From @dur-randir

Created by @dur-randir

While fuzzing perl v5.29.8-21-gde59f38ed9 built with afl and run under
libdislocator, I found the following program (also attached to this
message) to either panic() or trigger ASAN diagnostics
heap-use-after-free:

00000000 73 04 7c 30 3f 68 5c 78 7b 33 30 30 7d 28 3f 7b |s.|0?h\x{300}(?{|
00000010 7d 29 04 04 67 72 69 |})..gri|

To trigger ASAN, surround it with 'eval q!!'. ASAN trace is following

==51489==ERROR: AddressSanitizer: heap-use-after-free on address
0x604000009528 at pc 0x000000ca6f2d bp 0x7ffe1cccb540 sp
0x7ffe1cccb538
WRITE of size 8 at 0x604000009528 thread T0
#0 0xca6f2c in S_cleanup_regmatch_info_aux
/home/afl/afl-asan/regexec.c:10074:43
#1 0xb1c83a in Perl_leave_scope /home/afl/afl-asan/scope.c:1269:6
#2 0xb580ad in S_pop_eval_context_maybe_croak
/home/afl/afl-asan/pp_ctl.c:1632:5
#3 0xb576cd in Perl_die_unwind /home/afl/afl-asan/pp_ctl.c:1784:13
#4 0x895c94 in Perl_vcroak /home/afl/afl-asan/util.c:1716:5
#5 0x895c94 in Perl_croak /home/afl/afl-asan/util.c:1761
#6 0xcfaef4 in S_setup_EXACTISH_ST_c1_c2
/home/afl/afl-asan/regexec.c:4558:25
#7 0xcbee68 in S_regmatch /home/afl/afl-asan/regexec.c:8363:31
#8 0xca76bd in S_regtry /home/afl/afl-asan/regexec.c:3933:14
#9 0xc6d2b3 in Perl_regexec_flags /home/afl/afl-asan/regexec.c:3790:7
#10 0x99500c in Perl_pp_subst /home/afl/afl-asan/pp_hot.c:4434:11
#11 0x88f834 in Perl_runops_debug /home/afl/afl-asan/dump.c:2537:23
#12 0x5f1015 in S_run_body /home/afl/afl-asan/perl.c:2692:2
#13 0x5f1015 in perl_run /home/afl/afl-asan/perl.c:2615
#14 0x50b60a in main /home/afl/afl-asan/perlmain.c:127:9
#15 0x7f47a0a2709a in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x2409a)
#16 0x43bdc9 in _start (/home/afl/afl-asan/perl+0x43bdc9)

0x604000009528 is located 24 bytes inside of 48-byte region
[0x604000009510,0x604000009540)
freed by thread T0 here:
#0 0x4da200 in __interceptor_cfree.localalias.0
(/home/afl/afl-asan/perl+0x4da200)
#1 0x89696a in Perl_safesysfree /home/afl/afl-asan/util.c:385:2
#2 0x8c4396 in S_mg_free_struct /home/afl/afl-asan/mg.c:567:5
#3 0x8c4396 in Perl_mg_free /home/afl/afl-asan/mg.c:588
#4 0xa1e210 in Perl_sv_clear /home/afl/afl-asan/sv.c:6598:3
#5 0xa269f7 in Perl_sv_free2 /home/afl/afl-asan/sv.c:7092:9
#6 0xb1ef16 in S_SvREFCNT_dec /home/afl/afl-asan/./inline.h:216:6
#7 0xb1ef16 in Perl_leave_scope /home/afl/afl-asan/scope.c:973
#8 0xb580ad in S_pop_eval_context_maybe_croak
/home/afl/afl-asan/pp_ctl.c:1632:5
#9 0xb576cd in Perl_die_unwind /home/afl/afl-asan/pp_ctl.c:1784:13
#10 0x895c94 in Perl_vcroak /home/afl/afl-asan/util.c:1716:5
#11 0x895c94 in Perl_croak /home/afl/afl-asan/util.c:1761
#12 0xcfaef4 in S_setup_EXACTISH_ST_c1_c2
/home/afl/afl-asan/regexec.c:4558:25
#13 0xcbee68 in S_regmatch /home/afl/afl-asan/regexec.c:8363:31
#14 0xca76bd in S_regtry /home/afl/afl-asan/regexec.c:3933:14
#15 0xc6d2b3 in Perl_regexec_flags /home/afl/afl-asan/regexec.c:3790:7
#16 0x99500c in Perl_pp_subst /home/afl/afl-asan/pp_hot.c:4434:11
#17 0x88f834 in Perl_runops_debug /home/afl/afl-asan/dump.c:2537:23
#18 0x5f1015 in S_run_body /home/afl/afl-asan/perl.c:2692:2
#19 0x5f1015 in perl_run /home/afl/afl-asan/perl.c:2615
#20 0x50b60a in main /home/afl/afl-asan/perlmain.c:127:9
#21 0x7f47a0a2709a in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x2409a)

previously allocated by thread T0 here:
#0 0x4da570 in calloc (/home/afl/afl-asan/perl+0x4da570)
#1 0x896bbe in Perl_safesyscalloc /home/afl/afl-asan/util.c:439:18
#2 0xa115a6 in Perl_sv_magicext /home/afl/afl-asan/sv.c:5684:5
#3 0xc65cc1 in S_setup_eval_state /home/afl/afl-asan/regexec.c:9993:18
#4 0xc65cc1 in Perl_regexec_flags /home/afl/afl-asan/regexec.c:3411
#5 0x992608 in Perl_pp_subst /home/afl/afl-asan/pp_hot.c:4231:10
#6 0x88f834 in Perl_runops_debug /home/afl/afl-asan/dump.c:2537:23
#7 0x5f1015 in S_run_body /home/afl/afl-asan/perl.c:2692:2
#8 0x5f1015 in perl_run /home/afl/afl-asan/perl.c:2615
#9 0x50b60a in main /home/afl/afl-asan/perlmain.c:127:9
#10 0x7f47a0a2709a in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x2409a)

This is a regression in blead, bisect points to

commit a9f8c7a
Author: Karl Williamson <khw@cpan.org>
Date: Tue Nov 27 09:42:45 2018 -0700

Add regnode EXACTFU_ONLY8

This is a regnode that otherwise would be an EXACTFU except that it
contains a code point that requires UTF-8 to match, including all the
possible folds involving it. Hence if the target string isn't UTF-8, we
know it can't possibly match, without needing to try.

For completeness, there could also be an EXACTFAA_ONLY8 and an
EXACTFL_ONLY8 created, but I think these are unlikely to actually appear
in the wild, since using /aa is mainly about ASCII, and /l mostly will
involve characters that don't require UTF-8.

Perl Info


Flags:
    category=core
    severity=high

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

panic: Unexpected op 45 #16873

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