Xymon on Ubuntu 24.04 🔗 link

On 16/09/2024 10:45, Jeremy Laidman wrote:

The original bug report here looks to be the same as that posted in the following Ubuntu bug report:

https://bugs.launchpad.net/ubuntu/+source/xymon/+bug/2078638

so it would be helpful to add any extra observations/attempted trouble shooting steps to that bug report. Other affected Ubuntu users can also click the "does this bug affect you?" link if they have the same problem, as that helps to indicate there might be a problem with the package.

Adam

Hi Adam

I did tick the "does this bug affect you", so far only 4 people are listed on the this bug affect you list.

Best regards

ChrisP

-----Original Message-----
From: Adam Thorn via Xymon <xymon@xymon.com> 
Sent: Monday, 23 September 2024 10:17
To: xymon@xymon.com
Cc: Adam Thorn <user-f6b877930936@xymon.invalid>
Subject: [Xymon] Re: Xymon on Ubuntu 24.04

On 16/09/2024 10:45, Jeremy Laidman wrote:

The original bug report here looks to be the same as that posted in the following Ubuntu bug report:

https://bugs.launchpad.net/ubuntu/+source/xymon/+bug/2078638

so it would be helpful to add any extra observations/attempted trouble shooting steps to that bug report. Other affected Ubuntu users can also click the "does this bug affect you?" link if they have the same problem, as that helps to indicate there might be a problem with the package.

Adam

Hi Chris!

As the Debian developer who released 4.3.30-2, I'll try to help here,
but I'm not sure, whether I can help, since I didn't try this out on
Ubuntu yet but only on Debian 12.

# apt-cache policy xymon
xymon:
  Installed: 4.3.30-2build3

Okay, this should be 4.3.30-2 without changes but only re-build on
Ubuntu.

I hope that you have xymon-client installed, too?

Okay, just tried this myself on a freshly installed Debian 12 (with
4.3.30-2 backported to Debian 12).
I first had to install apache2 first, otherwise enabling mod rewrite
and xymon conf may have been done by hand.
Then I installed xymon and xymon-client and used 127.0.0.1 as "Xymon
server" via debconf (as well as the FQDN of the server as "Client
hostname") on installation of xymon-client.

Hmmm, I doesn't observe these on Debian, maybe Ubuntu uses some other
type of hardening, which breaks the package or there is some other
build problem?

Why do you do so?  The idea of the configuration is that you define
the Xymon server IP via debconf when installing xymon-client, which
sets
XYMONSERVERS="127.0.0.1"
(or a different IP) in /etc/default/xymon-client
This variable is used as the server IP automatically.

With this setup xymon comes up and I see the client tests and after
some cycles also some data in the graphs.  Works without problems for
me.

Maybe I really have to try this out with Ubuntu 24.04...

[...]

Okay, I now have a minimal Ubuntu 24.04 server installed, installed
apache2 and xymon (including xymon-client).  Again I used 127.0.0.1 as
the server IP (which is written to /etc/defaults/xymon-client).
And now I can reproduce your issue.  I see no local data fields (disk,
cpu,...) and I see "buffer overflow detected" messages in the logs.

Comparing "systemctl status xymon" I see, that 2*xymond_rrd,
xymond_client, xymond_alert are missing (AKA not running) on the
Ubuntu server, seems that this are the processes that had a buffer
overflow.

So I tried to re-compile 4.3.30-2 on this server, but the result
didn't change (still does not work as expected).


Since you wrote, that 4.3.30-1build3 (from Ubuntu 23.10) worked
without problems, I downloaded the source of 4.3.30-1 and did another
build but this also doesn't work without problems.

So from my perspective there is some problem with the compile options
or hardening in Ubuntu 24.04, which breaks the xymon package, while
4.3.30-1build3 used a different build system (Ubuntu 23.10), which
wasn't that strict and didn't run into issues.

Maybe I should compare compiler options between Ubuntu 24.04 and
Debian 12 (and/or Debian unstable) and try to reproduce the issue on
Debian.
Or I should try to find out, where the "buffer overflow detected"
messages come from and fix the root cause.
But that's a job for another day...

Sorry not to have a solution for you now, but this seems to be harder
to fix...

Greetings
Roland

Hi!

On Mon, 23 Sep 2024, I wrote:

Today I dug a bit deeper and found out that the relevant difference
between Debian unstable and Ubuntu 24.04 is, that Ubuntu uses
-D_FORTIFY_SOURCE=3 since 24.04, while Debian still uses
-D_FORTIFY_SOURCE=2.

dpkg-dpkg-buildflags --get CPPFLAGS shows this difference:
Debian unstable: -Wdate-time -D_FORTIFY_SOURCE=2
Ubuntu 24.04:    -Wdate-time -D_FORTIFY_SOURCE=3

To change this behavior just set environment variable
DEB_CPPFLAGS_MAINT_SET="-Wdate-time -D_FORTIFY_SOURCE=2" on Ubuntu
or
DEB_CPPFLAGS_MAINT_SET="-Wdate-time -D_FORTIFY_SOURCE=3" on Debian

This doesn't fix the issue bug shows the problem trigger:
FORTIFY_SOURCE=3 implements better fortification and more security
regarding to buffer overflows, but there seem to be some bugs in xymon
sources, that trigger these checks and stop some modules working.

Next step would be digging deeper and finding the root causes of these
buffer overflows and to fix them, maybe some upstream xymon developer,
since my C skills are quite limited :-(

Greetings
Roland

On Tue, 24 Sep 2024, I wrote:

According to systemd coredumpctl we have at least coredumps in
xymond_client, xymond_rrd and xymond_alert.

Here is the output of gdb bt full for them (maybe someone else
understands more of what the root cause is):

xymond_client:
==============
#0  __pthread_kill_implementation (threadid=<optimized out>, signo=signo@entry=6, no_tid=no_tid@entry=0) at ./nptl/pthread_kill.c:44
        tid = <optimized out>
        ret = 0
        pd = <optimized out>
        old_mask = {__val = {0}}
        ret = <optimized out>
#1  0x00007fd7c6fe1e9f in __pthread_kill_internal (signo=6, threadid=<optimized out>) at ./nptl/pthread_kill.c:78
No locals.
#2  0x00007fd7c6f92fb2 in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
        ret = <optimized out>
#3  0x00007fd7c6f7d472 in __GI_abort () at ./stdlib/abort.c:79
        save_stage = 1
        act = {__sigaction_handler = {sa_handler = 0x20, sa_sigaction = 0x20}, sa_mask = {__val = {0, 0, 0, 0, 0, 0, 0, 0, 140721929553312, 3558782228032748576, 
              1675727637748588544, 94097479924736, 94097479924736, 140721929553552, 94097479835289, 140721929553696}}, sa_flags = 2, sa_restorer = 0x7ffc609f85a0}
#4  0x00007fd7c6fd6430 in __libc_message (action=action@entry=do_abort, fmt=fmt@entry=0x7fd7c70f0210 "*** %s ***: terminated\n") at ../sysdeps/posix/libc_fatal.c:155
        ap = {{gp_offset = 24, fp_offset = 0, overflow_arg_area = 0x7ffc609f86f0, reg_save_area = 0x7ffc609f8680}}
        fd = <optimized out>
        list = <optimized out>
        nlist = <optimized out>
        cp = <optimized out>
#5  0x00007fd7c706f0f2 in __GI___fortify_fail (msg=msg@entry=0x7fd7c70f01b6 "buffer overflow detected") at ./debug/fortify_fail.c:26
No locals.
#6  0x00007fd7c706dc00 in __GI___chk_fail () at ./debug/chk_fail.c:28
No locals.
#7  0x00007fd7c706d835 in ___snprintf_chk (s=s@entry=0x5594c6dd7c02 <md_string+2> "", maxlen=maxlen@entry=35, flag=flag@entry=2, slen=slen@entry=31, 
    format=format@entry=0x5594c6dc1e99 "%02x") at ./debug/snprintf_chk.c:29
        mode = <optimized out>
        ap = {{gp_offset = 48, fp_offset = 48, overflow_arg_area = 0x7ffc609f8800, reg_save_area = 0x7ffc609f8740}}
        ret = <optimized out>
#8  0x00005594c6db7581 in snprintf (__fmt=0x5594c6dc1e99 "%02x", __n=35, __s=0x5594c6dd7c02 <md_string+2> "") at /usr/include/x86_64-linux-gnu/bits/stdio2.h:54
No locals.
#9  md5hash (
    input=input@entry=0x5594c83023e0 "#\n# Master configuration file for Xymon\n#\n# This file defines several things:\n#\n# 1) By adding hosts to this file, you define hosts that are monitored by Xymon\n# 2) By adding \"page\", \"subpage\", \"group"...) at ./lib/digest.c:44
        ctx = 0x5594c83023a0
        md_value = "\301tJ\342^\312T\032bGjɨ\f\267I"
        md_string = "c1", '\000' <repeats 30 times>
        i = 1
        p = 0x5594c6dd7c02 <md_string+2> ""
#10 0x00005594c6db2c39 in prepare_fromnet () at ./lib/loadhosts_file.c:104
        sres = 0x5594c83023a0
        sendstat = <optimized out>
        fdata = 0x5594c83023e0 "#\n# Master configuration file for Xymon\n#\n# This file defines several things:\n#\n# 1) By adding hosts to this file, you define hosts that are monitored by Xymon\n# 2) By adding \"page\", \"subpage\", \"group"...
        fhash = <optimized out>
        contentmd5 = '\000' <repeats 32 times>
        sres = <optimized out>
        sendstat = <optimized out>
        fdata = <optimized out>
        fhash = <optimized out>
#11 load_hostnames (hostsfn=0x7ffc609fb889 "/usr/lib/xymon/server/etc/hosts.cfg", extrainclude=extrainclude@entry=0x0, fqdn=fqdn@entry=1) at ./lib/loadhosts_file.c:142
        prepresult = <optimized out>
        ip1 = 0
        ip2 = 0
        ip3 = 0
        ip4 = 0
        groupid = <optimized out>
        pageidx = <optimized out>
        hostname = '\000' <repeats 40 times>, "z\033\036\307\327\177\000\000\000\000\000\000\000\000\000\000\300\215\237`\374\177\000\000 \220 \307\327\177\000\000h\345\035\307\327\177\000\000\006\000\000\000\004\000\000\000@\000\000\000\000\000\000\000@\000\000\000\000\000\000\000@\000\000\000\000\000\000\000\020\003\000\000\000\000\000\000\020\003\000\000\000\000\000\000\b\000\000\000\000\000\000\000\003\000\000\000\004\000\000\000\360\n\032\000\000\000\000\000\360\n\032\000\000\000\000\000\360\n\032\000\000\000\000\000\034\000\000\000\000\000\000\000\034\000\000\000\000\000\000\000\020\000\000\000\000\000\000\000\001\000\000\000\004", '\000' <repeats 27 times>...
        dgname = 0x0
        dgname_buflen = 0
        curtoppage = <optimized out>
        curpage = <optimized out>
        pgtail = <optimized out>
        htree = <optimized out>
        cfgdata = <optimized out>
        inbol = <optimized out>
        ineol = <optimized out>
        insavchar = 0 '\000'
#12 0x00005594c6d83b59 in main (argc=<optimized out>, argv=0x7ffc609f9c48) at ./xymond/xymond_client.c:2181
        eoln = <optimized out>
        restofmsg = <optimized out>
        p = <optimized out>
        metadata = {0x41564952 <error: Cannot access memory at address 0x41564952>, 0x0, 0x62696c5f5f004554 <error: Cannot access memory at address 0x62696c5f5f004554>, 
          0x5f796c7261655f63 <error: Cannot access memory at address 0x5f796c7261655f63>, 0x60 <error: Cannot access memory at address 0x60>, 0x0, 
          0x18 <error: Cannot access memory at address 0x18>, 0x0 <repeats 14 times>}
        metacount = <optimized out>
        nowtimer = 308
        msg = 0x7fd7c6ed2010 "@@client#1/xymon12.sail.spinnaker.de|1727205554.416384|127.0.0.1|xymon12.sail.spinnaker.de|linux|linux|\nclient xymon12,sail,spinnaker,de.linux linux\n[date]\nTue Sep 24 21:19:09 CEST 2024\n[uname]\nLinux "...
        running = 1
        argi = <optimized out>
        seq = 1
        sa = {__sigaction_handler = {sa_handler = 0x5594c6d84450 <sig_handler>, sa_sigaction = 0x5594c6d84450 <sig_handler>}, sa_mask = {__val = {0 <repeats 16 times>}}, 
          sa_flags = 0, sa_restorer = 0x0}
        nextconfigload = 908
        configfn = <optimized out>
        collectors = 0x5594c83022a0


xymond_rrd:
===========
#0  __pthread_kill_implementation (threadid=<optimized out>, signo=signo@entry=6, no_tid=no_tid@entry=0) at ./nptl/pthread_kill.c:44
        tid = <optimized out>
        ret = 0
        pd = <optimized out>
        old_mask = {__val = {0}}
        ret = <optimized out>
#1  0x00007f892b9cee9f in __pthread_kill_internal (signo=6, threadid=<optimized out>) at ./nptl/pthread_kill.c:78
No locals.
#2  0x00007f892b97ffb2 in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
        ret = <optimized out>
#3  0x00007f892b96a472 in __GI_abort () at ./stdlib/abort.c:79
        save_stage = 1
        act = {__sigaction_handler = {sa_handler = 0x20, sa_sigaction = 0x20}, sa_mask = {__val = {0, 0, 0, 0, 0, 0, 0, 0, 140720416982192, 3558782991895767008, 
              8200057225952544256, 94861342943168, 94861342943168, 140720416982432, 94861342820529, 140720416982576}}, sa_flags = 2, sa_restorer = 0x7ffc067784b0}
#4  0x00007f892b9c3430 in __libc_message (action=action@entry=do_abort, fmt=fmt@entry=0x7f892badd210 "*** %s ***: terminated\n") at ../sysdeps/posix/libc_fatal.c:155
        ap = {{gp_offset = 24, fp_offset = 0, overflow_arg_area = 0x7ffc06778600, reg_save_area = 0x7ffc06778590}}
        fd = <optimized out>
        list = <optimized out>
        nlist = <optimized out>
        cp = <optimized out>
#5  0x00007f892ba5c0f2 in __GI___fortify_fail (msg=msg@entry=0x7f892badd1b6 "buffer overflow detected") at ./debug/fortify_fail.c:26
No locals.
#6  0x00007f892ba5ac00 in __GI___chk_fail () at ./debug/chk_fail.c:28
No locals.
#7  0x00007f892ba5a835 in ___snprintf_chk (s=s@entry=0x5646a0a627c2 <md_string+2> "", maxlen=maxlen@entry=35, flag=flag@entry=2, slen=slen@entry=31, 
    format=format@entry=0x5646a0a448b1 "%02x") at ./debug/snprintf_chk.c:29
        mode = <optimized out>
        ap = {{gp_offset = 48, fp_offset = 48, overflow_arg_area = 0x7ffc06778710, reg_save_area = 0x7ffc06778650}}
        ret = <optimized out>
#8  0x00005646a0a2a481 in snprintf (__fmt=0x5646a0a448b1 "%02x", __n=35, __s=0x5646a0a627c2 <md_string+2> "") at /usr/include/x86_64-linux-gnu/bits/stdio2.h:54
No locals.
#9  md5hash (
    input=input@entry=0x5646a26010d0 "#\n# Master configuration file for Xymon\n#\n# This file defines several things:\n#\n# 1) By adding hosts to this file, you define hosts that are monitored by Xymon\n# 2) By adding \"page\", \"subpage\", \"group"...) at ./lib/digest.c:44
        ctx = 0x5646a26000c0
        md_value = "\301tJ\342^\312T\032bGjɨ\f\267I"
        md_string = "c1", '\000' <repeats 30 times>
        i = 1
        p = 0x5646a0a627c2 <md_string+2> ""
#10 0x00005646a0a3d699 in prepare_fromnet () at ./lib/loadhosts_file.c:104
        sres = 0x5646a26000c0
        sendstat = <optimized out>
        fdata = 0x5646a26010d0 "#\n# Master configuration file for Xymon\n#\n# This file defines several things:\n#\n# 1) By adding hosts to this file, you define hosts that are monitored by Xymon\n# 2) By adding \"page\", \"subpage\", \"group"...
        fhash = <optimized out>
        contentmd5 = '\000' <repeats 32 times>
        sres = <optimized out>
        sendstat = <optimized out>
        fdata = <optimized out>
        fhash = <optimized out>
#11 load_hostnames (hostsfn=0x7ffc0677f88c "/usr/lib/xymon/server/etc/hosts.cfg", extrainclude=extrainclude@entry=0x0, fqdn=fqdn@entry=1) at ./lib/loadhosts_file.c:142
        prepresult = <optimized out>
        ip1 = 0
        ip2 = 0
        ip3 = 0
        ip4 = 0
        groupid = <optimized out>
        pageidx = <optimized out>
        hostname = '\000' <repeats 16 times>, "/usr/lib/xymon/server/etc/rrddefinitions.cfg", '\000' <repeats 3404 times>...
        dgname = 0x0
        dgname_buflen = 0
        curtoppage = <optimized out>
        curpage = <optimized out>
        pgtail = <optimized out>
        htree = <optimized out>
        cfgdata = <optimized out>
        inbol = <optimized out>
        ineol = <optimized out>
        insavchar = 0 '\000'
#12 0x00005646a0a0d08f in main (argc=<optimized out>, argv=<optimized out>) at ./xymond/xymond_rrd.c:329
        eoln = <optimized out>
        ctlbuf = '\000' <repeats 4095 times>
        restofmsg = 0x0
        metacount = <optimized out>
        testname = 0x0
        sender = 0x0
        ldef = 0x0
        n = <optimized out>
        now = 458
        classname = 0x0
        pagepaths = 0x0
        gotcachectlmessage = <optimized out>
        metadata = {0x0 <repeats 21 times>}
        p = <optimized out>
        hostname = 0x0
        tstamp = <optimized out>
        childstat = 0
        msg = 0x7f892877e010 "@@status#8/xymon12.sail.spinnaker.de|1727205704.508355|127.0.0.1||xymon12.sail.spinnaker.de|xymongen|1727207504|green||green|1727205584|0||0||1727205554|linux||0|\nstatus xymon12,sail,spinnaker,de.xymo"...
        argi = <optimized out>
        sa = {__sigaction_handler = {sa_handler = 0x5646a0a0d740 <sig_handler>, sa_sigaction = 0x5646a0a0d740 <sig_handler>}, sa_mask = {__val = {0 <repeats 16 times>}}, 
          sa_flags = 0, sa_restorer = 0x0}
        exthandler = <optimized out>
        extids = <optimized out>
        processor = <optimized out>
        ctlsockaddr = {sun_family = 1, sun_path = "/var/lib/xymon/tmp/rrdctl.1656", '\000' <repeats 77 times>}
        ctlsocket = 3
        usebackfeedqueue = 0


xymond_alert:
=============
#0  __pthread_kill_implementation (threadid=<optimized out>, signo=signo@entry=6, no_tid=no_tid@entry=0) at ./nptl/pthread_kill.c:44
        tid = <optimized out>
        ret = 0
        pd = <optimized out>
        old_mask = {__val = {0}}
        ret = <optimized out>
#1  0x00007f7ae955de9f in __pthread_kill_internal (signo=6, threadid=<optimized out>) at ./nptl/pthread_kill.c:78
No locals.
#2  0x00007f7ae950efb2 in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
        ret = <optimized out>
#3  0x00007f7ae94f9472 in __GI_abort () at ./stdlib/abort.c:79
        save_stage = 1
        act = {__sigaction_handler = {sa_handler = 0x20, sa_sigaction = 0x20}, sa_mask = {__val = {0, 0, 0, 0, 0, 0, 0, 0, 140729827760864, 3558781987793485696, 
              18061915719574039552, 93857240661856, 93857240661856, 140729827761104, 93857240583353, 140729827761248}}, sa_flags = 2, sa_restorer = 0x7ffe37649ae0}
#4  0x00007f7ae9552430 in __libc_message (action=action@entry=do_abort, fmt=fmt@entry=0x7f7ae966c210 "*** %s ***: terminated\n") at ../sysdeps/posix/libc_fatal.c:155
        ap = {{gp_offset = 24, fp_offset = 0, overflow_arg_area = 0x7ffe37649c30, reg_save_area = 0x7ffe37649bc0}}
        fd = <optimized out>
        list = <optimized out>
        nlist = <optimized out>
        cp = <optimized out>
#5  0x00007f7ae95eb0f2 in __GI___fortify_fail (msg=msg@entry=0x7f7ae966c1b6 "buffer overflow detected") at ./debug/fortify_fail.c:26
No locals.
#6  0x00007f7ae95e9c00 in __GI___chk_fail () at ./debug/chk_fail.c:28
No locals.
#7  0x00007f7ae95e9835 in ___snprintf_chk (s=s@entry=0x555cd77d3f62 <md_string+2> "", maxlen=maxlen@entry=35, flag=flag@entry=2, slen=slen@entry=31, 
    format=format@entry=0x555cd77c0cb9 "%02x") at ./debug/snprintf_chk.c:29
        mode = <optimized out>
        ap = {{gp_offset = 48, fp_offset = 48, overflow_arg_area = 0x7ffe37649d40, reg_save_area = 0x7ffe37649c80}}
        ret = <optimized out>
#8  0x0000555cd77ba6d1 in snprintf (__fmt=0x555cd77c0cb9 "%02x", __n=35, __s=0x555cd77d3f62 <md_string+2> "") at /usr/include/x86_64-linux-gnu/bits/stdio2.h:54
No locals.
#9  md5hash (
    input=input@entry=0x555cd81e5390 "#\n# Master configuration file for Xymon\n#\n# This file defines several things:\n#\n# 1) By adding hosts to this file, you define hosts that are monitored by Xymon\n# 2) By adding \"page\", \"subpage\", \"group"...) at ./lib/digest.c:44
        ctx = 0x555cd81e5350
        md_value = "\301tJ\342^\312T\032bGjɨ\f\267I"
        md_string = "c1", '\000' <repeats 30 times>
        i = 1
        p = 0x555cd77d3f62 <md_string+2> ""
#10 0x0000555cd77b5d89 in prepare_fromnet () at ./lib/loadhosts_file.c:104
        sres = 0x555cd81e5350
        sendstat = <optimized out>
        fdata = 0x555cd81e5390 "#\n# Master configuration file for Xymon\n#\n# This file defines several things:\n#\n# 1) By adding hosts to this file, you define hosts that are monitored by Xymon\n# 2) By adding \"page\", \"subpage\", \"group"...
        fhash = <optimized out>
        contentmd5 = '\000' <repeats 32 times>
        sres = <optimized out>
        sendstat = <optimized out>
        fdata = <optimized out>
        fhash = <optimized out>
#11 load_hostnames (hostsfn=0x7ffe3764f88f "/usr/lib/xymon/server/etc/hosts.cfg", extrainclude=extrainclude@entry=0x0, fqdn=fqdn@entry=1) at ./lib/loadhosts_file.c:142
        prepresult = <optimized out>
        ip1 = 0
        ip2 = 0
        ip3 = 0
        ip4 = 0
        groupid = <optimized out>
        pageidx = <optimized out>
        hostname = '\000' <repeats 3720 times>...
        dgname = 0x0
        dgname_buflen = 0
        curtoppage = <optimized out>
        curpage = <optimized out>
        pgtail = <optimized out>
        htree = <optimized out>
        cfgdata = <optimized out>
        inbol = <optimized out>
        ineol = <optimized out>
        insavchar = 0 '\000'
#12 0x0000555cd77a09a8 in main (argc=3, argv=0x7ffe3764d1c8) at ./xymond/xymond_alert.c:533
        msg = <optimized out>
        seq = 0
        argi = <optimized out>
        alertcolors = 56
        alertinterval = 1800
        configfn = <optimized out>
        checkfn = <optimized out>
        loadresult = <optimized out>
        reloadconfigtime = 0
        checkpointinterval = <optimized out>
        acklogfn = '\000' <repeats 2888 times>...
        acklogfd = 0x0
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        notiflogfd = 0x0
        tracefn = <optimized out>
        sa = {__sigaction_handler = {sa_handler = 0x0, sa_sigaction = 0x0}, sa_mask = {__val = {0 <repeats 16 times>}}, sa_flags = 0, sa_restorer = 0x0}
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        lastxmit = 0


Greetings
Roland

Sorry to quote myself all the time, but I hope, that I found/fixed the
root cause now.

On Tue, 24 Sep 2024, I wrote:

Seems that there's a bug in the calculation of the buffer size.
The attached patch should fix this.
At least compilation with -D_FORTIFY_SOURCE=3 using this patch no
longer results in buffer overflow messages on my test system.

Greetings
Roland