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crypto: testmgr - implement random testvec_config generation

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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>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Eric Biggers 2019-01-31 23:51:45 -08:00 committed by Herbert Xu
parent 5b2706a4d4
commit 25f9dddb92
1 changed files with 117 additions and 0 deletions
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117
crypto/testmgr.c
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@ -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;