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[PATCH] tpm: more bios log parsing fixes

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From: Seiji Munetoh <seiji.munetoh@gmail.com>

Change 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>
Acked-by: Kylene Hall <kjhall@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Seiji Munetoh 2006-05-30 21:25:52 -07:00 committed by Linus Torvalds
parent de66a695be
commit 44d7aff035
1 changed files with 4 additions and 44 deletions
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48
drivers/char/tpm/tpm_bios.c
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@ -284,53 +284,13 @@ static int get_event_name(char *dest, struct tcpa_event *event,
static int tpm_binary_bios_measurements_show(struct seq_file *m, void *v)
{
struct tcpa_event *event = v;
char *data = v;
int i;
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++)
for (i = 0; i < sizeof(struct tcpa_event) + event->event_size; i++)
seq_putc(m, data[i]);
/* 2nd: SHA1 (20 bytes) */
for (i = 0; i < 20; i++)
seq_putc(m, event->pcr_value[i]);
/* 3rd: event type identifier (4 bytes) */
help = le32_to_cpu(event->event_type);
memcpy(data, &help, 4);
for (i = 0; i < 4; 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;
}