develooper Front page | perl.perl5.porters | Postings from April 2019

[perl #134003] Assertion failure in S_ReANY

From:
Sergey Aleynikov
Date:
April 7, 2019 16:51
Subject:
[perl #134003] Assertion failure in S_ReANY
Message ID:
rt-4.0.24-28330-1554655871-1362.134003-75-0@perl.org
# New Ticket Created by  Sergey Aleynikov 
# Please include the string:  [perl #134003]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org/Ticket/Display.html?id=134003 >


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

for(0..6){0if split$p;($$v0l0e)&=($f,$v0l0e)=0;($e)=0}

to cause an assertion failure

perl: ./inline.h:182: struct regexp *S_ReANY(const REGEXP *const):
Assertion `isREGEXP(re)' 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=0x555555ac6c87
"isREGEXP(re)",
    file=0x555555ac6bd0 "inline.h", line=182, function=<optimized
out>) at assert.c:92
#3  0x00007ffff7c330f2 in __GI___assert_fail (assertion=0x555555ac6c87
"isREGEXP(re)", file=0x555555ac6bd0 "inline.h", line=182,
    function=0x555555acda70 <__PRETTY_FUNCTION__.17109> "S_ReANY") at
assert.c:101
#4  0x0000555555821313 in S_ReANY (re=0x555555b68e88) at inline.h:182
#5  0x0000555555822da6 in Perl_pp_regcomp () at pp_ctl.c:106
#6  0x000055555570b89b in Perl_runops_debug () at dump.c:2537
#7  0x00005555555ed560 in S_run_body (oldscope=1) at perl.c:2716
#8  0x00005555555ecade in perl_run (my_perl=0x555555b4c260) at perl.c:2639
#9  0x00005555555a114e in main (argc=3, argv=0x7fffffffe1c8,
env=0x7fffffffe1e8) at perlmain.c:127

While it looks like one from stack-not-refcounted pack, I don't see
how altering $$v0l0e and $f could affect $p. Bisected commit also
seems innocent (this is a blead-only failure)

commit 6ef7fe531911e0b41ffcc04c1d6b6ec25a8b1bc9
Author: Karl Williamson <khw@cpan.org>
Date:   Sun Mar 17 22:11:04 2019 -0600

    PATCH: [perl #131551] Too deep regex compilation recursion

    This patch, started by Yves Orton, and refined in consultation with Tony
    Cook, imposes a maximum depth of unclosed left parentheses, at which
    point it croaks.  This is to prevent the segfault in the ticket.

[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




nntp.perl.org: Perl Programming lists via nntp and http.
Comments to Ask Bjørn Hansen at ask@perl.org | Group listing | About