Messages in this thread | | | Subject | Re: [PATCH net] net: hns3: Fix for out-of-bounds access when setting pfc back pressure | From | Yunsheng Lin <> | Date | Fri, 2 Nov 2018 08:48:43 +0800 |
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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@huawei.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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