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Subject[RFC/RFT PATCH 10/15] crypto: testmgr - implement random testvec_config generation
Date
From: Eric Biggers <ebiggers@google.com>

Add functions that generate a random testvec_config, in preparation for
using it for randomized fuzz tests.

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
crypto/testmgr.c | 117 +++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 117 insertions(+)

diff --git a/crypto/testmgr.c b/crypto/testmgr.c
index 7c68b4101bd0..ccc0e18b13ea 100644
--- a/crypto/testmgr.c
+++ b/crypto/testmgr.c
@@ -28,6 +28,7 @@
#include <linux/fips.h>
#include <linux/module.h>
#include <linux/once.h>
+#include <linux/random.h>
#include <linux/scatterlist.h>
#include <linux/slab.h>
#include <linux/string.h>
@@ -603,6 +604,122 @@ static int build_cipher_test_sglists(struct cipher_test_sglists *tsgls,
alignmask, dst_total_len, NULL, NULL);
}

+#ifdef CONFIG_CRYPTO_MANAGER_EXTRA_TESTS
+static char *generate_random_sgl_divisions(struct test_sg_division *divs,
+ size_t max_divs, char *p, char *end,
+ bool gen_flushes)
+{
+ struct test_sg_division *div = divs;
+ unsigned int remaining = TEST_SG_TOTAL;
+
+ do {
+ unsigned int this_len;
+
+ if (div == &divs[max_divs - 1] || prandom_u32() % 2 != 0)
+ this_len = remaining;
+ else
+ this_len = 1 + (prandom_u32() % remaining);
+ div->proportion_of_total = this_len;
+
+ if (prandom_u32() % 4 == 0)
+ div->offset = (PAGE_SIZE - 128) + (prandom_u32() % 128);
+ else if (prandom_u32() % 2 == 0)
+ div->offset = prandom_u32() % 32;
+ else
+ div->offset = prandom_u32() % PAGE_SIZE;
+ if (prandom_u32() % 8 == 0)
+ div->offset_relative_to_alignmask = true;
+
+ div->flush_type = FLUSH_TYPE_NONE;
+ if (gen_flushes) {
+ switch (prandom_u32() % 4) {
+ case 0:
+ div->flush_type = FLUSH_TYPE_REIMPORT;
+ break;
+ case 1:
+ div->flush_type = FLUSH_TYPE_FLUSH;
+ break;
+ }
+ }
+
+ BUILD_BUG_ON(TEST_SG_TOTAL != 10000); /* for "%u.%u%%" */
+ p += scnprintf(p, end - p, "%s%u.%u%%@%s+%u%s",
+ div->flush_type == FLUSH_TYPE_NONE ? "" :
+ div->flush_type == FLUSH_TYPE_FLUSH ?
+ "<flush> " : "<reimport> ",
+ this_len / 100, this_len % 100,
+ div->offset_relative_to_alignmask ?
+ "alignmask" : "",
+ div->offset, this_len == remaining ? "" : ", ");
+ remaining -= this_len;
+ div++;
+ } while (remaining);
+
+ return p;
+}
+
+/* Generate a random testvec_config for fuzz testing */
+static void generate_random_testvec_config(struct testvec_config *cfg,
+ char *name, size_t max_namelen)
+{
+ char *p = name;
+ char * const end = name + max_namelen;
+
+ memset(cfg, 0, sizeof(*cfg));
+
+ cfg->name = name;
+
+ p += scnprintf(p, end - p, "random:");
+
+ if (prandom_u32() % 2 == 0) {
+ cfg->inplace = true;
+ p += scnprintf(p, end - p, " inplace");
+ }
+
+ if (prandom_u32() % 2 == 0) {
+ cfg->req_flags |= CRYPTO_TFM_REQ_MAY_SLEEP;
+ p += scnprintf(p, end - p, " may_sleep");
+ }
+
+ switch (prandom_u32() % 4) {
+ case 0:
+ cfg->finalization_type = FINALIZATION_TYPE_FINAL;
+ p += scnprintf(p, end - p, " use_final");
+ break;
+ case 1:
+ cfg->finalization_type = FINALIZATION_TYPE_FINUP;
+ p += scnprintf(p, end - p, " use_finup");
+ break;
+ default:
+ cfg->finalization_type = FINALIZATION_TYPE_DIGEST;
+ p += scnprintf(p, end - p, " use_digest");
+ break;
+ }
+
+ p += scnprintf(p, end - p, " src_divs=[");
+ p = generate_random_sgl_divisions(cfg->src_divs,
+ ARRAY_SIZE(cfg->src_divs), p, end,
+ (cfg->finalization_type !=
+ FINALIZATION_TYPE_DIGEST));
+ p += scnprintf(p, end - p, "]");
+
+ if (!cfg->inplace && prandom_u32() % 2 == 0) {
+ p += scnprintf(p, end - p, " dst_divs=[");
+ p = generate_random_sgl_divisions(cfg->dst_divs,
+ ARRAY_SIZE(cfg->dst_divs),
+ p, end, false);
+ p += scnprintf(p, end - p, "]");
+ }
+
+ if (prandom_u32() % 2 == 0) {
+ cfg->iv_offset = 1 + (prandom_u32() % MAX_ALGAPI_ALIGNMASK);
+ p += scnprintf(p, end - p, " iv_offset=%u", cfg->iv_offset);
+ }
+
+ WARN_ON_ONCE(!valid_testvec_config(cfg));
+}
+#endif /* CONFIG_CRYPTO_MANAGER_EXTRA_TESTS */
+
static int ahash_guard_result(char *result, char c, int size)
{
int i;
--
2.20.1.321.g9e740568ce-goog
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