memset_track

For debugging some simple memory problom cause by memset or memcpy. This is just a simple way to tracking memory problom without ASAN.

Usage

1. Register the memory region you want to tracking in your product.

   uint8_t tracked_mem[16];
   
   memset_track_register("test1", (uintptr_t)&tracked_mem, sizeof(tracked_mem));

   If you did not want to track it anymore, you could unregister it.

   memset_track_unregister((uintptr_t)&tracked_mem);

2. Build this GCC Plugin memset_track_plugin

   # Just run make, or modify Makefile for your custem gcc build.
   $ make

   If it works, you will got a memset_track_plugin.so in target dir

3. Compile your product with GCC Plugin memset_track_plugin

   # Just add param to your gcc
   -fplugin=$(YOUR_CUSTEM_PATH)/memset_track_plugin.so
   

Example

shell$ make example
gcc -O0 -o target/example/example1 example/example1.c \
        -fplugin=target/memset_track_plugin.so \
        -fplugin-arg-memset_track_plugin-verbose \
        -I./include \
        -rdynamic
===> [MEMSET_TRACKING] start, rewriting the AST node...
Before: 
# .MEM_14 = VDEF <.MEM_13>
memset_s (&buf, 18, 0, 18);

After: 
# .MEM_14 = VDEF <.MEM_13>
memset_track_s (&buf, 18, 0, 18);
<=== [MEMSET_TRACKING] finish.
redirect memset_s to memset_track_s in main()

shell$ ./target/example/example1
ERROR: memset_s overlaps the memory [tracked_mem] at IP = 0x5a234d6706b1
./target/example/example1(print_stack_trace+0x49)[0x5a234d67047d]
./target/example/example1(memset_track_s+0xd6)[0x5a234d670614]
./target/example/example1(main+0x51)[0x5a234d6706b1]
/lib/x86_64-linux-gnu/libc.so.6(+0x29d90)[0x74d230229d90]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0x80)[0x74d230229e40]
./target/example/example1(_start+0x25)[0x5a234d670185]
buf:         fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe 
tracked_mem: fe fe 00 00 00 00 00 00 00 00 00 00 00 00 00 00