MINOR: pools: implement DEBUG_UAF to detect use after free
This code has been used successfully a few times in the past to detect
that a pool was used after being freed. Its main goal is to allocate a
full page for each object so that they are always released individually
and unmapped from memory. This way if any part of the code reference the
object after is was freed and before it is reallocated, a segv occurs at
the exact offending location. It does a few extra things such as writing
to the memory area before freeing to detect double-frees and free of
read-only areas, and placing the data at the end of the page instead of
the beginning so that out of bounds accesses are easier to spot. The
amount of memory used with this is huge (about 10 times the regular
usage) but it can be useful sometimes.
diff --git a/Makefile b/Makefile
index 65e305f..830306e 100644
--- a/Makefile
+++ b/Makefile
@@ -167,8 +167,8 @@
#### Debug settings
# You can enable debugging on specific code parts by setting DEBUG=-DDEBUG_xxx.
# Currently defined DEBUG macros include DEBUG_FULL, DEBUG_MEMORY, DEBUG_FSM,
-# DEBUG_HASH, DEBUG_AUTH, DEBUG_SPOE and DEBUG_THREAD. Please check sources for
-# exact meaning or do not use at all.
+# DEBUG_HASH, DEBUG_AUTH, DEBUG_SPOE, DEBUG_UAF and DEBUG_THREAD. Please check
+# sources for exact meaning or do not use at all.
DEBUG =
#### Trace options