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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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[PATCH] tpmdd: remove global event log
Remove global event log in the tpm bios event measurement log code that would have caused problems when the code was run concurrently. A log is now allocated and attached to the seq file upon open and destroyed appropriately. Signed-off-by: Kylene Jo 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:
Kylene Jo Hall
Linus Torvalds
parent
5e38291d80
commit
d09cf7d77f
@ -29,6 +29,11 @@
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#define MAX_TEXT_EVENT 1000 /* Max event string length */
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#define ACPI_TCPA_SIG "TCPA" /* 0x41504354 /'TCPA' */
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struct tpm_bios_log {
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void *bios_event_log;
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void *bios_event_log_end;
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};
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struct acpi_tcpa {
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struct acpi_table_header hdr;
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u16 reserved;
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@ -117,39 +122,34 @@ static const char* tcpa_pc_event_id_strings[] = {
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"S-CRTM POST Contents",
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};
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/* (Binary) bios measurement buffer */
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static void *tcg_eventlog;
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static void *tcg_eventlog_addr_limit; /* MAX */
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/* returns pointer to start of pos. entry of tcg log */
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static void *tpm_bios_measurements_start(struct seq_file *m, loff_t *pos)
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{
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loff_t i;
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void *addr = tcg_eventlog;
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struct tpm_bios_log *log = m->private;
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void *addr = log->bios_event_log;
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void *limit = log->bios_event_log_end;
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struct tcpa_event *event;
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/* read over *pos measurements */
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for (i = 0; i < *pos; i++) {
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event = addr;
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if ((addr + sizeof(struct tcpa_event)) <
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tcg_eventlog_addr_limit) {
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if ((addr + sizeof(struct tcpa_event)) < limit) {
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if (event->event_type == 0 && event->event_size == 0)
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return NULL;
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addr +=
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sizeof(struct tcpa_event) + event->event_size;
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addr += sizeof(struct tcpa_event) + event->event_size;
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}
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}
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/* now check if current entry is valid */
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if ((addr + sizeof(struct tcpa_event)) >= tcg_eventlog_addr_limit)
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if ((addr + sizeof(struct tcpa_event)) >= limit)
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return NULL;
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event = addr;
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if ((event->event_type == 0 && event->event_size == 0) ||
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((addr + sizeof(struct tcpa_event) + event->event_size) >=
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tcg_eventlog_addr_limit))
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((addr + sizeof(struct tcpa_event) + event->event_size) >= limit))
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return NULL;
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return addr;
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@ -159,11 +159,13 @@ static void *tpm_bios_measurements_next(struct seq_file *m, void *v,
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loff_t *pos)
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{
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struct tcpa_event *event = v;
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struct tpm_bios_log *log = m->private;
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void *limit = log->bios_event_log_end;
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v += sizeof(struct tcpa_event) + event->event_size;
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/* now check if current entry is valid */
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if ((v + sizeof(struct tcpa_event)) >= tcg_eventlog_addr_limit)
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if ((v + sizeof(struct tcpa_event)) >= limit)
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return NULL;
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event = v;
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@ -172,8 +174,7 @@ static void *tpm_bios_measurements_next(struct seq_file *m, void *v,
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return NULL;
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if ((event->event_type == 0 && event->event_size == 0) ||
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((v + sizeof(struct tcpa_event) + event->event_size) >=
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tcg_eventlog_addr_limit))
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((v + sizeof(struct tcpa_event) + event->event_size) >= limit))
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return NULL;
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(*pos)++;
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@ -312,10 +313,14 @@ static int tpm_binary_bios_measurements_show(struct seq_file *m, void *v)
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static int tpm_bios_measurements_release(struct inode *inode,
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struct file *file)
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{
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if (tcg_eventlog) {
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kfree(tcg_eventlog);
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tcg_eventlog = NULL;
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struct seq_file *seq = file->private_data;
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struct tpm_bios_log *log = seq->private;
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if (log) {
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kfree(log->bios_event_log);
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kfree(log);
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}
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return seq_release(inode, file);
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}
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@ -367,13 +372,13 @@ static struct seq_operations tpm_binary_b_measurments_seqops = {
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};
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/* read binary bios log */
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static int read_log(void)
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static int read_log(struct tpm_bios_log *log)
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{
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struct acpi_tcpa *buff;
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acpi_status status;
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void *virt;
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if (tcg_eventlog != NULL) {
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if (log->bios_event_log != NULL) {
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printk(KERN_ERR
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"%s: ERROR - Eventlog already initialized\n",
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__func__);
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@ -393,25 +398,24 @@ static int read_log(void)
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}
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if (buff->log_max_len == 0) {
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printk(KERN_ERR "%s: ERROR - TCPA log area empty\n",
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__func__);
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printk(KERN_ERR "%s: ERROR - TCPA log area empty\n", __func__);
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return -EIO;
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}
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/* malloc EventLog space */
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tcg_eventlog = kmalloc(buff->log_max_len, GFP_KERNEL);
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if (!tcg_eventlog) {
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log->bios_event_log = kmalloc(buff->log_max_len, GFP_KERNEL);
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if (!log->bios_event_log) {
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printk
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("%s: ERROR - Not enough Memory for BIOS measurements\n",
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__func__);
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return -ENOMEM;
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}
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tcg_eventlog_addr_limit = tcg_eventlog + buff->log_max_len;
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log->bios_event_log_end = log->bios_event_log + buff->log_max_len;
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acpi_os_map_memory(buff->log_start_addr, buff->log_max_len, &virt);
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memcpy(tcg_eventlog, virt, buff->log_max_len);
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memcpy(log->bios_event_log, virt, buff->log_max_len);
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acpi_os_unmap_memory(virt, buff->log_max_len);
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return 0;
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@ -421,12 +425,26 @@ static int tpm_ascii_bios_measurements_open(struct inode *inode,
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struct file *file)
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{
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int err;
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struct tpm_bios_log *log;
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struct seq_file *seq;
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if ((err = read_log()))
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log = kzalloc(sizeof(struct tpm_bios_log), GFP_KERNEL);
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if (!log)
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return -ENOMEM;
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if ((err = read_log(log)))
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return err;
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/* now register seq file */
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return seq_open(file, &tpm_ascii_b_measurments_seqops);
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err = seq_open(file, &tpm_ascii_b_measurments_seqops);
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if (!err) {
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seq = file->private_data;
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seq->private = log;
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} else {
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kfree(log->bios_event_log);
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kfree(log);
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}
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return err;
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}
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struct file_operations tpm_ascii_bios_measurements_ops = {
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@ -440,12 +458,26 @@ static int tpm_binary_bios_measurements_open(struct inode *inode,
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struct file *file)
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{
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int err;
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struct tpm_bios_log *log;
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struct seq_file *seq;
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if ((err = read_log()))
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log = kzalloc(sizeof(struct tpm_bios_log), GFP_KERNEL);
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if (!log)
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return -ENOMEM;
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if ((err = read_log(log)))
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return err;
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/* now register seq file */
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return seq_open(file, &tpm_binary_b_measurments_seqops);
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err = seq_open(file, &tpm_binary_b_measurments_seqops);
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if (!err) {
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seq = file->private_data;
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seq->private = log;
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} else {
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kfree(log->bios_event_log);
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kfree(log);
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}
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return err;
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}
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struct file_operations tpm_binary_bios_measurements_ops = {
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