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[perl #130651] regcomp.c:6881: REGEXP *Perl_re_op_compile(SV**const, int, OP *, const regexp_engine *, REGEXP *, _Bool *, U32, U32):Assertion `expr' failed
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From:
Sergey Aleynikov
Date:
January 26, 2017 15:13
Subject:
[perl #130651] regcomp.c:6881: REGEXP *Perl_re_op_compile(SV**const, int, OP *, const regexp_engine *, REGEXP *, _Bool *, U32, U32):Assertion `expr' failed
Message ID:
rt-4.0.24-20080-1485443617-903.130651-75-0@perl.org
# New Ticket Created by Sergey Aleynikov
# Please include the string: [perl #130651]
# in the subject line of all future correspondence about this issue.
# <URL: https://rt.perl.org/Ticket/Display.html?id=130651 >
This is a bug report for perl from sergey.aleynikov@gmail.com,
generated with the help of perlbug 1.40 running under perl 5.25.9.
-----------------------------------------------------------------
[Please describe your issue here]
While fuzzing perl v5.25.9-35-g32207c637b built with afl and run
under libdislocator, I found the following program
qr!@{return%0}0[(?{!
to cause an assertion failure on debugging builds and crash on regular
build. This is a regression between v5.16.0 and v5.18.0, bisect points
to
9f141731d83a1ac6294a5580a5b11ff41490309a is the first bad commit
commit 9f141731d83a1ac6294a5580a5b11ff41490309a
Author: David Mitchell <davem@iabyn.com>
Date: Fri Nov 4 10:12:20 2011 +0000
Move bulk of pp_regcomp() into re_op_compile()
When called, pp_regcomp() is presented with a list of SVs on the stack.
Previously, it would perform (amongst other things):
* overloading those SVs;
* concatenating them;
* detection of bare /$qr/;
* detection of unchanged pattern;
optionally followed by a call to the built-in or an external regexp
compiler.
Since we want to avoid premature concatenation (so that we can handle
/$runtime(?{...})/), move all these activities from pp_regcomp() into
re_op_compile().
This makes re_op_compile() a bit cumbersome, with a large arg list,
but I haven't found any way of only moving only a subset of the above.
Note that a side-effect of this is that qr-overloading now works for all
regex compilations, not just those reached via pp_regcomp(); in particular
this now invokes the qr method rather than the "" method if available:
/(??{ $overloaded_object })/
GDB info about the crash location:
(gdb) bt
#0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:58
#1 0x00007f638067840a in __GI_abort () at abort.c:89
#2 0x00007f638066fe47 in __assert_fail_base (fmt=<optimized out>,
assertion=assertion@entry=0x7f6381d5c686 "expr",
file=file@entry=0x7f6381d5a198 "regcomp.c", line=line@entry=6881,
function=function@entry=0x7f6381d63580 <__PRETTY_FUNCTION__.16856>
"Perl_re_op_compile") at assert.c:92
#3 0x00007f638066fef2 in __GI___assert_fail (assertion=0x7f6381d5c686
"expr", file=0x7f6381d5a198 "regcomp.c", line=6881,
function=0x7f6381d63580 <__PRETTY_FUNCTION__.16856>
"Perl_re_op_compile") at assert.c:101
#4 0x00007f6381aa179b in Perl_re_op_compile (patternp=0x7f63838a0b58,
pat_count=0, expr=0x0, eng=0x7f6381fe6540 <PL_core_reg_engine>,
old_re=0x0,
is_bare_re=0x7ffeaf6f0a5a, orig_rx_flags=0, pm_flags=1342177280)
at regcomp.c:6881
#5 0x00007f6381c080f1 in Perl_pp_regcomp () at pp_ctl.c:107
#6 0x00007f6381afb6e9 in Perl_runops_debug () at dump.c:2444
#7 0x00007f63819f4936 in S_run_body (oldscope=1) at perl.c:2528
#8 0x00007f63819f3eb4 in perl_run (my_perl=0x7f638389c010) at perl.c:2451
#9 0x00007f63819aeeee in main (argc=2, argv=0x7ffeaf6f0e28,
env=0x7ffeaf6f0e40) at perlmain.c:123
[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
category=core
severity=medium
---
Site configuration information for perl 5.25.9:
Configured by root at Sat Jan 14 02:25:05 MSK 2017.
Summary of my perl5 (revision 5 version 25 subversion 9) configuration:
Commit id: cbe2fc5001aa59cdc73e04cc35e097a2ecfbeec0
Platform:
osname=linux
osvers=3.16.0-4-amd64
archname=x86_64-linux
uname='linux dorothy 3.16.0-4-amd64 #1 smp debian 3.16.36-1+deb8u2
(2016-10-19) x86_64 gnulinux '
config_args='-des -Dusedevel -DDEBUGGING -Dcc=afl-clang-fast
-Doptimize=-O0 -g -ggdb3'
hint=recommended
useposix=true
d_sigaction=define
useithreads=undef
usemultiplicity=undef
use64bitint=define
use64bitall=define
uselongdouble=undef
usemymalloc=n
bincompat5005=undef
Compiler:
cc='afl-clang-fast'
ccflags ='-DDEBUGGING -fno-strict-aliasing -pipe
-fstack-protector-strong -I/usr/local/include -D_LARGEFILE_SOURCE
-D_FILE_OFFSET_BITS=64 -D_FORTIFY_SOURCE=2'
optimize='-O0 -g -ggdb3'
cppflags='-DDEBUGGING -fno-strict-aliasing -pipe
-fstack-protector-strong -I/usr/local/include'
ccversion=''
gccversion='4.2.1 Compatible Clang 3.9.1 (tags/RELEASE_391/rc2)'
gccosandvers=''
intsize=4
longsize=8
ptrsize=8
doublesize=8
byteorder=12345678
doublekind=3
d_longlong=define
longlongsize=8
d_longdbl=define
longdblsize=16
longdblkind=3
ivtype='long'
ivsize=8
nvtype='double'
nvsize=8
Off_t='off_t'
lseeksize=8
alignbytes=8
prototype=define
Linker and Libraries:
ld='afl-clang-fast'
ldflags =' -fstack-protector-strong -L/usr/local/lib'
libpth=/usr/local/lib /usr/lib/llvm-3.9/bin/../lib/clang/3.9.1/lib
/usr/include/x86_64-linux-gnu /usr/lib /lib/x86_64-linux-gnu
/lib/../lib /usr/lib/x86_64-linux-gnu /usr/lib/../lib /lib
libs=-lpthread -lnsl -ldl -lm -lcrypt -lutil -lc
perllibs=-lpthread -lnsl -ldl -lm -lcrypt -lutil -lc
libc=libc-2.24.so
so=so
useshrplib=false
libperl=libperl.a
gnulibc_version='2.24'
Dynamic Linking:
dlsrc=dl_dlopen.xs
dlext=so
d_dlsymun=undef
ccdlflags='-Wl,-E'
cccdlflags='-fPIC'
lddlflags='-shared -O0 -g -ggdb3 -L/usr/local/lib -fstack-protector-strong'
---
@INC for perl 5.25.9:
lib
/usr/local/lib/perl5/site_perl/5.25.9/x86_64-linux
/usr/local/lib/perl5/site_perl/5.25.9
/usr/local/lib/perl5/5.25.9/x86_64-linux
/usr/local/lib/perl5/5.25.9
---
Environment for perl 5.25.9:
HOME=/home/afl
LANG=en_US.UTF-8
LANGUAGE=en_US:en
LD_LIBRARY_PATH (unset)
LOGDIR (unset)
PATH=/home/afl/perlbrew/bin:/home/afl/perlbrew/perls/perl-5.22.1/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games
PERLBREW_BASHRC_VERSION=0.78
PERLBREW_HOME=/home/afl/.perlbrew
PERLBREW_MANPATH=/home/afl/perlbrew/perls/perl-5.22.1/man
PERLBREW_PATH=/home/afl/perlbrew/bin:/home/afl/perlbrew/perls/perl-5.22.1/bin
PERLBREW_PERL=perl-5.22.1
PERLBREW_ROOT=/home/afl/perlbrew
PERLBREW_VERSION=0.78
PERL_BADLANG (unset)
SHELL=/usr/bin/zsh
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[perl #130651] regcomp.c:6881: REGEXP *Perl_re_op_compile(SV**const, int, OP *, const regexp_engine *, REGEXP *, _Bool *, U32, U32):Assertion `expr' failed
by Sergey Aleynikov