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SegFault on Fedora 35 #319

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lbasedow-cw opened this issue Feb 25, 2022 · 17 comments
Closed

SegFault on Fedora 35 #319

lbasedow-cw opened this issue Feb 25, 2022 · 17 comments

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@lbasedow-cw
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Expected behavior:

  • Should be running fine from the system's repos and with default config

Actual behavior:

  • Sementation fault

Steps to reproduce:

  • Install Fedora Server 35
  • Install sslh via dnf
  • Start sslh (e.g. systemctl start sslh)
  • Check status (e.g. systemctl status sslh)

Would be very happy to get this tool running again on the latest Fedora release.

@licaon-kter
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gdb? strace? more info with verbose?

@yrutschle
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yrutschle commented Feb 25, 2022 via email

@lbasedow-cw
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Thank you for the fast reply.
I already had a look there, but the command file sslh-select returned file not found, so I didn't continue.

Now I worked out the next command and here is the output:

valgrind --leak-check=full sslh -v 2 -f
==475305== Memcheck, a memory error detector
==475305== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==475305== Using Valgrind-3.18.1 and LibVEX; rerun with -h for copyright info
==475305== Command: sslh -v 2 -f
==475305==
==475305== Invalid read of size 2
==475305==    at 0x486B9C4: config_setting_is_aggregate (libconfig.c:1772)
==475305==    by 0x486C5EC: config_setting_length (libconfig.c:1591)
==475305==    by 0x406173: cfg_as_string (sslh-conf.c:1684)
==475305==    by 0x406A3C: sslhcfg_cl_parse (sslh-conf.c:1794)
==475305==    by 0x409CB9: main (sslh-main.c:211)
==475305==  Address 0x8 is not stack'd, malloc'd or (recently) free'd
==475305==
==475305==
==475305== Process terminating with default action of signal 11 (SIGSEGV): dumping core
==475305==  Access not within mapped region at address 0x8
==475305==    at 0x486B9C4: config_setting_is_aggregate (libconfig.c:1772)
==475305==    by 0x486C5EC: config_setting_length (libconfig.c:1591)
==475305==    by 0x406173: cfg_as_string (sslh-conf.c:1684)
==475305==    by 0x406A3C: sslhcfg_cl_parse (sslh-conf.c:1794)
==475305==    by 0x409CB9: main (sslh-main.c:211)
==475305==  If you believe this happened as a result of a stack
==475305==  overflow in your program's main thread (unlikely but
==475305==  possible), you can try to increase the size of the
==475305==  main thread stack using the --main-stacksize= flag.
==475305==  The main thread stack size used in this run was 8388608.
==475305==
==475305== HEAP SUMMARY:
==475305==     in use at exit: 3,869 bytes in 28 blocks
==475305==   total heap usage: 33 allocs, 5 frees, 6,393 bytes allocated
==475305==
==475305== LEAK SUMMARY:
==475305==    definitely lost: 0 bytes in 0 blocks
==475305==    indirectly lost: 0 bytes in 0 blocks
==475305==      possibly lost: 0 bytes in 0 blocks
==475305==    still reachable: 3,869 bytes in 28 blocks
==475305==         suppressed: 0 bytes in 0 blocks
==475305== Reachable blocks (those to which a pointer was found) are not shown.
==475305== To see them, rerun with: --leak-check=full --show-leak-kinds=all
==475305==
==475305== For lists of detected and suppressed errors, rerun with: -s
==475305== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)
Speicherzugriffsfehler (Speicherabzug geschrieben)

Hope that helps.

@yrutschle
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yrutschle commented Feb 25, 2022 via email

@lbasedow-cw
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My /etc/sslh.cfg is still the default one that ships with Fedora, I plan to change it afterwards, but first wanted to make sure sslh is up and running.

# This is a basic configuration file that should provide
# sensible values for "standard" setup.

verbose: 0;
foreground: true;
inetd: false;
numeric: false;
transparent: false;
timeout: 2;
user: "sslh";


# Change hostname with your external address name.
listen:
(
    { host: "thelonious"; port: "443"; }
);

protocols:
(
     { name: "ssh"; service: "ssh"; host: "localhost"; port: "22"; fork: true; },
     { name: "openvpn"; host: "localhost"; port: "1194"; },
     { name: "xmpp"; host: "localhost"; port: "5222"; },
     { name: "http"; host: "localhost"; port: "80"; },
     { name: "tls"; host: "localhost"; port: "443"; log_level: 0; },
     { name: "anyprot"; host: "localhost"; port: "443"; }
);

I've sslh version 1.21c and libconfig version 1.7.3.

@k-nard
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k-nard commented Mar 23, 2022

Hi all,

I have the same problem here with F35. Default config.
I don't know if that can help :

# dmesg
[ 7836.122734] sslh[50589]: segfault at 8 ip 00007f3be03019c4 sp 00007ffd6e144778 error 4 in libconfig.so.11.1.0[7f3be0300000+7000]
[ 7836.122738] Code: 66 0f 1f 44 00 00 f3 0f 1e fa 0f bf 47 08 83 e8 02 83 f8 04 0f 96 c0 0f b6 c0 c3 66 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa <0f> b7 57 08 8d 42 f9 66 83 f8 01 0f 96 c0 66 83 fa 01 0f 94 c2 09
[ 7999.110251] sslh[51209]: segfault at 8 ip 00007f349675d9c4 sp 00007ffc3151ebd8 error 4 in libconfig.so.11.1.0[7f349675c000+7000]
[ 7999.110275] Code: 66 0f 1f 44 00 00 f3 0f 1e fa 0f bf 47 08 83 e8 02 83 f8 04 0f 96 c0 0f b6 c0 c3 66 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa <0f> b7 57 08 8d 42 f9 66 83 f8 01 0f 96 c0 66 83 fa 01 0f 94 c2 09
[ 8008.388508] sslh[51311]: segfault at 8 ip 00007f81bebe19c4 sp 00007ffffd89c498 error 4 in libconfig.so.11.1.0[7f81bebe0000+7000]
[ 8008.388515] Code: 66 0f 1f 44 00 00 f3 0f 1e fa 0f bf 47 08 83 e8 02 83 f8 04 0f 96 c0 0f b6 c0 c3 66 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa <0f> b7 57 08 8d 42 f9 66 83 f8 01 0f 96 c0 66 83 fa 01 0f 94 c2 09
[ 8169.803072] sslh[52322]: segfault at 8 ip 00007f318e0eb9c4 sp 00007ffc4b494c28 error 4 in libconfig.so.11.1.0[7f318e0ea000+7000]
[ 8169.803078] Code: 66 0f 1f 44 00 00 f3 0f 1e fa 0f bf 47 08 83 e8 02 83 f8 04 0f 96 c0 0f b6 c0 c3 66 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa <0f> b7 57 08 8d 42 f9 66 83 f8 01 0f 96 c0 66 83 fa 01 0f 94 c2 09
[ 8177.202200] sslh[52411]: segfault at 8 ip 00007f5dbce2e9c4 sp 00007ffd440ce038 error 4 in libconfig.so.11.1.0[7f5dbce2d000+7000]
[ 8177.202223] Code: 66 0f 1f 44 00 00 f3 0f 1e fa 0f bf 47 08 83 e8 02 83 f8 04 0f 96 c0 0f b6 c0 c3 66 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa <0f> b7 57 08 8d 42 f9 66 83 f8 01 0f 96 c0 66 83 fa 01 0f 94 c2 09
[ 8223.886258] sslh[52597]: segfault at 8 ip 00007f5db6ab59c4 sp 00007fff719e43b8 error 4 in libconfig.so.11.1.0[7f5db6ab4000+7000]
[ 8223.886282] Code: 66 0f 1f 44 00 00 f3 0f 1e fa 0f bf 47 08 83 e8 02 83 f8 04 0f 96 c0 0f b6 c0 c3 66 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa <0f> b7 57 08 8d 42 f9 66 83 f8 01 0f 96 c0 66 83 fa 01 0f 94 c2 09
[ 8329.499594] sslh[52831]: segfault at 8 ip 00007f2d3ef809c4 sp 00007fff9df08808 error 4 in libconfig.so.11.1.0[7f2d3ef7f000+7000]
[ 8329.499600] Code: 66 0f 1f 44 00 00 f3 0f 1e fa 0f bf 47 08 83 e8 02 83 f8 04 0f 96 c0 0f b6 c0 c3 66 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa <0f> b7 57 08 8d 42 f9 66 83 f8 01 0f 96 c0 66 83 fa 01 0f 94 c2 09
[ 8339.648932] sslh[52926]: segfault at 8 ip 00007fb2feb7b9c4 sp 00007fff1f380ba8 error 4 in libconfig.so.11.1.0[7fb2feb7a000+7000]
[ 8339.648937] Code: 66 0f 1f 44 00 00 f3 0f 1e fa 0f bf 47 08 83 e8 02 83 f8 04 0f 96 c0 0f b6 c0 c3 66 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa <0f> b7 57 08 8d 42 f9 66 83 f8 01 0f 96 c0 66 83 fa 01 0f 94 c2 09
[ 8343.400765] sslh[53012]: segfault at 8 ip 00007fe5576b49c4 sp 00007ffccccb03a8 error 4 in libconfig.so.11.1.0[7fe5576b3000+7000]
[ 8343.400789] Code: 66 0f 1f 44 00 00 f3 0f 1e fa 0f bf 47 08 83 e8 02 83 f8 04 0f 96 c0 0f b6 c0 c3 66 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa <0f> b7 57 08 8d 42 f9 66 83 f8 01 0f 96 c0 66 83 fa 01 0f 94 c2 09
[ 8363.388849] sslh[53130]: segfault at 8 ip 00007fdbd09819c4 sp 00007ffeaeec69b8 error 4 in libconfig.so.11.1.0[7fdbd0980000+7000]
[ 8363.388855] Code: 66 0f 1f 44 00 00 f3 0f 1e fa 0f bf 47 08 83 e8 02 83 f8 04 0f 96 c0 0f b6 c0 c3 66 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa <0f> b7 57 08 8d 42 f9 66 83 f8 01 0f 96 c0 66 83 fa 01 0f 94 c2 09

@yrutschle
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I just remembered that other old issue: #30 maybe quote the integer parameters for verbose, timeout and log_level?

@k-nard
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k-nard commented Mar 24, 2022

I tried it but same error.

# cat /etc/sslh.cfg 
# This is a basic configuration file that should provide
# sensible values for "standard" setup.

verbose: 0;
foreground: true;
inetd: false;
numeric: false;
transparent: false;
timeout: "2";
user: "sslh";


# Change hostname with your external address name.
listen:
(
    { host: "thelonious"; port: "443"; }
);

protocols:
(
     { name: "ssh"; service: "ssh"; host: "localhost"; port: "22"; fork: true; },
     { name: "openvpn"; host: "localhost"; port: "1194"; },
     { name: "xmpp"; host: "localhost"; port: "5222"; },
     { name: "http"; host: "localhost"; port: "80"; },
     { name: "tls"; host: "localhost"; port: "443"; log_level: 0; },
     { name: "anyprot"; host: "localhost"; port: "443"; }
);

@yrutschle
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you still have verbose: 0; instead of verbose: "0" to test this theory...

@k-nard
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k-nard commented Mar 27, 2022

Oh! I didn't see it.
Indeed, it solves the issue.
Thanks a lot.

@lbasedow-cw
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Author

Thanks for pointing out the quoted integers. I changed my config accordingly:

# This is a basic configuration file that should provide
# sensible values for "standard" setup.

verbose: "0";
foreground: true;
inetd: false;
numeric: false;
transparent: false;
timeout: "2";
user: "sslh";


# Change hostname with your external address name.
listen:
(
    { host: "thelonious"; port: "443"; }
);

protocols:
(
     { name: "ssh"; service: "ssh"; host: "localhost"; port: "22"; fork: true; },
     { name: "openvpn"; host: "localhost"; port: "1194"; },
     { name: "xmpp"; host: "localhost"; port: "5222"; },
     { name: "http"; host: "localhost"; port: "80"; },
     { name: "tls"; host: "localhost"; port: "443"; log_level: "0"; },
     { name: "anyprot"; host: "localhost"; port: "443"; }
)

I hope, I didn't overlook something, but unfortunately it doesn't work for me, but still crashes:

valgrind --leak-check=full sslh -v 2 -f
==3595527== Memcheck, a memory error detector
==3595527== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==3595527== Using Valgrind-3.18.1 and LibVEX; rerun with -h for copyright info
==3595527== Command: sslh -v 2 -f
==3595527==
==3595527== Invalid read of size 2
==3595527==    at 0x486B9C4: config_setting_is_aggregate (libconfig.c:1772)
==3595527==    by 0x486C5EC: config_setting_length (libconfig.c:1591)
==3595527==    by 0x406173: cfg_as_string (sslh-conf.c:1684)
==3595527==    by 0x406A3C: sslhcfg_cl_parse (sslh-conf.c:1794)
==3595527==    by 0x409CB9: main (sslh-main.c:211)
==3595527==  Address 0x8 is not stack'd, malloc'd or (recently) free'd
==3595527==
==3595527==
==3595527== Process terminating with default action of signal 11 (SIGSEGV): dumping core
==3595527==  Access not within mapped region at address 0x8
==3595527==    at 0x486B9C4: config_setting_is_aggregate (libconfig.c:1772)
==3595527==    by 0x486C5EC: config_setting_length (libconfig.c:1591)
==3595527==    by 0x406173: cfg_as_string (sslh-conf.c:1684)
==3595527==    by 0x406A3C: sslhcfg_cl_parse (sslh-conf.c:1794)
==3595527==    by 0x409CB9: main (sslh-main.c:211)
==3595527==  If you believe this happened as a result of a stack
==3595527==  overflow in your program's main thread (unlikely but
==3595527==  possible), you can try to increase the size of the
==3595527==  main thread stack using the --main-stacksize= flag.
==3595527==  The main thread stack size used in this run was 8388608.
==3595527==
==3595527== HEAP SUMMARY:
==3595527==     in use at exit: 3,869 bytes in 28 blocks
==3595527==   total heap usage: 33 allocs, 5 frees, 6,393 bytes allocated
==3595527==
==3595527== LEAK SUMMARY:
==3595527==    definitely lost: 0 bytes in 0 blocks
==3595527==    indirectly lost: 0 bytes in 0 blocks
==3595527==      possibly lost: 0 bytes in 0 blocks
==3595527==    still reachable: 3,869 bytes in 28 blocks
==3595527==         suppressed: 0 bytes in 0 blocks
==3595527== Reachable blocks (those to which a pointer was found) are not shown.
==3595527== To see them, rerun with: --leak-check=full --show-leak-kinds=all
==3595527==
==3595527== For lists of detected and suppressed errors, rerun with: -s
==3595527== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)
Speicherzugriffsfehler (Speicherabzug geschrieben)

Looks like the error output hasn't changed.
Are there any other ideas how to solve it?

I also wonder, why it solved the problem for @k-nard but not for me!?

@lbasedow-cw
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Maybe it would also be an option for me to run sslh via Docker. But I need sslh to split the traffic according to its SNI. Is that possible with Docker? I couldn't find any Docker config option for that in the docs.

@k-nard
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k-nard commented Mar 28, 2022

Oh! I didn't see it. Indeed, it solves the issue. Thanks a lot.

My bad, I tried again when I saw your message. It does not work. I probably test on a F34 yesterday. Sorry.
So yes, same error with integer in double quotes.

# This is a basic configuration file that should provide
# sensible values for "standard" setup.

verbose: "0";
foreground: true;
inetd: false;
numeric: false;
transparent: false;
timeout: "2";
user: "sslh";


# Change hostname with your external address name.
listen:
(
    { host: "thelonious"; port: "443"; }
);

protocols:
(
     { name: "ssh"; service: "ssh"; host: "localhost"; port: "22"; fork: true; },
     { name: "openvpn"; host: "localhost"; port: "1194"; },
     { name: "xmpp"; host: "localhost"; port: "5222"; },
     { name: "http"; host: "localhost"; port: "80"; },
     { name: "tls"; host: "localhost"; port: "443"; log_level: 0; },
     { name: "anyprot"; host: "localhost"; port: "443"; }
);
# valgrind --leak-check=full sslh -v 2 -f
==273== Memcheck, a memory error detector
==273== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==273== Using Valgrind-3.18.1 and LibVEX; rerun with -h for copyright info
==273== Command: sslh -v 2 -f
==273==
==273== Invalid read of size 2
==273==    at 0x48629C4: config_setting_is_aggregate (in /usr/lib64/libconfig.so.11.1.0)
==273==    by 0x48635EC: config_setting_length (in /usr/lib64/libconfig.so.11.1.0)
==273==    by 0x406173: ??? (in /usr/sbin/sslh)
==273==    by 0x406A3C: ??? (in /usr/sbin/sslh)
==273==    by 0x409CB9: ??? (in /usr/sbin/sslh)
==273==    by 0x497655F: (below main) (in /usr/lib64/libc.so.6)
==273==  Address 0x8 is not stack'd, malloc'd or (recently) free'd
==273==
==273==
==273== Process terminating with default action of signal 11 (SIGSEGV)
==273==  Access not within mapped region at address 0x8
==273==    at 0x48629C4: config_setting_is_aggregate (in /usr/lib64/libconfig.so.11.1.0)
==273==    by 0x48635EC: config_setting_length (in /usr/lib64/libconfig.so.11.1.0)
==273==    by 0x406173: ??? (in /usr/sbin/sslh)
==273==    by 0x406A3C: ??? (in /usr/sbin/sslh)
==273==    by 0x409CB9: ??? (in /usr/sbin/sslh)
==273==    by 0x497655F: (below main) (in /usr/lib64/libc.so.6)
==273==  If you believe this happened as a result of a stack
==273==  overflow in your program's main thread (unlikely but
==273==  possible), you can try to increase the size of the
==273==  main thread stack using the --main-stacksize= flag.
==273==  The main thread stack size used in this run was 8388608.
==273==
==273== HEAP SUMMARY:
==273==     in use at exit: 3,869 bytes in 28 blocks
==273==   total heap usage: 33 allocs, 5 frees, 6,393 bytes allocated
==273==
==273== LEAK SUMMARY:
==273==    definitely lost: 0 bytes in 0 blocks
==273==    indirectly lost: 0 bytes in 0 blocks
==273==      possibly lost: 0 bytes in 0 blocks
==273==    still reachable: 3,869 bytes in 28 blocks
==273==         suppressed: 0 bytes in 0 blocks
==273== Reachable blocks (those to which a pointer was found) are not shown.
==273== To see them, rerun with: --leak-check=full --show-leak-kinds=all
==273==
==273== For lists of detected and suppressed errors, rerun with: -s
==273== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)
Segmentation fault (core dumped)
[228558.233545] sslh[494202]: segfault at 8 ip 00007fdc96cdb9c4 sp 00007ffcf9a04b48 error 4 in libconfig.so.11.1.0[7fdc96cda000+7000]
[228558.233552] Code: 66 0f 1f 44 00 00 f3 0f 1e fa 0f bf 47 08 83 e8 02 83 f8 04 0f 96 c0 0f b6 c0 c3 66 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa <0f> b7 57 08 8d 42 f9 66 83 f8 01 0f 96 c0 66 83 fa 01 0f 94 c2 09

@piscesvivian
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The same problem on FC36

  • docker 20.10
  • fedora 36
  • sslh-1.21c-4.fc36.x86_64
(base) sh-5.2# valgrind --leak-check=full sslh -v 2 -f
==4026== Memcheck, a memory error detector
==4026== Copyright (C) 2002-2022, and GNU GPL'd, by Julian Seward et al.
==4026== Using Valgrind-3.19.0 and LibVEX; rerun with -h for copyright info
==4026== Command: sslh -v 2 -f
==4026== 
==4026== Invalid read of size 2
==4026==    at 0x486A934: config_setting_is_aggregate (in /usr/lib64/libconfig.so.11.1.0)
==4026==    by 0x486B4AC: config_setting_length (in /usr/lib64/libconfig.so.11.1.0)
==4026==    by 0x10EC9B: ??? (in /usr/sbin/sslh)
==4026==    by 0x114F9F: ??? (in /usr/sbin/sslh)
==4026==    by 0x10CD54: ??? (in /usr/sbin/sslh)
==4026==    by 0x498550F: (below main) (in /usr/lib64/libc.so.6)
==4026==  Address 0x8 is not stack'd, malloc'd or (recently) free'd
==4026== 
==4026== 
==4026== Process terminating with default action of signal 11 (SIGSEGV)
==4026==  Access not within mapped region at address 0x8
==4026==    at 0x486A934: config_setting_is_aggregate (in /usr/lib64/libconfig.so.11.1.0)
==4026==    by 0x486B4AC: config_setting_length (in /usr/lib64/libconfig.so.11.1.0)
==4026==    by 0x10EC9B: ??? (in /usr/sbin/sslh)
==4026==    by 0x114F9F: ??? (in /usr/sbin/sslh)
==4026==    by 0x10CD54: ??? (in /usr/sbin/sslh)
==4026==    by 0x498550F: (below main) (in /usr/lib64/libc.so.6)
==4026==  If you believe this happened as a result of a stack
==4026==  overflow in your program's main thread (unlikely but
==4026==  possible), you can try to increase the size of the
==4026==  main thread stack using the --main-stacksize= flag.
==4026==  The main thread stack size used in this run was 8388608.
==4026== 
==4026== HEAP SUMMARY:
==4026==     in use at exit: 3,869 bytes in 28 blocks
==4026==   total heap usage: 32 allocs, 4 frees, 5,369 bytes allocated
==4026== 
==4026== LEAK SUMMARY:
==4026==    definitely lost: 0 bytes in 0 blocks
==4026==    indirectly lost: 0 bytes in 0 blocks
==4026==      possibly lost: 0 bytes in 0 blocks
==4026==    still reachable: 3,869 bytes in 28 blocks
==4026==         suppressed: 0 bytes in 0 blocks
==4026== Reachable blocks (those to which a pointer was found) are not shown.
==4026== To see them, rerun with: --leak-check=full --show-leak-kinds=all
==4026== 
==4026== For lists of detected and suppressed errors, rerun with: -s
==4026== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)
Segmentation fault

@h0rmiga
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h0rmiga commented Jun 16, 2023

Hello everyone!
Got same problem with Fedora 37 and Fedora 38.
I've spent some time debugging and I believe I've found where the problem is - it is in "sslhcfg_cl_parse" function in sslh-conf.c.

A line with a problem is: s = config_lookup(&c, "/");, which returns a null pointer, which causes segmentation fault later in res = cfg_as_string(s, "", &errmsg);.
I've tried to replace problematic line with s = config_root_setting(&c); in my local environment and I've managed to compile sslh and run it without any errors.

@yrutschle
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ah. So FWIW this was fixed in sslh two years ago in 24e7f46, following a libconfig evolution (hyperrealm/libconfig#196).

@yrutschle
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yrutschle commented Aug 31, 2023

I assume the answers are satisfactory.

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