[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH v2 2/2] x86/xpti: don't map stack guard pages
>>> On 02.03.18 at 16:43, <jgross@xxxxxxxx> wrote: > On 02/03/18 15:35, Jan Beulich wrote: >> --- a/xen/arch/x86/mm.c >> +++ b/xen/arch/x86/mm.c >> @@ -5576,6 +5576,14 @@ void memguard_unguard_stack(void *p) >> STACK_SIZE - PRIMARY_STACK_SIZE - IST_MAX * >> PAGE_SIZE); >> } >> >> +bool memguard_is_stack_guard_page(unsigned long addr) >> +{ >> + addr &= STACK_SIZE - 1; >> + >> + return addr >= IST_MAX * PAGE_SIZE && >> + addr < STACK_SIZE - PRIMARY_STACK_SIZE; >> +} >> + > > What about making use of memguard_is_stack_guard_page() in > memguard_[un]guard_stack() ? I was considering this as a follow-up step. > This would at once ensure the other unused > pages won't be accessed accidentally somewhere. I don't understand this part, though. Jan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/xen-devel
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