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

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Date:   Thu, 13 Oct 2022 10:56:27 +0200
From:   Paolo Abeni <pabeni@...hat.com>
To:     Cezar Bulinaru <cbulinaru@...il.com>, 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

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