Bug#931818: Info received (Bug#931818: cups: Jobs webpage /usr/lib/cups/cgi-bin/jobs.cgi segfault after package login removes /etc/securetty)

[Bernhard Übelacker]

Hello Jeffrey Hundstad,
your supplied backtrace would most likely look with debug symbols like this:

(gdb) bt
#0  __strlen_sse2 () at ../sysdeps/x86_64/multiarch/../strlen.S:79
#1  0x77dcbdae in __GI___strdup () at strdup.c:41
#2  0xb795 in cgiGetArray () at var.c:171
#3  0xa41c in cgi_copy () at template.c:299
#4  0xad3e in cgi_copy () at template.c:348
#5  0xa626 in cgi_copy () at template.c:602
#6  0xb0b7 in cgiCopyTemplateLang () at template.c:148
#7  0x868d in cgiShowJobs () at ipp-var.c:1506
#8  0x67c1 in main () at jobs.c:107
#9  0x77d6809b in __libc_start_main () at ../csu/libc-start.c:308
#10 0x687a in _start ()

But still, the backtrace from a gdb running at your system with
installed debug symbols would most probably show some more information,
and which name in cgiGetArray gets accessed.

Kind regards,
Bernhard

Bug#931818: Info received (Bug#931818: cups: Jobs webpage /usr/lib/cups/cgi-bin/jobs.cgi segfault after package login removes /etc/securetty)

[Bernhard Übelacker]

Hello Jeffrey Hundstad,
sorry, I forget to mention that it would help with the
backtrace if the debug symbols would be installed.
For jobs.cgi I assume this would be cups-dbgsym.

These packages are in a separate repository.
Details are about it are in this page:

https://wiki.debian.org/HowToGetABacktrace#Installing_the_debugging_symbols

Kind regards,
Bernhard

Bug#931818: Info received (Bug#931818: cups: Jobs webpage /usr/lib/cups/cgi-bin/jobs.cgi segfault after package login removes /etc/securetty)

[Hundstad, Jeffrey E]

Here's some more, but not much better:

root@systemname:/usr/share/doc/systemd-coredump# gdb 
/usr/lib/cups/cgi-bin/jobs.cgi /tmp/ooo
GNU gdb (Debian 8.2.1-2) 8.2.1
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Reading symbols from /usr/lib/cups/cgi-bin/jobs.cgi...(no debugging symbols 
found)...done.
[New LWP 26510]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/usr/lib/cups/cgi-bin/jobs.cgi'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  __strlen_avx2 () at ../sysdeps/x86_64/multiarch/strlen-avx2.S:65
65  ../sysdeps/x86_64/multiarch/strlen-avx2.S: No such file or directory.
(gdb) backtrace full
#0  __strlen_avx2 () at ../sysdeps/x86_64/multiarch/strlen-avx2.S:65
No locals.
#1  0x7f16d9130dae in __GI___strdup (s=0x0) at strdup.c:41
len = 
new = 
#2  0x55b36a21f41c in ?? ()
No symbol table info available.
#3  0x55b36a21fd3e in ?? ()
No symbol table info available.
#4  0x55b36a21f626 in ?? ()
No symbol table info available.
#5  0x55b36a2200b7 in ?? ()
No symbol table info available.
#6  0x55b36a21d68d in ?? ()
No symbol table info available.
#7  0x55b36a21b7c1 in ?? ()
No symbol table info available.
#8  0x7f16d90cd09b in __libc_start_main (main=0x55b36a21b670, argc=1, 
argv=0x7ffc607f86d8, init=, fini=, 
rtld_fini=, stack_end=0x7ffc607f86c8) at ../csu/libc-start.c:308
self = 
result = 
unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, -5082858722427954408, 
94229068101712, 140721927456464, 0, 0, -1303763130235512040, 
-1423866795149124840}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 
0x7ffc607f86e8, 0x7f16d9362190}, data = {prev = 0x0, cleanup = 0x0, 
  canceltype = 1618970344}}}
not_first_call = 
#9  0x55b36a21b87a in ?? ()
No symbol table info available.
(gdb) 




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