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MdeModulePkg: Check received packet size before use it.

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Arbitrary length of packet may be received from network, including the
packets with zero payload data or malformed protocol header. So the code
much check the actually received data size before using it. For example, in
current edk2 network stack, an zero payload UDP packet may cause the
platform ASSERT in NetbufFromExt() because of the zero fragment number.
This patch update the IpIoLib and UdpIoLib to check and discard the zero
payload data packet to avoid above assert. Some other network drivers are
also updated to check the packet size to guarantee the minimum length of
protocol header is received from upper layer driver.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Fu Siyuan <siyuan.fu@intel.com>
Reviewed-by: Sriram Subramanian <sriram-s@hpe.com>
Reviewed-by: Wu Jiaxin <jiaxin.wu@intel.com>
This commit is contained in:
Fu Siyuan
2016-03-28 11:00:31 +08:00
parent d9ba76b489
commit 1b31acb66c
5 changed files with 112 additions and 35 deletions
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14
MdeModulePkg/Universal/Network/Tcp4Dxe/Tcp4Input.c
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@@ -1,7 +1,7 @@
/** @file
TCP input process routines.
Copyright (c) 2005 - 2015, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2005 - 2016, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
@@ -711,12 +711,18 @@ TcpInput (
Head = (TCP_HEAD *) NetbufGetByte (Nbuf, 0, NULL);
ASSERT (Head != NULL);
if (Nbuf->TotalSize < sizeof (TCP_HEAD)) {
DEBUG ((EFI_D_INFO, "TcpInput: received a malformed packet\n"));
goto DISCARD;
}
Len = Nbuf->TotalSize - (Head->HeadLen << 2);
if ((Head->HeadLen < 5) || (Len < 0) ||
(TcpChecksum (Nbuf, NetPseudoHeadChecksum (Src, Dst, 6, 0)) != 0)) {
DEBUG ((EFI_D_INFO, "TcpInput: received an mal-formated packet\n"));
DEBUG ((EFI_D_INFO, "TcpInput: received a malformed packet\n"));
goto DISCARD;
}
@@ -1423,6 +1429,10 @@ TcpIcmpInput (
BOOLEAN IcmpErrIsHard;
BOOLEAN IcmpErrNotify;
if (Nbuf->TotalSize < sizeof (TCP_HEAD)) {
goto CLEAN_EXIT;
}
Head = (TCP_HEAD *) NetbufGetByte (Nbuf, 0, NULL);
ASSERT (Head != NULL);
Tcb = TcpLocateTcb (