netdev - Re: [PATCH v2] hv_netvsc: Fix a warning triggered by memcpy in rndis

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Message-ID: <CAG0ZtY6iJVS94ruMMuqxuORnV+eKE7SvPioE613UFT+FPScHXQ@mail.gmail.com>
Date:   Thu, 13 Oct 2022 22:46:34 -0400
From:   Cezar Bulinaru <cbulinaru@...il.com>
To:     Paolo Abeni <pabeni@...hat.com>
Cc:     kys@...rosoft.com, haiyangz@...rosoft.com, wei.liu@...nel.org,
        decui@...rosoft.com, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, linux-hyperv@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH v2] hv_netvsc: Fix a warning triggered by memcpy in rndis_filter

Thanks , I have  sent [PATCH v3] net: hv_netvsc: Fix a warning
triggered by memcpy in rndis_filter


On Thu, 13 Oct 2022 at 04:56, Paolo Abeni <pabeni@...hat.com> wrote:
>
> Hello,
>
> On Tue, 2022-10-11 at 21:39 -0400, Cezar Bulinaru wrote:
> > A warning is triggered when the response message len exceeds
> > the size of rndis_message. Inside the rndis_request structure
> > these fields are however followed by a RNDIS_EXT_LEN padding
> > so it is safe to use unsafe_memcpy.
> >
> > memcpy: detected field-spanning write (size 168) of single field "(void *)&request->response_msg + (sizeof(struct rndis_message) - sizeof(union rndis_message_container)) + sizeof(*req_id)" at drivers/net/hyperv/rndis_filter.c:338 (size 40)
> > RSP: 0018:ffffc90000144de0 EFLAGS: 00010282
> > RAX: 0000000000000000 RBX: ffff8881766b4000 RCX: 0000000000000000
> > RDX: 0000000000000102 RSI: 0000000000009ffb RDI: 00000000ffffffff
> > RBP: ffffc90000144e38 R08: 0000000000000000 R09: 00000000ffffdfff
> > R10: ffffc90000144c48 R11: ffffffff82f56ac8 R12: ffff8881766b403c
> > R13: 00000000000000a8 R14: ffff888100b75000 R15: ffff888179301d00
> > FS:  0000000000000000(0000) GS:ffff8884d6280000(0000) knlGS:0000000000000000
> > CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > CR2: 000055f8b024c418 CR3: 0000000176548001 CR4: 00000000003706e0
> > Call Trace:
> >  <IRQ>
> >  ? _raw_spin_unlock_irqrestore+0x27/0x50
> >  netvsc_poll+0x556/0x940 [hv_netvsc]
> >  __napi_poll+0x2e/0x170
> >  net_rx_action+0x299/0x2f0
> >  __do_softirq+0xed/0x2ef
> >  __irq_exit_rcu+0x9f/0x110
> >  irq_exit_rcu+0xe/0x20
> >  sysvec_hyperv_callback+0xb0/0xd0
> >  </IRQ>
> >  <TASK>
> >  asm_sysvec_hyperv_callback+0x1b/0x20
> > RIP: 0010:native_safe_halt+0xb/0x10
> >
> > Signed-off-by: Cezar Bulinaru <cbulinaru@...il.com>
>
> Could you please additionally provide a suitable 'Fixes' tag?
>
> You need to repost a new version, including such tag just before your
> SoB. While at that, please also include the target tree in the subj
> prefix (net).
>
> On this repost you can retain the ack/review tags collected so far.
>
> Thanks,
>
> Paolo
>