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authorMike Frysinger <vapier@gentoo.org>2007-04-17 11:58:35 +0000
committerMike Frysinger <vapier@gentoo.org>2007-04-17 11:58:35 +0000
commit3a439916d39698cec2cf52f37d3cfb38b0307e58 (patch)
treefca96e79023d8ca086a9537ab8464a8326acd518 /test/malloc/malloc-standard-alignment.c
parent513ea77f25170c75ad1e34719796f7bfd7d285d5 (diff)
catch a small overflow in malloc-standard
Diffstat (limited to 'test/malloc/malloc-standard-alignment.c')
-rw-r--r--test/malloc/malloc-standard-alignment.c42
1 files changed, 42 insertions, 0 deletions
diff --git a/test/malloc/malloc-standard-alignment.c b/test/malloc/malloc-standard-alignment.c
new file mode 100644
index 000000000..1b4c9b8a0
--- /dev/null
+++ b/test/malloc/malloc-standard-alignment.c
@@ -0,0 +1,42 @@
+/* exercise a bug found in malloc-standard when alignment
+ * values are out of whack and cause a small overflow into
+ * actual user data.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+
+#define ok(p) ((void*)p > (void*)0x1000)
+#define x \
+ do { \
+ printf("%i: phead = %p, phead->link @ %p = %p %s\n", \
+ __LINE__, phead, \
+ ok(phead) ? &phead->link : 0, \
+ ok(phead) ? phead->link : 0, \
+ ok(phead) ? phead->link == 0 ? "" : "!!!!!!!!!!!" : ""); \
+ if (phead->link != NULL) exit(1); \
+ } while (0);
+
+struct llist_s {
+ void *data;
+ struct llist_s *link;
+} *phead;
+
+int main()
+{
+ char *line, *reg;
+
+ setbuf(stdout, NULL);
+ setbuf(stderr, NULL);
+
+ phead = malloc(sizeof(*phead));
+ phead->link = NULL;
+
+x line = malloc(80);
+x line = realloc(line, 2);
+x reg = malloc(32);
+x free(line);
+
+x return 0;
+}