malloc: New test to check malloc alternate path using memory obstruction

The test aims to ensure that malloc uses the alternate path to
allocate memory when sbrk() or brk() fails.To achieve this,
the test first creates an obstruction at current program break,
tests that obstruction with a failing sbrk(), then checks if malloc
is still returning a valid ptr thus inferring that malloc() used
mmap() instead of brk() or sbrk() to allocate the memory.
Reviewed-by: Arjun Shankar <arjun@redhat.com>
Reviewed-by: Zack Weinberg <zack@owlfolio.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/malloc/Makefile b/malloc/Makefile
index c1a03f3cb0..cc14cf66c9 100644
--- a/malloc/Makefile
+++ b/malloc/Makefile
@@ -34,6 +34,7 @@ tests := \
   tst-interpose-nothread \
   tst-interpose-thread \
   tst-malloc \
+  tst-malloc-alternate-path \
   tst-malloc-backtrace \
   tst-malloc-check \
   tst-malloc-fork-deadlock \