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xfrm: use time64_t for in-kernel timestamps

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The lifetime managment uses '__u64' timestamps on the user space
interface, but 'unsigned long' for reading the current time in the kernel
with get_seconds().

While this is probably safe beyond y2038, it will still overflow in 2106,
and the get_seconds() call is deprecated because fo that.

This changes the xfrm time handling to use time64_t consistently, along
with reading the time using the safer ktime_get_real_seconds(). It still
suffers from problems that can happen from a concurrent settimeofday()
call or (to a lesser degree) a leap second update, but since the time
stamps are part of the user API, there is nothing we can do to prevent
that.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Arnd Bergmann 2018-07-11 12:19:13 +02:00 committed by Steffen Klassert
parent 6d8e85ffe1
commit 386c5680e2
2 changed files with 17 additions and 17 deletions
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24
net/xfrm/xfrm_policy.c
View file

@ -189,8 +189,8 @@ static inline unsigned long make_jiffies(long secs)
static void xfrm_policy_timer(struct timer_list *t)
{
struct xfrm_policy *xp = from_timer(xp, t, timer);
unsigned long now = get_seconds();
long next = LONG_MAX;
time64_t now = ktime_get_real_seconds();
time64_t next = TIME64_MAX;
int warn = 0;
int dir;
@ -202,7 +202,7 @@ static void xfrm_policy_timer(struct timer_list *t)
dir = xfrm_policy_id2dir(xp->index);
if (xp->lft.hard_add_expires_seconds) {
long tmo = xp->lft.hard_add_expires_seconds +
time64_t tmo = xp->lft.hard_add_expires_seconds +
xp->curlft.add_time - now;
if (tmo <= 0)
goto expired;
@ -210,7 +210,7 @@ static void xfrm_policy_timer(struct timer_list *t)
next = tmo;
}
if (xp->lft.hard_use_expires_seconds) {
long tmo = xp->lft.hard_use_expires_seconds +
time64_t tmo = xp->lft.hard_use_expires_seconds +
(xp->curlft.use_time ? : xp->curlft.add_time) - now;
if (tmo <= 0)
goto expired;
@ -218,7 +218,7 @@ static void xfrm_policy_timer(struct timer_list *t)
next = tmo;
}
if (xp->lft.soft_add_expires_seconds) {
long tmo = xp->lft.soft_add_expires_seconds +
time64_t tmo = xp->lft.soft_add_expires_seconds +
xp->curlft.add_time - now;
if (tmo <= 0) {
warn = 1;
@ -228,7 +228,7 @@ static void xfrm_policy_timer(struct timer_list *t)
next = tmo;
}
if (xp->lft.soft_use_expires_seconds) {
long tmo = xp->lft.soft_use_expires_seconds +
time64_t tmo = xp->lft.soft_use_expires_seconds +
(xp->curlft.use_time ? : xp->curlft.add_time) - now;
if (tmo <= 0) {
warn = 1;
@ -240,7 +240,7 @@ static void xfrm_policy_timer(struct timer_list *t)
if (warn)
km_policy_expired(xp, dir, 0, 0);
if (next != LONG_MAX &&
if (next != TIME64_MAX &&
!mod_timer(&xp->timer, jiffies + make_jiffies(next)))
xfrm_pol_hold(xp);
@ -791,7 +791,7 @@ int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
}
policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir, policy->index);
hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index));
policy->curlft.add_time = get_seconds();
policy->curlft.add_time = ktime_get_real_seconds();
policy->curlft.use_time = 0;
if (!mod_timer(&policy->timer, jiffies + HZ))
xfrm_pol_hold(policy);
@ -1282,7 +1282,7 @@ int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
old_pol = rcu_dereference_protected(sk->sk_policy[dir],
lockdep_is_held(&net->xfrm.xfrm_policy_lock));
if (pol) {
pol->curlft.add_time = get_seconds();
pol->curlft.add_time = ktime_get_real_seconds();
pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir, 0);
xfrm_sk_policy_link(pol, dir);
}
@ -2132,7 +2132,7 @@ no_transform:
}
for (i = 0; i < num_pols; i++)
pols[i]->curlft.use_time = get_seconds();
pols[i]->curlft.use_time = ktime_get_real_seconds();
if (num_xfrms < 0) {
/* Prohibit the flow */
@ -2352,7 +2352,7 @@ int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
return 1;
}
pol->curlft.use_time = get_seconds();
pol->curlft.use_time = ktime_get_real_seconds();
pols[0] = pol;
npols++;
@ -2366,7 +2366,7 @@ int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
return 0;
}
pols[1]->curlft.use_time = get_seconds();
pols[1]->curlft.use_time = ktime_get_real_seconds();
npols++;
}
}

10
net/xfrm/xfrm_state.c
View file

@ -475,8 +475,8 @@ static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me)
{
struct tasklet_hrtimer *thr = container_of(me, struct tasklet_hrtimer, timer);
struct xfrm_state *x = container_of(thr, struct xfrm_state, mtimer);
unsigned long now = get_seconds();
long next = LONG_MAX;
time64_t now = ktime_get_real_seconds();
time64_t next = TIME64_MAX;
int warn = 0;
int err = 0;
@ -537,7 +537,7 @@ static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me)
if (warn)
km_state_expired(x, 0, 0);
resched:
if (next != LONG_MAX) {
if (next != TIME64_MAX) {
tasklet_hrtimer_start(&x->mtimer, ktime_set(next, 0), HRTIMER_MODE_REL);
}
@ -577,7 +577,7 @@ struct xfrm_state *xfrm_state_alloc(struct net *net)
tasklet_hrtimer_init(&x->mtimer, xfrm_timer_handler,
CLOCK_BOOTTIME, HRTIMER_MODE_ABS);
timer_setup(&x->rtimer, xfrm_replay_timer_handler, 0);
x->curlft.add_time = get_seconds();
x->curlft.add_time = ktime_get_real_seconds();
x->lft.soft_byte_limit = XFRM_INF;
x->lft.soft_packet_limit = XFRM_INF;
x->lft.hard_byte_limit = XFRM_INF;
@ -1588,7 +1588,7 @@ EXPORT_SYMBOL(xfrm_state_update);
int xfrm_state_check_expire(struct xfrm_state *x)
{
if (!x->curlft.use_time)
x->curlft.use_time = get_seconds();
x->curlft.use_time = ktime_get_real_seconds();
if (x->curlft.bytes >= x->lft.hard_byte_limit ||
x->curlft.packets >= x->lft.hard_packet_limit) {