On Thu, Aug 15, 2019 at 5:44 PM Catalin Marinas <catalin.marinas@xxxxxxx> wrote:
>
> Require that arg{3,4,5} of the PR_{SET,GET}_TAGGED_ADDR_CTRL prctl and
> arg2 of the PR_GET_TAGGED_ADDR_CTRL prctl() are zero rather than ignored
> for future extensions.
>
> Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Acked-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
> ---
> kernel/sys.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/kernel/sys.c b/kernel/sys.c
> index c6c4d5358bd3..ec48396b4943 100644
> --- a/kernel/sys.c
> +++ b/kernel/sys.c
> @@ -2499,9 +2499,13 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3,
> error = PAC_RESET_KEYS(me, arg2);
> break;
> case PR_SET_TAGGED_ADDR_CTRL:
> + if (arg3 || arg4 || arg5)
> + return -EINVAL;
> error = SET_TAGGED_ADDR_CTRL(arg2);
> break;
> case PR_GET_TAGGED_ADDR_CTRL:
> + if (arg2 || arg3 || arg4 || arg5)
> + return -EINVAL;
> error = GET_TAGGED_ADDR_CTRL();
> break;
> default:
