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-rw-r--r--regress/unittests/sshbuf/test_sshbuf_fuzz.c132
1 files changed, 132 insertions, 0 deletions
diff --git a/regress/unittests/sshbuf/test_sshbuf_fuzz.c b/regress/unittests/sshbuf/test_sshbuf_fuzz.c
new file mode 100644
index 0000000..e236c82
--- /dev/null
+++ b/regress/unittests/sshbuf/test_sshbuf_fuzz.c
@@ -0,0 +1,132 @@
+/* $OpenBSD: test_sshbuf_fuzz.c,v 1.2 2018/10/17 23:28:05 djm Exp $ */
+/*
+ * Regress test for sshbuf.h buffer API
+ *
+ * Placed in the public domain
+ */
+
+#include "includes.h"
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <stdio.h>
+#ifdef HAVE_STDINT_H
+# include <stdint.h>
+#endif
+#include <stdlib.h>
+#include <string.h>
+
+#include "../test_helper/test_helper.h"
+
+#include "ssherr.h"
+#include "sshbuf.h"
+
+#define NUM_FUZZ_TESTS (1 << 18)
+
+void sshbuf_fuzz_tests(void);
+
+void
+sshbuf_fuzz_tests(void)
+{
+ struct sshbuf *p1;
+ u_char *dp;
+ size_t sz, sz2, i, ntests = NUM_FUZZ_TESTS;
+ u_int32_t r;
+ int ret;
+
+ if (test_is_fast())
+ ntests >>= 2;
+ if (test_is_slow())
+ ntests <<= 2;
+
+ /* NB. uses sshbuf internals */
+ TEST_START("fuzz alloc/dealloc");
+ p1 = sshbuf_new();
+ ASSERT_INT_EQ(sshbuf_set_max_size(p1, 16 * 1024), 0);
+ ASSERT_PTR_NE(p1, NULL);
+ ASSERT_PTR_NE(sshbuf_ptr(p1), NULL);
+ ASSERT_MEM_ZERO_NE(sshbuf_ptr(p1), sshbuf_len(p1));
+ for (i = 0; i < NUM_FUZZ_TESTS; i++) {
+ r = arc4random_uniform(10);
+ if (r == 0) {
+ /* 10% chance: small reserve */
+ r = arc4random_uniform(10);
+ fuzz_reserve:
+ sz = sshbuf_avail(p1);
+ sz2 = sshbuf_len(p1);
+ ret = sshbuf_reserve(p1, r, &dp);
+ if (ret < 0) {
+ ASSERT_PTR_EQ(dp, NULL);
+ ASSERT_SIZE_T_LT(sz, r);
+ ASSERT_SIZE_T_EQ(sshbuf_avail(p1), sz);
+ ASSERT_SIZE_T_EQ(sshbuf_len(p1), sz2);
+ } else {
+ ASSERT_PTR_NE(dp, NULL);
+ ASSERT_SIZE_T_GE(sz, r);
+ ASSERT_SIZE_T_EQ(sshbuf_avail(p1), sz - r);
+ ASSERT_SIZE_T_EQ(sshbuf_len(p1), sz2 + r);
+ memset(dp, arc4random_uniform(255) + 1, r);
+ }
+ } else if (r < 3) {
+ /* 20% chance: big reserve */
+ r = arc4random_uniform(8 * 1024);
+ goto fuzz_reserve;
+ } else if (r == 3) {
+ /* 10% chance: small consume */
+ r = arc4random_uniform(10);
+ fuzz_consume:
+ sz = sshbuf_avail(p1);
+ sz2 = sshbuf_len(p1);
+ /* 50% change consume from end, otherwise start */
+ ret = ((arc4random() & 1) ?
+ sshbuf_consume : sshbuf_consume_end)(p1, r);
+ if (ret < 0) {
+ ASSERT_SIZE_T_LT(sz2, r);
+ ASSERT_SIZE_T_EQ(sshbuf_avail(p1), sz);
+ ASSERT_SIZE_T_EQ(sshbuf_len(p1), sz2);
+ } else {
+ ASSERT_SIZE_T_GE(sz2, r);
+ ASSERT_SIZE_T_EQ(sshbuf_avail(p1), sz + r);
+ ASSERT_SIZE_T_EQ(sshbuf_len(p1), sz2 - r);
+ }
+ } else if (r < 8) {
+ /* 40% chance: big consume */
+ r = arc4random_uniform(2 * 1024);
+ goto fuzz_consume;
+ } else if (r == 8) {
+ /* 10% chance: reset max size */
+ r = arc4random_uniform(16 * 1024);
+ sz = sshbuf_max_size(p1);
+ if (sshbuf_set_max_size(p1, r) < 0)
+ ASSERT_SIZE_T_EQ(sshbuf_max_size(p1), sz);
+ else
+ ASSERT_SIZE_T_EQ(sshbuf_max_size(p1), r);
+ } else {
+ if (arc4random_uniform(8192) == 0) {
+ /* tiny chance: new buffer */
+ ASSERT_PTR_NE(sshbuf_ptr(p1), NULL);
+ ASSERT_MEM_ZERO_NE(sshbuf_ptr(p1), sshbuf_len(p1));
+ sshbuf_free(p1);
+ p1 = sshbuf_new();
+ ASSERT_PTR_NE(p1, NULL);
+ ASSERT_INT_EQ(sshbuf_set_max_size(p1,
+ 16 * 1024), 0);
+ } else {
+ /* Almost 10%: giant reserve */
+ /* use arc4random_buf for r > 2^32 on 64 bit */
+ arc4random_buf(&r, sizeof(r));
+ while (r < SSHBUF_SIZE_MAX / 2) {
+ r <<= 1;
+ r |= arc4random() & 1;
+ }
+ goto fuzz_reserve;
+ }
+ }
+ ASSERT_PTR_NE(sshbuf_ptr(p1), NULL);
+ ASSERT_SIZE_T_LE(sshbuf_max_size(p1), 16 * 1024);
+ }
+ ASSERT_PTR_NE(sshbuf_ptr(p1), NULL);
+ ASSERT_MEM_ZERO_NE(sshbuf_ptr(p1), sshbuf_len(p1));
+ sshbuf_free(p1);
+ TEST_DONE();
+}