Messages in this thread | | | Date | Mon, 8 Jan 2018 18:50:46 +0100 | From | Borislav Petkov <> | Subject | Re: [PATCH RFC 2/4] x86/arch_prctl: add ARCH_GET_NOPTI and ARCH_SET_NOPTI to enable/disable PTI |
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On Mon, Jan 08, 2018 at 05:12:17PM +0100, Willy Tarreau wrote: > This allows to report the current state of the PTI protection and to > enable or disable it for the current task. > > Signed-off-by: Willy Tarreau <w@1wt.eu> > --- > arch/x86/include/uapi/asm/prctl.h | 3 +++ > arch/x86/kernel/process_64.c | 24 ++++++++++++++++++++++++ > 2 files changed, 27 insertions(+) > > diff --git a/arch/x86/include/uapi/asm/prctl.h b/arch/x86/include/uapi/asm/prctl.h > index 5a6aac9..1f1b5bc 100644 > --- a/arch/x86/include/uapi/asm/prctl.h > +++ b/arch/x86/include/uapi/asm/prctl.h > @@ -10,6 +10,9 @@ > #define ARCH_GET_CPUID 0x1011 > #define ARCH_SET_CPUID 0x1012 > > +#define ARCH_GET_NOPTI 0x1021 > +#define ARCH_SET_NOPTI 0x1022 > + > #define ARCH_MAP_VDSO_X32 0x2001 > #define ARCH_MAP_VDSO_32 0x2002 > #define ARCH_MAP_VDSO_64 0x2003 > diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c > index c754662..1686d3d 100644 > --- a/arch/x86/kernel/process_64.c > +++ b/arch/x86/kernel/process_64.c > @@ -654,6 +654,30 @@ long do_arch_prctl_64(struct task_struct *task, int option, unsigned long arg2) > ret = put_user(base, (unsigned long __user *)arg2); > break; > } > + case ARCH_GET_NOPTI: {
Please add a CONFIG_ item for this so that people can disable those.
-- Regards/Gruss, Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
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