On Mon, Dec 18, 2017 at 12:42:18PM +0100, Thomas Gleixner wrote: > From: Andy Lutomirski <l...@kernel.org> > > If something goes wrong with pagetable setup, vsyscall=native will > accidentally fall back to emulation. Make it warn and fail so that we > notice. > > Signed-off-by: Andy Lutomirski <l...@kernel.org> > Signed-off-by: Ingo Molnar <mi...@kernel.org> > Signed-off-by: Thomas Gleixner <t...@linutronix.de> > Cc: Borislav Petkov <b...@alien8.de> > Cc: Brian Gerst <brge...@gmail.com> > Cc: David Laight <david.lai...@aculab.com> > Cc: Kees Cook <keesc...@chromium.org> > Cc: Linus Torvalds <torva...@linux-foundation.org> > Cc: Peter Zijlstra <pet...@infradead.org> > --- > arch/x86/entry/vsyscall/vsyscall_64.c | 4 ++++ > 1 file changed, 4 insertions(+) > > --- a/arch/x86/entry/vsyscall/vsyscall_64.c > +++ b/arch/x86/entry/vsyscall/vsyscall_64.c > @@ -138,6 +138,10 @@ bool emulate_vsyscall(struct pt_regs *re > > WARN_ON_ONCE(address != regs->ip); > > + /* This should be unreachable in NATIVE mode. */ > + if (WARN_ON(vsyscall_mode == NATIVE)) > + return false;
There's this nice warn_bad_vsyscall() thing. Why not use that? -- Regards/Gruss, Boris. SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg) --