[ros-dev] Policy question

[Alex Ionescu]

Melissa,

I have forwarded your question to David Cutler.

Best regards,
Alex Ionescu

Myria wrote:
> Should ReactOS copy unnecessary restrictions that Windows has?
> 
> The example I'm thinking of is NtSetLdtEntries.  In Windows NT (and 
> currently ReactOS as well), this function will not let you create an LDT 
> entry whose limit is above the user/kernel barrier.  This restriction sounds 
> like it was made with security in mind, but it doesn't affect security.  The 
> processor's page table will already block access to kernel memory no matter 
> what selector you use.  After all, the default user CS and DS already have a 
> limit of FFFFFFFF.
> 
> Should such a problem be fixed?
> 
> Fireball said "no, unless some 3rd party app or driver depends on them" when 
> I asked about whether such restrictions should be copied.  Pretty much the 
> only thing using NtSetLdtEntries is NTVDM, and this restriction already 
> causes some DOS programs to break that would otherwise work.  (Such programs 
> are usually setting selectors that wrap the address space.)
> 
> Melissa 
> 
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