diff options
Diffstat (limited to 'lib/libtpm/tcgbios.c')
| -rw-r--r-- | lib/libtpm/tcgbios.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/lib/libtpm/tcgbios.c b/lib/libtpm/tcgbios.c index 6f553a7..ee052e1 100644 --- a/lib/libtpm/tcgbios.c +++ b/lib/libtpm/tcgbios.c @@ -33,6 +33,7 @@ #include "helpers.h" #include "version.h" #include "OF.h" +#include "libelf.h" #undef TCGBIOS_DEBUG //#define TCGBIOS_DEBUG @@ -888,6 +889,49 @@ static uint32_t tpm_add_measurement_to_log(uint32_t pcrindex, } /* + * Measure the contents of a buffer into the given PCR and log it with the + * given eventtype. If is_elf is true, try to determine the size of the + * ELF file in the buffer and use its size rather than the much larger data + * buffer it is held in. In case of failure to detect the ELF file size, + * log an error. + * + * Input parameters: + * @pcrindex : PCR to extend + * @eventtype : type of event + * @data: the buffer to measure + * @datalen: length of the buffer + * @desc: The description to log + * @desclen: The length of the description + * @is_elf: Whether data buffer holds an ELF file and we should determine + * the original file size. + * + * Returns 0 on success, an error code otherwise. + */ +uint32_t tpm_hash_log_extend_event_buffer(uint32_t pcrindex, uint32_t eventtype, + const void *data, uint64_t datalen, + const char *desc, uint32_t desclen, + bool is_elf) +{ + long len; + char buf[256]; + + if (is_elf) { + len = elf_get_file_size(data, datalen); + if (len > 0) { + datalen = len; + } else { + snprintf(buf, sizeof(buf), "BAD ELF FILE: %s", desc); + return tpm_add_measurement_to_log(pcrindex, eventtype, + buf, strlen(buf), + (uint8_t *)buf, strlen(buf)); + } + } + return tpm_add_measurement_to_log(pcrindex, eventtype, + desc, desclen, + data, datalen); +} + +/* * Add an EV_ACTION measurement to the list of measurements */ static uint32_t tpm_add_action(uint32_t pcrIndex, const char *string) |