Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933759AbcKNKDP (ORCPT ); Mon, 14 Nov 2016 05:03:15 -0500 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:47259 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S932310AbcKNKBZ (ORCPT ); Mon, 14 Nov 2016 05:01:25 -0500 From: Nayna Jain To: tpmdd-devel@lists.sourceforge.net Cc: peterhuewe@gmx.de, tpmdd@selhorst.net, jarkko.sakkinen@linux.intel.com, jgunthorpe@obsidianresearch.com, linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org, Nayna Jain Subject: [PATCH v6 3/9] tpm: replace dynamically allocated bios_dir with a static array Date: Mon, 14 Nov 2016 05:00:50 -0500 X-Mailer: git-send-email 2.5.0 In-Reply-To: <1479117656-12403-1-git-send-email-nayna@linux.vnet.ibm.com> References: <1479117656-12403-1-git-send-email-nayna@linux.vnet.ibm.com> X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 16111410-0048-0000-0000-000001DA41A1 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 16111410-0049-0000-0000-000046F71333 Message-Id: <1479117656-12403-4-git-send-email-nayna@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2016-11-14_03:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=1 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1609300000 definitions=main-1611140206 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5008 Lines: 178 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 Signed-off-by: Nayna Jain Signed-off-by: Jarkko Sakkinen --- drivers/char/tpm/tpm-chip.c | 9 ++++--- drivers/char/tpm/tpm.h | 3 ++- drivers/char/tpm/tpm_eventlog.c | 59 ++++++++++++++++++----------------------- drivers/char/tpm/tpm_eventlog.h | 10 +++---- 4 files changed, 38 insertions(+), 43 deletions(-) diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c index 836f056..d0c1872 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 f9401ca..9d69580 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_NUM_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 9467e31..62e9da6 100644 --- a/drivers/char/tpm/tpm_eventlog.c +++ b/drivers/char/tpm/tpm_eventlog.c @@ -368,54 +368,47 @@ 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", - 0440, tpm_dir, + 0440, chip->bios_dir[0], (void *)&tpm_binary_b_measurements_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", - 0440, tpm_dir, + 0440, chip->bios_dir[0], (void *)&tpm_ascii_b_measurements_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--) + 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 -- 2.5.0