linux-kernel - Re: [PATCH RFC 2/4] x86/arch_prctl: add ARCH_GET_NOPTI and ARCH_SET

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Date:   Mon, 8 Jan 2018 18:50:46 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Willy Tarreau <w@....eu>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org, tglx@...utronix.de,
        gnomes@...rguk.ukuu.org.uk, torvalds@...ux-foundation.org
Subject: Re: [PATCH RFC 2/4] x86/arch_prctl: add ARCH_GET_NOPTI and
 ARCH_SET_NOPTI to enable/disable PTI

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@....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.

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