On Fri, 2019-05-03 at 00:37 +0000, Joel Stanley wrote: > On Thu, 2 May 2019 at 07:42, Russell Currey <rus...@russell.cc> > wrote: > > Implement code to walk all pages and warn if any are found to be > > both > > writable and executable. Depends on STRICT_KERNEL_RWX enabled, and > > is > > behind the DEBUG_WX config option. > > > > This only runs on boot and has no runtime performance implications. > > > > Very heavily influenced (and in some cases copied verbatim) from > > the > > ARM64 code written by Laura Abbott (thanks!), since our ptdump > > infrastructure is similar. > > > > Signed-off-by: Russell Currey <rus...@russell.cc> > > --- > > v2: A myriad of fixes and cleanups thanks to Christophe Leroy > > > > arch/powerpc/Kconfig.debug | 19 ++++++++++++++ > > arch/powerpc/include/asm/pgtable.h | 6 +++++ > > arch/powerpc/mm/pgtable_32.c | 3 +++ > > arch/powerpc/mm/pgtable_64.c | 3 +++ > > arch/powerpc/mm/ptdump/ptdump.c | 41 > > +++++++++++++++++++++++++++++- > > 5 files changed, 71 insertions(+), 1 deletion(-) > > > > diff --git a/arch/powerpc/Kconfig.debug > > b/arch/powerpc/Kconfig.debug > > index 4e00cb0a5464..9e8bcddd8b8f 100644 > > --- a/arch/powerpc/Kconfig.debug > > +++ b/arch/powerpc/Kconfig.debug > > @@ -361,6 +361,25 @@ config PPC_PTDUMP > > > > If you are unsure, say N. > > > > +config PPC_DEBUG_WX > > The other architectures call this DEBUG_WX, in case you wanted to > name > it the same.
I did originally, I changed it since we have PPC_PTDUMP but I don't really care either way. mpe can change it if he wants > > > + bool "Warn on W+X mappings at boot" > > + select PPC_PTDUMP > > + help > > + Generate a warning if any W+X mappings are found at boot.
