@gmx.net>
2020-09-21Support b64_ntop(), b64_pton() (bsd-compat)Waldemar Brodkorb
Signed-off-by: akater <nuclearspace@gmail.com>
2011-11-17resolv: hide relocationsBernhard Reutner-Fischer
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2011-08-26include/resolv.h: provide __res_state._u even if !__UCLIBC_HAS_IPV6__Daniel Mack
This struct is used for IPv4 as well, so only make the members conditional that are purely used by IPv6. Signed-off-by: Daniel Mack <zonque@gmail.com>
2011-08-26inet/resolv: add res_ninit and res_ncloseDaniel Mack
Some reordering of existing functions was necessary in order to provide this functionality. Signed-off-by: Daniel Mack <zonque@gmail.com>
2011-08-26inet/resolv: add res_mkqueryDaniel Mack
Signed-off-by: Daniel Mack <zonque@gmail.com>
2011-08-26inet/resolv: add dn_skipname and ns_name_skipDaniel Mack
One uses the other, so add them in one go. Signed-off-by: Daniel Mack <zonque@gmail.com>
2011-08-26inet/resolv: Add dn_compDaniel Mack
Signed-off-by: Daniel Mack <zonque@gmail.com>
2011-03-08resolv.h: disable unneeded prototypesPeter S. Mazinger
Signed-off-by: Peter S. Mazinger <ps.m@gmx.net>
2010-05-16resolv.h: fix wring indentation of #ifdef/#endif pairsDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2010-02-03/etc/resolv.conf: support "timeout:n" and "attempts:n" optionsDenys Vlasenko
text data bss dec hex filename - 1745 2 4 1751 6d7 libc/inet/dnslookup.o + 1760 2 4 1766 6e6 libc/inet/dnslookup.o - 962 0 4 966 3c6 libc/inet/opennameservers.o + 1099 0 4 1103 44f libc/inet/opennameservers.o - 462 4 472 938 3aa libc/inet/res_init.o + 454 4 468 926 39e libc/inet/res_init.o - 870 0 0 870 366 libc/inet/res_query.o + 867 0 0 867 363 libc/inet/res_query.o Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2009-09-26include/: add tls errno and res_stateAustin Foxley
Signed-off-by: Austin Foxley <austinf@cetoncorp.com>
2008-12-29- whitespace cleanup; no obj-code changesBernhard Reutner-Fischer
2008-11-20Last portion of libc_hidden_proto removal.Denis Vlasenko
Appears to build fine (several .configs tried)
2008-11-17resolver: use timeout of 5 (glibc uses that).Denis Vlasenko
delete some duplication in constants.
2008-11-17resolver: separate gethostent and gethostent_r into two .o files;Denis Vlasenko
delete two stray files which compile to nothing
2008-11-16resolver: improved support for overriding DNS server addressesDenis Vlasenko
in _res structure. Used by busybox's nslookup.
2008-11-14fixing resolver part 2: make _res structure membersDenis Vlasenko
configurable. we don't use most of it anyway.
2007-04-17- shrink resolver codeBernhard Reutner-Fischer
2006-02-25This never gets defined. I have a patch pending in glibc too."Steven J. Hill"
2005-12-09Remove patch chunk and remove unusedPeter S. Mazinger
2005-12-09Sync w/ glibc, should be equiv. to the earlierPeter S. Mazinger
2002-08-19Fixup struct _res handling so apps using struct _res can actuallyEric Andersen
compile ("worst standard ever!") -Erik
2002-08-16Remove thread-specific stuff entirely.Miles Bader
2002-08-16(_res): Define as a macro if __UCLIBC_HAS_THREADS__ is defined,Miles Bader
regardless of _LIBC.
2002-08-16Replace all instances of _LIBC_REENTRANT with __UCLIBC_HAS_THREADS__Eric Andersen
-Erik
2002-01-17The resolver is still using the old API so we cannot use the new resolverDavid McCullough
version numbers or apps get confused.
2001-09-27Rev all the header files to sync things with glibc 2.2.4Eric Andersen
2001-07-11Added __BEGIN_DECLS and __END_DECLS to the files that didn't haveDavid McCullough
it and that I could see needed it. Should be pretty low impact as these are only defined when using C++.
2001-05-31Cleanup some stupid warningsEric Andersen
2001-02-26Added res_init and res_queryDavid McCullough
2001-02-03Fix up the set of include files pulled into resolv.hEric Andersen
2000-07-06Lots and lots of cleanups.Eric Andersen
-Erik
2000-05-14Initial revisionErik Andersen