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 <[email protected]>
---
--- 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;
}
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
