linux-kernel - Re: [PATCH 09/23] x86, kaiser: map dynamically-allocated LDTs

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Date:   Thu, 23 Nov 2017 11:42:10 -0800
From:   Eric Biggers <ebiggers3@...il.com>
To:     Dave Hansen <dave.hansen@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        moritz.lipp@...k.tugraz.at, daniel.gruss@...k.tugraz.at,
        michael.schwarz@...k.tugraz.at, richard.fellner@...dent.tugraz.at,
        luto@...nel.org, torvalds@...ux-foundation.org,
        keescook@...gle.com, hughd@...gle.com, x86@...nel.org
Subject: Re: [PATCH 09/23] x86, kaiser: map dynamically-allocated LDTs

> diff -puN arch/x86/kernel/ldt.c~kaiser-user-map-new-ldts arch/x86/kernel/ldt.c
> --- a/arch/x86/kernel/ldt.c~kaiser-user-map-new-ldts	2017-11-22 15:45:49.059619739 -0800
> +++ b/arch/x86/kernel/ldt.c	2017-11-22 15:45:49.062619739 -0800
> @@ -11,6 +11,7 @@
[...]
> +	ret = kaiser_add_mapping((unsigned long)new_ldt->entries, alloc_size,
> +				 __PAGE_KERNEL | _PAGE_GLOBAL);
> +	if (ret) {
> +		__free_ldt_struct(new_ldt);
> +		return NULL;
> +	}
>  	new_ldt->nr_entries = num_entries;
>  	return new_ldt;

__free_ldt_struct() uses new_ldt->nr_entries, so new_ldt->nr_entries needs to be
set earlier.

Eric