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image: Add an option to do a full check of the FIT
Some strange modifications of the FIT can introduce security risks. Add an option to check it thoroughly, using libfdt's fdt_check_full() function. Enable this by default if signature verification is enabled. CVE-2021-27097 Signed-off-by: Simon Glass <sjg@chromium.org> Reported-by: Bruce Monroe <bruce.monroe@intel.com> Reported-by: Arie Haenel <arie.haenel@intel.com> Reported-by: Julien Lenoir <julien.lenoir@intel.com>
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