Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933248AbcKVLXi (ORCPT ); Tue, 22 Nov 2016 06:23:38 -0500 Received: from mga01.intel.com ([192.55.52.88]:40640 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933003AbcKVLXg (ORCPT ); Tue, 22 Nov 2016 06:23:36 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.31,680,1473145200"; d="scan'208";a="7863862" Date: Tue, 22 Nov 2016 13:23:33 +0200 From: Jarkko Sakkinen To: Nayna Jain Cc: tpmdd-devel@lists.sourceforge.net, peterhuewe@gmx.de, tpmdd@selhorst.net, jgunthorpe@obsidianresearch.com, linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org Subject: Re: [PATCH v6 3/9] tpm: replace dynamically allocated bios_dir with a static array Message-ID: <20161122112333.7ootyrbssd6pkrjb@intel.com> References: <1479117656-12403-1-git-send-email-nayna@linux.vnet.ibm.com> <1479117656-12403-4-git-send-email-nayna@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1479117656-12403-4-git-send-email-nayna@linux.vnet.ibm.com> Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo User-Agent: Mutt/1.6.2-neo (2016-08-21) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5608 Lines: 188 On Mon, Nov 14, 2016 at 05:00:50AM -0500, Nayna Jain wrote: > 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 This commit remains unreviewed and tested. I'm in the author role here so I cannot help with this. If that does not happen soon I cannot put this into the pull request. /Jarkko > --- > 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 >