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authorMimi Zohar <zohar@linux.vnet.ibm.com>2012-10-16 12:40:08 +1030
committerRusty Russell <rusty@rustcorp.com.au>2012-12-14 13:05:26 +1030
commitfdf90729e57812cb12d7938e2dee7c71e875fb08 (patch)
tree0ec17c765406dedc37ac278823d50587d53d1525
parent1625cee56f8e6193b5a0809a414dfa395bd9cf1e (diff)
downloadlinux-linaro-stable-fdf90729e57812cb12d7938e2dee7c71e875fb08.tar.gz
ima: support new kernel module syscall
With the addition of the new kernel module syscall, which defines two arguments - a file descriptor to the kernel module and a pointer to a NULL terminated string of module arguments - it is now possible to measure and appraise kernel modules like any other file on the file system. This patch adds support to measure and appraise kernel modules in an extensible and consistent manner. To support filesystems without extended attribute support, additional patches could pass the signature as the first parameter. Signed-off-by: Mimi Zohar <zohar@us.ibm.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
-rw-r--r--Documentation/ABI/testing/ima_policy3
-rw-r--r--include/linux/ima.h6
-rw-r--r--security/integrity/ima/ima.h2
-rw-r--r--security/integrity/ima/ima_api.c4
-rw-r--r--security/integrity/ima/ima_main.c21
-rw-r--r--security/integrity/ima/ima_policy.c3
-rw-r--r--security/security.c7
7 files changed, 41 insertions, 5 deletions
diff --git a/Documentation/ABI/testing/ima_policy b/Documentation/ABI/testing/ima_policy
index 986946613542..ec0a38ef3145 100644
--- a/Documentation/ABI/testing/ima_policy
+++ b/Documentation/ABI/testing/ima_policy
@@ -23,7 +23,7 @@ Description:
lsm: [[subj_user=] [subj_role=] [subj_type=]
[obj_user=] [obj_role=] [obj_type=]]
- base: func:= [BPRM_CHECK][FILE_MMAP][FILE_CHECK]
+ base: func:= [BPRM_CHECK][FILE_MMAP][FILE_CHECK][MODULE_CHECK]
mask:= [MAY_READ] [MAY_WRITE] [MAY_APPEND] [MAY_EXEC]
fsmagic:= hex value
uid:= decimal value
@@ -53,6 +53,7 @@ Description:
measure func=BPRM_CHECK
measure func=FILE_MMAP mask=MAY_EXEC
measure func=FILE_CHECK mask=MAY_READ uid=0
+ measure func=MODULE_CHECK uid=0
appraise fowner=0
The default policy measures all executables in bprm_check,
diff --git a/include/linux/ima.h b/include/linux/ima.h
index 2c7223d7e73b..86c361e947b9 100644
--- a/include/linux/ima.h
+++ b/include/linux/ima.h
@@ -18,6 +18,7 @@ extern int ima_bprm_check(struct linux_binprm *bprm);
extern int ima_file_check(struct file *file, int mask);
extern void ima_file_free(struct file *file);
extern int ima_file_mmap(struct file *file, unsigned long prot);
+extern int ima_module_check(struct file *file);
#else
static inline int ima_bprm_check(struct linux_binprm *bprm)
@@ -40,6 +41,11 @@ static inline int ima_file_mmap(struct file *file, unsigned long prot)
return 0;
}
+static inline int ima_module_check(struct file *file)
+{
+ return 0;
+}
+
#endif /* CONFIG_IMA_H */
#ifdef CONFIG_IMA_APPRAISE
diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index 6ee8826662cc..3b2adb794f15 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -127,7 +127,7 @@ struct integrity_iint_cache *integrity_iint_insert(struct inode *inode);
struct integrity_iint_cache *integrity_iint_find(struct inode *inode);
/* IMA policy related functions */
-enum ima_hooks { FILE_CHECK = 1, FILE_MMAP, BPRM_CHECK, POST_SETATTR };
+enum ima_hooks { FILE_CHECK = 1, FILE_MMAP, BPRM_CHECK, MODULE_CHECK, POST_SETATTR };
int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask,
int flags);
diff --git a/security/integrity/ima/ima_api.c b/security/integrity/ima/ima_api.c
index b356884fb3ef..0cea3db21657 100644
--- a/security/integrity/ima/ima_api.c
+++ b/security/integrity/ima/ima_api.c
@@ -100,12 +100,12 @@ err_out:
* ima_get_action - appraise & measure decision based on policy.
* @inode: pointer to inode to measure
* @mask: contains the permission mask (MAY_READ, MAY_WRITE, MAY_EXECUTE)
- * @function: calling function (FILE_CHECK, BPRM_CHECK, FILE_MMAP)
+ * @function: calling function (FILE_CHECK, BPRM_CHECK, FILE_MMAP, MODULE_CHECK)
*
* The policy is defined in terms of keypairs:
* subj=, obj=, type=, func=, mask=, fsmagic=
* subj,obj, and type: are LSM specific.
- * func: FILE_CHECK | BPRM_CHECK | FILE_MMAP
+ * func: FILE_CHECK | BPRM_CHECK | FILE_MMAP | MODULE_CHECK
* mask: contains the permission mask
* fsmagic: hex value
*
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index 73c9a268253e..45de18e9a6f2 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -280,6 +280,27 @@ int ima_file_check(struct file *file, int mask)
}
EXPORT_SYMBOL_GPL(ima_file_check);
+/**
+ * ima_module_check - based on policy, collect/store/appraise measurement.
+ * @file: pointer to the file to be measured/appraised
+ *
+ * Measure/appraise kernel modules based on policy.
+ *
+ * Always return 0 and audit dentry_open failures.
+ * Return code is based upon measurement appraisal.
+ */
+int ima_module_check(struct file *file)
+{
+ int rc;
+
+ if (!file)
+ rc = INTEGRITY_UNKNOWN;
+ else
+ rc = process_measurement(file, file->f_dentry->d_name.name,
+ MAY_EXEC, MODULE_CHECK);
+ return (ima_appraise & IMA_APPRAISE_ENFORCE) ? rc : 0;
+}
+
static int __init init_ima(void)
{
int error;
diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index c7dacd2eab7a..af7d182d5a46 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -80,6 +80,7 @@ static struct ima_rule_entry default_rules[] = {
.flags = IMA_FUNC | IMA_MASK},
{.action = MEASURE,.func = FILE_CHECK,.mask = MAY_READ,.uid = GLOBAL_ROOT_UID,
.flags = IMA_FUNC | IMA_MASK | IMA_UID},
+ {.action = MEASURE,.func = MODULE_CHECK, .flags = IMA_FUNC},
};
static struct ima_rule_entry default_appraise_rules[] = {
@@ -401,6 +402,8 @@ static int ima_parse_rule(char *rule, struct ima_rule_entry *entry)
/* PATH_CHECK is for backwards compat */
else if (strcmp(args[0].from, "PATH_CHECK") == 0)
entry->func = FILE_CHECK;
+ else if (strcmp(args[0].from, "MODULE_CHECK") == 0)
+ entry->func = MODULE_CHECK;
else if (strcmp(args[0].from, "FILE_MMAP") == 0)
entry->func = FILE_MMAP;
else if (strcmp(args[0].from, "BPRM_CHECK") == 0)
diff --git a/security/security.c b/security/security.c
index ce88630de15d..daa97f4ac9d1 100644
--- a/security/security.c
+++ b/security/security.c
@@ -822,7 +822,12 @@ int security_kernel_module_request(char *kmod_name)
int security_kernel_module_from_file(struct file *file)
{
- return security_ops->kernel_module_from_file(file);
+ int ret;
+
+ ret = security_ops->kernel_module_from_file(file);
+ if (ret)
+ return ret;
+ return ima_module_check(file);
}
int security_task_fix_setuid(struct cred *new, const struct cred *old,