* Stephen Smalley <[email protected]> wrote:
> On 10/03/2015 07:27 AM, Ingo Molnar wrote:
> >
> > * Stephen Smalley <[email protected]> wrote:
> >
> >> diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
> >> index 30564e2..f8b1573 100644
> >> --- a/arch/x86/mm/init_64.c
> >> +++ b/arch/x86/mm/init_64.c
> >> @@ -1150,6 +1150,8 @@ void mark_rodata_ro(void)
> >> free_init_pages("unused kernel",
> >> (unsigned long) __va(__pa_symbol(rodata_end)),
> >> (unsigned long) __va(__pa_symbol(_sdata)));
> >> +
> >> + debug_checkwx();
> >
> > Any reason to not do this on NX capable 32-bit kernels as well?
>
> Done in v3. However, I do see lots of W+X mappings there.
Ha! That's a debug check plan gone very well! :)
> [ 1.012796] WARNING: CPU: 1 PID: 1 at arch/x86/mm/dump_pagetables.c:225
> note_page+0x65d/0x840()
> [ 1.012803] x86/mm: Found insecure W+X mapping at address
> f4a00000/0xf4a00000
What does this range correspond to on your kernel?
Thanks,
Ingo
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