[patch] x86: fix ESP corruption CPU bug

Stas Sergeev stsp at aknet.ru
Sun Mar 13 22:52:55 CST 2005


Linus Torvalds wrote:
> Btw, Stas, one thing I'd really like to see is even a partial list of 
> anything that actually cares about this. Ie, if there is some known 
> Windows app where Wine works better or something like that, just adding
I am not using Wine too much, but I've
found this:
/* due to a flaw in some CPUs (at least mine), it is best to mark stack segments as 32-bit if they
   can be used in 32-bit code. Otherwise, these CPUs may not set the high word of esp during a
   ring transition (from kernel code) to the 16-bit stack, and this causes trouble if executing
   32-bit code using this stack. */
I added win-devel to CC, maybe people there
can tell if that patch has any value for them
or not.
The reference to the original patch:

Dosemu looks a little better on that, the
whole chapter of the docs is dedicated to
that problem:
There you can find a (relatively small)
list of the programs that are affected,
but I personally have the old Microsoft
linker that crashes, and a few more DOS

> Another way of saying the same thing: I absolutely hate seeing patches 
> that fix some theoretical issue that no Linux apps will ever care about. 
No, it is not theoretical, but it is mainly
about a DOS games and an MS linker, as for
me. The things I'd like to get working, but
the ones you may not care too much about:)
The particular game I want to get working,
is "Master of Orion 2" for DOS.

> So I'd like to have a bit more of a case for this patch, since I know what 
> the case against it is ;)
Yep, and the informational leak it closes,
looks also rather minor.
So it is only a matter of how do you care
about the dosemu and the DOS games under
linux. Considering the amount of the
dosemu-related code in vm86.c, I guess you
And uhm, adding the list of the DOS games
to the comments of the Linux kernel code,
doesn't sound like a good idea to me:)

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