Meld a common function for opening measurements files and keep the
dentries in a static array.
Jarkko Sakkinen (1):
tpm: replace dynamically allocated bios_dir with a static array
Nayna Jain (1):
tpm: define a generic open() method for ascii & bios measurements
drivers/char/tpm/tpm-chip.c | 9 +--
drivers/char/tpm/tpm.h | 3 +-
drivers/char/tpm/tpm_eventlog.c | 123 ++++++++++++++--------------------------
drivers/char/tpm/tpm_eventlog.h | 10 ++--
4 files changed, 55 insertions(+), 90 deletions(-)
--
2.7.4
This commit is based on a commit by Nayna Jain. Replaced dynamically
allocated bios_dir with a static array as the size is always constant.
Suggested-by: Jason Gunthorpe <[email protected]>
Signed-off-by: Nayna Jain <[email protected]>
Signed-off-by: Jarkko Sakkinen <[email protected]>
---
drivers/char/tpm/tpm-chip.c | 9 +++---
drivers/char/tpm/tpm.h | 3 +-
drivers/char/tpm/tpm_eventlog.c | 62 +++++++++++++++++++----------------------
drivers/char/tpm/tpm_eventlog.h | 10 +++----
4 files changed, 41 insertions(+), 43 deletions(-)
diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
index e595013..a56b609 100644
--- a/drivers/char/tpm/tpm-chip.c
+++ b/drivers/char/tpm/tpm-chip.c
@@ -278,14 +278,16 @@ static void tpm_del_char_device(struct tpm_chip *chip)
static int tpm1_chip_register(struct tpm_chip *chip)
{
+ int rc;
+
if (chip->flags & TPM_CHIP_FLAG_TPM2)
return 0;
tpm_sysfs_add_device(chip);
- chip->bios_dir = tpm_bios_log_setup(dev_name(&chip->dev));
+ rc = tpm_bios_log_setup(chip);
- return 0;
+ return rc;
}
static void tpm1_chip_unregister(struct tpm_chip *chip)
@@ -293,8 +295,7 @@ static void tpm1_chip_unregister(struct tpm_chip *chip)
if (chip->flags & TPM_CHIP_FLAG_TPM2)
return;
- if (chip->bios_dir)
- tpm_bios_log_teardown(chip->bios_dir);
+ tpm_bios_log_teardown(chip);
}
static void tpm_del_legacy_sysfs(struct tpm_chip *chip)
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index 4d183c9..c8ce0df 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -40,6 +40,7 @@ enum tpm_const {
TPM_BUFSIZE = 4096,
TPM_NUM_DEVICES = 65536,
TPM_RETRY = 50, /* 5 seconds */
+ TPM_NUM_EVENT_LOG_FILES = 3,
};
enum tpm_timeout {
@@ -171,7 +172,7 @@ struct tpm_chip {
unsigned long duration[3]; /* jiffies */
bool duration_adjusted;
- struct dentry **bios_dir;
+ struct dentry *bios_dir[TPM_EVENT_LOG_FILES];
const struct attribute_group *groups[3];
unsigned int groups_cnt;
diff --git a/drivers/char/tpm/tpm_eventlog.c b/drivers/char/tpm/tpm_eventlog.c
index 75e6644..5138956 100644
--- a/drivers/char/tpm/tpm_eventlog.c
+++ b/drivers/char/tpm/tpm_eventlog.c
@@ -368,54 +368,50 @@ static int is_bad(void *p)
return 0;
}
-struct dentry **tpm_bios_log_setup(const char *name)
+int tpm_bios_log_setup(struct tpm_chip *chip)
{
- struct dentry **ret = NULL, *tpm_dir, *bin_file, *ascii_file;
+ const char *name = dev_name(&chip->dev);
+ unsigned int cnt;
- tpm_dir = securityfs_create_dir(name, NULL);
- if (is_bad(tpm_dir))
- goto out;
+ cnt = 0;
+ chip->bios_dir[cnt] =
+ securityfs_create_dir(name, NULL);
+ if (is_bad(chip->bios_dir[cnt]))
+ goto err;
+ cnt++;
- bin_file =
+ chip->bios_dir[cnt] =
securityfs_create_file("binary_bios_measurements",
- S_IRUSR | S_IRGRP, tpm_dir,
+ S_IRUSR | S_IRGRP, chip->bios_dir[cnt],
(void *)&tpm_binary_b_measurments_seqops,
&tpm_bios_measurements_ops);
- if (is_bad(bin_file))
- goto out_tpm;
+ if (is_bad(chip->bios_dir[cnt]))
+ goto err;
+ cnt++;
- ascii_file =
+ chip->bios_dir[cnt] =
securityfs_create_file("ascii_bios_measurements",
- S_IRUSR | S_IRGRP, tpm_dir,
+ S_IRUSR | S_IRGRP, chip->bios_dir[cnt],
(void *)&tpm_ascii_b_measurments_seqops,
&tpm_bios_measurements_ops);
- if (is_bad(ascii_file))
- goto out_bin;
+ if (is_bad(chip->bios_dir[cnt]))
+ goto err;
+ cnt++;
- ret = kmalloc(3 * sizeof(struct dentry *), GFP_KERNEL);
- if (!ret)
- goto out_ascii;
-
- ret[0] = ascii_file;
- ret[1] = bin_file;
- ret[2] = tpm_dir;
-
- return ret;
+ return 0;
-out_ascii:
- securityfs_remove(ascii_file);
-out_bin:
- securityfs_remove(bin_file);
-out_tpm:
- securityfs_remove(tpm_dir);
-out:
- return NULL;
+err:
+ chip->bios_dir[cnt] = NULL;
+ tpm_bios_log_teardown(chip);
+ return -EIO;
}
-void tpm_bios_log_teardown(struct dentry **lst)
+void tpm_bios_log_teardown(struct tpm_chip *chip)
{
int i;
- for (i = 0; i < 3; i++)
- securityfs_remove(lst[i]);
+ for (i = (TPM_NUM_EVENT_LOG_FILES - 1); i >= 0; i--) {
+ if (chip->bios_dir[i])
+ securityfs_remove(chip->bios_dir[i]);
+ }
}
diff --git a/drivers/char/tpm/tpm_eventlog.h b/drivers/char/tpm/tpm_eventlog.h
index 8de62b0..fd3357e 100644
--- a/drivers/char/tpm/tpm_eventlog.h
+++ b/drivers/char/tpm/tpm_eventlog.h
@@ -77,14 +77,14 @@ int read_log(struct tpm_bios_log *log);
#if defined(CONFIG_TCG_IBMVTPM) || defined(CONFIG_TCG_IBMVTPM_MODULE) || \
defined(CONFIG_ACPI)
-extern struct dentry **tpm_bios_log_setup(const char *);
-extern void tpm_bios_log_teardown(struct dentry **);
+extern int tpm_bios_log_setup(struct tpm_chip *chip);
+extern void tpm_bios_log_teardown(struct tpm_chip *chip);
#else
-static inline struct dentry **tpm_bios_log_setup(const char *name)
+static inline int tpm_bios_log_setup(struct tpm_chip *chip)
{
- return NULL;
+ return 0;
}
-static inline void tpm_bios_log_teardown(struct dentry **dir)
+static inline void tpm_bios_log_teardown(struct tpm_chip *chip)
{
}
#endif
--
2.7.4
From: Nayna Jain <[email protected]>
open() method for event log ascii and binary bios measurements file
operations are very similar. This patch refactors the code into a
single open() call by passing seq_operations as i_node->private data.
Suggested-by: Jason Gunthorpe <[email protected]>
Signed-off-by: Nayna Jain <[email protected]>
Reviewed-by: Jarkko Sakkinen <[email protected]>
Reviewed-by: Jason Gunthorpe <[email protected]>
---
drivers/char/tpm/tpm_eventlog.c | 59 +++++++++--------------------------------
1 file changed, 13 insertions(+), 46 deletions(-)
diff --git a/drivers/char/tpm/tpm_eventlog.c b/drivers/char/tpm/tpm_eventlog.c
index e722886..75e6644 100644
--- a/drivers/char/tpm/tpm_eventlog.c
+++ b/drivers/char/tpm/tpm_eventlog.c
@@ -7,6 +7,7 @@
* Stefan Berger <[email protected]>
* Reiner Sailer <[email protected]>
* Kylene Hall <[email protected]>
+ * Nayna Jain <[email protected]>
*
* Maintained by: <[email protected]>
*
@@ -318,12 +319,14 @@ static const struct seq_operations tpm_binary_b_measurments_seqops = {
.show = tpm_binary_bios_measurements_show,
};
-static int tpm_ascii_bios_measurements_open(struct inode *inode,
+static int tpm_bios_measurements_open(struct inode *inode,
struct file *file)
{
int err;
struct tpm_bios_log *log;
struct seq_file *seq;
+ const struct seq_operations *seqops =
+ (const struct seq_operations *)inode->i_private;
log = kzalloc(sizeof(struct tpm_bios_log), GFP_KERNEL);
if (!log)
@@ -333,7 +336,7 @@ static int tpm_ascii_bios_measurements_open(struct inode *inode,
goto out_free;
/* now register seq file */
- err = seq_open(file, &tpm_ascii_b_measurments_seqops);
+ err = seq_open(file, seqops);
if (!err) {
seq = file->private_data;
seq->private = log;
@@ -349,46 +352,8 @@ out_free:
goto out;
}
-static const struct file_operations tpm_ascii_bios_measurements_ops = {
- .open = tpm_ascii_bios_measurements_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = tpm_bios_measurements_release,
-};
-
-static int tpm_binary_bios_measurements_open(struct inode *inode,
- struct file *file)
-{
- int err;
- struct tpm_bios_log *log;
- struct seq_file *seq;
-
- log = kzalloc(sizeof(struct tpm_bios_log), GFP_KERNEL);
- if (!log)
- return -ENOMEM;
-
- if ((err = read_log(log)))
- goto out_free;
-
- /* now register seq file */
- err = seq_open(file, &tpm_binary_b_measurments_seqops);
- if (!err) {
- seq = file->private_data;
- seq->private = log;
- } else {
- goto out_free;
- }
-
-out:
- return err;
-out_free:
- kfree(log->bios_event_log);
- kfree(log);
- goto out;
-}
-
-static const struct file_operations tpm_binary_bios_measurements_ops = {
- .open = tpm_binary_bios_measurements_open,
+static const struct file_operations tpm_bios_measurements_ops = {
+ .open = tpm_bios_measurements_open,
.read = seq_read,
.llseek = seq_lseek,
.release = tpm_bios_measurements_release,
@@ -413,15 +378,17 @@ struct dentry **tpm_bios_log_setup(const char *name)
bin_file =
securityfs_create_file("binary_bios_measurements",
- S_IRUSR | S_IRGRP, tpm_dir, NULL,
- &tpm_binary_bios_measurements_ops);
+ S_IRUSR | S_IRGRP, tpm_dir,
+ (void *)&tpm_binary_b_measurments_seqops,
+ &tpm_bios_measurements_ops);
if (is_bad(bin_file))
goto out_tpm;
ascii_file =
securityfs_create_file("ascii_bios_measurements",
- S_IRUSR | S_IRGRP, tpm_dir, NULL,
- &tpm_ascii_bios_measurements_ops);
+ S_IRUSR | S_IRGRP, tpm_dir,
+ (void *)&tpm_ascii_b_measurments_seqops,
+ &tpm_bios_measurements_ops);
if (is_bad(ascii_file))
goto out_bin;
--
2.7.4
Please ignore this version. I was going to do a '--dry-run'. Sorry :(
Doing resend later on once I've tested the changes.
/Jarkko
On Sat, Oct 01, 2016 at 03:41:15PM +0300, Jarkko Sakkinen wrote:
> Meld a common function for opening measurements files and keep the
> dentries in a static array.
>
> Jarkko Sakkinen (1):
> tpm: replace dynamically allocated bios_dir with a static array
>
> Nayna Jain (1):
> tpm: define a generic open() method for ascii & bios measurements
>
> drivers/char/tpm/tpm-chip.c | 9 +--
> drivers/char/tpm/tpm.h | 3 +-
> drivers/char/tpm/tpm_eventlog.c | 123 ++++++++++++++--------------------------
> drivers/char/tpm/tpm_eventlog.h | 10 ++--
> 4 files changed, 55 insertions(+), 90 deletions(-)
>
> --
> 2.7.4
>
On Sat, Oct 01, 2016 at 03:41:17PM +0300, Jarkko Sakkinen wrote:
> - bin_file =
> + chip->bios_dir[cnt] =
> securityfs_create_file("binary_bios_measurements",
> - S_IRUSR | S_IRGRP, tpm_dir,
> + S_IRUSR | S_IRGRP, chip->bios_dir[cnt],
That is certainly not right, Nayna's version was correct, the function
argument is the directory to create under and bios_dir[0] is setup as the
directory for tpm. This is also why removal is done in reverse order,
files are removed then the directory that contains them.
Jason
On Sat, Oct 01, 2016 at 10:49:32AM -0600, Jason Gunthorpe wrote:
> On Sat, Oct 01, 2016 at 03:41:17PM +0300, Jarkko Sakkinen wrote:
> > - bin_file =
> > + chip->bios_dir[cnt] =
> > securityfs_create_file("binary_bios_measurements",
> > - S_IRUSR | S_IRGRP, tpm_dir,
> > + S_IRUSR | S_IRGRP, chip->bios_dir[cnt],
>
> That is certainly not right, Nayna's version was correct, the function
> argument is the directory to create under and bios_dir[0] is setup as the
> directory for tpm. This is also why removal is done in reverse order,
> files are removed then the directory that contains them.
Right. I overlooked this.
> Jason
/Jarkko