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Message-ID: <ac8f3031-9b20-2b63-058f-ba6aa5c4c28d@huawei.com>
Date: Fri, 2 Nov 2018 08:48:43 +0800
From: Yunsheng Lin <linyunsheng@...wei.com>
To: John Garry <john.garry@...wei.com>, <davem@...emloft.net>
CC: <huangdaode@...ilicon.com>, <xuwei5@...ilicon.com>,
<liguozhu@...ilicon.com>, <Yisen.Zhuang@...wei.com>,
<linuxarm@...wei.com>, <salil.mehta@...wei.com>,
<lipeng321@...wei.com>, <netdev@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net] net: hns3: Fix for out-of-bounds access when setting
pfc back pressure
On 2018/11/1 20:49, John Garry wrote:
> On 01/11/2018 12:12, Yunsheng Lin wrote:
>> The vport should be initialized to hdev->vport for each bp group,
>> otherwise it will cause out-of-bounds access and bp setting not
>> correct problem.
>>
>> [ 35.254124] BUG: KASAN: slab-out-of-bounds in hclge_pause_setup_hw+0x2a0/0x3f8 [hclge]
>> [ 35.254126] Read of size 2 at addr ffff803b6651581a by task kworker/0:1/14
>>
>> [ 35.254132] CPU: 0 PID: 14 Comm: kworker/0:1 Not tainted 4.19.0-rc7-hulk+ #85
>> [ 35.254133] Hardware name: Huawei D06/D06, BIOS Hisilicon D06 UEFI RC0 - B052 (V0.52) 09/14/2018
>> [ 35.254141] Workqueue: events work_for_cpu_fn
>> [ 35.254144] Call trace:
>> [ 35.254147] dump_backtrace+0x0/0x2f0
>> [ 35.254149] show_stack+0x24/0x30
>> [ 35.254154] dump_stack+0x110/0x184
>> [ 35.254157] print_address_description+0x168/0x2b0
>> [ 35.254160] kasan_report+0x184/0x310
>> [ 35.254162] __asan_load2+0x7c/0xa0
>> [ 35.254170] hclge_pause_setup_hw+0x2a0/0x3f8 [hclge]
>> [ 35.254177] hclge_tm_init_hw+0x794/0x9f0 [hclge]
>> [ 35.254184] hclge_tm_schd_init+0x48/0x58 [hclge]
>> [ 35.254191] hclge_init_ae_dev+0x778/0x1168 [hclge]
>> [ 35.254196] hnae3_register_ae_dev+0x14c/0x298 [hnae3]
>> [ 35.254206] hns3_probe+0x88/0xa8 [hns3]
>> [ 35.254210] local_pci_probe+0x7c/0xf0
>> [ 35.254212] work_for_cpu_fn+0x34/0x50
>> [ 35.254214] process_one_work+0x4d4/0xa38
>> [ 35.254216] worker_thread+0x55c/0x8d8
>> [ 35.254219] kthread+0x1b0/0x1b8
>> [ 35.254222] ret_from_fork+0x10/0x1c
>>
>> [ 35.254224] The buggy address belongs to the page:
>> [ 35.254228] page:ffff7e00ed994400 count:1 mapcount:0 mapping:0000000000000000 index:0x0 compound_mapcount: 0
>> [ 35.273835] flags: 0xfffff8000008000(head)
>> [ 35.282007] raw: 0fffff8000008000 dead000000000100 dead000000000200 0000000000000000
>> [ 35.282010] raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
>> [ 35.282012] page dumped because: kasan: bad access detected
>>
>> [ 35.282014] Memory state around the buggy address:
>> [ 35.282017] ffff803b66515700: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
>> [ 35.282019] ffff803b66515780: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
>> [ 35.282021] >ffff803b66515800: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
>> [ 35.282022] ^
>> [ 35.282024] ffff803b66515880: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
>> [ 35.282026] ffff803b66515900: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
>> [ 35.282028] ==================================================================
>> [ 35.282029] Disabling lock debugging due to kernel taint
>> [ 35.282747] hclge driver initialization finished.
>>
>> Fixes: 67bf2541f4b9 ("net: hns3: Fixes the back pressure setting when sriov is enabled")
>> Signed-off-by: Yunsheng Lin <linyunsheng@...wei.com>
>> ---
>> drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_tm.c | 3 ++-
>> 1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_tm.c b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_tm.c
>> index aa5cb98..0c9c6ae 100644
>> --- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_tm.c
>> +++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_tm.c
>> @@ -1168,11 +1168,12 @@ static int hclge_pfc_setup_hw(struct hclge_dev *hdev)
>> */
>> static int hclge_bp_setup_hw(struct hclge_dev *hdev, u8 tc)
>> {
>> - struct hclge_vport *vport = hdev->vport;
>> u32 i, k, qs_bitmap;
>> int ret;
>>
>> for (i = 0; i < HCLGE_BP_GRP_NUM; i++) {
>> + struct hclge_vport *vport = hdev->vport;
>> +
>
> It seems to me that the bug is fixed but the code is not much better.
>
> Since variable vport is only referenced in the inner loop, I would define it there.
I am agree that it is always better to have better and safer code.
I will provide another verion to limit local variable as much as possible.
Thanks for the reviewing and suggestion.
>
>> qs_bitmap = 0;
>>
>> for (k = 0; k < hdev->num_alloc_vport; k++) {
>>
>
> static int hclge_bp_setup_hw(struct hclge_dev *hdev, u8 tc)
> {
> - struct hclge_vport *vport = hdev->vport;
> - u32 i, k, qs_bitmap;
> - int ret;
> + int ret, i;
>
> for (i = 0; i < HCLGE_BP_GRP_NUM; i++) {
> - qs_bitmap = 0;
> + u32 qs_bitmap = 0;
> + int k;
>
> for (k = 0; k < hdev->num_alloc_vport; k++) {
> + struct hclge_vport *vport = &hdev->vport[k];
> u16 qs_id = vport->qs_offset + tc;
> u8 grp, sub_grp;
>
> ...
>
> if (i == grp)
> qs_bitmap |= (1 << sub_grp);
> -
> - vport++;
>
>
> ... so this seems better and safer, as you're explicitly limiting vport within bounds of hdev->num_alloc_vport.
>
>
>
> .
>
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