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Message-Id: <2f5850f7ba8026763eedf5ebabbb020929aab82c.1485461541.git.rgb@redhat.com>
Date: Thu, 26 Jan 2017 16:21:09 -0500
From: Richard Guy Briggs <rgb@...hat.com>
To: linux-kernel@...r.kernel.org, linux-audit@...hat.com
Cc: Richard Guy Briggs <rgb@...hat.com>,
Eric Paris <eparis@...hat.com>, Paul Moore <pmoore@...hat.com>,
Steve Grubb <sgrubb@...hat.com>,
Rusty Russell <rusty@...tcorp.com.au>
Subject: [RFC] [PATCH] audit: log module name on init_module
This adds a new auxiliary record MODULE_INIT to the SYSCALL event.
We get finit_module for free since it made most sense to hook this in to
load_module().
https://github.com/linux-audit/audit-kernel/issues/7
https://github.com/linux-audit/audit-kernel/wiki/RFE-Module-load-record-format
Signed-off-by: Richard Guy Briggs <rgb@...hat.com>
---
include/linux/audit.h | 12 ++++++++++++
include/uapi/linux/audit.h | 1 +
kernel/audit.h | 3 +++
kernel/auditsc.c | 20 ++++++++++++++++++++
kernel/module.c | 5 ++++-
5 files changed, 40 insertions(+), 1 deletions(-)
diff --git a/include/linux/audit.h b/include/linux/audit.h
index 2be99b2..7bb23d5 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -360,6 +360,7 @@ extern int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
const struct cred *old);
extern void __audit_log_capset(const struct cred *new, const struct cred *old);
extern void __audit_mmap_fd(int fd, int flags);
+extern void __audit_module_init(char *name);
static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp)
{
@@ -450,6 +451,12 @@ static inline void audit_mmap_fd(int fd, int flags)
__audit_mmap_fd(fd, flags);
}
+static inline void audit_module_init(char *name)
+{
+ if (!audit_dummy_context())
+ __audit_module_init(name);
+}
+
extern int audit_n_rules;
extern int audit_signals;
#else /* CONFIG_AUDITSYSCALL */
@@ -561,6 +568,11 @@ static inline void audit_log_capset(const struct cred *new,
{ }
static inline void audit_mmap_fd(int fd, int flags)
{ }
+
+static inline void audit_module_init(char *name)
+{
+}
+
static inline void audit_ptrace(struct task_struct *t)
{ }
#define audit_n_rules 0
diff --git a/include/uapi/linux/audit.h b/include/uapi/linux/audit.h
index 3f24110..4a328b4 100644
--- a/include/uapi/linux/audit.h
+++ b/include/uapi/linux/audit.h
@@ -111,6 +111,7 @@
#define AUDIT_PROCTITLE 1327 /* Proctitle emit event */
#define AUDIT_FEATURE_CHANGE 1328 /* audit log listing feature changes */
#define AUDIT_REPLACE 1329 /* Replace auditd if this packet unanswerd */
+#define AUDIT_MODULE_INIT 1330 /* Module init event */
#define AUDIT_AVC 1400 /* SE Linux avc denial or grant */
#define AUDIT_SELINUX_ERR 1401 /* Internal SE Linux Errors */
diff --git a/kernel/audit.h b/kernel/audit.h
index 431444c..144b7eb 100644
--- a/kernel/audit.h
+++ b/kernel/audit.h
@@ -199,6 +199,9 @@ struct audit_context {
struct {
int argc;
} execve;
+ struct {
+ char *name;
+ } module;
};
int fds[2];
struct audit_proctitle proctitle;
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index bb5f504..3e12678 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -1172,6 +1172,14 @@ out:
kfree(buf_head);
}
+static void audit_log_kern_module(struct audit_context *context,
+ struct audit_buffer **ab)
+{
+ audit_log_format(*ab, " name=");
+ audit_log_untrustedstring(*ab, context->module.name);
+ kfree(context->module.name);
+}
+
static void show_special(struct audit_context *context, int *call_panic)
{
struct audit_buffer *ab;
@@ -1268,6 +1276,9 @@ static void show_special(struct audit_context *context, int *call_panic)
case AUDIT_EXECVE: {
audit_log_execve_info(context, &ab);
break; }
+ case AUDIT_MODULE_INIT:
+ audit_log_kern_module(context, &ab);
+ break;
}
audit_log_end(ab);
}
@@ -2368,6 +2379,15 @@ void __audit_mmap_fd(int fd, int flags)
context->type = AUDIT_MMAP;
}
+void __audit_module_init(char *name)
+{
+ struct audit_context *context = current->audit_context;
+
+ context->module.name = kmalloc(strlen(name) + 1, GFP_KERNEL);
+ strcpy(context->module.name, name);
+ context->type = AUDIT_MODULE_INIT;
+}
+
static void audit_log_task(struct audit_buffer *ab)
{
kuid_t auid, uid;
diff --git a/kernel/module.c b/kernel/module.c
index 529efae..678407e 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -61,6 +61,7 @@
#include <linux/pfn.h>
#include <linux/bsearch.h>
#include <linux/dynamic_debug.h>
+#include <linux/audit.h>
#include <uapi/linux/module.h>
#include "module-internal.h"
@@ -3593,6 +3594,8 @@ static int load_module(struct load_info *info, const char __user *uargs,
goto free_copy;
}
+ audit_module_init(mod->name);
+
/* Reserve our place in the list. */
err = add_unformed_module(mod);
if (err)
@@ -3681,7 +3684,7 @@ static int load_module(struct load_info *info, const char __user *uargs,
mod->name, after_dashes);
}
- /* Link in to syfs. */
+ /* Link in to sysfs. */
err = mod_sysfs_setup(mod, info, mod->kp, mod->num_kp);
if (err < 0)
goto coming_cleanup;
--
1.7.1
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