Messages in this thread | | | Subject | Re: [PATCH 2/2] tpm: bios log parsing fixes | From | Kylene Jo Hall <> | Date | Fri, 26 May 2006 09:43:59 -0500 |
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Ack'ed-by: Kylene Hall <kjhall@us.ibm.com>
On Fri, 2006-05-26 at 23:43 +0900, Seiji Munetoh wrote: > This patch changes the binary output format to actual ACPI TCPA log > structure since the current format does not contain all event-data > information that need to verify the PCRs in TPM. > tpm_binary_bios_measurements_show() uses get_event_name() to convert the > binary event-data to ascii format, and puts them as binary. However, to > verify the PCRs, the event-data must be a actual binary event-data used > by SHA1 calc. in BIOS. > > So, I think actual ACPI TCPA log is good for this binary output format. > That way, any userland tools easily parse this data with reference to > TCG PC specification. > > Signed-off-by: Seiji Munetoh <seiji.munetoh@gmail.com> > --- > > --- linux-2.6.17-rc4/drivers/char/tpm/tpm_bios.c 2006-05-16 > 09:33:06.000000000 +0900 > +++ linux-2.6.17-rc4-tpm/drivers/char/tpm/tpm_bios.c 2006-05-24 > 07:11:44.000000000 +0900 > @@ -275,53 +284,13 @@ static int get_event_name(char *dest, st > > static int tpm_binary_bios_measurements_show(struct seq_file *m, void > *v) > { > - > - char *eventname; > - char data[4]; > - u32 help; > - int i, len; > struct tcpa_event *event = (struct tcpa_event *) v; > - unsigned char *event_entry = > - (unsigned char *) (v + sizeof(struct tcpa_event)); > - > - eventname = kmalloc(MAX_TEXT_EVENT, GFP_KERNEL); > - if (!eventname) { > - printk(KERN_ERR "%s: ERROR - No Memory for event name\n ", > - __func__); > - return -ENOMEM; > - } > - > - /* 1st: PCR used is in little-endian format (4 bytes) */ > - help = le32_to_cpu(event->pcr_index); > - memcpy(data, &help, 4); > - for (i = 0; i < 4; i++) > - seq_putc(m, data[i]); > - > - /* 2nd: SHA1 (20 bytes) */ > - for (i = 0; i < 20; i++) > - seq_putc(m, event->pcr_value[i]); > + char *data = (char *) v; > + int i; > > - /* 3rd: event type identifier (4 bytes) */ > - help = le32_to_cpu(event->event_type); > - memcpy(data, &help, 4); > - for (i = 0; i < 4; i++) > + for (i = 0;i < sizeof(struct tcpa_event) + event->event_size; i++) > seq_putc(m, data[i]); > > - len = 0; > - > - len += get_event_name(eventname, event, event_entry); > - > - /* 4th: filename <= 255 + \'0' delimiter */ > - if (len > TCG_EVENT_NAME_LEN_MAX) > - len = TCG_EVENT_NAME_LEN_MAX; > - > - for (i = 0; i < len; i++) > - seq_putc(m, eventname[i]); > - > - /* 5th: delimiter */ > - seq_putc(m, '\0'); > - > - kfree(eventname); > return 0; > } > > > >
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