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[perl #133994] Assertion failure in S_regmatch (regexec.c:6162)

From:
Sergey Aleynikov
Date:
April 5, 2019 19:50
Subject:
[perl #133994] Assertion failure in S_regmatch (regexec.c:6162)
Message ID:
rt-4.0.24-24654-1554493832-1637.133994-75-0@perl.org
# New Ticket Created by  Sergey Aleynikov 
# Please include the string:  [perl #133994]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org/Ticket/Display.html?id=133994 >


This is a bug report for perl from sergey.aleynikov@gmail.com,
generated with the help of perlbug 1.41 running under perl 5.29.9.


-----------------------------------------------------------------
[Please describe your issue here]

While fuzzing perl v5.29.9-63-g2496d8f3f7 built with afl and run
under libdislocator, I found the following program

use utf8; q!0 æ! =~ m!\b(*COMMIT)(*FAIL)!

to cause an assertion failure

perl: regexec.c:6162: S_regmatch: Assertion `(((U8*) reginfo->strend)
> (S_reghop3((U8*)locinput, -1, (U8*)(reginfo->strbeg))))' failed.

GDB stack trace is following

#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#1  0x00007ffff7c25535 in __GI_abort () at abort.c:79
#2  0x00007ffff7c2540f in __assert_fail_base (fmt=0x7ffff7d87ee0
"%s%s%s:%u: %s%sAssertion `%s' failed.\n%n",
    assertion=0x555555aeb948 "(((U8*) reginfo->strend) >
(S_reghop3((U8*)locinput, -1, (U8*)(reginfo->strbeg))))",
file=0x555555ae0348 "regexec.c",
    line=6558, function=<optimized out>) at assert.c:92
#3  0x00007ffff7c330f2 in __GI___assert_fail (assertion=0x555555aeb948
"(((U8*) reginfo->strend) > (S_reghop3((U8*)locinput, -1,
(U8*)(reginfo->strbeg))))",
    file=0x555555ae0348 "regexec.c", line=6558,
function=0x555555af30b0 <__PRETTY_FUNCTION__.19772> "S_regmatch") at
assert.c:101
#4  0x00005555558b7e99 in S_regmatch (reginfo=0x7fffffffdca0,
startpos=0x555555b777a5 "U", prog=0x555555b80b3c) at regexec.c:6554
#5  0x00005555558ae0bf in S_regtry (reginfo=0x7fffffffdca0,
startposp=0x7fffffffd7a8) at regexec.c:3956
#6  0x00005555558a2d8c in S_find_byclass (prog=0x555555b79690,
c=0x555555b80b3c, s=0x555555b777a5 "U", strend=0x555555b777a4 "",
reginfo=0x7fffffffdca0)
    at regexec.c:2431
#7  0x00005555558ad12a in Perl_regexec_flags (rx=0x555555b72df0,
stringarg=0x555555b777a0 "0 æ", strend=0x555555b777a4 "",
strbeg=0x555555b777a0 "0 æ",
    minend=0, sv=0x555555b72dd8, data=0x0, flags=97) at regexec.c:3701
#8  0x0000555555769960 in Perl_pp_match () at pp_hot.c:3018
#9  0x000055555570b640 in Perl_runops_debug () at dump.c:2537
#10 0x00005555555ed560 in S_run_body (oldscope=1) at perl.c:2716
#11 0x00005555555ecade in perl_run (my_perl=0x555555b4c260) at perl.c:2639
#12 0x00005555555a114e in main (argc=4, argv=0x7fffffffe188,
env=0x7fffffffe1b0) at perlmain.c:127

This is a regression between 5.24 and 5.26, bisect points to

commit 7a2070659f99247def6a6df08dea5709c01b7877
Author: Karl Williamson <khw@cpan.org>
Date:   Wed Nov 30 09:53:17 2016 -0700

    Convert core (except toke.c) to use isFOO_utf8_safe()

    The previous commit added this feature; now this commit uses it in core.
    toke.c is deferred to the next commit to aid in possible future
    bisecting, because some of the changes there seem somewhat more likely
    to expose bugs.

[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
    category=core
    severity=medium
---
Site configuration information for perl 5.29.9:

Configured by dur-randir at Wed Feb 27 14:51:01 MSK 2019.

Summary of my perl5 (revision 5 version 29 subversion 9) configuration:
  Commit id: c1e47bad34ce1d9c84ed57c9b8978bcbd5a02e98
  Platform:
    osname=darwin
    osvers=13.4.0
    archname=darwin-thread-multi-2level
    uname='darwin isengard.local 13.4.0 darwin kernel version 13.4.0:
mon jan 11 18:17:34 pst 2016; root:xnu-2422.115.15~1release_x86_64
x86_64 '
    config_args='-de -Dusedevel -DDEBUGGING -Dusethreads'
    hint=recommended
    useposix=true
    d_sigaction=define
    useithreads=define
    usemultiplicity=define
    use64bitint=define
    use64bitall=define
    uselongdouble=undef
    usemymalloc=n
    default_inc_excludes_dot=define
    bincompat5005=undef
  Compiler:
    cc='cc'
    ccflags ='-fno-common -DPERL_DARWIN -mmacosx-version-min=10.9
-DDEBUGGING -fno-strict-aliasing -pipe -fstack-protector
-I/usr/local/include -DPERL_USE_SAFE_PUTENV'
    optimize='-O3 -g'
    cppflags='-fno-common -DPERL_DARWIN -mmacosx-version-min=10.9
-DDEBUGGING -fno-strict-aliasing -pipe -fstack-protector
-I/usr/local/include'
    ccversion=''
    gccversion='4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.56)'
    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='cc'
    ldflags =' -mmacosx-version-min=10.9 -fstack-protector -L/usr/local/lib'
    libpth=/usr/local/lib
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/clang/6.0/lib
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib
/usr/lib
    libs=-lpthread -lgdbm -ldbm -ldl -lm -lutil -lc
    perllibs=-lpthread -ldl -lm -lutil -lc
    libc=
    so=dylib
    useshrplib=false
    libperl=libperl.a
    gnulibc_version=''
  Dynamic Linking:
    dlsrc=dl_dlopen.xs
    dlext=bundle
    d_dlsymun=undef
    ccdlflags=' '
    cccdlflags=' '
    lddlflags=' -mmacosx-version-min=10.9 -bundle -undefined
dynamic_lookup -L/usr/local/lib -fstack-protector'


---
@INC for perl 5.29.9:
    lib
    /usr/local/lib/perl5/site_perl/5.29.9/darwin-thread-multi-2level
    /usr/local/lib/perl5/site_perl/5.29.9
    /usr/local/lib/perl5/5.29.9/darwin-thread-multi-2level
    /usr/local/lib/perl5/5.29.9

---
Environment for perl 5.29.9:
    DYLD_LIBRARY_PATH (unset)
    HOME=/Users/dur-randir
    LANG=en_US.UTF-8
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/Users/dur-randir/perlbrew/bin:/Users/dur-randir/perlbrew/perls/perl-5.22.1/bin:/usr/local/bin:/usr/local/sbin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/texbin
    PERLBREW_HOME=/Users/dur-randir/.perlbrew
    PERLBREW_MANPATH=/Users/dur-randir/perlbrew/perls/perl-5.22.1/man
    PERLBREW_PATH=/Users/dur-randir/perlbrew/bin:/Users/dur-randir/perlbrew/perls/perl-5.22.1/bin
    PERLBREW_PERL=perl-5.22.1
    PERLBREW_ROOT=/Users/dur-randir/perlbrew
    PERLBREW_SHELLRC_VERSION=0.84
    PERLBREW_VERSION=0.84
    PERL_BADLANG (unset)
    SHELL=/usr/local/bin/zsh




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