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Message-ID: <20170126201451.GC3092@madcap2.tricolour.ca>
Date: Thu, 26 Jan 2017 15:14:51 -0500
From: Richard Guy Briggs <rgb@...hat.com>
To: linux-kernel@...r.kernel.org, linux-audit@...hat.com
Cc: Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [RFC] [PATCH] audit: log module name on init_module
On 2017-01-26 14:50, Richard Guy Briggs wrote:
> 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>
Self-NACK. I just realize this is on a crusty version. I'll send an updated patch.
> ---
> 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 476bc12..6222042 100644
> --- a/include/linux/audit.h
> +++ b/include/linux/audit.h
> @@ -358,6 +358,7 @@ 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)
> {
> @@ -434,6 +435,12 @@ 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 */
> @@ -539,6 +546,11 @@ 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 843540c..513c930 100644
> --- a/include/uapi/linux/audit.h
> +++ b/include/uapi/linux/audit.h
> @@ -110,6 +110,7 @@
> #define AUDIT_SECCOMP 1326 /* Secure Computing event */
> #define AUDIT_PROCTITLE 1327 /* Proctitle emit event */
> #define AUDIT_FEATURE_CHANGE 1328 /* audit log listing feature changes */
> +#define AUDIT_MODULE_INIT 1329 /* 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 de6cbb7..cf86486 100644
> --- a/kernel/audit.h
> +++ b/kernel/audit.h
> @@ -198,6 +198,9 @@ 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 b86cc04..93967b8 100644
> --- a/kernel/auditsc.c
> +++ b/kernel/auditsc.c
> @@ -1168,6 +1168,14 @@ static void audit_log_execve_info(struct audit_context *context,
> kfree(buf);
> }
>
> +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;
> @@ -1264,6 +1272,9 @@ 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);
> }
> @@ -2356,6 +2367,15 @@ 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 8f051a1..214ba85 100644
> --- a/kernel/module.c
> +++ b/kernel/module.c
> @@ -59,6 +59,7 @@
> #include <linux/jump_label.h>
> #include <linux/pfn.h>
> #include <linux/bsearch.h>
> +#include <linux/audit.h>
> #include <uapi/linux/module.h>
> #include "module-internal.h"
>
> @@ -3441,6 +3442,8 @@ 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)
> @@ -3525,7 +3528,7 @@ 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 bug_cleanup;
> --
> 1.7.1
>
> --
> Linux-audit mailing list
> Linux-audit@...hat.com
> https://www.redhat.com/mailman/listinfo/linux-audit
- RGB
--
Richard Guy Briggs <rgb@...hat.com>
Kernel Security Engineering, Base Operating Systems, Red Hat
Remote, Ottawa, Canada
Voice: +1.647.777.2635, Internal: (81) 32635
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