On Fri, Dec 01, 2017 at 12:10:00PM -0800, Kees Cook wrote: > Distros have been shipping with CONFIG_STRICT_DEVMEM=y for years now. It > is probably time to flip this default for x86 and arm64.
Should we be defaulting IO_STRICT_DEVMEM on as well? Will > Signed-off-by: Kees Cook <keesc...@chromium.org> > --- > lib/Kconfig.debug | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug > index 947d3e2ed5c2..39b123d04a36 100644 > --- a/lib/Kconfig.debug > +++ b/lib/Kconfig.debug > @@ -1985,7 +1985,7 @@ config STRICT_DEVMEM > bool "Filter access to /dev/mem" > depends on MMU && DEVMEM > depends on ARCH_HAS_DEVMEM_IS_ALLOWED > - default y if TILE || PPC > + default y if TILE || PPC || X86 || ARM64 > ---help--- > If this option is disabled, you allow userspace (root) access to all > of memory, including kernel and userspace memory. Accidental > -- > 2.7.4 > > > -- > Kees Cook > Pixel Security
