Re: 回复: [PATCH v2] libnvdimm: KASAN: global-out-of-bounds Read in internal_create_group

[Verma, Vishal L]

On Wed, 2020-08-19 at 03:23 +0000, Zhang, Qiang wrote:
> cc: Dan Williams
> Please review.

Hi Qiang,

I've got this queued up, I'll submit it for -rc2.

Thanks,
-Vishal

> 
> ________________________________________
> 发件人: linux-kernel-owner@xxxxxxxxxxxxxxx <linux-kernel-owner@xxxxxxxxxxxxxxx> 代表 qiang.zhang@xxxxxxxxxxxxx <qiang.zhang@xxxxxxxxxxxxx>
> 发送时间: 2020年8月12日 16:55
> 收件人: dan.j.williams@xxxxxxxxx; vishal.l.verma@xxxxxxxxx; dave.jiang@xxxxxxxxx; ira.weiny@xxxxxxxxx
> 抄送: linux-nvdimm@xxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx
> 主题: [PATCH v2] libnvdimm: KASAN: global-out-of-bounds Read in internal_create_group
> 
> From: Zqiang <qiang.zhang@xxxxxxxxxxxxx>
> 
> Because the last member of the "nvdimm_firmware_attributes" array
> was not assigned a null ptr, when traversal of "grp->attrs" array
> is out of bounds in "create_files" func.
> 
> func:
>         create_files:
>                 ->for (i = 0, attr = grp->attrs; *attr && !error; i++, attr++)
>                         ->....
> 
> BUG: KASAN: global-out-of-bounds in create_files fs/sysfs/group.c:43 [inline]
> BUG: KASAN: global-out-of-bounds in internal_create_group+0x9d8/0xb20
> fs/sysfs/group.c:149
> Read of size 8 at addr ffffffff8a2e4cf0 by task kworker/u17:10/959
> 
> CPU: 2 PID: 959 Comm: kworker/u17:10 Not tainted 5.8.0-syzkaller #0
> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009),
> BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
> Workqueue: events_unbound async_run_entry_fn
> Call Trace:
>  __dump_stack lib/dump_stack.c:77 [inline]
>  dump_stack+0x18f/0x20d lib/dump_stack.c:118
>  print_address_description.constprop.0.cold+0x5/0x497 mm/kasan/report.c:383
>  __kasan_report mm/kasan/report.c:513 [inline]
>  kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530
>  create_files fs/sysfs/group.c:43 [inline]
>  internal_create_group+0x9d8/0xb20 fs/sysfs/group.c:149
>  internal_create_groups.part.0+0x90/0x140 fs/sysfs/group.c:189
>  internal_create_groups fs/sysfs/group.c:185 [inline]
>  sysfs_create_groups+0x25/0x50 fs/sysfs/group.c:215
>  device_add_groups drivers/base/core.c:2024 [inline]
>  device_add_attrs drivers/base/core.c:2178 [inline]
>  device_add+0x7fd/0x1c40 drivers/base/core.c:2881
>  nd_async_device_register+0x12/0x80 drivers/nvdimm/bus.c:506
>  async_run_entry_fn+0x121/0x530 kernel/async.c:123
>  process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
>  worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
>  kthread+0x3b5/0x4a0 kernel/kthread.c:292
>  ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
> 
> The buggy address belongs to the variable:
>  nvdimm_firmware_attributes+0x10/0x40
> 
> Reported-by: syzbot+1cf0ffe61aecf46f588f@xxxxxxxxxxxxxxxxxxxxxxxxx
> Signed-off-by: Zqiang <qiang.zhang@xxxxxxxxxxxxx>
> ---
>  v1->v2:
>  Modify the description of the error.
> 
>  drivers/nvdimm/dimm_devs.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/nvdimm/dimm_devs.c b/drivers/nvdimm/dimm_devs.c
> index 61374def5155..b59032e0859b 100644
> --- a/drivers/nvdimm/dimm_devs.c
> +++ b/drivers/nvdimm/dimm_devs.c
> @@ -529,6 +529,7 @@ static DEVICE_ATTR_ADMIN_RW(activate);
>  static struct attribute *nvdimm_firmware_attributes[] = {
>         &dev_attr_activate.attr,
>         &dev_attr_result.attr,
> +       NULL,
>  };
> 
>  static umode_t nvdimm_firmware_visible(struct kobject *kobj, struct attribute *a, int n)
> --
> 2.17.1
> 
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