Bug#565703: assertion failures when running with -t switch and tainted @INC
Niko Tyni
ntyni at debian.org
Sun Jan 24 19:02:15 UTC 2010
This is a bug report for perl from Niko Tyni <ntyni at debian.org>,
generated with the help of perlbug 1.39 running under perl 5.11.4.
-----------------------------------------------------------------
A suitable combination of tainted @INC, the '-t' switch and stubs for
undefined constants causes an assertion failure with -DDEBUGGING and
intermittent segmentation faults otherwise.
Originally reported as http://bugs.debian.org/565703, reproducible
on current bleadperl:
% ./perl -t -Ilib -e 'unshift @INC, shift; require Fcntl' foo
Insecure dependency in require while running with -t switch at -e line 1.
Insecure dependency in require while running with -t switch at -e line 1.
Insecure dependency in require while running with -t switch at lib/Fcntl.pm line 58.
Insecure dependency in require while running with -t switch at lib/Fcntl.pm line 58.
Insecure dependency in require while running with -t switch at lib/Fcntl.pm line 58.
Insecure dependency in require while running with -t switch at lib/Fcntl.pm line 62.
Insecure dependency in require while running with -t switch at lib/Fcntl.pm line 62.
Insecure dependency in require while running with -t switch at lib/Fcntl.pm line 62.
perl: gv.c:241: Perl_gv_init: Assertion `!((gv)->sv_flags & 0x00004000)' failed.
zsh: abort (core dumped) ./perl -t -Ilib -e 'unshift @INC, shift; require Fcntl' foo
Other variants include
% echo 'XSLoader::load(q(Fcntl))' > T.pm && ./perl -Ilib -MXSLoader -I. -t -e 'unshift @INC, shift; require T; *a = \&{"Fcntl::S_IFWHT"}' foo
Insecure dependency in require while running with -t switch at -e line 1.
[...]
perl: mg.c:219: Perl_mg_get: Assertion `!(((_svmagic)->sv_flags & (0x40000000|0x00040000)) == (0x40000000|0x00040000))' failed.
and
% echo 'XSLoader::load(q(POSIX))' > T.pm && ./perl -Ilib -MXSLoader -I. -t -e 'unshift @INC, shift; require T; *a = \&{"POSIX::CLK_TCK"}' foo
which fails in the same way.
The problem seems to be related to the stubs for undefined constants;
the ones used above are not defined on this platform.
./perl -Ilib -MPOSIX -E 'say POSIX::CLK_TCK'
Your vendor has not defined POSIX macro CLK_TCK, used at -e line 1
./perl -Ilib -MFcntl -E 'say Fcntl::S_IFWHT'
Your vendor has not defined Fcntl macro S_IFWHT, used at -e line 1.
Blead backtrace of the first case:
Core was generated by `./perl -t -Ilib -e unshift @INC, shift; require Fcntl foo'.
Program terminated with signal 6, Aborted.
#0 0x00007f86090b5f55 in *__GI_raise (sig=<value optimized out>)
at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
64 ../nptl/sysdeps/unix/sysv/linux/raise.c: No such file or directory.
in ../nptl/sysdeps/unix/sysv/linux/raise.c
(gdb) bt
#0 0x00007f86090b5f55 in *__GI_raise (sig=<value optimized out>)
at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
#1 0x00007f86090b8d90 in *__GI_abort () at abort.c:88
#2 0x00007f86090af07a in *__GI___assert_fail (assertion=0x74b9d8 "!((gv)->sv_flags & 0x00004000)",
file=<value optimized out>, line=241, function=0x7524df "Perl_gv_init") at assert.c:78
#3 0x0000000000464e44 in Perl_gv_init (my_perl=0xd20010, gv=0xd7ab10, stash=0xd42898,
name=0xd88528 "S_IFWHT", len=7, multi=2) at gv.c:241
#4 0x000000000046c902 in Perl_gv_fetchpvn_flags (my_perl=0xd20010, nambeg=0xd88528 "S_IFWHT",
full_len=7, flags=3, sv_type=SVt_PVCV) at gv.c:1142
#5 0x000000000046af9b in Perl_gv_fetchsv (my_perl=0xd20010, name=0xd885c0, flags=3, sv_type=SVt_PVCV)
at gv.c:911
#6 0x000000000043eec0 in Perl_ck_rvconst (my_perl=0xd20010, o=0xd89670) at op.c:6788
#7 0x000000000042c343 in Perl_newUNOP (my_perl=0xd20010, type=17, flags=0, first=0xd89630) at op.c:3109
#8 0x000000000043d7b4 in Perl_newCVREF (my_perl=0xd20010, flags=0, o=0xd89630) at op.c:6393
#9 0x00000000004991f2 in Perl_yylex (my_perl=0xd20010) at toke.c:6056
#10 0x00000000004c0fd9 in Perl_yyparse (my_perl=0xd20010) at perly.c:414
#11 0x000000000065280f in S_doeval (my_perl=0xd20010, gimme=2, startop=0x0, outside=0x0, seq=0)
at pp_ctl.c:3089
#12 0x0000000000659836 in Perl_pp_require (my_perl=0xd20010) at pp_ctl.c:3657
#13 0x0000000000518cb7 in Perl_runops_debug (my_perl=0xd20010) at dump.c:2049
#14 0x00000000004548ea in S_run_body (my_perl=0xd20010, oldscope=1) at perl.c:2308
#15 0x0000000000453bb2 in perl_run (my_perl=0xd20010) at perl.c:2233
#16 0x000000000042302d in main (argc=6, argv=0x7fffb80bc108, env=0x7fffb80bc140) at perlmain.c:117
-----------------------------------------------------------------
---
Flags:
category=core
severity=low
---
Site configuration information for perl 5.11.4:
Configured by niko at Sun Jan 24 20:28:38 EET 2010.
Summary of my perl5 (revision 5 version 11 subversion 4) configuration:
Commit id: fe61459e95657c432074058bd8854fec03559335
Platform:
osname=linux, osvers=2.6.32-trunk-amd64, archname=x86_64-linux-gnu-thread-multi
uname='linux madeleine 2.6.32-trunk-amd64 #1 smp sun jan 10 22:40:40 utc 2010 x86_64 gnulinux '
config_args='-Dusethreads -Duselargefiles -Dccflags=-DDEBIAN -Dcccdlflags=-fPIC -Darchname=x86_64-linux-gnu -Dprefix=/usr -Dprivlib=/usr/share/perl/5.11 -Darchlib=/usr/lib/perl/5.11 -Dvendorprefix=/usr -Dvendorlib=/usr/share/perl5 -Dvendorarch=/usr/lib/perl5 -Dsiteprefix=/usr/local -Dsitelib=/usr/local/share/perl/5.11.4 -Dsitearch=/usr/local/lib/perl/5.11.4 -Dman1dir=/usr/share/man/man1 -Dman3dir=/usr/share/man/man3 -Dsiteman1dir=/usr/local/man/man1 -Dsiteman3dir=/usr/local/man/man3 -Dman1ext=1 -Dman3ext=3perl -Dpager=/usr/bin/sensible-pager -Uafs -Ud_csh -Ud_ualarm -Uusesfio -Uusenm -DDEBUGGING=both -Doptimize=-O0 -Dusedevel -Uuseshrplib -des'
hint=recommended, useposix=true, d_sigaction=define
useithreads=define, usemultiplicity=define
useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
use64bitint=define, use64bitall=define, uselongdouble=undef
usemymalloc=n, bincompat5005=undef
Compiler:
cc='cc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -DDEBIAN -DDEBUGGING -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
optimize='-O0 -g',
cppflags='-D_REENTRANT -D_GNU_SOURCE -DDEBIAN -DDEBUGGING -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include'
ccversion='', gccversion='4.4.3 20100108 (prerelease)', gccosandvers=''
intsize=4, longsize=8, ptrsize=8, doublesize=8, byteorder=12345678
d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16
ivtype='long', ivsize=8, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
alignbytes=8, prototype=define
Linker and Libraries:
ld='cc', ldflags =' -fstack-protector -L/usr/local/lib'
libpth=/usr/local/lib /lib /usr/lib /lib64 /usr/lib64
libs=-lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lpthread -lc -lgdbm_compat
perllibs=-lnsl -ldl -lm -lcrypt -lutil -lpthread -lc
libc=/lib/libc-2.10.2.so, so=so, useshrplib=false, libperl=libperl.a
gnulibc_version='2.10.2'
Dynamic Linking:
dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
cccdlflags='-fPIC', lddlflags='-shared -O0 -g -L/usr/local/lib -fstack-protector'
Locally applied patches:
---
@INC for perl 5.11.4:
lib
/usr/local/lib/perl/5.11.4
/usr/local/share/perl/5.11.4
/usr/lib/perl5
/usr/share/perl5
/usr/lib/perl/5.11
/usr/share/perl/5.11
.
---
Environment for perl 5.11.4:
HOME=/home/niko
LANG=en_US.UTF-8
LANGUAGE (unset)
LC_CTYPE=fi_FI.UTF-8
LD_LIBRARY_PATH (unset)
LOGDIR (unset)
PATH=/home/niko/bin:/home/niko/bin:/home/niko/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games:/sbin:/usr/sbin:/sbin:/usr/sbin
PERL_BADLANG (unset)
SHELL=/bin/zsh
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