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Commit 03e1aa1c authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'stable-4.7' of git://git.infradead.org/users/pcmoore/audit 

Pull audit updates from Paul Moore:
 "Four small audit patches for 4.7.

  Two are simple cleanups around the audit thread management code, one
  adds a tty field to AUDIT_LOGIN events, and the final patch makes
  tty_name() usable regardless of CONFIG_TTY.

  Nothing controversial, and it all passes our regression test"

* 'stable-4.7' of git://git.infradead.org/users/pcmoore/audit:
  tty: provide tty_name() even without CONFIG_TTY
  audit: add tty field to LOGIN event
  audit: we don't need to __set_current_state(TASK_RUNNING)
  audit: cleanup prune_tree_thread
parents 97f00905 188e3c5c

include/linux/audit.h

+24 −0
Original line number Diff line number Diff line
@@ -26,6 +26,7 @@ 
#include <linux/sched.h>

#include <linux/ptrace.h>

#include <uapi/linux/audit.h>

#include <linux/tty.h>



#define AUDIT_INO_UNSET ((unsigned long)-1)

#define AUDIT_DEV_UNSET ((dev_t)-1)
@@ -347,6 +348,23 @@ static inline unsigned int audit_get_sessionid(struct task_struct *tsk) 
	return tsk->sessionid;

}



static inline struct tty_struct *audit_get_tty(struct task_struct *tsk)

{

	struct tty_struct *tty = NULL;

	unsigned long flags;



	spin_lock_irqsave(&tsk->sighand->siglock, flags);

	if (tsk->signal)

		tty = tty_kref_get(tsk->signal->tty);

	spin_unlock_irqrestore(&tsk->sighand->siglock, flags);

	return tty;

}



static inline void audit_put_tty(struct tty_struct *tty)

{

	tty_kref_put(tty);

}



extern void __audit_ipc_obj(struct kern_ipc_perm *ipcp);

extern void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode);

extern void __audit_bprm(struct linux_binprm *bprm);
@@ -504,6 +522,12 @@ static inline unsigned int audit_get_sessionid(struct task_struct *tsk) 
{

	return -1;

}

static inline struct tty_struct *audit_get_tty(struct task_struct *tsk)

{

	return NULL;

}

static inline void audit_put_tty(struct tty_struct *tty)

{ }

static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp)

{ }

static inline void audit_ipc_set_perm(unsigned long qbytes, uid_t uid,

include/linux/tty.h

+3 −1
Original line number Diff line number Diff line
@@ -371,6 +371,7 @@ extern void proc_clear_tty(struct task_struct *p); 
extern struct tty_struct *get_current_tty(void);

/* tty_io.c */

extern int __init tty_init(void);

extern const char *tty_name(const struct tty_struct *tty);

#else

static inline void console_init(void)

{ }
@@ -391,6 +392,8 @@ static inline struct tty_struct *get_current_tty(void) 
/* tty_io.c */

static inline int __init tty_init(void)

{ return 0; }

static inline const char *tty_name(const struct tty_struct *tty)

{ return "(none)"; }

#endif



extern struct ktermios tty_std_termios;
@@ -415,7 +418,6 @@ static inline struct tty_struct *tty_kref_get(struct tty_struct *tty) 
	return tty;

}



extern const char *tty_name(const struct tty_struct *tty);

extern const char *tty_driver_name(const struct tty_struct *tty);

extern void tty_wait_until_sent(struct tty_struct *tty, long timeout);

extern int __tty_check_change(struct tty_struct *tty, int sig);

kernel/audit.c

+10 −20
Original line number Diff line number Diff line
@@ -64,7 +64,6 @@ 
#include <linux/security.h>

#endif

#include <linux/freezer.h>

#include <linux/tty.h>

#include <linux/pid_namespace.h>

#include <net/netns/generic.h>
@@ -430,7 +429,6 @@ static void kauditd_send_skb(struct sk_buff *skb) 
					attempts, audit_pid);

				set_current_state(TASK_INTERRUPTIBLE);

				schedule();

				__set_current_state(TASK_RUNNING);

				goto restart;

			}

		}
@@ -1341,15 +1339,14 @@ static inline void audit_get_stamp(struct audit_context *ctx, 
static long wait_for_auditd(long sleep_time)

{

	DECLARE_WAITQUEUE(wait, current);

	set_current_state(TASK_UNINTERRUPTIBLE);

	add_wait_queue_exclusive(&audit_backlog_wait, &wait);



	if (audit_backlog_limit &&

	    skb_queue_len(&audit_skb_queue) > audit_backlog_limit)

	    skb_queue_len(&audit_skb_queue) > audit_backlog_limit) {

		add_wait_queue_exclusive(&audit_backlog_wait, &wait);

		set_current_state(TASK_UNINTERRUPTIBLE);

		sleep_time = schedule_timeout(sleep_time);



	__set_current_state(TASK_RUNNING);

		remove_wait_queue(&audit_backlog_wait, &wait);

	}



	return sleep_time;

}
@@ -1890,21 +1887,14 @@ void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk) 
{

	const struct cred *cred;

	char comm[sizeof(tsk->comm)];

	char *tty;

	struct tty_struct *tty;



	if (!ab)

		return;



	/* tsk == current */

	cred = current_cred();



	spin_lock_irq(&tsk->sighand->siglock);

	if (tsk->signal && tsk->signal->tty && tsk->signal->tty->name)

		tty = tsk->signal->tty->name;

	else

		tty = "(none)";

	spin_unlock_irq(&tsk->sighand->siglock);



	tty = audit_get_tty(tsk);

	audit_log_format(ab,

			 " ppid=%d pid=%d auid=%u uid=%u gid=%u"

			 " euid=%u suid=%u fsuid=%u"
@@ -1920,11 +1910,11 @@ void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk) 
			 from_kgid(&init_user_ns, cred->egid),

			 from_kgid(&init_user_ns, cred->sgid),

			 from_kgid(&init_user_ns, cred->fsgid),

			 tty, audit_get_sessionid(tsk));



			 tty ? tty_name(tty) : "(none)",

			 audit_get_sessionid(tsk));

	audit_put_tty(tty);

	audit_log_format(ab, " comm=");

	audit_log_untrustedstring(ab, get_task_comm(comm, tsk));



	audit_log_d_path_exe(ab, tsk->mm);

	audit_log_task_context(ab);

}

kernel/audit_tree.c

+5 −7
Original line number Diff line number Diff line
@@ -661,10 +661,10 @@ static int tag_mount(struct vfsmount *mnt, void *arg) 
static int prune_tree_thread(void *unused)

{

	for (;;) {

		if (list_empty(&prune_list)) {

			set_current_state(TASK_INTERRUPTIBLE);

		if (list_empty(&prune_list))

			schedule();

		__set_current_state(TASK_RUNNING);

		}



		mutex_lock(&audit_cmd_mutex);

		mutex_lock(&audit_filter_mutex);
@@ -693,16 +693,14 @@ static int audit_launch_prune(void) 
{

	if (prune_thread)

		return 0;

	prune_thread = kthread_create(prune_tree_thread, NULL,

	prune_thread = kthread_run(prune_tree_thread, NULL,

				"audit_prune_tree");

	if (IS_ERR(prune_thread)) {

		pr_err("cannot start thread audit_prune_tree");

		prune_thread = NULL;

		return -ENOMEM;

	} else {

		wake_up_process(prune_thread);

		return 0;

	}

	return 0;

}



/* called with audit_filter_mutex */

kernel/auditsc.c

+6 −2
Original line number Diff line number Diff line
@@ -1980,6 +1980,7 @@ static void audit_log_set_loginuid(kuid_t koldloginuid, kuid_t kloginuid, 
{

	struct audit_buffer *ab;

	uid_t uid, oldloginuid, loginuid;

	struct tty_struct *tty;



	if (!audit_enabled)

		return;
@@ -1987,14 +1988,17 @@ static void audit_log_set_loginuid(kuid_t koldloginuid, kuid_t kloginuid, 
	uid = from_kuid(&init_user_ns, task_uid(current));

	oldloginuid = from_kuid(&init_user_ns, koldloginuid);

	loginuid = from_kuid(&init_user_ns, kloginuid),

	tty = audit_get_tty(current);



	ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_LOGIN);

	if (!ab)

		return;

	audit_log_format(ab, "pid=%d uid=%u", task_pid_nr(current), uid);

	audit_log_task_context(ab);

	audit_log_format(ab, " old-auid=%u auid=%u old-ses=%u ses=%u res=%d",

			 oldloginuid, loginuid, oldsessionid, sessionid, !rc);

	audit_log_format(ab, " old-auid=%u auid=%u tty=%s old-ses=%u ses=%u res=%d",

			 oldloginuid, loginuid, tty ? tty_name(tty) : "(none)",

			 oldsessionid, sessionid, !rc);

	audit_put_tty(tty);

	audit_log_end(ab);

}