From: Dmitry Kasatkin <dmitry.kasatkin@gmail.com>
To: Mimi Zohar <zohar@linux.vnet.ibm.com>
Cc: linux-security-module <linux-security-module@vger.kernel.org>,
"Luis R. Rodriguez" <mcgrof@suse.com>,
kexec@lists.infradead.org, linux-modules@vger.kernel.org,
fsdevel@vger.kernel.org, David Howells <dhowells@redhat.com>,
David Woodhouse <dwmw2@infradead.org>,
Kees Cook <keescook@chromium.org>,
Dmitry Torokhov <dmitry.torokhov@gmail.com>,
Eric Biederman <ebiederm@xmission.com>,
Rusty Russell <rusty@rustcorp.com.au>
Subject: Re: [PATCH v3 21/22] ima: measure and appraise the IMA policy itself
Date: Wed, 10 Feb 2016 22:22:54 +0200 [thread overview]
Message-ID: <CACE9dm9=MRT50JgZeHrLTBVK0W+J6gYgUrzSrfzOGii_r2Ct7A@mail.gmail.com> (raw)
In-Reply-To: <1454526390-19792-22-git-send-email-zohar@linux.vnet.ibm.com>
On Wed, Feb 3, 2016 at 9:06 PM, Mimi Zohar <zohar@linux.vnet.ibm.com> wrote:
> Add support for measuring and appraising the IMA policy itself.
>
> Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Acked-by: Dmitry Kasatkin <dmitry.kasatkin@huawei.com>
But from Documentation/CodingStyle
if (condition)
do_this();
else
do_that();
This does not apply if only one branch of a conditional statement is a single
statement; in the latter case use braces in both branches:
if (condition) {
do_this();
do_that();
} else {
otherwise();
}
You have similar issue in other patches as well...
Dmitry
> ---
> security/integrity/ima/ima.h | 2 ++
> security/integrity/ima/ima_fs.c | 9 ++++++++-
> security/integrity/ima/ima_main.c | 3 +++
> security/integrity/ima/ima_policy.c | 10 +++++++++-
> 4 files changed, 22 insertions(+), 2 deletions(-)
>
> diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
> index 832e62a..6685968 100644
> --- a/security/integrity/ima/ima.h
> +++ b/security/integrity/ima/ima.h
> @@ -149,6 +149,7 @@ enum ima_hooks {
> FIRMWARE_CHECK,
> KEXEC_CHECK,
> INITRAMFS_CHECK,
> + POLICY_CHECK,
> MAX_CHECK
> };
>
> @@ -191,6 +192,7 @@ int ima_policy_show(struct seq_file *m, void *v);
> #define IMA_APPRAISE_LOG 0x04
> #define IMA_APPRAISE_MODULES 0x08
> #define IMA_APPRAISE_FIRMWARE 0x10
> +#define IMA_APPRAISE_POLICY 0x20
>
> #ifdef CONFIG_IMA_APPRAISE
> int ima_appraise_measurement(enum ima_hooks func,
> diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c
> index 00ccd67..7b15e80 100644
> --- a/security/integrity/ima/ima_fs.c
> +++ b/security/integrity/ima/ima_fs.c
> @@ -325,7 +325,14 @@ static ssize_t ima_write_policy(struct file *file, const char __user *buf,
>
> if (data[0] == '/')
> result = ima_read_policy(data);
> - else
> + else if (ima_appraise & IMA_APPRAISE_POLICY) {
> + pr_err("IMA: signed policy required\n");
> + integrity_audit_msg(AUDIT_INTEGRITY_STATUS, NULL, NULL,
> + "policy_update", "signed policy required",
> + 1, 0);
> + if (ima_appraise & IMA_APPRAISE_ENFORCE)
> + result = -EACCES;
> + } else
> result = ima_parse_add_rule(data);
> mutex_unlock(&ima_write_mutex);
> out_free:
> diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
> index ccf9526..497a6f2 100644
> --- a/security/integrity/ima/ima_main.c
> +++ b/security/integrity/ima/ima_main.c
> @@ -386,6 +386,9 @@ int ima_post_read_file(struct file *file, void *buf, loff_t size,
> case READING_KEXEC_INITRAMFS:
> func = INITRAMFS_CHECK;
> break;
> + case READING_POLICY:
> + func = POLICY_CHECK;
> + break;
> default:
> func = FILE_CHECK;
> break;
> diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
> index d02560e..39a811a 100644
> --- a/security/integrity/ima/ima_policy.c
> +++ b/security/integrity/ima/ima_policy.c
> @@ -114,6 +114,7 @@ static struct ima_rule_entry default_measurement_rules[] = {
> .uid = GLOBAL_ROOT_UID, .flags = IMA_FUNC | IMA_INMASK | IMA_UID},
> {.action = MEASURE, .func = MODULE_CHECK, .flags = IMA_FUNC},
> {.action = MEASURE, .func = FIRMWARE_CHECK, .flags = IMA_FUNC},
> + {.action = MEASURE, .func = POLICY_CHECK, .flags = IMA_FUNC},
> };
>
> static struct ima_rule_entry default_appraise_rules[] = {
> @@ -616,6 +617,8 @@ static int ima_parse_rule(char *rule, struct ima_rule_entry *entry)
> entry->func = KEXEC_CHECK;
> else if (strcmp(args[0].from, "INITRAMFS_CHECK") == 0)
> entry->func = INITRAMFS_CHECK;
> + else if (strcmp(args[0].from, "POLICY_CHECK") == 0)
> + entry->func = POLICY_CHECK;
> else
> result = -EINVAL;
> if (!result)
> @@ -774,6 +777,8 @@ static int ima_parse_rule(char *rule, struct ima_rule_entry *entry)
> temp_ima_appraise |= IMA_APPRAISE_MODULES;
> else if (entry->func == FIRMWARE_CHECK)
> temp_ima_appraise |= IMA_APPRAISE_FIRMWARE;
> + else if (entry->func == POLICY_CHECK)
> + temp_ima_appraise |= IMA_APPRAISE_POLICY;
> audit_log_format(ab, "res=%d", !result);
> audit_log_end(ab);
> return result;
> @@ -860,7 +865,7 @@ static char *mask_tokens[] = {
> enum {
> func_file = 0, func_mmap, func_bprm,
> func_module, func_firmware, func_post,
> - func_kexec, func_initramfs
> + func_kexec, func_initramfs, func_policy
> };
>
> static char *func_tokens[] = {
> @@ -940,6 +945,9 @@ static void policy_func_show(struct seq_file *m, enum ima_hooks func)
> case INITRAMFS_CHECK:
> seq_printf(m, pt(Opt_func), ft(func_initramfs));
> break;
> + case POLICY_CHECK:
> + seq_printf(m, pt(Opt_func), ft(func_policy));
> + break;
> default:
> snprintf(tbuf, sizeof(tbuf), "%d", func);
> seq_printf(m, pt(Opt_func), tbuf);
> --
> 2.1.0
>
--
Thanks,
Dmitry
next prev parent reply other threads:[~2016-02-10 20:22 UTC|newest]
Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-03 19:06 [PATCH v3 00/22] vfs: support for a common kernel file loader Mimi Zohar
2016-02-03 19:06 ` [PATCH v3 01/22] ima: separate 'security.ima' reading functionality from collect Mimi Zohar
2016-02-03 19:06 ` [PATCH v3 02/22] ima: refactor ima_policy_show() to display "ima_hooks" rules Mimi Zohar
2016-02-07 19:45 ` Petko Manolov
2016-02-10 19:33 ` Dmitry Kasatkin
2016-02-03 19:06 ` [PATCH v3 03/22] ima: use "ima_hooks" enum as function argument Mimi Zohar
2016-02-07 19:46 ` Petko Manolov
2016-02-10 19:35 ` Dmitry Kasatkin
2016-02-03 19:06 ` [PATCH v3 04/22] firmware: simplify dev_*() print messages for generic helpers Mimi Zohar
2016-02-04 17:26 ` Kees Cook
2016-02-03 19:06 ` [PATCH v3 05/22] firmware: move completing fw into a helper Mimi Zohar
2016-02-04 17:27 ` Kees Cook
2016-02-03 19:06 ` [PATCH v3 06/22] firmware: fold successful fw read early Mimi Zohar
2016-02-04 17:36 ` Kees Cook
2016-02-04 20:26 ` Luis R. Rodriguez
2016-02-03 19:06 ` [PATCH v3 07/22] vfs: define a generic function to read a file from the kernel Mimi Zohar
2016-02-04 17:41 ` Kees Cook
2016-02-03 19:06 ` [PATCH v3 08/22] vfs: define kernel_read_file_id enumeration Mimi Zohar
2016-02-04 17:41 ` Kees Cook
2016-02-04 19:45 ` Luis R. Rodriguez
2016-02-03 19:06 ` [PATCH v3 09/22] ima: provide buffer hash calculation function Mimi Zohar
2016-02-03 19:06 ` [PATCH v3 10/22] ima: calculate the hash of a buffer using aynchronous hash(ahash) Mimi Zohar
2016-02-10 19:58 ` Dmitry Kasatkin
2016-02-03 19:06 ` [PATCH v3 11/22] ima: define a new hook to measure and appraise a file already in memory Mimi Zohar
2016-02-10 20:27 ` Dmitry Kasatkin
2016-02-03 19:06 ` [PATCH v3 12/22] vfs: define kernel_read_file_from_path Mimi Zohar
2016-02-04 17:46 ` Kees Cook
2016-02-04 19:47 ` Luis R. Rodriguez
2016-02-03 19:06 ` [PATCH v3 13/22] firmware: replace call to fw_read_file_contents() with kernel version Mimi Zohar
2016-02-04 17:56 ` Kees Cook
2016-02-04 19:51 ` Luis R. Rodriguez
2016-02-03 19:06 ` [PATCH v3 14/22] security: define kernel_read_file hook Mimi Zohar
2016-02-04 17:57 ` Kees Cook
2016-02-04 19:54 ` Luis R. Rodriguez
2016-02-11 16:54 ` Casey Schaufler
2016-02-11 19:35 ` Mimi Zohar
2016-02-03 19:06 ` [PATCH v3 15/22] vfs: define kernel_copy_file_from_fd() Mimi Zohar
2016-02-04 17:58 ` Kees Cook
2016-02-04 19:55 ` Luis R. Rodriguez
2016-02-03 19:06 ` [PATCH v3 16/22] module: replace copy_module_from_fd with kernel version Mimi Zohar
2016-02-04 18:04 ` Kees Cook
2016-02-04 19:56 ` Luis R. Rodriguez
2016-02-05 0:19 ` Mimi Zohar
2016-02-03 19:06 ` [PATCH v3 17/22] ima: remove firmware and module specific cached status info Mimi Zohar
2016-02-07 19:56 ` Petko Manolov
2016-02-10 20:18 ` Dmitry Kasatkin
2016-02-10 23:14 ` Mimi Zohar
2016-02-03 19:06 ` [PATCH v3 18/22] kexec: replace call to copy_file_from_fd() with kernel version Mimi Zohar
2016-02-04 18:05 ` Kees Cook
2016-02-04 19:57 ` Luis R. Rodriguez
2016-02-12 12:50 ` Dave Young
2016-02-03 19:06 ` [PATCH v3 19/22] ima: support for kexec image and initramfs Mimi Zohar
2016-02-07 20:10 ` Petko Manolov
2016-02-08 23:34 ` Mimi Zohar
2016-02-10 21:09 ` Dmitry Kasatkin
2016-02-10 23:21 ` Mimi Zohar
[not found] ` <CACE9dm8OJ1cgbKszUG-pCiEMVarUFLLWi_jewVV-JEMGAJsA-g@mail.gmail.com>
2016-02-11 2:08 ` Mimi Zohar
2016-02-11 8:47 ` Dmitry Kasatkin
2016-02-11 12:16 ` Mimi Zohar
2016-02-12 12:53 ` Dave Young
2016-02-12 13:09 ` Mimi Zohar
2016-02-03 19:06 ` [PATCH v3 20/22] ima: load policy using path Mimi Zohar
2016-02-07 19:59 ` Petko Manolov
2016-02-08 9:58 ` Dmitry Kasatkin
2016-02-08 10:35 ` Petko Manolov
2016-02-08 10:45 ` Dmitry Kasatkin
2016-02-08 21:12 ` Mimi Zohar
2016-02-09 7:47 ` Petko Manolov
2016-02-03 19:06 ` [PATCH v3 21/22] ima: measure and appraise the IMA policy itself Mimi Zohar
2016-02-07 20:01 ` Petko Manolov
2016-02-10 20:22 ` Dmitry Kasatkin [this message]
2016-02-10 23:15 ` Mimi Zohar
2016-02-03 19:06 ` [PATCH v3 22/22] ima: require signed IMA policy Mimi Zohar
2016-02-07 20:02 ` Petko Manolov
2016-02-10 20:24 ` Dmitry Kasatkin
2016-02-04 18:15 ` [PATCH v3 00/22] vfs: support for a common kernel file loader Kees Cook
2016-02-04 23:54 ` Mimi Zohar
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