On EFI systems, __calc_tpm2_event_size() needs to be able to map tables at early boot time in order to extract information from them. Unfortunately this interacts badly with other architectures that don't provide the early_memremap() interface but which may still have other mechanisms for obtaining crypto-agile logs. Abstract this away so we can avoid the need for two implementations while still avoiding breakage on architectures that don't require remapping of the table.
Signed-off-by: Matthew Garrett <[email protected]> --- drivers/firmware/efi/tpm.c | 3 +++ include/linux/tpm_eventlog.h | 32 ++++++++++++++++++++------------ 2 files changed, 23 insertions(+), 12 deletions(-) diff --git a/drivers/firmware/efi/tpm.c b/drivers/firmware/efi/tpm.c index f2a13cbb8688..fe48150f06d1 100644 --- a/drivers/firmware/efi/tpm.c +++ b/drivers/firmware/efi/tpm.c @@ -4,6 +4,9 @@ * Thiebaud Weksteen <[email protected]> */ +#define TPM_MEMREMAP(start, size) early_memremap(start, size) +#define TPM_MEMUNMAP(start, size) early_memunmap(start, size) + #include <linux/efi.h> #include <linux/init.h> #include <linux/memblock.h> diff --git a/include/linux/tpm_eventlog.h b/include/linux/tpm_eventlog.h index d889e12047d9..0ca27bc053af 100644 --- a/include/linux/tpm_eventlog.h +++ b/include/linux/tpm_eventlog.h @@ -128,6 +128,14 @@ struct tcg_algorithm_info { struct tcg_algorithm_size digest_sizes[]; }; +#ifndef TPM_MEMREMAP +#define TPM_MEMREMAP(start, size) NULL +#endif + +#ifndef TPM_MEMUNMAP +#define TPM_MEMUNMAP(start, size) do{} while(0) +#endif + /** * __calc_tpm2_event_size - calculate the size of a TPM2 event log entry * @event: Pointer to the event whose size should be calculated @@ -171,8 +179,8 @@ static inline int __calc_tpm2_event_size(struct tcg_pcr_event2_head *event, /* Map the event header */ if (do_mapping) { mapping_size = marker - marker_start; - mapping = early_memremap((unsigned long)marker_start, - mapping_size); + mapping = TPM_MEMREMAP((unsigned long)marker_start, + mapping_size); if (!mapping) { size = 0; goto out; @@ -192,10 +200,10 @@ static inline int __calc_tpm2_event_size(struct tcg_pcr_event2_head *event, /* Map the digest's algorithm identifier */ if (do_mapping) { - early_memunmap(mapping, mapping_size); + TPM_MEMUNMAP(mapping, mapping_size); mapping_size = marker - marker_start + halg_size; - mapping = early_memremap((unsigned long)marker_start, - mapping_size); + mapping = TPM_MEMREMAP((unsigned long)marker_start, + mapping_size); if (!mapping) { size = 0; goto out; @@ -212,10 +220,10 @@ static inline int __calc_tpm2_event_size(struct tcg_pcr_event2_head *event, /* Map the digest content itself */ if (do_mapping) { - early_memunmap(mapping, mapping_size); + TPM_MEMUNMAP(mapping, mapping_size); mapping_size = marker - marker_start; - mapping = early_memremap((unsigned long)marker_start, - mapping_size); + mapping = TPM_MEMREMAP((unsigned long)marker_start, + mapping_size); if (!mapping) { size = 0; goto out; @@ -238,10 +246,10 @@ static inline int __calc_tpm2_event_size(struct tcg_pcr_event2_head *event, * we don't need to map it */ if (do_mapping) { - early_memunmap(marker_start, mapping_size); + TPM_MEMUNMAP(marker_start, mapping_size); mapping_size += sizeof(event_field->event_size); - mapping = early_memremap((unsigned long)marker_start, - mapping_size); + mapping = TPM_MEMREMAP((unsigned long)marker_start, + mapping_size); if (!mapping) { size = 0; goto out; @@ -256,7 +264,7 @@ static inline int __calc_tpm2_event_size(struct tcg_pcr_event2_head *event, size = 0; out: if (do_mapping) - early_memunmap(mapping, mapping_size); + TPM_MEMUNMAP(mapping, mapping_size); return size; } -- 2.21.0.392.gf8f6787159e-goog
