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Memory leak in Perl_re_op_compile #16036

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p5pRT opened this issue Jun 24, 2017 · 1 comment
Open

Memory leak in Perl_re_op_compile #16036

p5pRT opened this issue Jun 24, 2017 · 1 comment
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@p5pRT
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p5pRT commented Jun 24, 2017

Migrated from rt.perl.org#131643 (status was 'new')

Searchable as RT131643$
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p5pRT commented Jun 24, 2017

From @dur-randir

Created by @dur-randir

While fuzzing perl v5.27.1-37-g4c95ee9f29 built with afl and run
under libdislocator, I found the following program

eval q! m[(?{ 1/0 })] !#while(1)

to leak memory. To observe the leak without ASAN, remove the '#'
symbol. ASAN info about the leaked allocation is​:

=================================================================
==43055==ERROR​: LeakSanitizer​: detected memory leaks

Direct leak of 24 byte(s) in 1 object(s) allocated from​:
  #0 0x4ea970 in calloc (/home/afl/afl-asan/perl+0x4ea970)
  #1 0x860dda in Perl_safesyscalloc /home/afl/afl-asan/util.c​:442​:18
  #2 0x7461e1 in Perl_re_op_compile /home/afl/afl-asan/regcomp.c​:7811​:5
  #3 0x54908f in Perl_pmruntime /home/afl/afl-asan/op.c​:5893​:19
  #4 0x706734 in Perl_yyparse /home/afl/afl-asan/perly.y​:1210​:23
  #5 0xb227bf in S_doeval_compile /home/afl/afl-asan/pp_ctl.c​:3456​:77
  #6 0xb1fa12 in Perl_pp_entereval /home/afl/afl-asan/pp_ctl.c​:4415​:9
  #7 0x85a804 in Perl_runops_debug /home/afl/afl-asan/dump.c​:2451​:23
  #8 0x5f72f5 in S_run_body /home/afl/afl-asan/perl.c​:2548​:2
  #9 0x5f72f5 in perl_run /home/afl/afl-asan/perl.c​:2471
  #10 0x5225c2 in main /home/afl/afl-asan/perlmain.c​:123​:9
  #11 0x7fb63d22c2b0 in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x202b0)

Perl Info 

Flags:
    category=core
    severity=medium

Site configuration information for perl 5.27.1:

Configured by root at Sun May 28 01:44:41 MSK 2017.

Summary of my perl5 (revision 5 version 26 subversion 0) configuration:
  Derived from: 4c95ee9f298c2edfc1382d540ff89288790e78b6
  Platform:
    osname=linux
    osvers=4.9.0-3-amd64
    archname=x86_64-linux
    uname='linux dorothy 4.9.0-3-amd64 #1 smp debian 4.9.25-1
(2017-05-02) x86_64 gnulinux '
    config_args='-des -Dusedevel -DDEBUGGING -Dcc=afl-clang-fast
-Doptimize=-O0 -g -ggdb3 -fno-omit-frame-pointer'
    hint=previous
    useposix=true
    d_sigaction=define
    useithreads=undef
    usemultiplicity=undef
    use64bitint=define
    use64bitall=define
    uselongdouble=undef
    usemymalloc=n
    default_inc_excludes_dot=define
    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 -fno-omit-frame-pointer'
    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
/usr/local/lib /usr/lib/llvm-3.9/bin/../lib/clang/3.9.1/lib
/usr/include/x86_64-linux-gnu /usr/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 -fno-omit-frame-pointer
-L/usr/local/lib -fstack-protector-strong'

Locally applied patches:
    uncommitted-changes


@INC for perl 5.27.1:
    lib
    /usr/local/lib/perl5/site_perl/5.26.0/x86_64-linux
    /usr/local/lib/perl5/site_perl/5.26.0
    /usr/local/lib/perl5/5.26.0/x86_64-linux
    /usr/local/lib/perl5/5.26.0


Environment for perl 5.27.1:
    HOME=/home/afl
    LANG=en_US.UTF-8
    LANGUAGE=en_US:en
    LC_CTYPE=en_US.UTF-8
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/home/afl/perlbrew/bin:/home/afl/perlbrew/perls/perl-5.24.1-dbg/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-5.24.1-dbg/man
    PERLBREW_PATH=/home/afl/perlbrew/bin:/home/afl/perlbrew/perls/perl-5.24.1-dbg/bin
    PERLBREW_PERL=perl-5.24.1-dbg
    PERLBREW_ROOT=/home/afl/perlbrew
    PERLBREW_VERSION=0.78
    PERL_BADLANG (unset)
    SHELL=/usr/bin/zsh

@xenu xenu removed the affects-5.27 label Nov 19, 2021
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