Re: [PATCH v3 1/2] hw/i386: Improve bounds checking in OVMF table parsing

[Daniel P . Berrangé]

On Tue, Feb 22, 2022 at 07:19:05AM +0000, Dov Murik wrote:
> When pc_system_parse_ovmf_flash() parses the optional GUIDed table in
> the end of the OVMF flash memory area, the table length field is checked
> for sizes that are too small, but doesn't error on sizes that are too
> big (bigger than the flash content itself).
> 
> Add a check for maximal size of the OVMF table, and add an error report
> in case the size is invalid.  In such a case, an error like this will be
> displayed during launch:
> 
>     qemu-system-x86_64: OVMF table has invalid size 4047
> 
> and the table parsing is skipped.
> 
> Signed-off-by: Dov Murik <dovmurik@linux.ibm.com>
> ---
>  hw/i386/pc_sysfw_ovmf.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>


Regards,
Daniel
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