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Date: Mon, 29 Jun 2015 14:43:17 -0400
From: "Hon Ching(Vicky) Lo" <honclo@...ux.vnet.ibm.com>
To: Peter Huewe <PeterHuewe@....de>
Cc: Peter Huewe <PeterHuewe@....de>, Ashley Lai <ashley@...leylai.com>,
Vicky Lo <honclo2014@...il.com>, linux-kernel@...r.kernel.org,
Joy Latten <jmlatten@...ux.vnet.ibm.com>
Subject: Re: [PATCH v4 1/2] vTPM: support little endian guests
Hi Peter,
Can you please commit the patch in the next open window, if you
accept it as well?
Thanks,
Vicky
On Thu, 2015-06-18 at 08:23 -0500, Ashley Lai wrote:
Looks better. Thanks.
>
> Reviewed-by: Ashley Lai <ashley@...leylai.com>
>
> Cheers,
> Ashley Lai
>
>
On Wed, 2015-06-17 at 18:17 -0400, Hon Ching(Vicky) Lo wrote:
> This patch makes the code endianness independent. We defined a
> macro do_endian_conversion to apply endianness to raw integers
> in the event entries so that they will be displayed properly.
> tpm_binary_bios_measurements_show() is modified for the display.
>
> Signed-off-by: Hon Ching(Vicky) Lo <honclo@...ux.vnet.ibm.com>
> Signed-off-by: Joy Latten <jmlatten@...ux.vnet.ibm.com>
> ---
> drivers/char/tpm/tpm_eventlog.c | 78 ++++++++++++++++++++++++++++-----------
> drivers/char/tpm/tpm_eventlog.h | 6 +++
> 2 files changed, 62 insertions(+), 22 deletions(-)
>
> diff --git a/drivers/char/tpm/tpm_eventlog.c b/drivers/char/tpm/tpm_eventlog.c
> index 3a56a13..bd72fb0 100644
> --- a/drivers/char/tpm/tpm_eventlog.c
> +++ b/drivers/char/tpm/tpm_eventlog.c
> @@ -76,15 +76,25 @@ static void *tpm_bios_measurements_start(struct seq_file *m, loff_t *pos)
> void *addr = log->bios_event_log;
> void *limit = log->bios_event_log_end;
> struct tcpa_event *event;
> + u32 converted_event_size;
> + u32 converted_event_type;
> +
>
> /* read over *pos measurements */
> for (i = 0; i < *pos; i++) {
> event = addr;
>
> + converted_event_size =
> + do_endian_conversion(event->event_size);
> + converted_event_type =
> + do_endian_conversion(event->event_type);
> +
> if ((addr + sizeof(struct tcpa_event)) < limit) {
> - if (event->event_type == 0 && event->event_size == 0)
> + if ((converted_event_type == 0) &&
> + (converted_event_size == 0))
> return NULL;
> - addr += sizeof(struct tcpa_event) + event->event_size;
> + addr += (sizeof(struct tcpa_event) +
> + converted_event_size);
> }
> }
>
> @@ -94,8 +104,12 @@ static void *tpm_bios_measurements_start(struct seq_file *m, loff_t *pos)
>
> event = addr;
>
> - if ((event->event_type == 0 && event->event_size == 0) ||
> - ((addr + sizeof(struct tcpa_event) + event->event_size) >= limit))
> + converted_event_size = do_endian_conversion(event->event_size);
> + converted_event_type = do_endian_conversion(event->event_type);
> +
> + if (((converted_event_type == 0) && (converted_event_size == 0))
> + || ((addr + sizeof(struct tcpa_event) + converted_event_size)
> + >= limit))
> return NULL;
>
> return addr;
> @@ -107,8 +121,12 @@ static void *tpm_bios_measurements_next(struct seq_file *m, void *v,
> struct tcpa_event *event = v;
> struct tpm_bios_log *log = m->private;
> void *limit = log->bios_event_log_end;
> + u32 converted_event_size;
> + u32 converted_event_type;
>
> - v += sizeof(struct tcpa_event) + event->event_size;
> + converted_event_size = do_endian_conversion(event->event_size);
> +
> + v += sizeof(struct tcpa_event) + converted_event_size;
>
> /* now check if current entry is valid */
> if ((v + sizeof(struct tcpa_event)) >= limit)
> @@ -116,11 +134,11 @@ static void *tpm_bios_measurements_next(struct seq_file *m, void *v,
>
> event = v;
>
> - if (event->event_type == 0 && event->event_size == 0)
> - return NULL;
> + converted_event_size = do_endian_conversion(event->event_size);
> + converted_event_type = do_endian_conversion(event->event_type);
>
> - if ((event->event_type == 0 && event->event_size == 0) ||
> - ((v + sizeof(struct tcpa_event) + event->event_size) >= limit))
> + if (((converted_event_type == 0) && (converted_event_size == 0)) ||
> + ((v + sizeof(struct tcpa_event) + converted_event_size) >= limit))
> return NULL;
>
> (*pos)++;
> @@ -140,7 +158,7 @@ static int get_event_name(char *dest, struct tcpa_event *event,
> int i, n_len = 0, d_len = 0;
> struct tcpa_pc_event *pc_event;
>
> - switch(event->event_type) {
> + switch (do_endian_conversion(event->event_type)) {
> case PREBOOT:
> case POST_CODE:
> case UNUSED:
> @@ -156,14 +174,16 @@ static int get_event_name(char *dest, struct tcpa_event *event,
> case NONHOST_CODE:
> case NONHOST_CONFIG:
> case NONHOST_INFO:
> - name = tcpa_event_type_strings[event->event_type];
> + name = tcpa_event_type_strings[do_endian_conversion
> + (event->event_type)];
> n_len = strlen(name);
> break;
> case SEPARATOR:
> case ACTION:
> - if (MAX_TEXT_EVENT > event->event_size) {
> + if (MAX_TEXT_EVENT >
> + do_endian_conversion(event->event_size)) {
> name = event_entry;
> - n_len = event->event_size;
> + n_len = do_endian_conversion(event->event_size);
> }
> break;
> case EVENT_TAG:
> @@ -171,7 +191,7 @@ static int get_event_name(char *dest, struct tcpa_event *event,
>
> /* ToDo Row data -> Base64 */
>
> - switch (pc_event->event_id) {
> + switch (do_endian_conversion(pc_event->event_id)) {
> case SMBIOS:
> case BIS_CERT:
> case CMOS:
> @@ -179,7 +199,8 @@ static int get_event_name(char *dest, struct tcpa_event *event,
> case OPTION_ROM_EXEC:
> case OPTION_ROM_CONFIG:
> case S_CRTM_VERSION:
> - name = tcpa_pc_event_id_strings[pc_event->event_id];
> + name = tcpa_pc_event_id_strings[do_endian_conversion
> + (pc_event->event_id)];
> n_len = strlen(name);
> break;
> /* hash data */
> @@ -188,7 +209,8 @@ static int get_event_name(char *dest, struct tcpa_event *event,
> case OPTION_ROM_MICROCODE:
> case S_CRTM_CONTENTS:
> case POST_CONTENTS:
> - name = tcpa_pc_event_id_strings[pc_event->event_id];
> + name = tcpa_pc_event_id_strings[do_endian_conversion
> + (pc_event->event_id)];
> n_len = strlen(name);
> for (i = 0; i < 20; i++)
> d_len += sprintf(&data[2*i], "%02x",
> @@ -209,13 +231,24 @@ 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;
> + struct tcpa_event temp_event;
> + char *tempPtr;
> int i;
>
> - for (i = 0; i < sizeof(struct tcpa_event) + event->event_size; i++)
> - seq_putc(m, data[i]);
> + memcpy(&temp_event, event, sizeof(struct tcpa_event));
> +
> + /* convert raw integers for endianness */
> + temp_event.pcr_index = do_endian_conversion(event->pcr_index);
> + temp_event.event_type = do_endian_conversion(event->event_type);
> + temp_event.event_size = do_endian_conversion(event->event_size);
> +
> + tempPtr = (char *)&temp_event;
> +
> + for (i = 0; i < sizeof(struct tcpa_event) + temp_event.event_size; i++)
> + seq_putc(m, tempPtr[i]);
>
> return 0;
> +
> }
>
> static int tpm_bios_measurements_release(struct inode *inode,
> @@ -238,7 +271,7 @@ static int tpm_ascii_bios_measurements_show(struct seq_file *m, void *v)
> char *eventname;
> struct tcpa_event *event = v;
> unsigned char *event_entry =
> - (unsigned char *) (v + sizeof(struct tcpa_event));
> + (unsigned char *)(v + sizeof(struct tcpa_event));
>
> eventname = kmalloc(MAX_TEXT_EVENT, GFP_KERNEL);
> if (!eventname) {
> @@ -247,13 +280,14 @@ static int tpm_ascii_bios_measurements_show(struct seq_file *m, void *v)
> return -EFAULT;
> }
>
> - seq_printf(m, "%2d ", event->pcr_index);
> + /* 1st: PCR */
> + seq_printf(m, "%2d ", do_endian_conversion(event->pcr_index));
>
> /* 2nd: SHA1 */
> seq_printf(m, "%20phN", event->pcr_value);
>
> /* 3rd: event type identifier */
> - seq_printf(m, " %02x", event->event_type);
> + seq_printf(m, " %02x", do_endian_conversion(event->event_type));
>
> len += get_event_name(eventname, event, event_entry);
>
> diff --git a/drivers/char/tpm/tpm_eventlog.h b/drivers/char/tpm/tpm_eventlog.h
> index e7da086..267bfbd 100644
> --- a/drivers/char/tpm/tpm_eventlog.h
> +++ b/drivers/char/tpm/tpm_eventlog.h
> @@ -6,6 +6,12 @@
> #define MAX_TEXT_EVENT 1000 /* Max event string length */
> #define ACPI_TCPA_SIG "TCPA" /* 0x41504354 /'TCPA' */
>
> +#ifdef CONFIG_PPC64
> +#define do_endian_conversion(x) be32_to_cpu(x)
> +#else
> +#define do_endian_conversion(x) x
> +#endif
> +
> enum bios_platform_class {
> BIOS_CLIENT = 0x00,
> BIOS_SERVER = 0x01,
--
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