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when this environment variable is set, talloc will fill freed memory
with the value from that environment variable. This can be used to
help find use after free bugs when valgrind is too slow to be used
when a ptr has a single reference and a NULL parent, then
talloc_free(ptr) is not ambiguous, as the caller could not have done a
talloc_free(NULL) to free the memory
Pair-Programmed-With: Rusty Russell <rusty@samba.org>
If ALWASY_REALLOC is defined and we are to 'shrink' memory block,
memcpy() will write outside memory just allocated.
Signed-off-by: Andrew Tridgell <tridge@samba.org>
When we disable null tracking, we need to move any existing objects
that are under the null_context to be parented by the true NULL
context.
We also need a new talloc_enable_null_tracking_no_autofree() function,
as the talloc testsuite cannot cope with the moving of the autofree
context under the null_context as it wants to check exact counts of
objects under the null_context, and smbtorture has a large number of
objects in the autofree_context from .init functions
It's annoying when you use
p talloc_report_full(ctx, fopen("/tmp/xx","w"))
in gdb, and if you don't have write permission on the file then
you get a segv.
If NULL tracking is enabled after the autofree context is initialised
then autofree ends up separate from the null_context. This means that
talloc_report_full() doesn't report the autofree context. Fix this by
reparenting the autofree context when we create the null_context.
When we get a double free abort from talloc it is often hard to work
out where the first free came from. This patch takes advantage of the
fact that _talloc_free() now takes a location the free was called from
to allow the double free abort code to print the location of the first
free that conflicts.
We also use the major and minor versions in the TALLOC_MAGIC,
so that we can detect if two conflicting versions of talloc
are loaded in one process. In this case we use talloc_log() to
output a very useful debug message before we call
talloc_abort().
metze
These changes follow from the discussions on samba-technical. The
changes are in several parts, and stem from the inherent ambiguity
that was in talloc_free() and talloc_steal() when the pointer that is
being changes has more than one parent, via references.
The changes are:
1) when you call talloc_free() on a pointer with more than one parent
the free will fail, and talloc will log an error to stderr like this:
ERROR: talloc_free with references at some/foo.c:123
reference at other/bar.c:201
reference at other/foobar.c:641
2) Similarly, when you call talloc_steal() on a pointer with more
than one parent, the steal will fail and talloc will log an error to
stderr like this:
ERROR: talloc_steal with references at some/foo.c:123
reference at other/bar.c:201
3) A new function talloc_reparent() has been added to change a parent
in a controlled fashion. You need to supply both the old parent and
the new parent. It handles the case whether either the old parent was
a normal parent or a reference
The use of stderr in the logging is ugly (and potentially dangerous),
and will be removed in a future patch. We'll need to add a debug
registration function to talloc.
