Messages in this thread | | | Date | Tue, 6 Oct 2015 09:32:05 +0200 | From | Ingo Molnar <> | Subject | Re: [PATCH v2] x86/mm: warn on W+x mappings |
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* Stephen Smalley <sds@tycho.nsa.gov> wrote:
> On 10/03/2015 07:27 AM, Ingo Molnar wrote: > > > > * Stephen Smalley <sds@tycho.nsa.gov> 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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