Hesham/wintun
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Consider receive NBLs to be immutable

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Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2019-06-24 15:24:59 +00:00
parent be8d2cb071
commit d50cab5732
1 changed files with 2 additions and 5 deletions
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wintun.c
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@ -246,11 +246,7 @@ static NTSTATUS TunGetIrpBuffer(_In_ IRP *Irp, _Out_ UCHAR **buffer, _Out_ ULONG
case IRP_MJ_WRITE: case IRP_MJ_WRITE:
*size = stack->Parameters.Write.Length; *size = stack->Parameters.Write.Length;
priority = NormalPagePriority | MdlMappingNoWrite;
/* If we use MdlMappingNoWrite flag and call NdisMIndicateReceiveNetBufferLists without
* NDIS_RECEIVE_FLAGS_RESOURCES flag we've got a ATTEMPTED_WRITE_TO_READONLY_MEMORY page
* fault. */
priority = NormalPagePriority /*| MdlMappingNoWrite*/;
break; break;
default: default:
@ -712,6 +708,7 @@ static NTSTATUS TunDispatchWrite(_Inout_ TUN_CTX *ctx, _Inout_ IRP *Irp)
nbl->SourceHandle = ctx->MiniportAdapterHandle; nbl->SourceHandle = ctx->MiniportAdapterHandle;
NdisSetNblFlag(nbl, ether_const[idx].nbl_flags); NdisSetNblFlag(nbl, ether_const[idx].nbl_flags);
NdisSetNblFlag(nbl, NDIS_NBL_FLAGS_RECV_READ_ONLY);
NET_BUFFER_LIST_INFO(nbl, NetBufferListFrameType) = (PVOID)ether_const[idx].nbl_proto; NET_BUFFER_LIST_INFO(nbl, NetBufferListFrameType) = (PVOID)ether_const[idx].nbl_proto;
NET_BUFFER_LIST_STATUS(nbl) = NDIS_STATUS_SUCCESS; NET_BUFFER_LIST_STATUS(nbl) = NDIS_STATUS_SUCCESS;
NET_BUFFER_LIST_IRP(nbl) = Irp; NET_BUFFER_LIST_IRP(nbl) = Irp;