| Subject: | USHORT type causes uninitialized memory crash |
I have a function with the protoype of "DWORD __stdcall PtrUShortCall
(DWORD_PTR ptr, USHORT num)". This crashes Win32::API 0.68 with
DEBUGGING Perl 5.12. VS 2003 was used to compile Win32::API 0.68 and the
test DLL and the DEBUGGING Perl 5.12. Changing the USHORT to a DWORD in
the string prototype given
to Win32::API makes everything superficially fine. Changing USHORT to
SHORT causes same exact crash. Changing USHORT to short fails, see way
way down for output of this test case. If I run testdll.pl
on the commandline, the error is "Can't call method "Pack" on an
undefined value at testdll.pl line 8.", if I run it in VS debugger,
which includes the Win32 debugging heap, I get a crash, because of the
BAADF00D poisoning. testdll.dll was generated by running compile.bat. I
am 32 bit Win XP.
Show quoted text
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First-chance exception at 0x2815faf4 (perl512.dll) in perl.exe:
0xC0000005: Access violation reading location 0xbaadf015.
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> perl512.dll!Perl_newSVsv(interpreter * my_perl=0x003940a4, sv * const
old=0xbaadf00d) Line 8099 + 0x3 C
API.dll!XS_Win32__API_Call(interpreter * my_perl=0x003940a4, cv *
cv=0x009603c4) Line 614 + 0x58 C
perl512.dll!Perl_pp_entersub(interpreter * my_perl=0x003940a4) Line
2882 + 0x10 C
perl512.dll!Perl_runops_debug(interpreter * my_perl=0x003940a4) Line
2049 + 0xd C
perl512.dll!S_run_body(interpreter * my_perl=0x003940a4, long
oldscope=1) Line 2308 + 0xd C
perl512.dll!perl_run(interpreter * my_perl=0x003940a4) Line 2233 + 0xd C
perl512.dll!RunPerl(int argc=2, char * * argv=0x00282510, char * *
env=0x002828d8) Line 270 + 0x9 C++
perl.exe!main(int argc=2, char * * argv=0x00282510, char * *
env=0x00282d50) Line 23 + 0x12 C
perl.exe!mainCRTStartup() Line 398 + 0xe C
kernel32.dll!_BaseProcessStart@4() + 0x23
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Line 614 in api.c is
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610
611 ENTER;
612 SAVETMPS;
613 PUSHMARK(SP);
614 XPUSHs(sv_2mortal(newSVsv(origST[i])));
615 PUTBACK;
616 count = call_method("Pack", G_DISCARD);
617 PUTBACK;
618
619 FREETMPS;
620 LEAVE;
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origST array seems to be uninitialized garbage, 8 is "good sized" number
I choose to view the array, var nin is 1 BTW
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- origST,8 0x008346d4 sv * *
+ [0] 0xbaadf00d {sv_any=??? sv_refcnt=??? sv_flags=??? ...} sv *
+ [1] 0xbaadf00d {sv_any=??? sv_refcnt=??? sv_flags=??? ...} sv *
+ [2] 0xabababab {sv_any=??? sv_refcnt=??? sv_flags=??? ...} sv *
+ [3] 0xabababab {sv_any=??? sv_refcnt=??? sv_flags=??? ...} sv *
+ [4] 0xfeeefeee {sv_any=??? sv_refcnt=??? sv_flags=??? ...} sv *
+ [5] 0x00000000 {sv_any=??? sv_refcnt=??? sv_flags=??? ...} sv *
+ [6] 0x00000000 {sv_any=??? sv_refcnt=??? sv_flags=??? ...} sv *
+ [7] 0x00080148 {sv_any=0x000000b0 sv_refcnt=218 sv_flags=1 ...} sv *
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The output of testdll.pl on the command line is
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C:\Documents and Settings\Owner\Desktop\w32api>perl testdll.pl
Win32::API 0.68
Win32::API::new: Loading library 'testdll.dll'
(PM)parse_prototype: got PROC '_PtrUShortCall@8'
(PM)parse_prototype: got PARAMS 'DWORD_PTR ptr, USHORT num'
(PM)parse_prototype: IN='DWORD_PTR' PACKING='L' API_TYPE=1
(PM)parse_prototype: IN='USHORT' PACKING='S' API_TYPE=51
parse_prototype: IN=[ 1 51 ]
parse_prototype: OUT='DWORD' PACKING='L' API_TYPE=1
GetProcAddress('_PtrUShortCall@8') = '3801664'
Object blessed!
Can't call method "Pack" on an undefined value at testdll.pl line 8.
Win32::API::DESTROY: Freeing library 'testdll.dll'
C:\Documents and Settings\Owner\Desktop\w32api>
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The command line output of testdll.pl under VS debugger is
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Win32::API 0.68
Win32::API::new: Loading library 'testdll.dll'
(PM)parse_prototype: got PROC '_PtrUShortCall@8'
(PM)parse_prototype: got PARAMS 'DWORD_PTR ptr, USHORT num'
(PM)parse_prototype: IN='DWORD_PTR' PACKING='L' API_TYPE=1
(PM)parse_prototype: IN='USHORT' PACKING='S' API_TYPE=51
parse_prototype: IN=[ 1 51 ]
parse_prototype: OUT='DWORD' PACKING='L' API_TYPE=1
GetProcAddress('_PtrUShortCall@8') = '3801664'
Object blessed!
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Changing USHORT to short fails, CL output is
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C:\Documents and Settings\Owner\Desktop\w32api>perl testdll.pl
Win32::API 0.68
Win32::API::new: Loading library 'testdll.dll'
(PM)parse_prototype: got PROC '_PtrUShortCall@8'
(PM)parse_prototype: got PARAMS 'DWORD_PTR ptr, short num'
(PM)parse_prototype: IN='DWORD_PTR' PACKING='L' API_TYPE=1
Win32::API::parse_prototype: WARNING unknown parameter type 'short' at
C:/perl51
2/site/lib/Win32/API.pm line 305.
parse_prototype: IN=[ 1 3 ]
parse_prototype: OUT='DWORD' PACKING='L' API_TYPE=1
GetProcAddress('_PtrUShortCall@8') = '3801664'
Object blessed!
exiting
Win32::API::DESTROY: Freeing library 'testdll.dll'
C:\Documents and Settings\Owner\Desktop\w32api>
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C:\Documents and Settings\Owner\Desktop\w32api>perl -V
Summary of my perl5 (revision 5 version 12 subversion 2) configuration:
Platform:
osname=MSWin32, osvers=5.1, archname=MSWin32-x86-multi-thread
uname=''
config_args='undef'
hint=recommended, useposix=true, d_sigaction=undef
useithreads=define, usemultiplicity=define
useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
use64bitint=undef, use64bitall=undef, uselongdouble=undef
usemymalloc=n, bincompat5005=undef
Compiler:
cc='cl', ccflags ='-nologo -GF -W3 -Od -MD -Zi -DDEBUGGING -DWIN32
-D_CONSOL
E -DNO_STRICT -DHAVE_DES_FCRYPT -DPERL_IMPLICIT_CONTEXT
-DPERL_IMPLICIT_SYS -DU
SE_PERLIO',
optimize='-Od -MD -Zi -DDEBUGGING',
cppflags='-DWIN32'
ccversion='13.10.3077', gccversion='', gccosandvers=''
intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234
d_longlong=undef, longlongsize=8, d_longdbl=define, longdblsize=8
ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='__int64',
lseeksi
ze=8
alignbytes=8, prototype=define
Linker and Libraries:
ld='link', ldflags ='-nologo -nodefaultlib -debug
-libpath:"c:\perl512\lib\
CORE" -machine:x86'
libpth="c:\Program Files\Microsoft Visual Studio .NET 2003\VC7\lib"
libs= oldnames.lib kernel32.lib user32.lib gdi32.lib winspool.lib
comdlg32
.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib netapi32.lib
uuid.lib ws2_
32.lib mpr.lib winmm.lib version.lib odbc32.lib odbccp32.lib
comctl32.lib msvcr
t.lib
perllibs= oldnames.lib kernel32.lib user32.lib gdi32.lib
winspool.lib comd
lg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib netapi32.lib
uuid.lib
ws2_32.lib mpr.lib winmm.lib version.lib odbc32.lib odbccp32.lib
comctl32.lib m
svcrt.lib
libc=msvcrt.lib, so=dll, useshrplib=true, libperl=perl512.lib
gnulibc_version=''
Dynamic Linking:
dlsrc=dl_win32.xs, dlext=dll, d_dlsymun=undef, ccdlflags=' '
cccdlflags=' ', lddlflags='-dll -nologo -nodefaultlib -debug
-libpath:"c:\p
erl512\lib\CORE" -machine:x86'
Characteristics of this binary (from libperl):
Compile-time options: DEBUGGING MULTIPLICITY PERL_DONT_CREATE_GVSV
PERL_IMPLICIT_CONTEXT PERL_IMPLICIT_SYS
PERL_MALLOC_WRAP PERL_TRACK_MEMPOOL PL_OP_SLAB_ALLOC
USE_ITHREADS USE_LARGE_FILES USE_PERLIO
USE_PERL_ATOF
Built under MSWin32
Compiled at Mar 23 2011 08:10:43
%ENV:
PERL_JSON_BACKEND="JSON::XS"
PERL_YAML_BACKEND="YAML"
@INC:
C:/perl512/site/lib
C:/perl512/lib
.
C:\Documents and Settings\Owner\Desktop\w32api>
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| Subject: | testdll.pl |
#!/usr/bin/perl -w
#use strict;
use Win32::API;
$| = 1;
$Win32::API::DEBUG = 1;
print "Win32::API $Win32::API::VERSION\n";
my $o = Win32::API->new( 'testdll.dll', 'DWORD __stdcall _PtrUShortCall@8 (DWORD_PTR ptr, USHORT num)');
my $ret = $o->Call(1, 2);
print "exiting\n";
| Subject: | testdll.c |
#include <windows.h>
BOOL APIENTRY _DllMainCRTStartup (HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpReserved )
{
return TRUE;
}
__declspec( dllexport ) DWORD __stdcall PtrUShortCall (DWORD_PTR ptr, USHORT num){
return 1;
}
| Subject: | compile.bat |
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