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[ID 19991024.001] uninitialized lex as filehandle segmentation fault
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From:
skimo
Date:
October 24, 1999 10:23
Subject:
[ID 19991024.001] uninitialized lex as filehandle segmentation fault
Message ID:
19991024172213.9075.qmail@pool.gv.kotnet.org
This is a bug report for perl from skimo@pool.gv.kotnet.org,
generated with the help of perlbug 1.27 running under perl 5.00562.
-----------------------------------------------------------------
[Please enter your report here]
Using an unitialized lexical as a filehandle can result in
a segmentation fault.
I'm sorry for not having a sample program, but I've
identified the guilty parties.
in pp_rv2gv in pp.c
GV *gv = (GV *) newSV(0);
STRLEN len = 0;
char *name = "";
if (cUNOP->op_first->op_type == OP_PADSV) {
SV *padname = *av_fetch(PL_comppad_name, cUNOP->op_first
->op_targ, 4);
name = SvPV(padname,len);
This code creates an sv with a zero SvPVX.
Later on, in S_pad_findlex in op.c,
this results in a segmentation fault.
if ((sv = svp[off]) &&
sv != &PL_sv_undef &&
seq <= SvIVX(sv) &&
seq > I_32(SvNVX(sv)) &&
strEQ(SvPVX(sv), name))
skimo
[Please do not change anything below this line]
-----------------------------------------------------------------
---
Site configuration information for perl 5.00562:
Configured by skimo at Fri Oct 15 20:57:29 CEST 1999.
Summary of my perl5 (revision 5.0 version 5 subversion 62) configuration:
Platform:
osname=linux, osvers=2.1.125, archname=i586-linux-thread
uname='linux pool 2.1.125 #24 fri oct 16 13:44:56 mest 1998 i586 unknown '
config_args='-Doptimize=-g -Dusethreads -Duseshrplib -Dprefix=/usr -des'
hint=recommended, useposix=true, d_sigaction=define
usethreads=define useperlio=undef d_sfio=undef
use64bits=undef usemultiplicity=undef
Compiler:
cc='cc', optimize='-g', gccversion=egcs-2.91.60 19981201 (egcs-1.1.1 release)
cppflags='-D_REENTRANT -Dbool=char -DHAS_BOOL -DDEBUGGING -fno-strict-aliasing -I/usr/local/include'
ccflags ='-D_REENTRANT -Dbool=char -DHAS_BOOL -DDEBUGGING -fno-strict-aliasing -I/usr/local/include'
stdchar='char', d_stdstdio=define, usevfork=false
intsize=4, longsize=4, ptrsize=4, doublesize=8
d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
alignbytes=4, usemymalloc=n, prototype=define
Linker and Libraries:
ld='cc', ldflags =' -L/usr/local/lib'
libpth=/usr/local/lib /lib /usr/lib
libs=-lnsl -lndbm -ldb -ldl -lm -lpthread -lc -lposix -lcrypt
libc=/lib/libc-2.1.2.so, so=so, useshrplib=true, libperl=libperl.so
Dynamic Linking:
dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-rdynamic -Wl,-rpath,/usr/lib/perl5/5.00562/i586-linux-thread/CORE'
cccdlflags='-fpic', lddlflags='-shared -L/usr/local/lib'
Locally applied patches:
---
@INC for perl 5.00562:
/usr/lib/perl5/5.00562/i586-linux-thread
/usr/lib/perl5/5.00562
/usr/lib/site_perl/5.00562/i586-linux-thread
/usr/lib/site_perl
.
---
Environment for perl 5.00562:
HOME=/home/skimo
LANG (unset)
LANGUAGE (unset)
LD_LIBRARY_PATH (unset)
LOGDIR (unset)
PATH=/home/skimo/bin:/usr/local/bin:/usr/bin:/usr/X11R6/bin:/bin:/usr/openwin/bin:/usr/games/bin:/usr/games:.
PERL_BADLANG (unset)
SHELL=/usr/bin/zsh
Message from the perl bug squashing team at 'perlbug@perl.org'
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[ID 19991024.001] uninitialized lex as filehandle segmentation fault
by skimo