net/sched: sch_taprio: fix undefined behavior in ktime_mono_to_any

1) if q->tk_offset == TK_OFFS_MAX, then get_tcp_tstamp() calls
   ktime_mono_to_any() with out-of-bound value.

2) if q->tk_offset is changed in taprio_parse_clockid(),
   taprio_get_time() might also call ktime_mono_to_any()
   with out-of-bound value as sysbot found:

UBSAN: array-index-out-of-bounds in kernel/time/timekeeping.c:908:27
index 3 is out of range for type 'ktime_t *[3]'
CPU: 1 PID: 25668 Comm: kworker/u4:0 Not tainted 5.15.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 ubsan_epilogue+0xb/0x5a lib/ubsan.c:151
 __ubsan_handle_out_of_bounds.cold+0x62/0x6c lib/ubsan.c:291
 ktime_mono_to_any+0x1d4/0x1e0 kernel/time/timekeeping.c:908
 get_tcp_tstamp net/sched/sch_taprio.c:322 [inline]
 get_packet_txtime net/sched/sch_taprio.c:353 [inline]
 taprio_enqueue_one+0x5b0/0x1460 net/sched/sch_taprio.c:420
 taprio_enqueue+0x3b1/0x730 net/sched/sch_taprio.c:485
 dev_qdisc_enqueue+0x40/0x300 net/core/dev.c:3785
 __dev_xmit_skb net/core/dev.c:3869 [inline]
 __dev_queue_xmit+0x1f6e/0x3630 net/core/dev.c:4194
 batadv_send_skb_packet+0x4a9/0x5f0 net/batman-adv/send.c:108
 batadv_iv_ogm_send_to_if net/batman-adv/bat_iv_ogm.c:393 [inline]
 batadv_iv_ogm_emit net/batman-adv/bat_iv_ogm.c:421 [inline]
 batadv_iv_send_outstanding_bat_ogm_packet+0x6d7/0x8e0 net/batman-adv/bat_iv_ogm.c:1701
 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

Fixes: 7ede7b03484b ("taprio: make clock reference conversions easier")
Fixes: 54002066100b ("taprio: Adjust timestamps for TCP packets")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Vedang Patel <vedang.patel@intel.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Reviewed-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Link: https://lore.kernel.org/r/20211108180815.1822479-1-eric.dumazet@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/net/sched/sch_taprio.c b/net/sched/sch_taprio.c
index 9ab068f..377f896 100644 (file)
--- a/net/sched/sch_taprio.c
+++ b/net/sched/sch_taprio.c
@@ -95,18 +95,22 @@ static ktime_t sched_base_time(const struct sched_gate_list *sched)
        return ns_to_ktime(sched->base_time);
 }
 
-static ktime_t taprio_get_time(struct taprio_sched *q)
+static ktime_t taprio_mono_to_any(const struct taprio_sched *q, ktime_t mono)
 {
-       ktime_t mono = ktime_get();
+       /* This pairs with WRITE_ONCE() in taprio_parse_clockid() */
+       enum tk_offsets tk_offset = READ_ONCE(q->tk_offset);
 
-       switch (q->tk_offset) {
+       switch (tk_offset) {
        case TK_OFFS_MAX:
                return mono;
        default:
-               return ktime_mono_to_any(mono, q->tk_offset);
+               return ktime_mono_to_any(mono, tk_offset);
        }
+}
 
-       return KTIME_MAX;
+static ktime_t taprio_get_time(const struct taprio_sched *q)
+{
+       return taprio_mono_to_any(q, ktime_get());
 }
 
 static void taprio_free_sched_cb(struct rcu_head *head)
@@ -319,7 +323,7 @@ static ktime_t get_tcp_tstamp(struct taprio_sched *q, struct sk_buff *skb)
                return 0;
        }
 
-       return ktime_mono_to_any(skb->skb_mstamp_ns, q->tk_offset);
+       return taprio_mono_to_any(q, skb->skb_mstamp_ns);
 }
 
 /* There are a few scenarios where we will have to modify the txtime from
@@ -1352,6 +1356,7 @@ static int taprio_parse_clockid(struct Qdisc *sch, struct nlattr **tb,
                }
        } else if (tb[TCA_TAPRIO_ATTR_SCHED_CLOCKID]) {
                int clockid = nla_get_s32(tb[TCA_TAPRIO_ATTR_SCHED_CLOCKID]);
+               enum tk_offsets tk_offset;
 
                /* We only support static clockids and we don't allow
                 * for it to be modified after the first init.
@@ -1366,22 +1371,24 @@ static int taprio_parse_clockid(struct Qdisc *sch, struct nlattr **tb,
 
                switch (clockid) {
                case CLOCK_REALTIME:
-                       q->tk_offset = TK_OFFS_REAL;
+                       tk_offset = TK_OFFS_REAL;
                        break;
                case CLOCK_MONOTONIC:
-                       q->tk_offset = TK_OFFS_MAX;
+                       tk_offset = TK_OFFS_MAX;
                        break;
                case CLOCK_BOOTTIME:
-                       q->tk_offset = TK_OFFS_BOOT;
+                       tk_offset = TK_OFFS_BOOT;
                        break;
                case CLOCK_TAI:
-                       q->tk_offset = TK_OFFS_TAI;
+                       tk_offset = TK_OFFS_TAI;
                        break;
                default:
                        NL_SET_ERR_MSG(extack, "Invalid 'clockid'");
                        err = -EINVAL;
                        goto out;
                }
+               /* This pairs with READ_ONCE() in taprio_mono_to_any */
+               WRITE_ONCE(q->tk_offset, tk_offset);
 
                q->clockid = clockid;
        } else {