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linux/drivers/net/hyperv
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Cezar Bulinaru 017e425406 net: hv_netvsc: Fix a warning triggered by memcpy in rndis_filter 
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

Fixes: A warning 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.

Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Cezar Bulinaru <cbulinaru@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2022-10-15 11:09:53 +01:00
..
hyperv_net.h hv_netvsc: Fix race between VF offering and VF association message from host 2022-10-07 08:43:58 +01:00
Kconfig treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
Makefile hv_netvsc: Add XDP support 2020-01-25 10:43:19 +01:00
netvsc_bpf.c hv_netvsc: Add support for XDP_REDIRECT 2022-04-11 18:25:47 -07:00
netvsc_drv.c hv_netvsc: Fix race between VF offering and VF association message from host 2022-10-07 08:43:58 +01:00
netvsc_trace.c hv_netvsc: add trace points 2018-03-17 20:10:27 -04:00
netvsc_trace.h hv_netvsc: add trace points 2018-03-17 20:10:27 -04:00
netvsc.c hv_netvsc: Fix race between VF offering and VF association message from host 2022-10-07 08:43:58 +01:00
rndis_filter.c net: hv_netvsc: Fix a warning triggered by memcpy in rndis_filter 2022-10-15 11:09:53 +01:00