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-rw-r--r--include/linux/lsm_audit.h18
-rw-r--r--include/linux/security.h7
-rw-r--r--kernel/kmod.c8
-rw-r--r--security/capability.c2
-rw-r--r--security/lsm_audit.c4
-rw-r--r--security/security.c4
-rw-r--r--security/selinux/hooks.c13
7 files changed, 36 insertions, 20 deletions
diff --git a/include/linux/lsm_audit.h b/include/linux/lsm_audit.h
index 190c378..f78f83d 100644
--- a/include/linux/lsm_audit.h
+++ b/include/linux/lsm_audit.h
@@ -26,14 +26,15 @@
/* Auxiliary data to use in generating the audit record. */
struct common_audit_data {
- char type;
-#define LSM_AUDIT_DATA_FS 1
-#define LSM_AUDIT_DATA_NET 2
-#define LSM_AUDIT_DATA_CAP 3
-#define LSM_AUDIT_DATA_IPC 4
-#define LSM_AUDIT_DATA_TASK 5
-#define LSM_AUDIT_DATA_KEY 6
-#define LSM_AUDIT_NO_AUDIT 7
+ char type;
+#define LSM_AUDIT_DATA_FS 1
+#define LSM_AUDIT_DATA_NET 2
+#define LSM_AUDIT_DATA_CAP 3
+#define LSM_AUDIT_DATA_IPC 4
+#define LSM_AUDIT_DATA_TASK 5
+#define LSM_AUDIT_DATA_KEY 6
+#define LSM_AUDIT_NO_AUDIT 7
+#define LSM_AUDIT_DATA_KMOD 8
struct task_struct *tsk;
union {
struct {
@@ -66,6 +67,7 @@ struct common_audit_data {
char *key_desc;
} key_struct;
#endif
+ char *kmod_name;
} u;
/* this union contains LSM specific data */
union {
diff --git a/include/linux/security.h b/include/linux/security.h
index ed0faea..466cbad 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -706,6 +706,7 @@ static inline void security_free_mnt_opts(struct security_mnt_opts *opts)
* @kernel_module_request:
* Ability to trigger the kernel to automatically upcall to userspace for
* userspace to load a kernel module with the given name.
+ * @kmod_name name of the module requested by the kernel
* Return 0 if successful.
* @task_setuid:
* Check permission before setting one or more of the user identity
@@ -1577,7 +1578,7 @@ struct security_operations {
void (*cred_transfer)(struct cred *new, const struct cred *old);
int (*kernel_act_as)(struct cred *new, u32 secid);
int (*kernel_create_files_as)(struct cred *new, struct inode *inode);
- int (*kernel_module_request)(void);
+ int (*kernel_module_request)(char *kmod_name);
int (*task_setuid) (uid_t id0, uid_t id1, uid_t id2, int flags);
int (*task_fix_setuid) (struct cred *new, const struct cred *old,
int flags);
@@ -1842,7 +1843,7 @@ void security_commit_creds(struct cred *new, const struct cred *old);
void security_transfer_creds(struct cred *new, const struct cred *old);
int security_kernel_act_as(struct cred *new, u32 secid);
int security_kernel_create_files_as(struct cred *new, struct inode *inode);
-int security_kernel_module_request(void);
+int security_kernel_module_request(char *kmod_name);
int security_task_setuid(uid_t id0, uid_t id1, uid_t id2, int flags);
int security_task_fix_setuid(struct cred *new, const struct cred *old,
int flags);
@@ -2407,7 +2408,7 @@ static inline int security_kernel_create_files_as(struct cred *cred,
return 0;
}
-static inline int security_kernel_module_request(void)
+static inline int security_kernel_module_request(char *kmod_name)
{
return 0;
}
diff --git a/kernel/kmod.c b/kernel/kmod.c
index 9fcb53a..25b1031 100644
--- a/kernel/kmod.c
+++ b/kernel/kmod.c
@@ -80,16 +80,16 @@ int __request_module(bool wait, const char *fmt, ...)
#define MAX_KMOD_CONCURRENT 50 /* Completely arbitrary value - KAO */
static int kmod_loop_msg;
- ret = security_kernel_module_request();
- if (ret)
- return ret;
-
va_start(args, fmt);
ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
va_end(args);
if (ret >= MODULE_NAME_LEN)
return -ENAMETOOLONG;
+ ret = security_kernel_module_request(module_name);
+ if (ret)
+ return ret;
+
/* If modprobe needs a service that is in a module, we get a recursive
* loop. Limit the number of running kmod threads to max_threads/2 or
* MAX_KMOD_CONCURRENT, whichever is the smaller. A cleaner method
diff --git a/security/capability.c b/security/capability.c
index 4f3ab47..5c700e1 100644
--- a/security/capability.c
+++ b/security/capability.c
@@ -421,7 +421,7 @@ static int cap_kernel_create_files_as(struct cred *new, struct inode *inode)
return 0;
}
-static int cap_kernel_module_request(void)
+static int cap_kernel_module_request(char *kmod_name)
{
return 0;
}
diff --git a/security/lsm_audit.c b/security/lsm_audit.c
index 3bb90b6..51bd0fd 100644
--- a/security/lsm_audit.c
+++ b/security/lsm_audit.c
@@ -354,6 +354,10 @@ static void dump_common_audit_data(struct audit_buffer *ab,
}
break;
#endif
+ case LSM_AUDIT_DATA_KMOD:
+ audit_log_format(ab, " kmod=");
+ audit_log_untrustedstring(ab, a->u.kmod_name);
+ break;
} /* switch (a->type) */
}
diff --git a/security/security.c b/security/security.c
index aad71b2..24e060b 100644
--- a/security/security.c
+++ b/security/security.c
@@ -764,9 +764,9 @@ int security_kernel_create_files_as(struct cred *new, struct inode *inode)
return security_ops->kernel_create_files_as(new, inode);
}
-int security_kernel_module_request(void)
+int security_kernel_module_request(char *kmod_name)
{
- return security_ops->kernel_module_request();
+ return security_ops->kernel_module_request(kmod_name);
}
int security_task_setuid(uid_t id0, uid_t id1, uid_t id2, int flags)
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index a29d661..c96d63e 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -3337,9 +3337,18 @@ static int selinux_kernel_create_files_as(struct cred *new, struct inode *inode)
return 0;
}
-static int selinux_kernel_module_request(void)
+static int selinux_kernel_module_request(char *kmod_name)
{
- return task_has_system(current, SYSTEM__MODULE_REQUEST);
+ u32 sid;
+ struct common_audit_data ad;
+
+ sid = task_sid(current);
+
+ COMMON_AUDIT_DATA_INIT(&ad, KMOD);
+ ad.u.kmod_name = kmod_name;
+
+ return avc_has_perm(sid, SECINITSID_KERNEL, SECCLASS_SYSTEM,
+ SYSTEM__MODULE_REQUEST, &ad);
}
static int selinux_task_setpgid(struct task_struct *p, pid_t pgid)
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