dtc: Add valgrind support to testsuite

This patch adds some options to the run_tests.sh script allowing it to
run all the testcases under valgrind to check for pointer corruption
bugs and memory leaks.  Invoking "make checkm" will run the testsuite
with valgrind.

It include a mechanism for specifying valgrind errors to be suppressed
on a per-testcase basis, and adds a couple of such suppression files
for the mangle-layout and open_pack testcases which dump for use by
other testcases a buffer which may contain uninitialized sections.  We
use suppressions rather than initializing the buffer so that valgrind
will catch any internal access s to the uninitialized data, which
would be a bug.

The patch also fixes one genuine bug caught by valgrind -
_packblocks() in fdt_rw.c was using memcpy() where it should have been
using memmove().

At present the valgrinding won't do anything useful for testcases
invoked via a shell script - which includes all the dtc testcases.  I
plan to fix that later.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

1 files changed, 3 insertions, 3 deletions

diff --git a/libfdt/fdt_rw.c b/libfdt/fdt_rw.c
index dfe5628..6673f8e 100644
--- a/libfdt/fdt_rw.c
+++ b/libfdt/fdt_rw.c
@@ -358,12 +358,12 @@ static void _packblocks(const void *fdt, void *buf,
 	memmove(buf + mem_rsv_off, fdt + fdt_off_mem_rsvmap(fdt), mem_rsv_size);
 	fdt_set_off_mem_rsvmap(buf, mem_rsv_off);
 
-	memcpy(buf + struct_off, fdt + fdt_off_dt_struct(fdt), struct_size);
+	memmove(buf + struct_off, fdt + fdt_off_dt_struct(fdt), struct_size);
 	fdt_set_off_dt_struct(buf, struct_off);
 	fdt_set_size_dt_struct(buf, struct_size);
 
-	memcpy(buf + strings_off, fdt + fdt_off_dt_strings(fdt),
-	       fdt_size_dt_strings(fdt));
+	memmove(buf + strings_off, fdt + fdt_off_dt_strings(fdt),
+		fdt_size_dt_strings(fdt));
 	fdt_set_off_dt_strings(buf, strings_off);
 	fdt_set_size_dt_strings(buf, fdt_size_dt_strings(fdt));
 }