| Message ID | 20170510174441.26163-1-danielmicay@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Wed, May 10, 2017 at 10:44 AM, Daniel Micay <danielmicay@gmail.com> wrote: > The protection map is only modified by per-arch init code so it can be > protected from writes after the init code runs. > > This change was extracted from PaX where it's part of KERNEXEC. > > Signed-off-by: Daniel Micay <danielmicay@gmail.com> Thanks! Acked-by: Kees Cook <keescook@chromium.org> -Kees > --- > mm/mmap.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/mm/mmap.c b/mm/mmap.c > index f82741e199c0..3bd5ecd20d4d 100644 > --- a/mm/mmap.c > +++ b/mm/mmap.c > @@ -94,7 +94,7 @@ static void unmap_region(struct mm_struct *mm, > * w: (no) no > * x: (yes) yes > */ > -pgprot_t protection_map[16] = { > +pgprot_t protection_map[16] __ro_after_init = { > __P000, __P001, __P010, __P011, __P100, __P101, __P110, __P111, > __S000, __S001, __S010, __S011, __S100, __S101, __S110, __S111 > }; > -- > 2.12.2 >
diff --git a/mm/mmap.c b/mm/mmap.c index f82741e199c0..3bd5ecd20d4d 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -94,7 +94,7 @@ static void unmap_region(struct mm_struct *mm, * w: (no) no * x: (yes) yes */ -pgprot_t protection_map[16] = { +pgprot_t protection_map[16] __ro_after_init = { __P000, __P001, __P010, __P011, __P100, __P101, __P110, __P111, __S000, __S001, __S010, __S011, __S100, __S101, __S110, __S111 };
The protection map is only modified by per-arch init code so it can be protected from writes after the init code runs. This change was extracted from PaX where it's part of KERNEXEC. Signed-off-by: Daniel Micay <danielmicay@gmail.com> --- mm/mmap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)