From: Cong Wang <xiyou.wangcong@gmail.com>
To: Roman Mashak <mrv@mojatatu.com>
Cc: David Miller <davem@davemloft.net>,
Linux Kernel Network Developers <netdev@vger.kernel.org>,
kernel@mojatatu.com, Jamal Hadi Salim <jhs@mojatatu.com>,
Jiri Pirko <jiri@resnulli.us>,
Alexander Duyck <alexander.duyck@gmail.com>
Subject: Re: [PATCH v2 net 1/1] net sched actions: fix invalid pointer dereferencing if skbedit flags missing
Date: Fri, 11 May 2018 10:47:49 -0700 [thread overview]
Message-ID: <CAM_iQpWwMvfCdMt0StWWFit0LeEUVyTbUXSphXaf6uoTPXtvLQ@mail.gmail.com> (raw)
In-Reply-To: <1526050509-30487-1-git-send-email-mrv@mojatatu.com>
On Fri, May 11, 2018 at 7:55 AM, Roman Mashak <mrv@mojatatu.com> wrote:
> When application fails to pass flags in netlink TLV for a new skbedit action,
> the kernel results in the following oops:
>
> [ 8.307732] BUG: unable to handle kernel paging request at 0000000000021130
> [ 8.309167] PGD 80000000193d1067 P4D 80000000193d1067 PUD 180e0067 PMD 0
> [ 8.310595] Oops: 0000 [#1] SMP PTI
> [ 8.311334] Modules linked in: kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd cryptd glue_helper serio_raw
> [ 8.314190] CPU: 1 PID: 397 Comm: tc Not tainted 4.17.0-rc3+ #357
> [ 8.315252] RIP: 0010:__tcf_idr_release+0x33/0x140
> [ 8.316203] RSP: 0018:ffffa0718038f840 EFLAGS: 00010246
> [ 8.317123] RAX: 0000000000000001 RBX: 0000000000021100 RCX: 0000000000000000
> [ 8.319831] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000021100
> [ 8.321181] RBP: 0000000000000000 R08: 000000000004adf8 R09: 0000000000000122
> [ 8.322645] R10: 0000000000000000 R11: ffffffff9e5b01ed R12: 0000000000000000
> [ 8.324157] R13: ffffffff9e0d3cc0 R14: 0000000000000000 R15: 0000000000000000
> [ 8.325590] FS: 00007f591292e700(0000) GS:ffff8fcf5bc40000(0000) knlGS:0000000000000000
> [ 8.327001] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 8.327987] CR2: 0000000000021130 CR3: 00000000180e6004 CR4: 00000000001606a0
> [ 8.329289] Call Trace:
> [ 8.329735] tcf_skbedit_init+0xa7/0xb0
> [ 8.330423] tcf_action_init_1+0x362/0x410
> [ 8.331139] ? try_to_wake_up+0x44/0x430
> [ 8.331817] tcf_action_init+0x103/0x190
> [ 8.332511] tc_ctl_action+0x11a/0x220
> [ 8.333174] rtnetlink_rcv_msg+0x23d/0x2e0
> [ 8.333902] ? _cond_resched+0x16/0x40
> [ 8.334569] ? __kmalloc_node_track_caller+0x5b/0x2c0
> [ 8.335440] ? rtnl_calcit.isra.31+0xf0/0xf0
> [ 8.336178] netlink_rcv_skb+0xdb/0x110
> [ 8.336855] netlink_unicast+0x167/0x220
> [ 8.337550] netlink_sendmsg+0x2a7/0x390
> [ 8.338258] sock_sendmsg+0x30/0x40
> [ 8.338865] ___sys_sendmsg+0x2c5/0x2e0
> [ 8.339531] ? pagecache_get_page+0x27/0x210
> [ 8.340271] ? filemap_fault+0xa2/0x630
> [ 8.340943] ? page_add_file_rmap+0x108/0x200
> [ 8.341732] ? alloc_set_pte+0x2aa/0x530
> [ 8.342573] ? finish_fault+0x4e/0x70
> [ 8.343332] ? __handle_mm_fault+0xbc1/0x10d0
> [ 8.344337] ? __sys_sendmsg+0x53/0x80
> [ 8.345040] __sys_sendmsg+0x53/0x80
> [ 8.345678] do_syscall_64+0x4f/0x100
> [ 8.346339] entry_SYSCALL_64_after_hwframe+0x44/0xa9
> [ 8.347206] RIP: 0033:0x7f591191da67
> [ 8.347831] RSP: 002b:00007fff745abd48 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
> [ 8.349179] RAX: ffffffffffffffda RBX: 00007fff745abe70 RCX: 00007f591191da67
> [ 8.350431] RDX: 0000000000000000 RSI: 00007fff745abdc0 RDI: 0000000000000003
> [ 8.351659] RBP: 000000005af35251 R08: 0000000000000001 R09: 0000000000000000
> [ 8.352922] R10: 00000000000005f1 R11: 0000000000000246 R12: 0000000000000000
> [ 8.354183] R13: 00007fff745afed0 R14: 0000000000000001 R15: 00000000006767c0
> [ 8.355400] Code: 41 89 d4 53 89 f5 48 89 fb e8 aa 20 fd ff 85 c0 0f 84 ed 00
> 00 00 48 85 db 0f 84 cf 00 00 00 40 84 ed 0f 85 cd 00 00 00 45 84 e4 <8b> 53 30
> 74 0d 85 d2 b8 ff ff ff ff 0f 8f b3 00 00 00 8b 43 2c
> [ 8.358699] RIP: __tcf_idr_release+0x33/0x140 RSP: ffffa0718038f840
> [ 8.359770] CR2: 0000000000021130
> [ 8.360438] ---[ end trace 60c66be45dfc14f0 ]---
>
> The caller calls action's ->init() and passes pointer to "struct tc_action *a",
> which later may be initialized to point at the existing action, otherwise
> "struct tc_action *a" is still invalid, and therefore dereferencing it is an
> error as happens in tcf_idr_release, where refcnt is decremented.
>
> So in case of missing flags tcf_idr_release must be called only for
> existing actions.
>
> v2:
> - prepare patch for net tree
>
> Signed-off-by: Roman Mashak <mrv@mojatatu.com>
Fixes: 5e1567aeb7fe ("net sched: skbedit action fix late binding")
Acked-by: Cong Wang <xiyou.wangcong@gmail.com>
next prev parent reply other threads:[~2018-05-11 17:48 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-11 14:55 [PATCH v2 net 1/1] net sched actions: fix invalid pointer dereferencing if skbedit flags missing Roman Mashak
2018-05-11 17:47 ` Cong Wang [this message]
2018-05-11 19:53 ` David Miller
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