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panic: paren_elems_to_push #16984

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p5pRT opened this issue Apr 27, 2019 · 2 comments
Open

panic: paren_elems_to_push #16984

p5pRT opened this issue Apr 27, 2019 · 2 comments

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@p5pRT
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p5pRT commented Apr 27, 2019

Migrated from rt.perl.org#134068 (status was 'new')

Searchable as RT134068$

@p5pRT
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p5pRT commented Apr 27, 2019

From @dur-randir

Created by @dur-randir

While fuzzing perl v5.29.10-23-g7c0d7520a3 built with afl and run
under libdislocator, I found the following program

q!000000!=~/((0(*ACCEPT)){6}((0))?0)?(?0)/

to emit 'panic​: paren_elems_to_push, -3 < 0, maxopenparen​: 0
parenfloor​: 1 REGCP_PAREN_ELEMS​: 3' diagnostics. This has never
behaved well.

Perl Info

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

@p5pRT
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p5pRT commented May 12, 2019

From @dur-randir

GDB stacktrace is following

#0 Perl_vcroak (pat=0x555555830b38 "panic​: paren_elems_to_push, %i < 0, maxopenparen​: %i parenfloor​: %i REGCP_PAREN_ELEMS​: %u",
  args=args@​entry=0x7fffffffda70) at util.c​:1709
#1 0x0000555555629609 in Perl_croak (
  pat=pat@​entry=0x555555830b38 "panic​: paren_elems_to_push, %i < 0, maxopenparen​: %i parenfloor​: %i REGCP_PAREN_ELEMS​: %u") at util.c​:1756
#2 0x00005555556a7f6a in S_regcppush (rex=rex@​entry=0x5555558b3170, parenfloor=<optimized out>, maxopenparen=<optimized out>) at regexec.c​:226
#3 0x00005555556b54ed in S_regmatch (prog=<optimized out>, startpos=<optimized out>, reginfo=<optimized out>) at regexec.c​:8041
#4 S_regtry (reginfo=<optimized out>, startposp=<optimized out>) at regexec.c​:3974
#5 0x00005555556bfcba in Perl_regexec_flags (rx=<optimized out>, stringarg=0x5555558b1bb0 "000000", strend=0x5555558b1bb6 "",
  strbeg=0x5555558b1bb0 "000000", minend=<optimized out>, sv=0x5555558aed20, data=0x0, flags=97) at regexec.c​:3837
#6 0x000055555564a33d in Perl_pp_match () at inline.h​:183
#7 0x00005555556448f3 in Perl_runops_standard () at run.c​:42
#8 0x00005555555c53f4 in S_run_body (oldscope=<optimized out>) at perl.c​:2716
#9 perl_run (my_perl=<optimized out>) at perl.c​:2639
#10 0x000055555559f292 in main (argc=<optimized out>, argv=<optimized out>, env=<optimized out>) at perlmain.c​:127

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