Brandon,

it would be a great help if you could reproduce this with a backtrace
in gdb. This will make it much easier to find the problem. Thanks

gdb cfagent
run -qIvK

(overflow)

back



Brandon Hutchinson wrote:
> On RHEL 5 systems (i386), placing FriendStatus(0) in "alerts" causes a
> buffer overflow error on cfengine versions 2.2.0 and 2.2.1.
> 
> I do not receive this buffer overflow error with cfengine 2.1.22 on RHEL
> 5, nor do I receive it with any version on RHEL 4.
> 
> # cfagent -qvIK:
> ...
> 
> CheckFriendConnections(0)
> *** buffer overflow detected ***: cfagent terminated
> ======= Backtrace: =========
> /lib/libc.so.6(__chk_fail+0x41)[0x7ce241]
> /lib/libc.so.6[0x7cdc83]
> /lib/libc.so.6(__snprintf_chk+0x37)[0x7cdb67]
> cfagent[0x8062289]
> cfagent[0x80770ec]
> cfagent[0x807b578]
> cfagent[0x805a5cf]
> cfagent[0x804f057]
> /lib/libc.so.6(__libc_start_main+0xdc)[0x702dec]
> cfagent[0x804acb1]
> ======= Memory map: ========
> 002c5000-002c9000 r-xp 00000000 68:02 557095     /lib/libnss_dns-2.5.so
> 002c9000-002ca000 r-xp 00003000 68:02 557095     /lib/libnss_dns-2.5.so
> 002ca000-002cb000 rwxp 00004000 68:02 557095     /lib/libnss_dns-2.5.so
> 005da000-005db000 r-xp 005da000 00:00 0          [vdso]
> 006d0000-006e9000 r-xp 00000000 68:02 559290     /lib/ld-2.5.so
> 006e9000-006ea000 r-xp 00018000 68:02 559290     /lib/ld-2.5.so
> 006ea000-006eb000 rwxp 00019000 68:02 559290     /lib/ld-2.5.so
> 006ed000-00824000 r-xp 00000000 68:02 559291     /lib/libc-2.5.so
> 00824000-00826000 r-xp 00137000 68:02 559291     /lib/libc-2.5.so
> 00826000-00827000 rwxp 00139000 68:02 559291     /lib/libc-2.5.so
> 00827000-0082a000 rwxp 00827000 00:00 0 
> 0082c000-0082e000 r-xp 00000000 68:02 559294     /lib/libdl-2.5.so
> 0082e000-0082f000 r-xp 00001000 68:02 559294     /lib/libdl-2.5.so
> 0082f000-00830000 rwxp 00002000 68:02 559294     /lib/libdl-2.5.so
> 00832000-00857000 r-xp 00000000 68:02 559293     /lib/libm-2.5.so
> 00857000-00858000 r-xp 00024000 68:02 559293     /lib/libm-2.5.so
> 00858000-00859000 rwxp 00025000 68:02 559293     /lib/libm-2.5.so
> 0085b000-0086e000 r-xp 00000000 68:02 559300     /lib/libpthread-2.5.so
> 0086e000-0086f000 r-xp 00012000 68:02 559300     /lib/libpthread-2.5.so
> 0086f000-00870000 rwxp 00013000 68:02 559300     /lib/libpthread-2.5.so
> 00870000-00872000 rwxp 00870000 00:00 0 
> 00874000-00886000 r-xp 00000000 68:02 559283     /lib/libnsl-2.5.so
> 00886000-00887000 r-xp 00012000 68:02 559283     /lib/libnsl-2.5.so
> 00887000-00888000 rwxp 00013000 68:02 559283     /lib/libnsl-2.5.so
> 00888000-0088a000 rwxp 00888000 00:00 0 
> 0088c000-00895000 r-xp 00000000 68:02
> 559319     /lib/libnss_files-2.5.so
> 00895000-00896000 r-xp 00008000 68:02
> 559319     /lib/libnss_files-2.5.so
> 00896000-00897000 rwxp 00009000 68:02
> 559319     /lib/libnss_files-2.5.so
> 00899000-008a1000 r-xp 00000000 68:02 559320     /lib/libnss_nis-2.5.so
> 008a1000-008a2000 r-xp 00007000 68:02 559320     /lib/libnss_nis-2.5.so
> 008a2000-008a3000 rwxp 00008000 68:02 559320     /lib/libnss_nis-2.5.so
> 008d5000-008e7000 r-xp 00000000 68:02 759336     /usr/lib/libz.so.1.2.3
> 008e7000-008e8000 rwxp 00011000 68:02 759336     /usr/lib/libz.so.1.2.3
> 008ea000-009de000 r-xp 00000000 68:02 559314     /lib/libdb-4.3.so
> 009de000-009e1000 rwxp 000f4000 68:02 559314     /lib/libdb-4.3.so
> 009f0000-009ff000 r-xp 00000000 68:02 559311     /lib/libresolv-2.5.so
> 009ff000-00a00000 r-xp 0000e000 68:02 559311     /lib/libresolv-2.5.so
> 00a00000-00a01000 rwxp 0000f000 68:02 559311     /lib/libresolv-2.5.so
> 00a01000-00a03000 rwxp 00a01000 00:00 0 
> 00a10000-00b2c000 r-xp 00000000 68:02
> 559309     /lib/libcrypto.so.0.9.8b
> 00b2c000-00b3e000 rwxp 0011c000 68:02
> 559309     /lib/libcrypto.so.0.9.8b
> 00b3e000-00b42000 rwxp 00b3e000 00:00 0 
> 00b62000-00b6d000 r-xp 00000000 68:02
> 557074     /lib/libgcc_s-4.1.1-20070105.so
> .1
> 00b6d000-00b6e000 rwxp 0000a000 68:02
> 557074     /lib/libgcc_s-4.1.1-20070105.so
> .1
> 08048000-080ed000 r-xp 00000000 68:02 767492     /usr/sbin/cfagent
> 080ed000-080ef000 rw-p 000a5000 68:02 767492     /usr/sbin/cfagent
> 080ef000-0815b000 rw-p 080ef000 00:00 0 
> 08632000-086c0000 rw-p 08632000 00:00 0 
> b7f20000-b7f23000 rw-p b7f20000 00:00 0 
> b7f28000-b7f2a000 rw-p b7f28000 00:00 0 
> bfd44000-bfd6a000 rw-p bfd44000 00:00 0          [stack]
> Aborted
> 
> Please let me know if you would like me to gather additional information
> from the RHEL 5 systems to help troubleshoot the problem.
> 
> Best regards,
> 
> Brandon Hutchinson
> _______________________________________________
> Bug-cfengine mailing list
> [email protected]
> https://cfengine.org/mailman/listinfo/bug-cfengine

-- 
Mark Burgess

Professor of Network and System Administration
Oslo University College

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