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net/sched: sch_taprio: fix undefined behavior in ktime_mono_to_any

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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: 7ede7b0348 ("taprio: make clock reference conversions easier")
Fixes: 5400206610 ("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>
This commit is contained in:
Eric Dumazet 2021-11-08 10:08:15 -08:00 committed by Jakub Kicinski
parent 43aa493799
commit 6dc25401cb
1 changed files with 17 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
net/sched/sch_taprio.c
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@ -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 {