From 21713580419427b2d8601e0c41d861e0c83212ac Mon Sep 17 00:00:00 2001
From: Andreas Nordal <andreas_nordal_4@hotmail.com>
Date: Wed, 1 May 2024 14:57:44 +0200
Subject: [PATCH] [1] FreeRTOS_DHCP_utest: Fix systematic memory errors in test
 input

The trivial problem: Screenfuls of misaligned store warnings:

    Store to misaligned address 0x7ffe* for type 'uint32_t',
    which requires 4 byte alignment

I assume there is no reason not to convert these to memcpy.
I have done that when that was the only problem I saw.

The more involved problem: The length fields, buffer sizes and
stop byte (0xFF) offsets have fallen out of maintenance.
This would lead the DHCP option parser under test to read out
of bounds when it overshot the stop byte. Symptom:

    AddressSanitizer: dynamic-stack-buffer-overflow on address 0x7ffc9dfa5c07
    READ of size 1 at 0x7ffc9dfa5c07 thread T0
    #0 0x459a49 in prvProcessDHCPReplies test/unit-test/build/Annexed_TCP_Sources/FreeRTOS_DHCP.c:1310
    #1 0x4526d2 in vHandleWaitingAcknowledge test/unit-test/build/Annexed_TCP_Sources/FreeRTOS_DHCP.c:495
    #2 0x4544ef in vDHCPProcessEndPoint test/unit-test/build/Annexed_TCP_Sources/FreeRTOS_DHCP.c:739
    #3 0x43dbd9 in test_vDHCPProcess_eWaitingAcknowledge_DNSIncorrectLength2
        (test/unit-test/build/bin/tests/FreeRTOS_DHCP_utest+0x43dbd9)

    Address 0x7ffc9dfa5c07 is located in stack of thread T0
    SUMMARY: AddressSanitizer: dynamic-stack-buffer-overflow
        test/unit-test/build/Annexed_TCP_Sources/FreeRTOS_DHCP.c:1310 in prvProcessDHCPReplies
    Shadow bytes around the buggy address:
    0x7ffc9dfa5980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    0x7ffc9dfa5a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    0x7ffc9dfa5a80: 00 00 00 00 00 00 00 00 ca ca ca ca 00 00 00 00
    0x7ffc9dfa5b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    0x7ffc9dfa5b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    =>0x7ffc9dfa5c00:[05]cb cb cb cb cb cb cb 00 00 00 00 00 00 00 00
    0x7ffc9dfa5c80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    0x7ffc9dfa5d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    0x7ffc9dfa5d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    0x7ffc9dfa5e00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    0x7ffc9dfa5e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    Shadow byte legend (one shadow byte represents 8 application bytes):
    Addressable:           00
    Partially addressable: 01 02 03 04 05 06 07
    Left alloca redzone:   ca
    Right alloca redzone:  cb

I think this calls for some helper functions, which I've added.
These eliminate the possibility for such inconsistencies,
drastically cuts down on low-entropy code,
and by wrapping memcpy, also avoids the first problem.
I have done that instead wherever I also saw this kind of inconsistencies.
---
 .../FreeRTOS_DHCP/FreeRTOS_DHCP_utest.c       | 66 +++++++++----------
 1 file changed, 33 insertions(+), 33 deletions(-)

diff --git a/test/unit-test/FreeRTOS_DHCP/FreeRTOS_DHCP_utest.c b/test/unit-test/FreeRTOS_DHCP/FreeRTOS_DHCP_utest.c
index 05939c09e..0a6e24b4d 100644
--- a/test/unit-test/FreeRTOS_DHCP/FreeRTOS_DHCP_utest.c
+++ b/test/unit-test/FreeRTOS_DHCP/FreeRTOS_DHCP_utest.c
@@ -2654,7 +2654,7 @@ void test_vDHCPProcess_eWaitingOfferCorrectDHCPMessageTwoOptionsSendFails( void
     /* Add length. */
     DHCPOption[ 1 ] = 4;
     /* Add the offer byte. */
-    *( ( uint32_t * ) &DHCPOption[ 2 ] ) = DHCPServerAddress;
+    memcpy( &DHCPOption[ 2 ], &DHCPServerAddress, sizeof( DHCPServerAddress ) );
 
 
     /* Put the information in global variables to be returned by
@@ -2751,7 +2751,7 @@ void test_vDHCPProcess_eWaitingOfferCorrectDHCPMessageTwoOptionsSendSucceeds( vo
     /* Add length. */
     DHCPOption[ 1 ] = 4;
     /* Add the offer byte. */
-    *( ( uint32_t * ) &DHCPOption[ 2 ] ) = DHCPServerAddress;
+    memcpy( &DHCPOption[ 2 ], &DHCPServerAddress, sizeof( DHCPServerAddress ) );
 
 
     /* Put the information in global variables to be returned by
@@ -2853,7 +2853,7 @@ void test_vDHCPProcess_eWaitingOfferCorrectDHCPMessageTwoOptionsDHCPHookReturnDe
     /* Add length. */
     DHCPOption[ 1 ] = 4;
     /* Add the offer byte. */
-    *( ( uint32_t * ) &DHCPOption[ 2 ] ) = DHCPServerAddress;
+    memcpy( &DHCPOption[ 2 ], &DHCPServerAddress, sizeof( DHCPServerAddress ) );
 
 
     /* Put the information in global variables to be returned by
@@ -2952,7 +2952,7 @@ void test_vDHCPProcess_eWaitingOfferCorrectDHCPMessageTwoOptionsDHCPHookReturnEr
     /* Add length. */
     DHCPOption[ 1 ] = 4;
     /* Add the offer byte. */
-    *( ( uint32_t * ) &DHCPOption[ 2 ] ) = DHCPServerAddress;
+    memcpy( &DHCPOption[ 2 ], &DHCPServerAddress, sizeof( DHCPServerAddress ) );
 
 
     /* Put the information in global variables to be returned by
@@ -3052,7 +3052,7 @@ void test_vDHCPProcess_eWaitingAcknowledgeTwoOptionsIncorrectServerNoTimeout( vo
     /* Add length. */
     DHCPOption[ 1 ] = 4;
     /* Add the offer byte. */
-    *( ( uint32_t * ) &DHCPOption[ 2 ] ) = DHCPServerAddress;
+    memcpy( &DHCPOption[ 2 ], &DHCPServerAddress, sizeof( DHCPServerAddress ) );
 
     /* Put the information in global variables to be returned by
      * the FreeRTOS_recvrom. */
@@ -3137,7 +3137,7 @@ void test_vDHCPProcess_eWaitingAcknowledgeTwoOptionsIncorrectServerTimeoutGNBfai
     /* Add length. */
     DHCPOption[ 1 ] = 4;
     /* Add the offer byte. */
-    *( ( uint32_t * ) &DHCPOption[ 2 ] ) = DHCPServerAddress;
+    memcpy( &DHCPOption[ 2 ], &DHCPServerAddress, sizeof( DHCPServerAddress ) );
 
     /* Put the information in global variables to be returned by
      * the FreeRTOS_recvrom. */
@@ -3227,7 +3227,7 @@ void test_vDHCPProcess_eWaitingAcknowledgeTwoOptionsIncorrectServerTimeoutGNBSuc
     /* Add length. */
     DHCPOption[ 1 ] = 4;
     /* Add the offer byte. */
-    *( ( uint32_t * ) &DHCPOption[ 2 ] ) = DHCPServerAddress;
+    memcpy( &DHCPOption[ 2 ], &DHCPServerAddress, sizeof( DHCPServerAddress ) );
 
 
     /* Put the information in global variables to be returned by
@@ -3322,7 +3322,7 @@ void test_vDHCPProcess_eWaitingAcknowledgeTwoOptionsIncorrectServerTimeoutPeriod
     /* Add length. */
     DHCPOption[ 1 ] = 4;
     /* Add the offer byte. */
-    *( ( uint32_t * ) &DHCPOption[ 2 ] ) = DHCPServerAddress;
+    memcpy( &DHCPOption[ 2 ], &DHCPServerAddress, sizeof( DHCPServerAddress ) );
 
 
     /* Put the information in global variables to be returned by
@@ -3407,7 +3407,7 @@ void test_vDHCPProcess_eWaitingAcknowledgeTwoOptionsIncorrectServerTimeoutPeriod
     /* Add length. */
     DHCPOption[ 1 ] = 4;
     /* Add the offer byte. */
-    *( ( uint32_t * ) &DHCPOption[ 2 ] ) = DHCPServerAddress;
+    memcpy( &DHCPOption[ 2 ], &DHCPServerAddress, sizeof( DHCPServerAddress ) );
 
 
     /* Put the information in global variables to be returned by
@@ -3493,7 +3493,7 @@ void test_vDHCPProcess_eWaitingAcknowledgeTwoOptionsCorrectServerLeaseTimeZero(
     /* Add length. */
     DHCPOption[ 1 ] = 4;
     /* Add the offer byte. */
-    *( ( uint32_t * ) &DHCPOption[ 2 ] ) = DHCPServerAddress;
+    memcpy( &DHCPOption[ 2 ], &DHCPServerAddress, sizeof( DHCPServerAddress ) );
 
 
     /* Put the information in global variables to be returned by
@@ -3594,7 +3594,7 @@ void test_vDHCPProcess_eWaitingAcknowledgeTwoOptionsCorrectServerLeaseTimeLessTh
     /* Add length. */
     DHCPOption[ 1 ] = 4;
     /* Add the offer byte. */
-    *( ( uint32_t * ) &DHCPOption[ 2 ] ) = DHCPServerAddress;
+    memcpy( &DHCPOption[ 2 ], &DHCPServerAddress, sizeof( DHCPServerAddress ) );
 
 
     /* Put the information in global variables to be returned by
@@ -3693,7 +3693,7 @@ void test_vDHCPProcess_eWaitingAcknowledge_TwoOptions_CorrectServer_AptLeaseTime
     /* Add length. */
     DHCPOption[ 1 ] = 4;
     /* Add the offer byte. */
-    *( ( uint32_t * ) &DHCPOption[ 2 ] ) = DHCPServerAddress;
+    memcpy( &DHCPOption[ 2 ], &DHCPServerAddress, sizeof( DHCPServerAddress ) );
 
 
     /* Put the information in global variables to be returned by
@@ -3791,7 +3791,7 @@ void test_vDHCPProcess_eWaitingAcknowledge_TwoOptions_NACK( void )
     /* Add length. */
     DHCPOption[ 1 ] = 4;
     /* Add the offer byte. */
-    *( ( uint32_t * ) &DHCPOption[ 2 ] ) = DHCPServerAddress;
+    memcpy( &DHCPOption[ 2 ], &DHCPServerAddress, sizeof( DHCPServerAddress ) );
 
 
     /* Put the information in global variables to be returned by
@@ -3878,7 +3878,7 @@ void test_vDHCPProcess_eWaitingAcknowledge_TwoOptions_OFFER( void )
     /* Add length. */
     DHCPOption[ 1 ] = 4;
     /* Add the offer byte. */
-    *( ( uint32_t * ) &DHCPOption[ 2 ] ) = DHCPServerAddress;
+    memcpy( &DHCPOption[ 2 ], &DHCPServerAddress, sizeof( DHCPServerAddress ) );
 
 
     /* Put the information in global variables to be returned by
@@ -3980,7 +3980,7 @@ void test_vDHCPProcess_eWaitingAcknowledge_AllOptionsCorrectLength( void )
     /* Add length. */
     DHCPOption[ 1 ] = 4;
     /* Add the offer byte. */
-    *( ( uint32_t * ) &DHCPOption[ 2 ] ) = DHCPServerAddress;
+    memcpy( &DHCPOption[ 2 ], &DHCPServerAddress, sizeof( DHCPServerAddress ) );
 
     DHCPOption += 6;
     /* Add Message type code. */
@@ -3988,7 +3988,7 @@ void test_vDHCPProcess_eWaitingAcknowledge_AllOptionsCorrectLength( void )
     /* Add length. */
     DHCPOption[ 1 ] = 4;
     /* Add the offer byte. */
-    *( ( uint32_t * ) &DHCPOption[ 2 ] ) = ulSubnetMask;
+    memcpy( &DHCPOption[ 2 ], &ulSubnetMask, sizeof( ulSubnetMask ) );
 
     DHCPOption += 6;
     /* Add Message type code. */
@@ -3996,7 +3996,7 @@ void test_vDHCPProcess_eWaitingAcknowledge_AllOptionsCorrectLength( void )
     /* Add length. */
     DHCPOption[ 1 ] = 4;
     /* Add the offer byte. */
-    *( ( uint32_t * ) &DHCPOption[ 2 ] ) = ulGateway;
+    memcpy( &DHCPOption[ 2 ], &ulGateway, sizeof( ulGateway ) );
 
     DHCPOption += 6;
     /* Add Message type code. */
@@ -4004,7 +4004,7 @@ void test_vDHCPProcess_eWaitingAcknowledge_AllOptionsCorrectLength( void )
     /* Add length. */
     DHCPOption[ 1 ] = 4;
     /* Add the offer byte. */
-    *( ( uint32_t * ) &DHCPOption[ 2 ] ) = ulLeaseTime;
+    memcpy( &DHCPOption[ 2 ], &ulLeaseTime, sizeof( ulLeaseTime ) );
 
     DHCPOption += 6;
     /* Add Message type code. */
@@ -4012,7 +4012,7 @@ void test_vDHCPProcess_eWaitingAcknowledge_AllOptionsCorrectLength( void )
     /* Add length. */
     DHCPOption[ 1 ] = 4;
     /* Add the offer byte. */
-    *( ( uint32_t * ) &DHCPOption[ 2 ] ) = ulDNSServer;
+    memcpy( &DHCPOption[ 2 ], &ulDNSServer, sizeof( ulDNSServer ) );
 
 
     /* Put the information in global variables to be returned by
@@ -4126,7 +4126,7 @@ void test_vDHCPProcess_eWaitingAcknowledge_AllOptionsCorrectLength2( void )
     /* Add length. */
     DHCPOption[ 1 ] = 4;
     /* Add the offer byte. */
-    *( ( uint32_t * ) &DHCPOption[ 2 ] ) = DHCPServerAddress;
+    memcpy( &DHCPOption[ 2 ], &DHCPServerAddress, sizeof( DHCPServerAddress ) );
 
     DHCPOption += 6;
     /* Add Message type code. */
@@ -4134,7 +4134,7 @@ void test_vDHCPProcess_eWaitingAcknowledge_AllOptionsCorrectLength2( void )
     /* Add length. */
     DHCPOption[ 1 ] = 4;
     /* Add the offer byte. */
-    *( ( uint32_t * ) &DHCPOption[ 2 ] ) = ulSubnetMask;
+    memcpy( &DHCPOption[ 2 ], &ulSubnetMask, sizeof( ulSubnetMask ) );
 
     DHCPOption += 6;
     /* Add Message type code. */
@@ -4142,7 +4142,7 @@ void test_vDHCPProcess_eWaitingAcknowledge_AllOptionsCorrectLength2( void )
     /* Add length. */
     DHCPOption[ 1 ] = 4;
     /* Add the offer byte. */
-    *( ( uint32_t * ) &DHCPOption[ 2 ] ) = ulGateway;
+    memcpy( &DHCPOption[ 2 ], &ulGateway, sizeof( ulGateway ) );
 
     DHCPOption += 6;
     /* Add Message type code. */
@@ -4150,7 +4150,7 @@ void test_vDHCPProcess_eWaitingAcknowledge_AllOptionsCorrectLength2( void )
     /* Add length. */
     DHCPOption[ 1 ] = 4;
     /* Add the offer byte. */
-    *( ( uint32_t * ) &DHCPOption[ 2 ] ) = ulLeaseTime;
+    memcpy( &DHCPOption[ 2 ], &ulLeaseTime, sizeof( ulLeaseTime ) );
 
     DHCPOption += 6;
     /* Add Message type code. */
@@ -4158,7 +4158,7 @@ void test_vDHCPProcess_eWaitingAcknowledge_AllOptionsCorrectLength2( void )
     /* Add length. */
     DHCPOption[ 1 ] = 4;
     /* Add the offer byte. */
-    *( ( uint32_t * ) &DHCPOption[ 2 ] ) = ulDNSServer;
+    memcpy( &DHCPOption[ 2 ], &ulDNSServer, sizeof( ulDNSServer ) );
 
 
     /* Put the information in global variables to be returned by
@@ -4273,7 +4273,7 @@ void test_vDHCPProcess_eWaitingAcknowledge_DNSIncorrectLength( void )
     /* Add length. */
     DHCPOption[ 1 ] = 4;
     /* Add the offer byte. */
-    *( ( uint32_t * ) &DHCPOption[ 2 ] ) = DHCPServerAddress;
+    memcpy( &DHCPOption[ 2 ], &DHCPServerAddress, sizeof( DHCPServerAddress ) );
 
     DHCPOption += 6;
     /* Add Message type code. */
@@ -4281,7 +4281,7 @@ void test_vDHCPProcess_eWaitingAcknowledge_DNSIncorrectLength( void )
     /* Add length. */
     DHCPOption[ 1 ] = 4;
     /* Add the offer byte. */
-    *( ( uint32_t * ) &DHCPOption[ 2 ] ) = ulSubnetMask;
+    memcpy( &DHCPOption[ 2 ], &ulSubnetMask, sizeof( ulSubnetMask ) );
 
     DHCPOption += 6;
     /* Add Message type code. */
@@ -4289,7 +4289,7 @@ void test_vDHCPProcess_eWaitingAcknowledge_DNSIncorrectLength( void )
     /* Add length. */
     DHCPOption[ 1 ] = 4;
     /* Add the offer byte. */
-    *( ( uint32_t * ) &DHCPOption[ 2 ] ) = ulGateway;
+    memcpy( &DHCPOption[ 2 ], &ulGateway, sizeof( ulGateway ) );
 
     DHCPOption += 6;
     /* Add Message type code. */
@@ -4297,7 +4297,7 @@ void test_vDHCPProcess_eWaitingAcknowledge_DNSIncorrectLength( void )
     /* Add length. */
     DHCPOption[ 1 ] = 4;
     /* Add the offer byte. */
-    *( ( uint32_t * ) &DHCPOption[ 2 ] ) = ulLeaseTime;
+    memcpy( &DHCPOption[ 2 ], &ulLeaseTime, sizeof( ulLeaseTime ) );
 
     DHCPOption += 6;
     /* Add Message type code. */
@@ -4305,7 +4305,7 @@ void test_vDHCPProcess_eWaitingAcknowledge_DNSIncorrectLength( void )
     /* Add length. */
     DHCPOption[ 1 ] = 3;
     /* Add the offer byte. */
-    *( ( uint32_t * ) &DHCPOption[ 2 ] ) = ulDNSServer;
+    memcpy( &DHCPOption[ 2 ], &ulDNSServer, sizeof( ulDNSServer ) );
 
 
     /* Put the information in global variables to be returned by
@@ -4415,7 +4415,7 @@ void test_vDHCPProcess_eWaitingAcknowledge_DNSServerOverabundance( void )
     /* Add length. */
     DHCPOption[ 1 ] = 4;
     /* Add the offer byte. */
-    *( ( uint32_t * ) &DHCPOption[ 2 ] ) = DHCPServerAddress;
+    memcpy( &DHCPOption[ 2 ], &DHCPServerAddress, sizeof( DHCPServerAddress ) );
 
     DHCPOption += 6;
     /* Add Message type code. */
@@ -4423,7 +4423,7 @@ void test_vDHCPProcess_eWaitingAcknowledge_DNSServerOverabundance( void )
     /* Add length. */
     DHCPOption[ 1 ] = 4;
     /* Add the offer byte. */
-    *( ( uint32_t * ) &DHCPOption[ 2 ] ) = ulSubnetMask;
+    memcpy( &DHCPOption[ 2 ], &ulSubnetMask, sizeof( ulSubnetMask ) );
 
     DHCPOption += 6;
     /* Add Message type code. */
@@ -4431,7 +4431,7 @@ void test_vDHCPProcess_eWaitingAcknowledge_DNSServerOverabundance( void )
     /* Add length. */
     DHCPOption[ 1 ] = 4;
     /* Add the offer byte. */
-    *( ( uint32_t * ) &DHCPOption[ 2 ] ) = ulGateway;
+    memcpy( &DHCPOption[ 2 ], &ulGateway, sizeof( ulGateway ) );
 
     DHCPOption += 6;
     /* Add Message type code. */
@@ -4439,7 +4439,7 @@ void test_vDHCPProcess_eWaitingAcknowledge_DNSServerOverabundance( void )
     /* Add length. */
     DHCPOption[ 1 ] = 4;
     /* Add the offer byte. */
-    *( ( uint32_t * ) &DHCPOption[ 2 ] ) = ulLeaseTime;
+    memcpy( &DHCPOption[ 2 ], &ulLeaseTime, sizeof( ulLeaseTime ) );
 
     DHCPOption += 6;
     /* Add Message type code. */