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[perl #126480] Assert fail w/o other symptoms - pp_sys.c:690Perl_pp_pipe_op when first arg to pipe is definitely not a filehandle

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Dan Collins
October 29, 2015 02:59
[perl #126480] Assert fail w/o other symptoms - pp_sys.c:690Perl_pp_pipe_op when first arg to pipe is definitely not a filehandle
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# New Ticket Created by  Dan Collins 
# Please include the string:  [perl #126480]
# in the subject line of all future correspondence about this issue. 
# <URL: >

Greetings Porters,

I have compiled bleadperl with the afl-gcc compiler using:

./Configure -Dusedevel -Dprefix='/usr/local/perl-afl' -Dcc='ccache afl-gcc' -Duselongdouble -Duse64bitall -Doptimize=-g -Uversiononly -Uman1dir -Uman3dir -des
AFL_HARDEN=1 make && make test

And then fuzzed the resulting binary using:

AFL_NO_VAR_CHECK=1 afl-fuzz -i in -o out bin/perl @@

After reducing testcases using `afl-tmin` and performing additional minimization by hand, I have located the following testcase that triggers an assert fail in DEBUGGING perls without any other symptoms in the normal perl interpreter. The testcase is the file:


dcollins@nightshade64:/usr/local/perl-afl$ ./bin/perl -e 'pipe$$5,0'
perl: pp_sys.c:690: Perl_pp_pipe_op: Assertion `((((rgv)->sv_flags & (0x00004000|0x00008000)) == 0x00008000) && (((svtype)((rgv)->sv_flags & 0xff)) == SVt_PVGV || ((svtype)((rgv)->sv_flags & 0xff)) == SVt_PVLV))' failed.

The output with a normal perl is the expected error:

dcollins@nightshade64:/usr/local/perl-afl$ ~/perl/perl -e 'pipe$$5,0'           
Bad symbol for filehandle at -e line 1.


(gdb) run
Starting program: /usr/local/perl-afl/bin/perl -e pipe\$\$5,0
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/".
bperl: pp_sys.c:690: Perl_pp_pipe_op: Assertion `((((rgv)->sv_flags & (0x00004000|0x00008000)) == 0x00008000) && (((svtype)((rgv)->sv_flags & 0xff)) == SVt_PVGV || ((svtype)((rgv)->sv_flags & 0xff)) == SVt_PVLV))' failed.

Program received signal SIGABRT, Aborted.
0x00007ffff6cf4107 in raise () from /lib/x86_64-linux-gnu/
(gdb) bt
#0  0x00007ffff6cf4107 in raise () from /lib/x86_64-linux-gnu/
#1  0x00007ffff6cf54e8 in abort () from /lib/x86_64-linux-gnu/
#2  0x00007ffff6ced226 in ?? () from /lib/x86_64-linux-gnu/
#3  0x00007ffff6ced2d2 in __assert_fail ()
   from /lib/x86_64-linux-gnu/
#4  0x0000000000b95275 in Perl_pp_pipe_op () at pp_sys.c:690
#5  0x00000000007bdf7f in Perl_runops_debug () at dump.c:2224
#6  0x0000000000527fc1 in S_run_body (oldscope=1) at perl.c:2459
#7  perl_run (my_perl=<optimized out>) at perl.c:2382
#8  0x0000000000428b18 in main (argc=3, argv=0x7fffffffe658,
    env=0x7fffffffe678) at perlmain.c:116
(gdb) f 4
#4  0x0000000000b95275 in Perl_pp_pipe_op () at pp_sys.c:690
690         assert (isGV_with_GP(rgv));
(gdb) info locals
sp = 0x11a8a20
rstio = <optimized out>
wstio = <optimized out>
fd = {0, 0}
wgv = 0x11ba5a0
rgv = 0x11a30a0 <PL_sv_undef>
__PRETTY_FUNCTION__ = "Perl_pp_pipe_op"
(gdb) q
A debugging session is active.

        Inferior 1 [process 4065] will be killed.

Quit anyway? (y or n) y


dcollins@nightshade64:/usr/local/perl-afl$ valgrind ./bin/perl -e 'pipe$$5,0'
==11068== Memcheck, a memory error detector
==11068== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
==11068== Using Valgrind-3.11.0 and LibVEX; rerun with -h for copyright info
==11068== Command: ./bin/perl -e pipe$$5,0
perl: pp_sys.c:690: Perl_pp_pipe_op: Assertion `((((rgv)->sv_flags & (0x00004000|0x00008000)) == 0x00008000) && (((svtype)((rgv)->sv_flags & 0xff)) == SVt_PVGV || ((svtype)((rgv)->sv_flags & 0xff)) == SVt_PVLV))' failed.
==11068== Process terminating with default action of signal 6 (SIGABRT)
==11068==    at 0x5BDC107: raise (raise.c:56)
==11068==    by 0x5BDD4E7: abort (abort.c:89)
==11068==    by 0x5BD5225: __assert_fail_base (assert.c:92)
==11068==    by 0x5BD52D1: __assert_fail (assert.c:101)
==11068==    by 0xB95274: Perl_pp_pipe_op (pp_sys.c:690)
==11068==    by 0x7BDF7E: Perl_runops_debug (dump.c:2224)
==11068==    by 0x527FC0: S_run_body (perl.c:2459)
==11068==    by 0x527FC0: perl_run (perl.c:2382)
==11068==    by 0x428B17: main (perlmain.c:116)
==11068== HEAP SUMMARY:
==11068==     in use at exit: 110,234 bytes in 542 blocks
==11068==   total heap usage: 681 allocs, 139 frees, 134,449 bytes allocated
==11068== LEAK SUMMARY:
==11068==    definitely lost: 176 bytes in 1 blocks
==11068==    indirectly lost: 1,974 bytes in 20 blocks
==11068==      possibly lost: 0 bytes in 0 blocks
==11068==    still reachable: 108,084 bytes in 521 blocks
==11068==         suppressed: 0 bytes in 0 blocks
==11068== Rerun with --leak-check=full to see details of leaked memory
==11068== For counts of detected and suppressed errors, rerun with: -v
==11068== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)

**PERL -V**

dcollins@nightshade64:/usr/local/perl-afl$ ./bin/perl -V
Summary of my perl5 (revision 5 version 23 subversion 5) configuration:
  Commit id: 7195e5da55a40d15e29ad80562668bdd6895441f
    osname=linux, osvers=3.16.0-4-amd64, archname=x86_64-linux-ld
    uname='linux nightshade64 3.16.0-4-amd64 #1 smp debian 3.16.7-ckt11-1+deb8u4 (2015-09-19) x86_64 gnulinux '
    config_args='-Dusedevel -Dprefix=/usr/local/perl-afl -Dcc=ccache afl-gcc -Duselongdouble -Duse64bitall -Doptimize=-g -Uversiononly -Uman1dir -Uman3dir -DDEBUGGING -DPERL_POISON -des'
    hint=recommended, useposix=true, d_sigaction=define
    useithreads=undef, usemultiplicity=undef
    use64bitint=define, use64bitall=define, uselongdouble=define
    usemymalloc=n, bincompat5005=undef
    cc='ccache afl-gcc', ccflags ='-fwrapv -DDEBUGGING -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    cppflags='-fwrapv -DDEBUGGING -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include'
    ccversion='', gccversion='5.2.0', 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='long double', nvsize=16, Off_t='off_t', lseeksize=8
    alignbytes=16, prototype=define
  Linker and Libraries:
    ld='ccache afl-gcc', ldflags =' -fstack-protector-strong -L/usr/local/lib'
    libpth=/usr/local/lib /usr/local/lib/gcc/x86_64-unknown-linux-gnu/5.2.0/include-fixed /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
    libs=-lpthread -lnsl -ldl -lm -lcrypt -lutil -lc
    perllibs=-lpthread -lnsl -ldl -lm -lcrypt -lutil -lc, so=so, useshrplib=false, libperl=libperl.a
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
    cccdlflags='-fPIC', lddlflags='-shared -g -L/usr/local/lib -fstack-protector-strong'

Characteristics of this binary (from libperl):
                        USE_64_BIT_INT USE_LARGE_FILES USE_LOCALE
                        USE_PERLIO USE_PERL_ATOF
  Built under linux
  Compiled at Oct 22 2015 15:44:40

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