967a76bd81
This patch introduces support signing and verification of firmware slots using CBFS metadata hash verification method for faster initial verification. To have complete verification, CBFS_VERIFICATION should also be enabled, as metadata hash covers only files metadata, not their contents. This patch also adapts mainboards and SoCs to new vboot reset requirements. TEST=Google Volteer/Voxel boots with VBOOT_CBFS_INTEGRATION enabled Signed-off-by: Jakub Czapiga <jacz@semihalf.com> Change-Id: I40ae01c477c4e4f7a1c90e4026a8a868ae64b5ca Reviewed-on: https://review.coreboot.org/c/coreboot/+/66909 Reviewed-by: Yu-Ping Wu <yupingso@google.com> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
48 lines
1.8 KiB
C
48 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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#ifndef _CBFS_GLUE_H_
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#define _CBFS_GLUE_H_
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#include <commonlib/region.h>
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#include <console/console.h>
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#include <security/vboot/misc.h>
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/*
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* This flag prevents linking hashing functions into stages where they're not required. We don't
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* need them at all if verification is disabled. If verification is enabled without TOCTOU
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* safety, we only need to verify the metadata hash in the initial stage and can assume it stays
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* valid in later stages. If TOCTOU safety is required, we may need them in every stage to
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* reverify metadata that had to be reloaded from flash (e.g. because it didn't fit the mcache).
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* Moreover, if VBOOT_CBFS_INTEGRATION and verification are both enabled, then hashing functions
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* are required during verification stage.
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* Note that this only concerns metadata hashing -- file access functions may still link hashing
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* routines independently for file data hashing.
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*/
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#define CBFS_ENABLE_HASHING (CONFIG(CBFS_VERIFICATION) && \
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(CONFIG(TOCTOU_SAFETY) || ENV_INITIAL_STAGE || \
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(CONFIG(VBOOT_CBFS_INTEGRATION) && \
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(verification_should_run() || \
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(verstage_should_load() && \
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CONFIG(VBOOT_RETURN_FROM_VERSTAGE))))))
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#define CBFS_HASH_HWCRYPTO vboot_hwcrypto_allowed()
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#define ERROR(...) printk(BIOS_ERR, "CBFS ERROR: " __VA_ARGS__)
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#define LOG(...) printk(BIOS_INFO, "CBFS: " __VA_ARGS__)
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#define DEBUG(...) do { \
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if (CONFIG(DEBUG_CBFS)) \
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printk(BIOS_SPEW, "CBFS DEBUG: " __VA_ARGS__); \
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} while (0)
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typedef const struct region_device *cbfs_dev_t;
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static inline ssize_t cbfs_dev_read(cbfs_dev_t dev, void *buffer, size_t offset, size_t size)
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{
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return rdev_readat(dev, buffer, offset, size);
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}
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static inline size_t cbfs_dev_size(cbfs_dev_t dev)
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{
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return region_device_sz(dev);
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}
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#endif /* _CBFS_GLUE_H_ */
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