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audit: log module name on init_module

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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@redhat.com>
Acked-by: Jessica Yu <jeyu@redhat.com>
[PM: corrected links in the commit description]
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Richard Guy Briggs 2017-02-04 13:10:38 -05:00 committed by Paul Moore
parent 62bc306e20
commit ca86cad738
5 changed files with 34 additions and 1 deletions
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12
include/linux/audit.h
View File

@ -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_log_kern_module(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_log_kern_module(char *name)
{
if (!audit_dummy_context())
__audit_log_kern_module(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_log_kern_module(char *name)
{
}
static inline void audit_ptrace(struct task_struct *t)
{ }
#define audit_n_rules 0

1
include/uapi/linux/audit.h
View File

@ -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_KERN_MODULE 1330 /* Kernel Module events */
#define AUDIT_AVC 1400 /* SE Linux avc denial or grant */
#define AUDIT_SELINUX_ERR 1401 /* Internal SE Linux Errors */

3
kernel/audit.h
View File

@ -199,6 +199,9 @@ struct audit_context {
struct {
int argc;
} execve;
struct {
char *name;
} module;
};
int fds[2];
struct audit_proctitle proctitle;

14
kernel/auditsc.c
View File

@ -1268,6 +1268,11 @@ static void show_special(struct audit_context *context, int *call_panic)
case AUDIT_EXECVE: {
audit_log_execve_info(context, &ab);
break; }
case AUDIT_KERN_MODULE:
audit_log_format(ab, "name=");
audit_log_untrustedstring(ab, context->module.name);
kfree(context->module.name);
break;
}
audit_log_end(ab);
}
@ -2368,6 +2373,15 @@ void __audit_mmap_fd(int fd, int flags)
context->type = AUDIT_MMAP;
}
void __audit_log_kern_module(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_KERN_MODULE;
}
static void audit_log_task(struct audit_buffer *ab)
{
kuid_t auid, uid;

5
kernel/module.c
View File

@ -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_log_kern_module(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;