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[perl #130675] utf8.c:1418: Perl_utf8n_to_uvchr_error: Assertion `0'failed
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From:
Sergey Aleynikov
Date:
January 30, 2017 20:36
Subject:
[perl #130675] utf8.c:1418: Perl_utf8n_to_uvchr_error: Assertion `0'failed
Message ID:
rt-4.0.24-32469-1485808552-400.130675-75-0@perl.org
# New Ticket Created by Sergey Aleynikov
# Please include the string: [perl #130675]
# in the subject line of all future correspondence about this issue.
# <URL: https://rt.perl.org/Ticket/Display.html?id=130675 >
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 21-bytes program
% hexdump -C ../afl-asan/0051_1
00000000 42 45 47 49 4e 7b 24 5e 48 20 3d 20 2d 31 7d 79 |BEGIN{$^H = -1}y|
00000010 27 30 c1 27 27 |'0.''|
00000015
to cause an assertion failure. This is a regression in blead, bisect points to:
d1f8d421df731c77beff3db92d27dc6ec28589f2 is the first bad commit
commit d1f8d421df731c77beff3db92d27dc6ec28589f2
Author: Karl Williamson <khw@cpan.org>
Date: Mon Dec 19 13:25:06 2016 -0700
utf8.c: Forbid zero-length malformation under DEBUGGING
GDB info about the crash location:
(gdb) bt
#0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:58
#1 0x00007f117cd2f40a in __GI_abort () at abort.c:89
#2 0x00007f117cd26e47 in __assert_fail_base (fmt=<optimized out>,
assertion=assertion@entry=0x7f117ebb23ee "0",
file=file@entry=0x7f117ebdeefc "utf8.c",
line=line@entry=1418, function=function@entry=0x7f117ebe3610
<__PRETTY_FUNCTION__.15300> "Perl_utf8n_to_uvchr_error") at
assert.c:92
#3 0x00007f117cd26ef2 in __GI___assert_fail
(assertion=assertion@entry=0x7f117ebb23ee "0",
file=file@entry=0x7f117ebdeefc "utf8.c", line=line@entry=1418,
function=function@entry=0x7f117ebe3610 <__PRETTY_FUNCTION__.15300>
"Perl_utf8n_to_uvchr_error") at assert.c:101
#4 0x00007f117e9b85f3 in Perl_utf8n_to_uvchr_error (s=<optimized
out>, s@entry=0x7f117f6beca2 "", curlen=curlen@entry=0,
retlen=retlen@entry=0x7ffd49da7d48, flags=flags@entry=0,
errors=0x7ffd49da7c3c, errors@entry=0x0) at utf8.c:1418
#5 0x00007f117e12c02e in S_pmtrans (repl=0x7f117f6beb18,
expr=<optimized out>, o=<optimized out>) at op.c:5421
#6 Perl_pmruntime (o=<optimized out>, expr=<optimized out>,
repl=0x7f117f6beb18, flags=flags@entry=1, floor=<optimized out>) at
op.c:5740
#7 0x00007f117e2b754d in Perl_yyparse (gramtype=gramtype@entry=258)
at perly.y:1204
#8 0x00007f117e172081 in S_parse_body (env=env@entry=0x0,
xsinit=xsinit@entry=0x7f117e0716c0 <xs_init>) at perl.c:2376
#9 0x00007f117e178d3b in perl_parse (my_perl=<optimized out>,
xsinit=0x7f117e0716c0 <xs_init>, argc=<optimized out>, argv=<optimized
out>, env=0x0)
at perl.c:1691
#10 0x00007f117e07129e in main (argc=<optimized out>, argv=<optimized
out>, env=<optimized out>) at perlmain.c:121
[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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