From: Tanaka Akira <akr@...17n.org>
Date: 2004-10-07T00:00:24+09:00
Subject: [ruby-dev:24439] String#unpack dumps core

次のようにすると core を吐きます。

% ./ruby -e '
str = "\0" * 0x20000
fmt = Object.new
class << fmt; self end.send(:define_method, :to_str) {
  str.replace ""
  "a"
}
p str.unpack(fmt)
'
-e:8: [BUG] Segmentation fault
ruby 1.9.0 (2004-10-06) [i686-linux]

zsh: abort (core dumped)  ./ruby -e 
% gdb ruby core 
GNU gdb 6.1-debian
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i386-linux"...Using host libthread_db library "/lib/libthread_db.so.1".

Core was generated by `./ruby -e 
str = "\0" * 0x20000
fmt = Object.new
class << fmt; self end.send(:d'.
Program terminated with signal 6, Aborted.
Reading symbols from /lib/libdl.so.2...done.
Loaded symbols for /lib/libdl.so.2
Reading symbols from /lib/libcrypt.so.1...done.
Loaded symbols for /lib/libcrypt.so.1
Reading symbols from /lib/libm.so.6...done.
Loaded symbols for /lib/libm.so.6
Reading symbols from /lib/libc.so.6...done.
Loaded symbols for /lib/libc.so.6
Reading symbols from /lib/ld-linux.so.2...done.
Loaded symbols for /lib/ld-linux.so.2
#0  0x4009e721 in kill () from /lib/libc.so.6
(gdb) bt
#0  0x4009e721 in kill () from /lib/libc.so.6
#1  0x4009e4c5 in raise () from /lib/libc.so.6
#2  0x4009f9e8 in abort () from /lib/libc.so.6
#3  0x080d2416 in rb_bug (fmt=0x0) at error.c:214
#4  0x080b0352 in sigsegv (sig=11) at signal.c:446
#5  <signal handler called>
#6  0x400eca97 in memcpy () from /lib/libc.so.6
#7  0x080b337e in str_new (klass=1, ptr=0x813a100 "", len=1075679240) at string.c:71
#8  0x080b33d1 in rb_str_new (ptr=0x1 <Address 0x1 out of bounds>, len=1) at string.c:82
#9  0x0808b49e in infected_str_new (ptr=0x1 <Address 0x1 out of bounds>, len=1, str=1075607996) at pack.c:1154
#10 0x0808bf21 in pack_unpack (str=1075607996, fmt=1075607776) at pack.c:1396
#11 0x08069f32 in call_cfunc (func=0x808b4e0 <pack_unpack>, recv=1075607996, len=135504128, argc=1, argv=0xbfffeae8)
    at eval.c:5364
#12 0x0805e167 in rb_call0 (klass=1075668876, recv=1075607996, id=7273, oid=1, argc=1, argv=0xbfffeae8, body=0x401cf130, 
    nosuper=0) at eval.c:5508
#13 0x0805e418 in rb_call (klass=1075668876, recv=1075607996, mid=7273, argc=1, argv=0xbfffeae8, scope=0) at eval.c:5729
#14 0x08059348 in rb_eval (self=1075673496, n=0x1) at ruby.h:635
#15 0x08059678 in rb_eval (self=1075673496, n=0x1) at ruby.h:664
#16 0x080558db in ruby_exec () at eval.c:1458
#17 0x08055920 in ruby_run () at eval.c:1484
#18 0x080539e5 in main (argc=1, argv=0x1, envp=0xbffff914) at main.c:38
(gdb) 
-- 
[田中 哲][たなか あきら][Tanaka Akira]