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NetworkPkg: PxeBcDhcp6GoogleTest: Fix Stack Smashing Unit Test

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PxeBcDhcp6GoogleTest's MultipleDnsEntries test started to fail
with stack cookies added for host applications. Debugging this
showed that the test was attempting to copy two UINT16s to a
UINT8 Data[1] array allocated on the stack. This was moved to
a heap based allocation for a UINT32 to accommodate the proper
size. After this fix, the unit test passed with stack cookies
enabled.

Signed-off-by: Oliver Smith-Denny <osde@linux.microsoft.com>
This commit is contained in:
Oliver Smith-Denny 2024-08-28 09:39:45 -07:00 committed by mergify[bot]
parent 6706fe6e23
commit 837bb62661
1 changed files with 17 additions and 8 deletions
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25
NetworkPkg/UefiPxeBcDxe/GoogleTest/PxeBcDhcp6GoogleTest.cpp
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@ -290,15 +290,9 @@ TEST_F (PxeBcCacheDnsServerAddressesTest, AttemptUnderflowTest) {
// Test Description
// Test that we can handle recursive dns (multiple dns entries)
TEST_F (PxeBcCacheDnsServerAddressesTest, MultipleDnsEntries) {
EFI_DHCP6_PACKET_OPTION Option = { 0 };
EFI_DHCP6_PACKET_OPTION *Option = NULL;
PXEBC_DHCP6_PACKET_CACHE *Cache6 = NULL;
Private.SelectIndex = 1; // SelectIndex is 1-based
Cache6 = &Private.OfferBuffer[Private.SelectIndex - 1].Dhcp6;
Cache6->OptList[PXEBC_DHCP6_IDX_DNS_SERVER] = &Option;
// Setup the DHCPv6 offer packet
Cache6->OptList[PXEBC_DHCP6_IDX_DNS_SERVER]->OpCode = DHCP6_OPT_SERVER_ID;
EFI_IPv6_ADDRESS addresses[2] = {
// 2001:db8:85a3::8a2e:370:7334
{ 0x20, 0x01, 0x0d, 0xb8, 0x85, 0xa3, 0x00, 0x00, 0x00, 0x00, 0x8a, 0x2e, 0x03, 0x70, 0x73, 0x34 },
@ -306,7 +300,18 @@ TEST_F (PxeBcCacheDnsServerAddressesTest, MultipleDnsEntries) {
{ 0xfe, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xd4, 0x78, 0x91, 0xc3, 0xec, 0xd7, 0x4f, 0xf9 }
};
CopyMem (Cache6->OptList[PXEBC_DHCP6_IDX_DNS_SERVER]->Data, &addresses, sizeof (addresses));
Option = (EFI_DHCP6_PACKET_OPTION *)AllocatePool (sizeof (*Option) + sizeof (addresses));
if (Option == NULL) {
ASSERT_NE (Option, nullptr);
}
Private.SelectIndex = 1; // SelectIndex is 1-based
Cache6 = &Private.OfferBuffer[Private.SelectIndex - 1].Dhcp6;
Cache6->OptList[PXEBC_DHCP6_IDX_DNS_SERVER] = Option;
// Setup the DHCPv6 offer packet
Cache6->OptList[PXEBC_DHCP6_IDX_DNS_SERVER]->OpCode = DHCP6_OPT_SERVER_ID;
CopyMem (Cache6->OptList[PXEBC_DHCP6_IDX_DNS_SERVER]->Data, addresses, sizeof (addresses));
Cache6->OptList[PXEBC_DHCP6_IDX_DNS_SERVER]->OpLen = NTOHS (sizeof (addresses));
@ -327,6 +332,10 @@ TEST_F (PxeBcCacheDnsServerAddressesTest, MultipleDnsEntries) {
if (Private.DnsServer) {
FreePool (Private.DnsServer);
}
if (Option) {
FreePool (Option);
}
}
///////////////////////////////////////////////////////////////////////////////