*** buffer overflow detected *** when only-rewrites=0

[efbertos]

strace_pdns-logger.txt
[pdns-logger@powerdns root]$ pdns_recursor --version
Aug 19 11:03:44 PowerDNS Recursor 4.2.0 (C) 2001-2019 PowerDNS.COM BV

[root@powerdns system]# uname -a
Linux powerdns 3.10.0-957.27.2.el7.x86_64 #1 SMP Mon Jul 29 17:46:05 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

[root@powerdns system]# cat /etc/*release
CentOS Linux release 7.6.1810 (Core)

[root@powerdns system]# /usr/sbin/pdns-logger -f
syslog: Disabled according to configuration
logsqlite: Disabled according to configuration
Connection from host 127.0.0.1, port 55818.
Connection from host 127.0.0.1, port 55820.
Connection from host 127.0.0.1, port 55822.
Connection from host 127.0.0.1, port 55824.
*** buffer overflow detected ***: /usr/sbin/pdns-logger terminated
======= Backtrace: =========
/lib64/libc.so.6(__fortify_fail+0x37)[0x7f6a4cdaeb67]
/lib64/libc.so.6(+0x115ce2)[0x7f6a4cdacce2]
/lib64/libc.so.6(__strncat_chk+0x13c)[0x7f6a4cdabf4c]
/usr/sbin/pdns-logger[0x40422c]
/usr/sbin/pdns-logger(pdns_loggers_log+0x28)[0x405268]
/usr/sbin/pdns-logger[0x40485d]
/lib64/libpthread.so.0(+0x7dd5)[0x7f6a4d320dd5]
/lib64/libc.so.6(clone+0x6d)[0x7f6a4cd9502d]
======= Memory map: ========
00400000-00408000 r-xp 00000000 fd:00 712680 /usr/sbin/pdns-logger
00608000-0060a000 r--p 00008000 fd:00 712680 /usr/sbin/pdns-logger
0060a000-0060b000 rw-p 0000a000 fd:00 712680 /usr/sbin/pdns-logger
024c3000-024e4000 rw-p 00000000 00:00 0 [heap]
7f6a3c000000-7f6a3c021000 rw-p 00000000 00:00 0
7f6a3c021000-7f6a40000000 ---p 00000000 00:00 0
7f6a44000000-7f6a44021000 rw-p 00000000 00:00 0
7f6a44021000-7f6a48000000 ---p 00000000 00:00 0
7f6a4a879000-7f6a4a88e000 r-xp 00000000 fd:00 75 /usr/lib64/libgcc_s-4.8.5-20150702.so.1
7f6a4a88e000-7f6a4aa8d000 ---p 00015000 fd:00 75 /usr/lib64/libgcc_s-4.8.5-20150702.so.1
7f6a4aa8d000-7f6a4aa8e000 r--p 00014000 fd:00 75 /usr/lib64/libgcc_s-4.8.5-20150702.so.1
7f6a4aa8e000-7f6a4aa8f000 rw-p 00015000 fd:00 75 /usr/lib64/libgcc_s-4.8.5-20150702.so.1
7f6a4aa8f000-7f6a4aa90000 ---p 00000000 00:00 0
7f6a4aa90000-7f6a4b290000 rw-p 00000000 00:00 0
7f6a4b290000-7f6a4b291000 ---p 00000000 00:00 0
7f6a4b291000-7f6a4ba91000 rw-p 00000000 00:00 0
7f6a4ba91000-7f6a4ba92000 ---p 00000000 00:00 0
7f6a4ba92000-7f6a4c292000 rw-p 00000000 00:00 0
7f6a4c292000-7f6a4c293000 ---p 00000000 00:00 0
7f6a4c293000-7f6a4ca93000 rw-p 00000000 00:00 0
7f6a4ca93000-7f6a4ca95000 r-xp 00000000 fd:00 7545 /usr/lib64/libdl-2.17.so
7f6a4ca95000-7f6a4cc95000 ---p 00002000 fd:00 7545 /usr/lib64/libdl-2.17.so
7f6a4cc95000-7f6a4cc96000 r--p 00002000 fd:00 7545 /usr/lib64/libdl-2.17.so
7f6a4cc96000-7f6a4cc97000 rw-p 00003000 fd:00 7545 /usr/lib64/libdl-2.17.so
7f6a4cc97000-7f6a4ce59000 r-xp 00000000 fd:00 7249 /usr/lib64/libc-2.17.so
7f6a4ce59000-7f6a4d059000 ---p 001c2000 fd:00 7249 /usr/lib64/libc-2.17.so
7f6a4d059000-7f6a4d05d000 r--p 001c2000 fd:00 7249 /usr/lib64/libc-2.17.so
7f6a4d05d000-7f6a4d05f000 rw-p 001c6000 fd:00 7249 /usr/lib64/libc-2.17.so
7f6a4d05f000-7f6a4d064000 rw-p 00000000 00:00 0
7f6a4d064000-7f6a4d115000 r-xp 00000000 fd:00 31859 /usr/lib64/libsqlite3.so.0.8.6
7f6a4d115000-7f6a4d314000 ---p 000b1000 fd:00 31859 /usr/lib64/libsqlite3.so.0.8.6
7f6a4d314000-7f6a4d316000 r--p 000b0000 fd:00 31859 /usr/lib64/libsqlite3.so.0.8.6
7f6a4d316000-7f6a4d319000 rw-p 000b2000 fd:00 31859 /usr/lib64/libsqlite3.so.0.8.6
7f6a4d319000-7f6a4d330000 r-xp 00000000 fd:00 7572 /usr/lib64/libpthread-2.17.so
7f6a4d330000-7f6a4d52f000 ---p 00017000 fd:00 7572 /usr/lib64/libpthread-2.17.so
7f6a4d52f000-7f6a4d530000 r--p 00016000 fd:00 7572 /usr/lib64/libpthread-2.17.so
7f6a4d530000-7f6a4d531000 rw-p 00017000 fd:00 7572 /usr/lib64/libpthread-2.17.so
7f6a4d531000-7f6a4d535000 rw-p 00000000 00:00 0
7f6a4d535000-7f6a4d53d000 r-xp 00000000 fd:00 712698 /usr/lib64/libprotobuf-c.so.1.0.0
7f6a4d53d000-7f6a4d73c000 ---p 00008000 fd:00 712698 /usr/lib64/libprotobuf-c.so.1.0.0
7f6a4d73c000-7f6a4d73d000 r--p 00007000 fd:00 712698 /usr/lib64/libprotobuf-c.so.1.0.0
7f6a4d73d000-7f6a4d73e000 rw-p 00008000 fd:00 712698 /usr/lib64/libprotobuf-c.so.1.0.0
7f6a4d73e000-7f6a4d760000 r-xp 00000000 fd:00 350 /usr/lib64/ld-2.17.so
7f6a4d952000-7f6a4d956000 rw-p 00000000 00:00 0
7f6a4d95c000-7f6a4d95f000 rw-p 00000000 00:00 0
7f6a4d95f000-7f6a4d960000 r--p 00021000 fd:00 350 /usr/lib64/ld-2.17.so
7f6a4d960000-7f6a4d961000 rw-p 00022000 fd:00 350 /usr/lib64/ld-2.17.so
7f6a4d961000-7f6a4d962000 rw-p 00000000 00:00 0
7ffc44aa3000-7ffc44ac4000 rw-p 00000000 00:00 0 [stack]
7ffc44ad1000-7ffc44ad3000 r-xp 00000000 00:00 0 [vdso]
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0 [vsyscall]

[sid3windr]

Seeing the same issue here...

Thread 2 "pdns-logger" received signal SIGABRT, Aborted.
[Switching to Thread 0x7ffff7b23700 (LWP 22223)]
__GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
50 ../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) bt
#0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#1 0x00007ffff7cd2535 in __GI_abort () at abort.c:79
#2 0x00007ffff7d29508 in __libc_message (action=, fmt=fmt@entry=0x7ffff7e3407b "*** %s ***: %s terminated\n") at ../sysdeps/posix/libc_fatal.c:181
#3 0x00007ffff7dba80d in __GI___fortify_fail_abort (need_backtrace=need_backtrace@entry=true, msg=msg@entry=0x7ffff7e33ff8 "buffer overflow detected") at fortify_fail.c:28
#4 0x00007ffff7dba841 in __GI___fortify_fail (msg=msg@entry=0x7ffff7e33ff8 "buffer overflow detected") at fortify_fail.c:44
#5 0x00007ffff7db8940 in __GI___chk_fail () at chk_fail.c:28
#6 0x00007ffff7db7d93 in __strncat_chk (s1=, s2=, n=, s1len=) at strncat_chk.c:33
#7 0x0000000000404108 in logfile_log ()
#8 0x0000000000405328 in pdns_loggers_log ()
#9 0x000000000040492d in socket_thread_exec ()
#10 0x00007ffff7f9afa3 in start_thread (arg=) at pthread_create.c:486
#11 0x00007ffff7da94cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

(Probably not a too useful backtrace but posting anyway)

[sid3windr]

Blindly raising the string lengths from 1024 to 4096 in logfile_log() seems to keep it running here.