[PATCH] 1 of 5 IMA: necessary tpm changes

[Kylene Jo Hall]

This patch applies against linux-2.6.12-rc6-mm1 and provides the
internal kernel interface for use by IMA or anything else in the kernel
which would like to use TPM commands.  It also moves the TPM driver up
in the initialization process to accomodate the early initialization
requirements of IMA.

Signed-off-by: Kylene Hall <kjhall@xxxxxxxxxx>
---
--- linux-2.6.12-rc4/drivers/char/tpm/tpm.c.orig	2005-05-17 14:15:53.000000000 -0500
+++ linux-2.6.12-rc4/drivers/char/tpm/tpm.c	2005-05-17 14:18:56.000000000 -0500
@@ -50,15 +50,35 @@ static void user_reader_timeout(unsigned
 }
 
 /*
+ * This function should be used by other kernel subsystems attempting to use the tpm through the tpm_transmit interface.
+ * A call to this function will return the chip structure corresponding to the TPM you are looking for that can then be sent with your command to tpm_transmit.
+ * Passing 0 as the argument corresponds to /dev/tpm0 and thus the first and probably primary TPM on the system.  Passing 1 corresponds to /dev/tpm1 and the next TPM discovered.  If a TPM with the given chip_num does not exist NULL will be returned.  
+ */
+struct tpm_chip* tpm_chip_lookup(int chip_num)
+{
+
+	struct tpm_chip *pos;
+	list_for_each_entry(pos, &tpm_chip_list, list)
+		if (pos->dev_num == chip_num)
+			return pos;
+
+	return NULL;
+
+}
+
+/*
  * Internal kernel interface to transmit TPM commands
  */
-static ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
+ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
 			    size_t bufsiz)
 {
 	ssize_t rc;
 	u32 count;
 	unsigned long stop;
 
+	if ( !chip )
+		return -ENODEV;
+
 	count = be32_to_cpu(*((__be32 *) (buf + 2)));
 
 	if (count == 0)
@@ -110,6 +130,7 @@ out:
 	up(&chip->tpm_mutex);
 	return rc;
 }
+EXPORT_SYMBOL_GPL(tpm_transmit);
 
 #define TPM_DIGEST_SIZE 20
 #define CAP_PCR_RESULT_SIZE 18
--- linux-2.6.12-rc3-ima/drivers/char/tpm/tpm.h	2005-04-20 19:03:13.000000000 -0500
+++ linux-2.6.12-rc3-ima/drivers/char/tpm/tpm.h	2005-05-02 14:08:44.000000000 -0500
@@ -91,3 +91,8 @@ extern ssize_t tpm_read(struct file *, c
 extern void __devexit tpm_remove(struct pci_dev *);
 extern int tpm_pm_suspend(struct pci_dev *, pm_message_t);
 extern int tpm_pm_resume(struct pci_dev *);
+
+/* internal kernel interface */
+extern ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
+			    size_t bufsiz);
+extern struct tpm_chip *tpm_chip_lookup(int chip_num);
--- linux-2.6.12-rc3-ima/drivers/char/tpm/tpm_atmel.c	2005-04-20 19:03:13.000000000 -0500
+++ linux-2.6.12-rc3-ima/drivers/char/tpm/tpm_atmel.c	2005-05-02 14:06:35.000000000 -0500
@@ -207,7 +207,11 @@ static void __exit cleanup_atmel(void)
 	pci_unregister_driver(&atmel_pci_driver);
 }
 
+#ifdef MODULE
 module_init(init_atmel);
+#else
+fs_initcall(init_atmel);
+#endif
 module_exit(cleanup_atmel);
 
 MODULE_AUTHOR("Leendert van Doorn (leendert@xxxxxxxxxxxxxx)");
--- linux-2.6.12-rc3-ima/drivers/char/tpm/tpm_nsc.c	2005-04-20 19:03:13.000000000 -0500
+++ linux-2.6.12-rc3-ima/drivers/char/tpm/tpm_nsc.c	2005-05-02 14:09:34.000000000 -0500
@@ -364,7 +364,11 @@ static void __exit cleanup_nsc(void)
 	pci_unregister_driver(&nsc_pci_driver);
 }
 
+#ifdef MODULE
 module_init(init_nsc);
+#else
+fs_initcall(init_nsc);
+#endif
 module_exit(cleanup_nsc);
 
 MODULE_AUTHOR("Leendert van Doorn (leendert@xxxxxxxxxxxxxx)");



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