From: Kylene Jo Hall Date: Sun, 8 Jan 2006 09:03:48 +0000 (-0800) Subject: [PATCH] tpmdd: remove global event log X-Git-Tag: v2.6.16-rc1~738 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d09cf7d77f62f6fb2f6d63fe5980583805f2d559;p=linux-2.6 [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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/drivers/char/tpm/tpm_bios.c b/drivers/char/tpm/tpm_bios.c index 5e1f4dfefa..aedf7a8e6d 100644 --- a/drivers/char/tpm/tpm_bios.c +++ b/drivers/char/tpm/tpm_bios.c @@ -29,6 +29,11 @@ #define MAX_TEXT_EVENT 1000 /* Max event string length */ #define ACPI_TCPA_SIG "TCPA" /* 0x41504354 /'TCPA' */ +struct tpm_bios_log { + void *bios_event_log; + void *bios_event_log_end; +}; + struct acpi_tcpa { struct acpi_table_header hdr; u16 reserved; @@ -117,39 +122,34 @@ static const char* tcpa_pc_event_id_strings[] = { "S-CRTM POST Contents", }; -/* (Binary) bios measurement buffer */ -static void *tcg_eventlog; -static void *tcg_eventlog_addr_limit; /* MAX */ - /* returns pointer to start of pos. entry of tcg log */ static void *tpm_bios_measurements_start(struct seq_file *m, loff_t *pos) { loff_t i; - void *addr = tcg_eventlog; + struct tpm_bios_log *log = m->private; + void *addr = log->bios_event_log; + void *limit = log->bios_event_log_end; struct tcpa_event *event; /* read over *pos measurements */ for (i = 0; i < *pos; i++) { event = addr; - if ((addr + sizeof(struct tcpa_event)) < - tcg_eventlog_addr_limit) { + if ((addr + sizeof(struct tcpa_event)) < limit) { if (event->event_type == 0 && event->event_size == 0) return NULL; - addr += - sizeof(struct tcpa_event) + event->event_size; + addr += sizeof(struct tcpa_event) + event->event_size; } } /* now check if current entry is valid */ - if ((addr + sizeof(struct tcpa_event)) >= tcg_eventlog_addr_limit) + if ((addr + sizeof(struct tcpa_event)) >= limit) return NULL; event = addr; if ((event->event_type == 0 && event->event_size == 0) || - ((addr + sizeof(struct tcpa_event) + event->event_size) >= - tcg_eventlog_addr_limit)) + ((addr + sizeof(struct tcpa_event) + event->event_size) >= limit)) return NULL; return addr; @@ -159,11 +159,13 @@ static void *tpm_bios_measurements_next(struct seq_file *m, void *v, loff_t *pos) { struct tcpa_event *event = v; + struct tpm_bios_log *log = m->private; + void *limit = log->bios_event_log_end; v += sizeof(struct tcpa_event) + event->event_size; /* now check if current entry is valid */ - if ((v + sizeof(struct tcpa_event)) >= tcg_eventlog_addr_limit) + if ((v + sizeof(struct tcpa_event)) >= limit) return NULL; event = v; @@ -172,8 +174,7 @@ static void *tpm_bios_measurements_next(struct seq_file *m, void *v, return NULL; if ((event->event_type == 0 && event->event_size == 0) || - ((v + sizeof(struct tcpa_event) + event->event_size) >= - tcg_eventlog_addr_limit)) + ((v + sizeof(struct tcpa_event) + event->event_size) >= limit)) return NULL; (*pos)++; @@ -312,10 +313,14 @@ static int tpm_binary_bios_measurements_show(struct seq_file *m, void *v) static int tpm_bios_measurements_release(struct inode *inode, struct file *file) { - if (tcg_eventlog) { - kfree(tcg_eventlog); - tcg_eventlog = NULL; + struct seq_file *seq = file->private_data; + struct tpm_bios_log *log = seq->private; + + if (log) { + kfree(log->bios_event_log); + kfree(log); } + return seq_release(inode, file); } @@ -367,13 +372,13 @@ static struct seq_operations tpm_binary_b_measurments_seqops = { }; /* read binary bios log */ -static int read_log(void) +static int read_log(struct tpm_bios_log *log) { struct acpi_tcpa *buff; acpi_status status; void *virt; - if (tcg_eventlog != NULL) { + if (log->bios_event_log != NULL) { printk(KERN_ERR "%s: ERROR - Eventlog already initialized\n", __func__); @@ -393,25 +398,24 @@ static int read_log(void) } if (buff->log_max_len == 0) { - printk(KERN_ERR "%s: ERROR - TCPA log area empty\n", - __func__); + printk(KERN_ERR "%s: ERROR - TCPA log area empty\n", __func__); return -EIO; } /* malloc EventLog space */ - tcg_eventlog = kmalloc(buff->log_max_len, GFP_KERNEL); - if (!tcg_eventlog) { + log->bios_event_log = kmalloc(buff->log_max_len, GFP_KERNEL); + if (!log->bios_event_log) { printk ("%s: ERROR - Not enough Memory for BIOS measurements\n", __func__); return -ENOMEM; } - tcg_eventlog_addr_limit = tcg_eventlog + buff->log_max_len; + log->bios_event_log_end = log->bios_event_log + buff->log_max_len; acpi_os_map_memory(buff->log_start_addr, buff->log_max_len, &virt); - memcpy(tcg_eventlog, virt, buff->log_max_len); + memcpy(log->bios_event_log, virt, buff->log_max_len); acpi_os_unmap_memory(virt, buff->log_max_len); return 0; @@ -421,12 +425,26 @@ static int tpm_ascii_bios_measurements_open(struct inode *inode, struct file *file) { int err; + struct tpm_bios_log *log; + struct seq_file *seq; - if ((err = read_log())) + log = kzalloc(sizeof(struct tpm_bios_log), GFP_KERNEL); + if (!log) + return -ENOMEM; + + if ((err = read_log(log))) return err; /* now register seq file */ - return seq_open(file, &tpm_ascii_b_measurments_seqops); + err = seq_open(file, &tpm_ascii_b_measurments_seqops); + if (!err) { + seq = file->private_data; + seq->private = log; + } else { + kfree(log->bios_event_log); + kfree(log); + } + return err; } struct file_operations tpm_ascii_bios_measurements_ops = { @@ -440,12 +458,26 @@ static int tpm_binary_bios_measurements_open(struct inode *inode, struct file *file) { int err; + struct tpm_bios_log *log; + struct seq_file *seq; - if ((err = read_log())) + log = kzalloc(sizeof(struct tpm_bios_log), GFP_KERNEL); + if (!log) + return -ENOMEM; + + if ((err = read_log(log))) return err; /* now register seq file */ - return seq_open(file, &tpm_binary_b_measurments_seqops); + err = seq_open(file, &tpm_binary_b_measurments_seqops); + if (!err) { + seq = file->private_data; + seq->private = log; + } else { + kfree(log->bios_event_log); + kfree(log); + } + return err; } struct file_operations tpm_binary_bios_measurements_ops = {