Commit a2b1a5d4 authored by Peilin Ye's avatar Peilin Ye Committed by Jakub Kicinski

net/sched: sch_netem: Fix arithmetic in netem_dump() for 32-bit platforms

As reported by Yuming, currently tc always show a latency of UINT_MAX
for netem Qdisc's on 32-bit platforms:

    $ tc qdisc add dev dummy0 root netem latency 100ms
    $ tc qdisc show dev dummy0
    qdisc netem 8001: root refcnt 2 limit 1000 delay 275s  275s
                                               ^^^^^^^^^^^^^^^^

Let us take a closer look at netem_dump():

        qopt.latency = min_t(psched_tdiff_t, PSCHED_NS2TICKS(q->latency,
                             UINT_MAX);

qopt.latency is __u32, psched_tdiff_t is signed long,
(psched_tdiff_t)(UINT_MAX) is negative for 32-bit platforms, so
qopt.latency is always UINT_MAX.

Fix it by using psched_time_t (u64) instead.

Note: confusingly, users have two ways to specify 'latency':

  1. normally, via '__u32 latency' in struct tc_netem_qopt;
  2. via the TCA_NETEM_LATENCY64 attribute, which is s64.

For the second case, theoretically 'latency' could be negative.  This
patch ignores that corner case, since it is broken (i.e. assigning a
negative s64 to __u32) anyways, and should be handled separately.

Thanks Ted Lin for the analysis [1] .

[1] https://github.com/raspberrypi/linux/issues/3512Reported-by: default avatarYuming Chen <chenyuming.junnan@bytedance.com>
Fixes: 112f9cb6 ("netem: convert to qdisc_watchdog_schedule_ns")
Reviewed-by: default avatarCong Wang <cong.wang@bytedance.com>
Signed-off-by: default avatarPeilin Ye <peilin.ye@bytedance.com>
Acked-by: default avatarStephen Hemminger <stephen@networkplumber.org>
Link: https://lore.kernel.org/r/20220616234336.2443-1-yepeilin.cs@gmail.comSigned-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent a3bb7b63
...@@ -1146,9 +1146,9 @@ static int netem_dump(struct Qdisc *sch, struct sk_buff *skb) ...@@ -1146,9 +1146,9 @@ static int netem_dump(struct Qdisc *sch, struct sk_buff *skb)
struct tc_netem_rate rate; struct tc_netem_rate rate;
struct tc_netem_slot slot; struct tc_netem_slot slot;
qopt.latency = min_t(psched_tdiff_t, PSCHED_NS2TICKS(q->latency), qopt.latency = min_t(psched_time_t, PSCHED_NS2TICKS(q->latency),
UINT_MAX); UINT_MAX);
qopt.jitter = min_t(psched_tdiff_t, PSCHED_NS2TICKS(q->jitter), qopt.jitter = min_t(psched_time_t, PSCHED_NS2TICKS(q->jitter),
UINT_MAX); UINT_MAX);
qopt.limit = q->limit; qopt.limit = q->limit;
qopt.loss = q->loss; qopt.loss = q->loss;
......
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