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Re: [PATCH v5 2/4] hvmloader: fix SMBIOS table length checks
- To: Petr Beneš <w1benny@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 27 Aug 2025 10:33:27 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 27 Aug 2025 08:33:40 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 24.08.2025 00:26, Petr Beneš wrote:
> From: Petr Beneš <w1benny@xxxxxxxxx>
>
> SMBIOS specification dictates that tables should have a minimal length.
> This commit introduces further validation for user-input SMBIOS tables.
>
> As per SMBIOS Reference Specification:
> * Type 0: For version 2.3 and later implementations, the length is at least
> 14h
> * Type 1: 1Bh for 2.4 and later
> * Type 2: at least 08h
> * Type 3: 0Dh for version 2.1 and later
> * Type 11: 5h (+ strings)
> * Type 22: 1Ah (+ strings)
> * Type 39: a minimum of 10h
>
> Notably, this also fixes previously incorrect check for chassis handle in
> smbios_type_2_init. Chassis handle is a WORD, therefore, the condition now
> correctly checks for >= 13 instead of > 13.
>
> hvmloader currently implements version 2.4
>
> Furthermore, this commit introduces smbios_pt_copy helper function to
> substitute
> previously repeating pattern of locating the struct in physical memory (via
> get_smbios_pt_struct), checking the length and copying it into SMBIOS region.
I've added
Fixes: 4d23036e7096 ("HVM firmware passthrough SMBIOS processing")
here.
Jan
> Signed-off-by: Petr Beneš <w1benny@xxxxxxxxx>
> Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
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