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RE: pthreads works, sorta
- To: "Tak Ota" <Takaaki dot Ota at am dot sony dot com>,<cygwin at cygwin dot com>
- Subject: RE: pthreads works, sorta
- From: "Robert Collins" <robert dot collins at itdomain dot com dot au>
- Date: Wed, 27 Jun 2001 15:33:27 +1000
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.Ota@am.sony.com]
> Sent: Wednesday, June 27, 2001 3:41 PM
> To: cygwin@cygwin.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@redhat.com> wrote:
>
> > On Wed, Jun 27, 2001 at 01:10:35PM +1000, Robert Collins wrote:
> > >> -----Original Message-----
> > >> From: Greg Smith [mailto:gsmith@nc.rr.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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