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Re: [Xen-devel] [PATCH v5] x86/xpti: Don't leak TSS-adjacent percpu data via Meltdown
- To: Jan Beulich <jbeulich@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Mon, 12 Aug 2019 11:29:21 +0100
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- Cc: Kevin Tian <kevin.tian@xxxxxxxxx>, Jun Nakajima <jun.nakajima@xxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Mon, 12 Aug 2019 10:29:29 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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On 12/08/2019 08:23, Jan Beulich wrote:
> @@ -747,16 +747,10 @@ void load_system_tables(void)
> .bitmap = IOBMP_INVALID_OFFSET,
> };
>
> - _set_tssldt_desc(
> - gdt + TSS_ENTRY,
> - (unsigned long)tss,
> - offsetof(struct tss_struct, __cacheline_filler) - 1,
> - SYS_DESC_tss_avail);
> - _set_tssldt_desc(
> - compat_gdt + TSS_ENTRY,
> - (unsigned long)tss,
> - offsetof(struct tss_struct, __cacheline_filler) - 1,
> - SYS_DESC_tss_busy);
> + _set_tssldt_desc(gdt + TSS_ENTRY, (unsigned long)tss,
> + sizeof(*tss) - 1, SYS_DESC_tss_avail);
> + _set_tssldt_desc(compat_gdt + TSS_ENTRY, (unsigned long)tss,
> + sizeof(*tss) - 1, SYS_DESC_tss_busy);
Do you think it is worth having a BUILD_BUG_ON(sizeof(*tss) < 0x67),
just to confirm that the load wont fault?
Everything else LGTM.
~Andrew
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