[ldns-users] problem reading broken zonefile, possibly a memory bug

Fri Aug 9 09:36:30 UTC 2013

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Hi Erik,

On 08/08/2013 10:04 AM, Erik P. Ostlyngen wrote:
> Hi,
> 
> When I try to read a broken zonefile with ldns, the function 
> ldns_zone_new_frm_fp_l aborts in a way that might indicate some
> buggy memory handling. I'm using ldns-1.6.16 on a Linux 3.2.0, 64
> bit x86 SMP (Ubuntu 12.04). The library was configured and built
> with default settings.

Fixed this in git in parse.c, the end-of-buffer check was wrong.

Best regards,
   Wouter

> My broken zonefile looks like this: $TTL 4500 $ORIGIN broken.org.
> 
> myzone.org. 1000 IN SOA ( ldns.myzone.org. ns.ldns.myzone.org. 
> 2012113030 12345 1827 2345678 87654
> 
> hei hei hei hei (... last line repeated 4000 times)
> 
> Note that a ')' is missing at the end of the SOA record. Output
> from the example program ldns-read-zone:
> 
> ldns_download/ldns-1.6.16/examples$ ./ldns-read-zone broken.org ***
> glibc detected *** 
> /home/erik/ldns_download/ldns-1.6.16/examples/.libs/lt-ldns-read-zone:
>
> 
double free or corruption (!prev): 0x000000000238a290 ***
> ======= Backtrace: ========= 
> /lib/x86_64-linux-gnu/libc.so.6(+0x7eb96)[0x7f60d4c09b96] 
> /home/erik/ldns_download/ldns-1.6.16/.libs/libldns.so.1(ldns_rr_new_frm_fp_l+0x160)[0x7f60d4f83d20]
>
> 
/home/erik/ldns_download/ldns-1.6.16/.libs/libldns.so.1(ldns_zone_new_frm_fp_l+0xb8)[0x7f60d4f8c638]
> /home/erik/ldns_download/ldns-1.6.16/examples/.libs/lt-ldns-read-zone[0x40145a]
>
> 
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xed)[0x7f60d4bac76d]
> /home/erik/ldns_download/ldns-1.6.16/examples/.libs/lt-ldns-read-zone[0x401781]
>
> 
======= Memory map: ========
> 00400000-00403000 r-xp 00000000 fc:00 675055 
> /home/erik/ldns_download/ldns-1.6.16/examples/.libs/lt-ldns-read-zone
>
> 
00602000-00603000 r--p 00002000 fc:00 675055
> /home/erik/ldns_download/ldns-1.6.16/examples/.libs/lt-ldns-read-zone
>
> 
00603000-00604000 rw-p 00003000 fc:00 675055
> /home/erik/ldns_download/ldns-1.6.16/examples/.libs/lt-ldns-read-zone
>
> 
0238a000-023ab000 rw-p 00000000 00:00 0
> [heap] 7f60d4192000-7f60d41a7000 r-xp 00000000 fc:00 390968 
> /lib/x86_64-linux-gnu/libgcc_s.so.1 7f60d41a7000-7f60d43a6000 ---p
> 00015000 fc:00 390968 /lib/x86_64-linux-gnu/libgcc_s.so.1 
> 7f60d43a6000-7f60d43a7000 r--p 00014000 fc:00 390968 
> /lib/x86_64-linux-gnu/libgcc_s.so.1 7f60d43a7000-7f60d43a8000 rw-p
> 00015000 fc:00 390968 /lib/x86_64-linux-gnu/libgcc_s.so.1 
> 7f60d43a8000-7f60d43be000 r-xp 00000000 fc:00 391143 
> /lib/x86_64-linux-gnu/libz.so.1.2.3.4 7f60d43be000-7f60d45bd000
> ---p 00016000 fc:00 391143 /lib/x86_64-linux-gnu/libz.so.1.2.3.4 
> 7f60d45bd000-7f60d45be000 r--p 00015000 fc:00 391143 
> /lib/x86_64-linux-gnu/libz.so.1.2.3.4 7f60d45be000-7f60d45bf000
> rw-p 00016000 fc:00 391143 /lib/x86_64-linux-gnu/libz.so.1.2.3.4 
> 7f60d45bf000-7f60d45c1000 r-xp 00000000 fc:00 391094 
> /lib/x86_64-linux-gnu/libdl-2.15.so 7f60d45c1000-7f60d47c1000 ---p
> 00002000 fc:00 391094 /lib/x86_64-linux-gnu/libdl-2.15.so 
> 7f60d47c1000-7f60d47c2000 r--p 00002000 fc:00 391094 
> /lib/x86_64-linux-gnu/libdl-2.15.so 7f60d47c2000-7f60d47c3000 rw-p
> 00003000 fc:00 391094 /lib/x86_64-linux-gnu/libdl-2.15.so 
> 7f60d47c3000-7f60d4962000 r-xp 00000000 fc:00 408958 
> /lib/x86_64-linux-gnu/libcrypto.so.1.0.0 7f60d4962000-7f60d4b61000
> ---p 0019f000 fc:00 408958 
> /lib/x86_64-linux-gnu/libcrypto.so.1.0.0 7f60d4b61000-7f60d4b7c000
> r--p 0019e000 fc:00 408958 
> /lib/x86_64-linux-gnu/libcrypto.so.1.0.0 7f60d4b7c000-7f60d4b87000
> rw-p 001b9000 fc:00 408958 
> /lib/x86_64-linux-gnu/libcrypto.so.1.0.0 7f60d4b87000-7f60d4b8b000
> rw-p 00000000 00:00 0 7f60d4b8b000-7f60d4d40000 r-xp 00000000 fc:00
> 391095 /lib/x86_64-linux-gnu/libc-2.15.so 7f60d4d40000-7f60d4f3f000
> ---p 001b5000 fc:00 391095 /lib/x86_64-linux-gnu/libc-2.15.so 
> 7f60d4f3f000-7f60d4f43000 r--p 001b4000 fc:00 391095 
> /lib/x86_64-linux-gnu/libc-2.15.so 7f60d4f43000-7f60d4f45000 rw-p
> 001b8000 fc:00 391095 /lib/x86_64-linux-gnu/libc-2.15.so 
> 7f60d4f45000-7f60d4f4a000 rw-p 00000000 00:00 0 
> 7f60d4f4a000-7f60d4f9c000 r-xp 00000000 fc:00 528909 
> /home/erik/ldns_download/ldns-1.6.16/.libs/libldns.so.1.6.16 
> 7f60d4f9c000-7f60d519b000 ---p 00052000 fc:00 528909 
> /home/erik/ldns_download/ldns-1.6.16/.libs/libldns.so.1.6.16 
> 7f60d519b000-7f60d519c000 r--p 00051000 fc:00 528909 
> /home/erik/ldns_download/ldns-1.6.16/.libs/libldns.so.1.6.16 
> 7f60d519c000-7f60d51a2000 rw-p 00052000 fc:00 528909 
> /home/erik/ldns_download/ldns-1.6.16/.libs/libldns.so.1.6.16 
> 7f60d51a2000-7f60d51c4000 r-xp 00000000 fc:00 391112 
> /lib/x86_64-linux-gnu/ld-2.15.so 7f60d53b7000-7f60d53bb000 rw-p
> 00000000 00:00 0 7f60d53c0000-7f60d53c4000 rw-p 00000000 00:00 0 
> 7f60d53c4000-7f60d53c5000 r--p 00022000 fc:00 391112 
> /lib/x86_64-linux-gnu/ld-2.15.so 7f60d53c5000-7f60d53c7000 rw-p
> 00023000 fc:00 391112 /lib/x86_64-linux-gnu/ld-2.15.so 
> 7fff6e0ce000-7fff6e0ef000 rw-p 00000000 00:00 0 [stack] 
> 7fff6e0ef000-7fff6e0f0000 r-xp 00000000 00:00 0 [vdso] 
> ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0 [vsyscall] 
> Aborted
> 
> 
> Regards, Erik ￘stlyngen UNINETT Norid 
> _______________________________________________ ldns-users mailing
> list ldns-users at open.nlnetlabs.nl 
> http://open.nlnetlabs.nl/mailman/listinfo/ldns-users
> 

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