Mail Archives: cygwin/2001/06/27/01:57:41
I'm not sure either. If that is the case, replacing IsBadWritePtr
with IsBadReadPtr maybe the answer since can't read mans can't write.
-Tak
On Wed, 27 Jun 2001 15:33:27 +1000, "Robert Collins" <robert DOT collins AT itdomain DOT com DOT au> wrote:
> I'm not sure you can get write but not read memory in win32. Can you? If
> you can, then yes checking both should be done.
>
> Rob
>
>
> > -----Original Message-----
> > From: Tak Ota [mailto:Takaaki DOT Ota AT am DOT sony DOT com]
> > Sent: Wednesday, June 27, 2001 3:41 PM
> > To: cygwin AT cygwin DOT com
> > Subject: Re: pthreads works, sorta
> >
> >
> > How about using IsBadReadPtr in addition to IsBadWritePtr?
> >
> > -Tak
> >
> > On Wed, 27 Jun 2001 01:29:32 -0400, Christopher Faylor
> > <cgf AT redhat DOT com> wrote:
> >
> > > On Wed, Jun 27, 2001 at 01:10:35PM +1000, Robert Collins wrote:
> > > >> -----Original Message-----
> > > >> From: Greg Smith [mailto:gsmith AT nc DOT rr DOT com]
> > > >
> > > >>
> > > >> More experimenting with my home computer, dual pIII 850:
> > > >>
> > > >> 1. 117 157 328
> > > >> 2. 822 1527 ---
> > > >> 3. 194 240 453
> > > >> 4. 169 181 516
> > > >>
> > > >As usual, I write a missive, then solve the puzzle.
> > > >
> > > >try this:
> > > >
> > > >
> > > >int __stdcall
> > > >check_valid_pointer (void *pointer)
> > > >{
> > > > if (!pointer || IsBadWritePtr(pointer, sizeof
> > (verifyable_object)))
> > > > return EFAULT;
> > > > return 0;
> > > >}
> > >
> > > This is not quite the same thing as VirtualQuery. This
> > verifies that the
> > > process can write to memory. It doesn't verify that it is
> > accessible.
> > >
> > > Maybe that is not important but I would have to think about this.
> > >
> > > Nice find, though, Rob.
> > >
> > > cgf
> > >
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