Merge branch 'next-tpm' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security

Pull tpm updates from James Morris:

 - Clean up the transmission flow

   Cleaned up the whole transmission flow. Locking of the chip is now
   done in the level of tpm_try_get_ops() and tpm_put_ops() instead
   taking the chip lock inside tpm_transmit(). The nested calls inside
   tpm_transmit(), used with the resource manager, have been refactored
   out.

   Should make easier to perform more complex transactions with the TPM
   without making the subsystem a bigger mess (e.g. encrypted channel
   patches by James Bottomley).

 - PPI 1.3 support

   TPM PPI 1.3 introduces an additional optional command parameter that
   may be needed for some commands. Display the parameter if the command
   requires such a parameter. Only command 23 (SetPCRBanks) needs one.

   The PPI request file will show output like this then:

      # echo "23 16" > request
      # cat request
      23 16

      # echo "5" > request
      # cat request
      5

 - Extend all PCR banks in IMA

   Instead of static PCR banks array, the array of available PCR banks
   is now allocated dynamically. The digests sizes are determined
   dynamically using a probe PCR read without relying crypto's static
   list of hash algorithms.

   This should finally make sealing of measurements in IMA safe and
   secure.

 - TPM 2.0 selftests

   Added a test suite to tools/testing/selftests/tpm2 previously outside
   of the kernel tree: https://github.com/jsakkine-intel/tpm2-scripts

* 'next-tpm' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security: (37 commits)
  tpm/ppi: Enable submission of optional command parameter for PPI 1.3
  tpm/ppi: Possibly show command parameter if TPM PPI 1.3 is used
  tpm/ppi: Display up to 101 operations as define for version 1.3
  tpm/ppi: rename TPM_PPI_REVISION_ID to TPM_PPI_REVISION_ID_1
  tpm/ppi: pass function revision ID to tpm_eval_dsm()
  tpm: pass an array of tpm_extend_digest structures to tpm_pcr_extend()
  KEYS: trusted: explicitly use tpm_chip structure from tpm_default_chip()
  tpm: move tpm_chip definition to include/linux/tpm.h
  tpm: retrieve digest size of unknown algorithms with PCR read
  tpm: rename and export tpm2_digest and tpm2_algorithms
  tpm: dynamically allocate the allocated_banks array
  tpm: remove @flags from tpm_transmit()
  tpm: take TPM chip power gating out of tpm_transmit()
  tpm: introduce tpm_chip_start() and tpm_chip_stop()
  tpm: remove TPM_TRANSMIT_UNLOCKED flag
  tpm: use tpm_try_get_ops() in tpm-sysfs.c.
  tpm: remove @space from tpm_transmit()
  tpm: move TPM space code out of tpm_transmit()
  tpm: move tpm_validate_commmand() to tpm2-space.c
  tpm: clean up tpm_try_transmit() error handling flow
  ...

2 files changed, 129 insertions, 19 deletions

diff --git a/include/linux/tpm.h b/include/linux/tpm.h
index b49a55cf775f..1b5436b213a2 100644
--- a/include/linux/tpm.h
+++ b/include/linux/tpm.h
@@ -22,12 +22,41 @@
 #ifndef __LINUX_TPM_H__
 #define __LINUX_TPM_H__
 
+#include <linux/hw_random.h>
+#include <linux/acpi.h>
+#include <linux/cdev.h>
+#include <linux/fs.h>
+#include <crypto/hash_info.h>
+
 #define TPM_DIGEST_SIZE 20	/* Max TPM v1.2 PCR size */
+#define TPM_MAX_DIGEST_SIZE SHA512_DIGEST_SIZE
 
 struct tpm_chip;
 struct trusted_key_payload;
 struct trusted_key_options;
 
+enum tpm_algorithms {
+	TPM_ALG_ERROR		= 0x0000,
+	TPM_ALG_SHA1		= 0x0004,
+	TPM_ALG_KEYEDHASH	= 0x0008,
+	TPM_ALG_SHA256		= 0x000B,
+	TPM_ALG_SHA384		= 0x000C,
+	TPM_ALG_SHA512		= 0x000D,
+	TPM_ALG_NULL		= 0x0010,
+	TPM_ALG_SM3_256		= 0x0012,
+};
+
+struct tpm_digest {
+	u16 alg_id;
+	u8 digest[TPM_MAX_DIGEST_SIZE];
+} __packed;
+
+struct tpm_bank_info {
+	u16 alg_id;
+	u16 digest_size;
+	u16 crypto_id;
+};
+
 enum TPM_OPS_FLAGS {
 	TPM_OPS_AUTO_STARTUP = BIT(0),
 };
@@ -41,7 +70,7 @@ struct tpm_class_ops {
 	int (*send) (struct tpm_chip *chip, u8 *buf, size_t len);
 	void (*cancel) (struct tpm_chip *chip);
 	u8 (*status) (struct tpm_chip *chip);
-	bool (*update_timeouts)(struct tpm_chip *chip,
+	void (*update_timeouts)(struct tpm_chip *chip,
 				unsigned long *timeout_cap);
 	int (*go_idle)(struct tpm_chip *chip);
 	int (*cmd_ready)(struct tpm_chip *chip);
@@ -50,11 +79,100 @@ struct tpm_class_ops {
 	void (*clk_enable)(struct tpm_chip *chip, bool value);
 };
 
+#define TPM_NUM_EVENT_LOG_FILES		3
+
+/* Indexes the duration array */
+enum tpm_duration {
+	TPM_SHORT = 0,
+	TPM_MEDIUM = 1,
+	TPM_LONG = 2,
+	TPM_LONG_LONG = 3,
+	TPM_UNDEFINED,
+	TPM_NUM_DURATIONS = TPM_UNDEFINED,
+};
+
+#define TPM_PPI_VERSION_LEN		3
+
+struct tpm_space {
+	u32 context_tbl[3];
+	u8 *context_buf;
+	u32 session_tbl[3];
+	u8 *session_buf;
+};
+
+struct tpm_bios_log {
+	void *bios_event_log;
+	void *bios_event_log_end;
+};
+
+struct tpm_chip_seqops {
+	struct tpm_chip *chip;
+	const struct seq_operations *seqops;
+};
+
+struct tpm_chip {
+	struct device dev;
+	struct device devs;
+	struct cdev cdev;
+	struct cdev cdevs;
+
+	/* A driver callback under ops cannot be run unless ops_sem is held
+	 * (sometimes implicitly, eg for the sysfs code). ops becomes null
+	 * when the driver is unregistered, see tpm_try_get_ops.
+	 */
+	struct rw_semaphore ops_sem;
+	const struct tpm_class_ops *ops;
+
+	struct tpm_bios_log log;
+	struct tpm_chip_seqops bin_log_seqops;
+	struct tpm_chip_seqops ascii_log_seqops;
+
+	unsigned int flags;
+
+	int dev_num;		/* /dev/tpm# */
+	unsigned long is_open;	/* only one allowed */
+
+	char hwrng_name[64];
+	struct hwrng hwrng;
+
+	struct mutex tpm_mutex;	/* tpm is processing */
+
+	unsigned long timeout_a; /* jiffies */
+	unsigned long timeout_b; /* jiffies */
+	unsigned long timeout_c; /* jiffies */
+	unsigned long timeout_d; /* jiffies */
+	bool timeout_adjusted;
+	unsigned long duration[TPM_NUM_DURATIONS]; /* jiffies */
+	bool duration_adjusted;
+
+	struct dentry *bios_dir[TPM_NUM_EVENT_LOG_FILES];
+
+	const struct attribute_group *groups[3];
+	unsigned int groups_cnt;
+
+	u32 nr_allocated_banks;
+	struct tpm_bank_info *allocated_banks;
+#ifdef CONFIG_ACPI
+	acpi_handle acpi_dev_handle;
+	char ppi_version[TPM_PPI_VERSION_LEN + 1];
+#endif /* CONFIG_ACPI */
+
+	struct tpm_space work_space;
+	u32 last_cc;
+	u32 nr_commands;
+	u32 *cc_attrs_tbl;
+
+	/* active locality */
+	int locality;
+};
+
 #if defined(CONFIG_TCG_TPM) || defined(CONFIG_TCG_TPM_MODULE)
 
 extern int tpm_is_tpm2(struct tpm_chip *chip);
-extern int tpm_pcr_read(struct tpm_chip *chip, u32 pcr_idx, u8 *res_buf);
-extern int tpm_pcr_extend(struct tpm_chip *chip, u32 pcr_idx, const u8 *hash);
+extern int tpm_pcr_read(struct tpm_chip *chip, u32 pcr_idx,
+			struct tpm_digest *digest);
+extern int tpm_pcr_extend(struct tpm_chip *chip, u32 pcr_idx,
+			  struct tpm_digest *digests);
 extern int tpm_send(struct tpm_chip *chip, void *cmd, size_t buflen);
 extern int tpm_get_random(struct tpm_chip *chip, u8 *data, size_t max);
 extern int tpm_seal_trusted(struct tpm_chip *chip,
@@ -70,13 +188,14 @@ static inline int tpm_is_tpm2(struct tpm_chip *chip)
 	return -ENODEV;
 }
 
-static inline int tpm_pcr_read(struct tpm_chip *chip, u32 pcr_idx, u8 *res_buf)
+static inline int tpm_pcr_read(struct tpm_chip *chip, int pcr_idx,
+			       struct tpm_digest *digest)
 {
 	return -ENODEV;
 }
 
 static inline int tpm_pcr_extend(struct tpm_chip *chip, u32 pcr_idx,
-				 const u8 *hash)
+				 struct tpm_digest *digests)
 {
 	return -ENODEV;
 }
diff --git a/include/linux/tpm_eventlog.h b/include/linux/tpm_eventlog.h
index 20d9da77fc11..81519f163211 100644
--- a/include/linux/tpm_eventlog.h
+++ b/include/linux/tpm_eventlog.h
@@ -3,12 +3,11 @@
 #ifndef __LINUX_TPM_EVENTLOG_H__
 #define __LINUX_TPM_EVENTLOG_H__
 
-#include <crypto/hash_info.h>
+#include <linux/tpm.h>
 
 #define TCG_EVENT_NAME_LEN_MAX	255
 #define MAX_TEXT_EVENT		1000	/* Max event string length */
 #define ACPI_TCPA_SIG		"TCPA"	/* 0x41504354 /'TCPA' */
-#define TPM2_ACTIVE_PCR_BANKS	3
 
 #define EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2 0x1
 #define EFI_TCG2_EVENT_LOG_FORMAT_TCG_2   0x2
@@ -82,7 +81,7 @@ struct tcg_efi_specid_event_algs {
 	u16 digest_size;
 } __packed;
 
-struct tcg_efi_specid_event {
+struct tcg_efi_specid_event_head {
 	u8 signature[16];
 	u32 platform_class;
 	u8 spec_version_minor;
@@ -90,9 +89,7 @@ struct tcg_efi_specid_event {
 	u8 spec_errata;
 	u8 uintnsize;
 	u32 num_algs;
-	struct tcg_efi_specid_event_algs digest_sizes[TPM2_ACTIVE_PCR_BANKS];
-	u8 vendor_info_size;
-	u8 vendor_info[0];
+	struct tcg_efi_specid_event_algs digest_sizes[];
 } __packed;
 
 struct tcg_pcr_event {
@@ -108,17 +105,11 @@ struct tcg_event_field {
 	u8 event[0];
 } __packed;
 
-struct tpm2_digest {
-	u16 alg_id;
-	u8 digest[SHA512_DIGEST_SIZE];
-} __packed;
-
-struct tcg_pcr_event2 {
+struct tcg_pcr_event2_head {
 	u32 pcr_idx;
 	u32 event_type;
 	u32 count;
-	struct tpm2_digest digests[TPM2_ACTIVE_PCR_BANKS];
-	struct tcg_event_field event;
+	struct tpm_digest digests[];
 } __packed;
 
 #endif