The 07/31/2023 14:43, Mark Brown wrote:
> +SYSCALL_DEFINE3(map_shadow_stack, unsigned long, addr, unsigned long, size, unsigned int, flags)
> +{
> + unsigned long alloc_size;
> + unsigned long __user *cap_ptr;
> + unsigned long cap_val;
> + int ret;
> +
> + if (!system_supports_gcs())
> + return -EOPNOTSUPP;
> +
> + if (flags)
> + return -EINVAL;
> +
> + if (addr % 16)
> + return -EINVAL;
mmap addr must be page aligned (and there is no align req on size).
i'd expect similar api here.
> +
> + if (size == 16 || size % 16)
> + return -EINVAL;
why %16 and not %8 ?
