Le jeudi 05 novembre 2009 à 17:01 +0100, Marcus Meissner a écrit :
On Thu, Nov 05, 2009 at 02:21:47PM +0100, Yann Droneaud wrote:
Hi,
In a recent post ( http://lwn.net/Articles/360312/ ), Theo de Raadt is criticising Linux page 0 handling. He argue that Linux allows page 0 mapping only for Wine. And OpenBSD won't allow page 0 mapping for security reasons (and performance reasons).
Since Wine seems to be working on other *BSD and derivative systems, is this a problem ?
Could someone comment on this issue. I don't find anything related on http://wiki.winehq.org/OpenBSD
Its actually not a real problem for Wine, last years code works without NULL pages.
It seems many people thinks Wine needs to mmap the page 0 to run common application.
Does Wine 1.0 need it ?
If not, it's really a myth.
Our DOS emulator requires it, as vm86() mode uses 0 based mapping, so DOS programs won't work afterwards. But otherwise I see no dependency. (Perhaps Win16, but I dont think so.)
According to this post from Alexandre Julliard, win16 don't need it.
http://old.nabble.com/Re%3A-vm86-mode-is-not-supported-p23884662.html
Perhaps it could be good point if there's a way to disable DOS emulator at build time ?
Regards