summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
-rw-r--r--include/linux/audit.h61
-rw-r--r--include/uapi/linux/audit.h1
-rw-r--r--kernel/auditsc.c22
-rw-r--r--kernel/time/ntp.c22
-rw-r--r--kernel/time/ntp_internal.h4
-rw-r--r--kernel/time/timekeeping.c7
6 files changed, 112 insertions, 5 deletions
diff --git a/include/linux/audit.h b/include/linux/audit.h
index 2c62c0468888..43a23e28ba23 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -86,6 +86,29 @@ struct audit_field {
u32 op;
};
+enum audit_ntp_type {
+ AUDIT_NTP_OFFSET,
+ AUDIT_NTP_FREQ,
+ AUDIT_NTP_STATUS,
+ AUDIT_NTP_TAI,
+ AUDIT_NTP_TICK,
+ AUDIT_NTP_ADJUST,
+
+ AUDIT_NTP_NVALS /* count */
+};
+
+#ifdef CONFIG_AUDITSYSCALL
+struct audit_ntp_val {
+ long long oldval, newval;
+};
+
+struct audit_ntp_data {
+ struct audit_ntp_val vals[AUDIT_NTP_NVALS];
+};
+#else
+struct audit_ntp_data {};
+#endif
+
extern int is_audit_feature_set(int which);
extern int __init audit_register_class(int class, unsigned *list);
@@ -366,6 +389,7 @@ extern void __audit_mmap_fd(int fd, int flags);
extern void __audit_log_kern_module(char *name);
extern void __audit_fanotify(unsigned int response);
extern void __audit_tk_injoffset(struct timespec64 offset);
+extern void __audit_ntp_log(const struct audit_ntp_data *ad);
static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp)
{
@@ -478,6 +502,29 @@ static inline void audit_tk_injoffset(struct timespec64 offset)
__audit_tk_injoffset(offset);
}
+static inline void audit_ntp_init(struct audit_ntp_data *ad)
+{
+ memset(ad, 0, sizeof(*ad));
+}
+
+static inline void audit_ntp_set_old(struct audit_ntp_data *ad,
+ enum audit_ntp_type type, long long val)
+{
+ ad->vals[type].oldval = val;
+}
+
+static inline void audit_ntp_set_new(struct audit_ntp_data *ad,
+ enum audit_ntp_type type, long long val)
+{
+ ad->vals[type].newval = val;
+}
+
+static inline void audit_ntp_log(const struct audit_ntp_data *ad)
+{
+ if (!audit_dummy_context())
+ __audit_ntp_log(ad);
+}
+
extern int audit_n_rules;
extern int audit_signals;
#else /* CONFIG_AUDITSYSCALL */
@@ -594,6 +641,20 @@ static inline void audit_fanotify(unsigned int response)
static inline void audit_tk_injoffset(struct timespec64 offset)
{ }
+static inline void audit_ntp_init(struct audit_ntp_data *ad)
+{ }
+
+static inline void audit_ntp_set_old(struct audit_ntp_data *ad,
+ enum audit_ntp_type type, long long val)
+{ }
+
+static inline void audit_ntp_set_new(struct audit_ntp_data *ad,
+ enum audit_ntp_type type, long long val)
+{ }
+
+static inline void audit_ntp_log(const struct audit_ntp_data *ad)
+{ }
+
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 ab58d67baf4d..a1280af20336 100644
--- a/include/uapi/linux/audit.h
+++ b/include/uapi/linux/audit.h
@@ -115,6 +115,7 @@
#define AUDIT_KERN_MODULE 1330 /* Kernel Module events */
#define AUDIT_FANOTIFY 1331 /* Fanotify access decision */
#define AUDIT_TIME_INJOFFSET 1332 /* Timekeeping offset injected */
+#define AUDIT_TIME_ADJNTPVAL 1333 /* NTP value adjustment */
#define AUDIT_AVC 1400 /* SE Linux avc denial or grant */
#define AUDIT_SELINUX_ERR 1401 /* Internal SE Linux Errors */
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 3843495d0083..5371b59bde36 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -2519,6 +2519,28 @@ void __audit_tk_injoffset(struct timespec64 offset)
(long long)offset.tv_sec, offset.tv_nsec);
}
+static void audit_log_ntp_val(const struct audit_ntp_data *ad,
+ const char *op, enum audit_ntp_type type)
+{
+ const struct audit_ntp_val *val = &ad->vals[type];
+
+ if (val->newval == val->oldval)
+ return;
+
+ audit_log(audit_context(), GFP_KERNEL, AUDIT_TIME_ADJNTPVAL,
+ "op=%s old=%lli new=%lli", op, val->oldval, val->newval);
+}
+
+void __audit_ntp_log(const struct audit_ntp_data *ad)
+{
+ audit_log_ntp_val(ad, "offset", AUDIT_NTP_OFFSET);
+ audit_log_ntp_val(ad, "freq", AUDIT_NTP_FREQ);
+ audit_log_ntp_val(ad, "status", AUDIT_NTP_STATUS);
+ audit_log_ntp_val(ad, "tai", AUDIT_NTP_TAI);
+ audit_log_ntp_val(ad, "tick", AUDIT_NTP_TICK);
+ audit_log_ntp_val(ad, "adjust", AUDIT_NTP_ADJUST);
+}
+
static void audit_log_task(struct audit_buffer *ab)
{
kuid_t auid, uid;
diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 92a90014a925..ac5555e25733 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -17,6 +17,7 @@
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/rtc.h>
+#include <linux/audit.h>
#include "ntp_internal.h"
#include "timekeeping_internal.h"
@@ -709,7 +710,7 @@ static inline void process_adjtimex_modes(const struct __kernel_timex *txc,
* kernel time-keeping variables. used by xntpd.
*/
int __do_adjtimex(struct __kernel_timex *txc, const struct timespec64 *ts,
- s32 *time_tai)
+ s32 *time_tai, struct audit_ntp_data *ad)
{
int result;
@@ -720,14 +721,29 @@ int __do_adjtimex(struct __kernel_timex *txc, const struct timespec64 *ts,
/* adjtime() is independent from ntp_adjtime() */
time_adjust = txc->offset;
ntp_update_frequency();
+
+ audit_ntp_set_old(ad, AUDIT_NTP_ADJUST, save_adjust);
+ audit_ntp_set_new(ad, AUDIT_NTP_ADJUST, time_adjust);
}
txc->offset = save_adjust;
} else {
-
/* If there are input parameters, then process them: */
- if (txc->modes)
+ if (txc->modes) {
+ audit_ntp_set_old(ad, AUDIT_NTP_OFFSET, time_offset);
+ audit_ntp_set_old(ad, AUDIT_NTP_FREQ, time_freq);
+ audit_ntp_set_old(ad, AUDIT_NTP_STATUS, time_status);
+ audit_ntp_set_old(ad, AUDIT_NTP_TAI, *time_tai);
+ audit_ntp_set_old(ad, AUDIT_NTP_TICK, tick_usec);
+
process_adjtimex_modes(txc, time_tai);
+ audit_ntp_set_new(ad, AUDIT_NTP_OFFSET, time_offset);
+ audit_ntp_set_new(ad, AUDIT_NTP_FREQ, time_freq);
+ audit_ntp_set_new(ad, AUDIT_NTP_STATUS, time_status);
+ audit_ntp_set_new(ad, AUDIT_NTP_TAI, *time_tai);
+ audit_ntp_set_new(ad, AUDIT_NTP_TICK, tick_usec);
+ }
+
txc->offset = shift_right(time_offset * NTP_INTERVAL_FREQ,
NTP_SCALE_SHIFT);
if (!(time_status & STA_NANO))
diff --git a/kernel/time/ntp_internal.h b/kernel/time/ntp_internal.h
index 40e6122e634e..908ecaa65fc3 100644
--- a/kernel/time/ntp_internal.h
+++ b/kernel/time/ntp_internal.h
@@ -8,6 +8,8 @@ extern void ntp_clear(void);
extern u64 ntp_tick_length(void);
extern ktime_t ntp_get_next_leap(void);
extern int second_overflow(time64_t secs);
-extern int __do_adjtimex(struct __kernel_timex *txc, const struct timespec64 *ts, s32 *time_tai);
+extern int __do_adjtimex(struct __kernel_timex *txc,
+ const struct timespec64 *ts,
+ s32 *time_tai, struct audit_ntp_data *ad);
extern void __hardpps(const struct timespec64 *phase_ts, const struct timespec64 *raw_ts);
#endif /* _LINUX_NTP_INTERNAL_H */
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 3d24be4cd607..f366f2fdf1b0 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -2307,6 +2307,7 @@ static int timekeeping_validate_timex(const struct __kernel_timex *txc)
int do_adjtimex(struct __kernel_timex *txc)
{
struct timekeeper *tk = &tk_core.timekeeper;
+ struct audit_ntp_data ad;
unsigned long flags;
struct timespec64 ts;
s32 orig_tai, tai;
@@ -2330,13 +2331,15 @@ int do_adjtimex(struct __kernel_timex *txc)
audit_tk_injoffset(delta);
}
+ audit_ntp_init(&ad);
+
ktime_get_real_ts64(&ts);
raw_spin_lock_irqsave(&timekeeper_lock, flags);
write_seqcount_begin(&tk_core.seq);
orig_tai = tai = tk->tai_offset;
- ret = __do_adjtimex(txc, &ts, &tai);
+ ret = __do_adjtimex(txc, &ts, &tai, &ad);
if (tai != orig_tai) {
__timekeeping_set_tai_offset(tk, tai);
@@ -2347,6 +2350,8 @@ int do_adjtimex(struct __kernel_timex *txc)
write_seqcount_end(&tk_core.seq);
raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
+ audit_ntp_log(&ad);
+
/* Update the multiplier immediately if frequency was set directly */
if (txc->modes & (ADJ_FREQUENCY | ADJ_TICK))
timekeeping_advance(TK_ADV_FREQ);