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[Benno Schulenberg <benno@xxxxxxxxxxx>]

When I follow your recipe (touch .the_test.swp; nano the_test), I don't
get a segfault but just  an error message on the status bar:

  [ Error reading lock file ./.the_test.swp: Not enough data read ]

Please try the command 'nano --ignore --locking the_test' instead (to
test only the locking mechanism and exclude any other settings).  And
please paste the output of the command 'locale' -- because pl_PL.UTF
does not look like the name of a locale to me.

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https://bugs.launchpad.net/bugs/1539627

Title:
  Buffer underflow in nano 2.4.2-1ubuntu0.1  causes  SIGSEGV

Status in nano package in Ubuntu:
  New

Bug description:
  nusch@XPS13:~$ touch .the_test.swp
  nusch@XPS13:~$ nano  the_test
  core dumped
  LANG env is ="pl_PL.UTF" without it it doen't Segfault so error is connected with unicode handling.

  Compiling nano from source(apt-get source - so the same version)
  doesn't geneate nano binary which beheaves same way.

  The difference is in libncurses>w< library:
  nusch@XPS13:~$ ldd /bin/nano
   linux-vdso.so.1 =>  (0x00007ffe5cb00000)
   libncursesw.so.5 => /lib/x86_64-linux-gnu/libncursesw.so.5 (0x00007fdec11c5000) << with w
   libtinfo.so.5 => /lib/x86_64-linux-gnu/libtinfo.so.5 (0x00007fdec0f9c000)
   libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fdec0bd1000)
   libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007fdec09cd000)
   /lib64/ld-linux-x86-64.so.2 (0x000055cc1e5d6000)
  nusch@XPS13:~$ ldd /bin/nano_from_src
   linux-vdso.so.1 =>  (0x00007ffd22d48000)
   libncurses.so.5 => /lib/x86_64-linux-gnu/libncurses.so.5 (0x00007f75dc891000) << without w
   libtinfo.so.5 => /lib/x86_64-linux-gnu/libtinfo.so.5 (0x00007f75dc668000)
   libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f75dc29d000)
   libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f75dc099000)
   /lib64/ld-linux-x86-64.so.2 (0x000055f9b15ce000)

  Backtrace of segfault:
  Program received signal SIGSEGV, Segmentation fault.
                                                      0x0000000000404047 in ?? ()
  (gdb) bt
  #0  0x0000000000404047 in ?? ()
  #1  0x00007ffff75d1a40 in __libc_start_main (main=0x403770, argc=2, argv=0x7fffffffe2a8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffe298) at libc-start.c:289
  #2  0x0000000000404329 in ?? ()

  Disassembly of that part of code:
    40401d:       0f 84 3c 01 00 00       je     40415f <__sprintf_chk@plt+0x9ff>
    404023:       83 7c 24 10 00          cmp    DWORD PTR [rsp+0x10],0x0
    404028:       75 0a                   jne    404034 <__sprintf_chk@plt+0x8d4>
    40402a:       81 25 1c e8 22 00 ff    and    DWORD PTR [rip+0x22e81c],0xffffbfff        # 632850 <stderr+0x1f0>
    404031:       bf ff ff
    404034:       48 8b 05 dd e7 22 00    mov    rax,QWORD PTR [rip+0x22e7dd]        # 632818 <stderr+0x1b8>
    40403b:       48 8b 80 90 00 00 00    mov    rax,QWORD PTR [rax+0x90]
    404042:       48 85 c0                test   rax,rax
    404045:       74 0b                   je     404052 <__sprintf_chk@plt+0x8f2>
    404047:       83 78 38 00             cmp    DWORD PTR [rax+0x38],0x0
    40404b:       7e 05                   jle    404052 <__sprintf_chk@plt+0x8f2>
    40404d:       e8 3e fc 00 00          call   413c90 <__sprintf_chk@plt+0x10530>
    404052:       48 8b 7c 24 20          mov    rdi,QWORD PTR [rsp+0x20]
    404057:       48 85 ff                test   rdi,rdi
    40405a:       0f 8e b5 00 00 00       jle    404115 <__sprintf_chk@plt+0x9b5>
    404060:       48 8b 74 24 28          mov    rsi,QWORD PTR [rsp+0x28]

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: nano 2.4.2-1ubuntu0.1
  ProcVersionSignature: Ubuntu 4.2.0-25.30-generic 4.2.6
  Uname: Linux 4.2.0-25-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Fri Jan 29 15:13:25 2016
  InstallationDate: Installed on 2015-05-08 (266 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  SourcePackage: nano
  UpgradeStatus: Upgraded to wily on 2015-11-15 (74 days ago)

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