Segfault on an invalid XML

[Srdjan <sr...@catalyst.net.nz>]

Hi,

We are having some problems with segfaulting when an XML string fails 
validation within eval block. I tried taking a look at it myself, but I 
lost my way in XML::Xerces::Parser. Anyway, I'm sending attached a small 
script, input file with the offending XML and the dtd. I run it as "cat 
segfault.xml | perl xerces_test.pl".
XML::Xerces version is 1.7.0_1, with corresponding libxerces-c1_7_0.so
 Perl details are:
Summary of my perl5 (revision 5.0 version 6 subversion 1) configuration:
  Platform:
    osname=linux, osvers=2.4.13, archname=i386-linux
    uname='linux duende 2.4.13 #1 wed oct 31 19:18:07 est 2001 i686 
unknown '
    config_args='-Dccflags=-DDEBIAN -Dcccdlflags=-fPIC 
-Darchname=i386-linux -Dprefix=/usr -Dprivlib=/usr/share/perl/5.6.1 
-Darchlib=/usr/lib/perl/5.6.1 -Dvendorprefix=/usr 
-Dvendorlib=/usr/share/perl5 -Dvendorarch=/usr/lib/perl5 
-Dsiteprefix=/usr/local -Dsitelib=/usr/local/share/perl/5.6.1 
-Dsitearch=/usr/local/lib/perl/5.6.1 -Dman1dir=/usr/share/man/man1 
-Dman3dir=/usr/share/man/man3 -Dman1ext=1 -Dman3ext=3perl 
-Dpager=/usr/bin/sensible-pager -Uafs -Ud_csh -Uusesfio -Duseshrplib 
-Dlibperl=libperl.so.5.6.1 -Dd_dosuid -des'
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=undef use5005threads=undef useithreads=undef 
usemultiplicity=undef
    useperlio=undef d_sfio=undef uselargefiles=define usesocks=undef
    use64bitint=undef use64bitall=undef uselongdouble=undef
  Compiler:
    cc='cc', ccflags ='-DDEBIAN -fno-strict-aliasing 
-I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    optimize='-O2',
    cppflags='-DDEBIAN -fno-strict-aliasing -I/usr/local/include'
    ccversion='', gccversion='2.95.4  (Debian prerelease)', gccosandvers=''
    intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
    ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', 
lseeksize=8
    alignbytes=4, usemymalloc=n, prototype=define
  Linker and Libraries:
    ld='cc', ldflags =' -L/usr/local/lib'
    libpth=/usr/local/lib /lib /usr/lib
    libs=-lgdbm -ldb -ldl -lm -lc -lcrypt
    perllibs=-ldl -lm -lc -lcrypt
    libc=/lib/libc-2.2.4.so, so=so, useshrplib=true, 
libperl=libperl.so.5.6.1
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-rdynamic'
    cccdlflags='-fPIC', lddlflags='-shared -L/usr/local/lib'


Characteristics of this binary (from libperl):
  Compile-time options: USE_LARGE_FILES
  Built under linux
  Compiled at Jan 11 2002 04:09:18
  %ENV:
    
PERL5LIB="/home/srdjan/srs/dev/registrar/lib/perl5:/home/srdjan/srs/dev/lib/perl5"
  @INC:
    /home/srdjan/srs/dev/registrar/lib/perl5
    /home/srdjan/srs/dev/lib/perl5
    /usr/local/lib/perl/5.6.1
    /usr/local/share/perl/5.6.1
    /usr/lib/perl5
    /usr/share/perl5
    /usr/lib/perl/5.6.1
    /usr/share/perl/5.6.1
    /usr/local/lib/site_perl
    /usr/local/share/perl/5.6.0
    .

Thanks,

Srdjan Jankovic
CatalystIT Ltd

Re: Segfault on an invalid XML

["Jason E. Stewart" <ja...@openinformatics.com>]

"Srdjan" <sr...@catalyst.net.nz> writes:

> Hi,
> 
> We are having some problems with segfaulting when an XML string fails
> validation within eval block. I tried taking a look at it myself, but
> I lost my way in XML::Xerces::Parser. Anyway, I'm sending attached a
> small script, input file with the offending XML and the dtd. I run it
> as "cat segfault.xml | perl xerces_test.pl".

I get a validation error on my machine using perl 5.8, and a segfault
using perl 5.6.1, so it seems like a perl problem, not a xerces
problem.

If you can upgrade your perl, that would be my recommendation. I'm
sorry I can't help more...

Cheers,
jas.

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