From: Eric Biggers <ebiggers@xxxxxxxxxx>
All crypto API algorithms are supposed to support the case where they
are called in a context where SIMD instructions are unusable, e.g. IRQ
context on some architectures. However, this isn't tested for by the
self-tests, causing bugs to go undetected.
Now that all algorithms have been converted to use crypto_simd_usable(),
update the self-tests to test the no-SIMD case. First, a bool
testvec_config::nosimd is added. When set, the crypto operation is
executed with preemption disabled and with crypto_simd_usable() mocked
out to return false on the current CPU.
A bool test_sg_division::nosimd is also added. For hash algorithms it's
honored by the corresponding ->update(). By setting just a subset of
these bools, the case where some ->update()s are done in SIMD context
and some are done in no-SIMD context is also tested.
These bools are then randomly set by generate_random_testvec_config().
For now, all no-SIMD testing is limited to the extra crypto self-tests,
because it might be a bit too invasive for the regular self-tests.
But this could be changed later.
This has already found bugs in the arm64 AES-GCM and ChaCha algorithms.
This would have found some past bugs as well.
Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
---
crypto/testmgr.c | 116 +++++++++++++++++++++++++++++++++++++----------
1 file changed, 92 insertions(+), 24 deletions(-)
diff --git a/crypto/testmgr.c b/crypto/testmgr.c
index 52417dde811f..2c2ddebb48d3 100644
--- a/crypto/testmgr.c
+++ b/crypto/testmgr.c
@@ -234,12 +234,14 @@ enum finalization_type {
* @offset
* @flush_type: for hashes, whether an update() should be done now vs.
* continuing to accumulate data
+ * @nosimd: if doing the pending update(), do it with SIMD disabled?
*/
struct test_sg_division {
unsigned int proportion_of_total;
unsigned int offset;
bool offset_relative_to_alignmask;
enum flush_type flush_type;
+ bool nosimd;
};
/**
@@ -259,6 +261,7 @@ struct test_sg_division {
* @iv_offset_relative_to_alignmask: if true, add the algorithm's alignmask to
* the @iv_offset
* @finalization_type: what finalization function to use for hashes
+ * @nosimd: execute with SIMD disabled? Requires !CRYPTO_TFM_REQ_MAY_SLEEP.
*/
struct testvec_config {
const char *name;
@@ -269,6 +272,7 @@ struct testvec_config {
unsigned int iv_offset;
bool iv_offset_relative_to_alignmask;
enum finalization_type finalization_type;
+ bool nosimd;
};
#define TESTVEC_CONFIG_NAMELEN 192
@@ -420,8 +424,11 @@ static unsigned int count_test_sg_divisions(const struct test_sg_division *divs)
return ndivs;
}
+#define SGDIVS_HAVE_FLUSHES BIT(0)
+#define SGDIVS_HAVE_NOSIMD BIT(1)
+
static bool valid_sg_divisions(const struct test_sg_division *divs,
- unsigned int count, bool *any_flushes_ret)
+ unsigned int count, int *flags_ret)
{
unsigned int total = 0;
unsigned int i;
@@ -432,7 +439,9 @@ static bool valid_sg_divisions(const struct test_sg_division *divs,
return false;
total += divs[i].proportion_of_total;
if (divs[i].flush_type != FLUSH_TYPE_NONE)
- *any_flushes_ret = true;
+ *flags_ret |= SGDIVS_HAVE_FLUSHES;
+ if (divs[i].nosimd)
+ *flags_ret |= SGDIVS_HAVE_NOSIMD;
}
return total == TEST_SG_TOTAL &&
memchr_inv(&divs[i], 0, (count - i) * sizeof(divs[0])) == NULL;
@@ -445,19 +454,18 @@ static bool valid_sg_divisions(const struct test_sg_division *divs,
*/
static bool valid_testvec_config(const struct testvec_config *cfg)
{
- bool any_flushes = false;
+ int flags = 0;
if (cfg->name == NULL)
return false;
if (!valid_sg_divisions(cfg->src_divs, ARRAY_SIZE(cfg->src_divs),
- &any_flushes))
+ &flags))
return false;
if (cfg->dst_divs[0].proportion_of_total) {
if (!valid_sg_divisions(cfg->dst_divs,
- ARRAY_SIZE(cfg->dst_divs),
- &any_flushes))
+ ARRAY_SIZE(cfg->dst_divs), &flags))
return false;
} else {
if (memchr_inv(cfg->dst_divs, 0, sizeof(cfg->dst_divs)))
@@ -470,7 +478,12 @@ static bool valid_testvec_config(const struct testvec_config *cfg)
MAX_ALGAPI_ALIGNMASK + 1)
return false;
- if (any_flushes && cfg->finalization_type == FINALIZATION_TYPE_DIGEST)
+ if ((flags & (SGDIVS_HAVE_FLUSHES | SGDIVS_HAVE_NOSIMD)) &&
+ cfg->finalization_type == FINALIZATION_TYPE_DIGEST)
+ return false;
+
+ if ((cfg->nosimd || (flags & SGDIVS_HAVE_NOSIMD)) &&
+ (cfg->req_flags & CRYPTO_TFM_REQ_MAY_SLEEP))
return false;
return true;
@@ -731,13 +744,14 @@ static int build_cipher_test_sglists(struct cipher_test_sglists *tsgls,
#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)
+ bool gen_flushes, u32 req_flags)
{
struct test_sg_division *div = divs;
unsigned int remaining = TEST_SG_TOTAL;
do {
unsigned int this_len;
+ const char *flushtype_str;
if (div == &divs[max_divs - 1] || prandom_u32() % 2 == 0)
this_len = remaining;
@@ -766,11 +780,31 @@ static char *generate_random_sgl_divisions(struct test_sg_division *divs,
}
}
+ if (div->flush_type != FLUSH_TYPE_NONE &&
+ !(req_flags & CRYPTO_TFM_REQ_MAY_SLEEP) &&
+ prandom_u32() % 2 == 0)
+ div->nosimd = true;
+
+ switch (div->flush_type) {
+ case FLUSH_TYPE_FLUSH:
+ if (div->nosimd)
+ flushtype_str = "<flush,nosimd>";
+ else
+ flushtype_str = "<flush>";
+ break;
+ case FLUSH_TYPE_REIMPORT:
+ if (div->nosimd)
+ flushtype_str = "<reimport,nosimd>";
+ else
+ flushtype_str = "<reimport>";
+ break;
+ default:
+ flushtype_str = "";
+ 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> ",
+ p += scnprintf(p, end - p, "%s%u.%u%%@%s+%u%s", flushtype_str,
this_len / 100, this_len % 100,
div->offset_relative_to_alignmask ?
"alignmask" : "",
@@ -820,18 +854,26 @@ static void generate_random_testvec_config(struct testvec_config *cfg,
break;
}
+ if (!(cfg->req_flags & CRYPTO_TFM_REQ_MAY_SLEEP) &&
+ prandom_u32() % 2 == 0) {
+ cfg->nosimd = true;
+ p += scnprintf(p, end - p, " nosimd");
+ }
+
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));
+ FINALIZATION_TYPE_DIGEST),
+ cfg->req_flags);
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, end, false,
+ cfg->req_flags);
p += scnprintf(p, end - p, "]");
}
@@ -864,6 +906,23 @@ static void crypto_reenable_simd_for_test(void)
}
#endif /* !CONFIG_CRYPTO_MANAGER_EXTRA_TESTS */
+static int do_ahash_op(int (*op)(struct ahash_request *req),
+ struct ahash_request *req,
+ struct crypto_wait *wait, bool nosimd)
+{
+ int err;
+
+ if (nosimd)
+ crypto_disable_simd_for_test();
+
+ err = op(req);
+
+ if (nosimd)
+ crypto_reenable_simd_for_test();
+
+ return crypto_wait_req(err, wait);
+}
+
static int check_nonfinal_hash_op(const char *op, int err,
u8 *result, unsigned int digestsize,
const char *driver, unsigned int vec_num,
@@ -938,7 +997,7 @@ static int test_hash_vec_cfg(const char *driver,
ahash_request_set_callback(req, req_flags, crypto_req_done,
&wait);
ahash_request_set_crypt(req, tsgl->sgl, result, vec->psize);
- err = crypto_wait_req(crypto_ahash_digest(req), &wait);
+ err = do_ahash_op(crypto_ahash_digest, req, &wait, cfg->nosimd);
if (err) {
pr_err("alg: hash: %s digest() failed with err %d on test vector %u, cfg=\"%s\"\n",
driver, err, vec_num, cfg->name);
@@ -951,7 +1010,7 @@ static int test_hash_vec_cfg(const char *driver,
ahash_request_set_callback(req, req_flags, crypto_req_done, &wait);
ahash_request_set_crypt(req, NULL, result, 0);
- err = crypto_wait_req(crypto_ahash_init(req), &wait);
+ err = do_ahash_op(crypto_ahash_init, req, &wait, cfg->nosimd);
err = check_nonfinal_hash_op("init", err, result, digestsize,
driver, vec_num, cfg);
if (err)
@@ -967,7 +1026,8 @@ static int test_hash_vec_cfg(const char *driver,
crypto_req_done, &wait);
ahash_request_set_crypt(req, pending_sgl, result,
pending_len);
- err = crypto_wait_req(crypto_ahash_update(req), &wait);
+ err = do_ahash_op(crypto_ahash_update, req, &wait,
+ divs[i]->nosimd);
err = check_nonfinal_hash_op("update", err,
result, digestsize,
driver, vec_num, cfg);
@@ -1010,12 +1070,12 @@ static int test_hash_vec_cfg(const char *driver,
ahash_request_set_crypt(req, pending_sgl, result, pending_len);
if (cfg->finalization_type == FINALIZATION_TYPE_FINAL) {
/* finish with update() and final() */
- err = crypto_wait_req(crypto_ahash_update(req), &wait);
+ err = do_ahash_op(crypto_ahash_update, req, &wait, cfg->nosimd);
err = check_nonfinal_hash_op("update", err, result, digestsize,
driver, vec_num, cfg);
if (err)
return err;
- err = crypto_wait_req(crypto_ahash_final(req), &wait);
+ err = do_ahash_op(crypto_ahash_final, req, &wait, cfg->nosimd);
if (err) {
pr_err("alg: hash: %s final() failed with err %d on test vector %u, cfg=\"%s\"\n",
driver, err, vec_num, cfg->name);
@@ -1023,7 +1083,7 @@ static int test_hash_vec_cfg(const char *driver,
}
} else {
/* finish with finup() */
- err = crypto_wait_req(crypto_ahash_finup(req), &wait);
+ err = do_ahash_op(crypto_ahash_finup, req, &wait, cfg->nosimd);
if (err) {
pr_err("alg: hash: %s finup() failed with err %d on test vector %u, cfg=\"%s\"\n",
driver, err, vec_num, cfg->name);
@@ -1259,8 +1319,12 @@ static int test_aead_vec_cfg(const char *driver, int enc,
aead_request_set_crypt(req, tsgls->src.sgl_ptr, tsgls->dst.sgl_ptr,
enc ? vec->plen : vec->clen, iv);
aead_request_set_ad(req, vec->alen);
- err = crypto_wait_req(enc ? crypto_aead_encrypt(req) :
- crypto_aead_decrypt(req), &wait);
+ if (cfg->nosimd)
+ crypto_disable_simd_for_test();
+ err = enc ? crypto_aead_encrypt(req) : crypto_aead_decrypt(req);
+ if (cfg->nosimd)
+ crypto_reenable_simd_for_test();
+ err = crypto_wait_req(err, &wait);
if (err) {
if (err == -EBADMSG && vec->novrfy)
return 0;
@@ -1594,8 +1658,12 @@ static int test_skcipher_vec_cfg(const char *driver, int enc,
skcipher_request_set_callback(req, req_flags, crypto_req_done, &wait);
skcipher_request_set_crypt(req, tsgls->src.sgl_ptr, tsgls->dst.sgl_ptr,
vec->len, iv);
- err = crypto_wait_req(enc ? crypto_skcipher_encrypt(req) :
- crypto_skcipher_decrypt(req), &wait);
+ if (cfg->nosimd)
+ crypto_disable_simd_for_test();
+ err = enc ? crypto_skcipher_encrypt(req) : crypto_skcipher_decrypt(req);
+ if (cfg->nosimd)
+ crypto_reenable_simd_for_test();
+ err = crypto_wait_req(err, &wait);
if (err) {
pr_err("alg: skcipher: %s %s failed with err %d on test vector %u, cfg=\"%s\"\n",
driver, op, err, vec_num, cfg->name);
--
2.21.0
