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https://issues.apache.org/jira/browse/XERCESC-2179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16966730#comment-16966730
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martin goodall edited comment on XERCESC-2179 at 11/4/19 3:10 PM:
------------------------------------------------------------------
sorry but this is pretty basic and the code is wrong. which bit do you disagree
with below which is exactly as specified in the win32transponder code?
unsigned int var = 0; // this is 32 bits on a 64 bit platform being set to 0
func(LPDWORD *ptr); // function prototype defined as/expects 64 bits as LPDWORD
is a "far/long dword which is 64 bits"
...
func((LPDWORD *) &var); // call to function
...
void func(LPDWORD *ptr)
{ *ptr = 0; // seg - overwrites 64 bits but only 32 bits available }
hope this helps see the bug.
ps - this is compiled with VisualStudio 2019
was (Author: martgoodall):
sorry but this is pretty basic and the code is wrong. which bit do you disagree
with below which is exactly as specified in the win32transponder code?
int short var = 0; // this is 32 bits on a 64 bit platform being set to 0
func(LPDWORD *ptr); // function prototype defined as/expects 64 bits as LPDWORD
is a "far/long dword which is 64 bits"
...
func((LPDWORD *) &var); // call to function
...
void func(LPDWORD *ptr)
{
*ptr = 0; // seg - overwrites 64 bits but only 32 bits available
}
hope this helps see the bug.
ps - this is compiled with VisualStudio 2019
> access violation in win32transservice.cpp with 64 bit compile
> -------------------------------------------------------------
>
> Key: XERCESC-2179
> URL: https://issues.apache.org/jira/browse/XERCESC-2179
> Project: Xerces-C++
> Issue Type: Bug
> Components: DOM
> Affects Versions: 3.2.2
> Reporter: martin goodall
> Assignee: Alberto Massari
> Priority: Blocker
> Fix For: 3.2.3
>
> Attachments: Win32TransService.cpp
>
>
> calls to ::Reg... to get registry info are passing in stack variables that
> are 8 bytes long into functions that overwrite 16 bytes, causing memory
> overwrite and very random segs.
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