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crypto: testmgr - test the !may_use_simd() fallback code
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@google.com> Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Eric Biggers
Herbert Xu
parent
8b8d91d4ce
commit
6570737c7f
116
crypto/testmgr.c
116
crypto/testmgr.c
@ -234,12 +234,14 @@ enum finalization_type {
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* @offset
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* @flush_type: for hashes, whether an update() should be done now vs.
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* continuing to accumulate data
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* @nosimd: if doing the pending update(), do it with SIMD disabled?
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*/
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struct test_sg_division {
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unsigned int proportion_of_total;
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unsigned int offset;
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bool offset_relative_to_alignmask;
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enum flush_type flush_type;
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bool nosimd;
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};
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/**
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@ -259,6 +261,7 @@ struct test_sg_division {
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* @iv_offset_relative_to_alignmask: if true, add the algorithm's alignmask to
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* the @iv_offset
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* @finalization_type: what finalization function to use for hashes
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* @nosimd: execute with SIMD disabled? Requires !CRYPTO_TFM_REQ_MAY_SLEEP.
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*/
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struct testvec_config {
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const char *name;
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@ -269,6 +272,7 @@ struct testvec_config {
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unsigned int iv_offset;
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bool iv_offset_relative_to_alignmask;
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enum finalization_type finalization_type;
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bool nosimd;
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};
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#define TESTVEC_CONFIG_NAMELEN 192
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@ -420,8 +424,11 @@ static unsigned int count_test_sg_divisions(const struct test_sg_division *divs)
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return ndivs;
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}
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#define SGDIVS_HAVE_FLUSHES BIT(0)
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#define SGDIVS_HAVE_NOSIMD BIT(1)
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static bool valid_sg_divisions(const struct test_sg_division *divs,
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unsigned int count, bool *any_flushes_ret)
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unsigned int count, int *flags_ret)
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{
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unsigned int total = 0;
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unsigned int i;
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@ -432,7 +439,9 @@ static bool valid_sg_divisions(const struct test_sg_division *divs,
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return false;
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total += divs[i].proportion_of_total;
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if (divs[i].flush_type != FLUSH_TYPE_NONE)
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*any_flushes_ret = true;
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*flags_ret |= SGDIVS_HAVE_FLUSHES;
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if (divs[i].nosimd)
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*flags_ret |= SGDIVS_HAVE_NOSIMD;
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}
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return total == TEST_SG_TOTAL &&
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memchr_inv(&divs[i], 0, (count - i) * sizeof(divs[0])) == NULL;
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@ -445,19 +454,18 @@ static bool valid_sg_divisions(const struct test_sg_division *divs,
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*/
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static bool valid_testvec_config(const struct testvec_config *cfg)
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{
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bool any_flushes = false;
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int flags = 0;
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if (cfg->name == NULL)
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return false;
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if (!valid_sg_divisions(cfg->src_divs, ARRAY_SIZE(cfg->src_divs),
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&any_flushes))
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&flags))
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return false;
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if (cfg->dst_divs[0].proportion_of_total) {
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if (!valid_sg_divisions(cfg->dst_divs,
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ARRAY_SIZE(cfg->dst_divs),
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&any_flushes))
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ARRAY_SIZE(cfg->dst_divs), &flags))
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return false;
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} else {
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if (memchr_inv(cfg->dst_divs, 0, sizeof(cfg->dst_divs)))
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@ -470,7 +478,12 @@ static bool valid_testvec_config(const struct testvec_config *cfg)
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MAX_ALGAPI_ALIGNMASK + 1)
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return false;
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if (any_flushes && cfg->finalization_type == FINALIZATION_TYPE_DIGEST)
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if ((flags & (SGDIVS_HAVE_FLUSHES | SGDIVS_HAVE_NOSIMD)) &&
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cfg->finalization_type == FINALIZATION_TYPE_DIGEST)
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return false;
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if ((cfg->nosimd || (flags & SGDIVS_HAVE_NOSIMD)) &&
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(cfg->req_flags & CRYPTO_TFM_REQ_MAY_SLEEP))
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return false;
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return true;
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@ -731,13 +744,14 @@ static int build_cipher_test_sglists(struct cipher_test_sglists *tsgls,
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#ifdef CONFIG_CRYPTO_MANAGER_EXTRA_TESTS
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static char *generate_random_sgl_divisions(struct test_sg_division *divs,
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size_t max_divs, char *p, char *end,
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bool gen_flushes)
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bool gen_flushes, u32 req_flags)
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{
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struct test_sg_division *div = divs;
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unsigned int remaining = TEST_SG_TOTAL;
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do {
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unsigned int this_len;
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const char *flushtype_str;
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if (div == &divs[max_divs - 1] || prandom_u32() % 2 == 0)
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this_len = remaining;
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@ -766,11 +780,31 @@ static char *generate_random_sgl_divisions(struct test_sg_division *divs,
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}
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}
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if (div->flush_type != FLUSH_TYPE_NONE &&
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!(req_flags & CRYPTO_TFM_REQ_MAY_SLEEP) &&
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prandom_u32() % 2 == 0)
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div->nosimd = true;
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switch (div->flush_type) {
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case FLUSH_TYPE_FLUSH:
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if (div->nosimd)
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flushtype_str = "<flush,nosimd>";
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else
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flushtype_str = "<flush>";
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break;
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case FLUSH_TYPE_REIMPORT:
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if (div->nosimd)
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flushtype_str = "<reimport,nosimd>";
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else
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flushtype_str = "<reimport>";
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break;
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default:
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flushtype_str = "";
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break;
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}
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BUILD_BUG_ON(TEST_SG_TOTAL != 10000); /* for "%u.%u%%" */
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p += scnprintf(p, end - p, "%s%u.%u%%@%s+%u%s",
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div->flush_type == FLUSH_TYPE_NONE ? "" :
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div->flush_type == FLUSH_TYPE_FLUSH ?
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"<flush> " : "<reimport> ",
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p += scnprintf(p, end - p, "%s%u.%u%%@%s+%u%s", flushtype_str,
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this_len / 100, this_len % 100,
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div->offset_relative_to_alignmask ?
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"alignmask" : "",
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@ -820,18 +854,26 @@ static void generate_random_testvec_config(struct testvec_config *cfg,
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break;
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}
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if (!(cfg->req_flags & CRYPTO_TFM_REQ_MAY_SLEEP) &&
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prandom_u32() % 2 == 0) {
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cfg->nosimd = true;
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p += scnprintf(p, end - p, " nosimd");
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}
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p += scnprintf(p, end - p, " src_divs=[");
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p = generate_random_sgl_divisions(cfg->src_divs,
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ARRAY_SIZE(cfg->src_divs), p, end,
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(cfg->finalization_type !=
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FINALIZATION_TYPE_DIGEST));
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FINALIZATION_TYPE_DIGEST),
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cfg->req_flags);
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p += scnprintf(p, end - p, "]");
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if (!cfg->inplace && prandom_u32() % 2 == 0) {
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p += scnprintf(p, end - p, " dst_divs=[");
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p = generate_random_sgl_divisions(cfg->dst_divs,
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ARRAY_SIZE(cfg->dst_divs),
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p, end, false);
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p, end, false,
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cfg->req_flags);
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p += scnprintf(p, end - p, "]");
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}
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@ -864,6 +906,23 @@ static void crypto_reenable_simd_for_test(void)
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}
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#endif /* !CONFIG_CRYPTO_MANAGER_EXTRA_TESTS */
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static int do_ahash_op(int (*op)(struct ahash_request *req),
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struct ahash_request *req,
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struct crypto_wait *wait, bool nosimd)
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{
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int err;
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if (nosimd)
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crypto_disable_simd_for_test();
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err = op(req);
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if (nosimd)
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crypto_reenable_simd_for_test();
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return crypto_wait_req(err, wait);
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}
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static int check_nonfinal_hash_op(const char *op, int err,
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u8 *result, unsigned int digestsize,
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const char *driver, unsigned int vec_num,
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@ -938,7 +997,7 @@ static int test_hash_vec_cfg(const char *driver,
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ahash_request_set_callback(req, req_flags, crypto_req_done,
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&wait);
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ahash_request_set_crypt(req, tsgl->sgl, result, vec->psize);
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err = crypto_wait_req(crypto_ahash_digest(req), &wait);
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err = do_ahash_op(crypto_ahash_digest, req, &wait, cfg->nosimd);
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if (err) {
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pr_err("alg: hash: %s digest() failed with err %d on test vector %u, cfg=\"%s\"\n",
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driver, err, vec_num, cfg->name);
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@ -951,7 +1010,7 @@ static int test_hash_vec_cfg(const char *driver,
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ahash_request_set_callback(req, req_flags, crypto_req_done, &wait);
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ahash_request_set_crypt(req, NULL, result, 0);
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err = crypto_wait_req(crypto_ahash_init(req), &wait);
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err = do_ahash_op(crypto_ahash_init, req, &wait, cfg->nosimd);
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err = check_nonfinal_hash_op("init", err, result, digestsize,
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driver, vec_num, cfg);
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if (err)
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@ -967,7 +1026,8 @@ static int test_hash_vec_cfg(const char *driver,
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crypto_req_done, &wait);
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ahash_request_set_crypt(req, pending_sgl, result,
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pending_len);
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err = crypto_wait_req(crypto_ahash_update(req), &wait);
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err = do_ahash_op(crypto_ahash_update, req, &wait,
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divs[i]->nosimd);
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err = check_nonfinal_hash_op("update", err,
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result, digestsize,
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driver, vec_num, cfg);
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@ -1010,12 +1070,12 @@ static int test_hash_vec_cfg(const char *driver,
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ahash_request_set_crypt(req, pending_sgl, result, pending_len);
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if (cfg->finalization_type == FINALIZATION_TYPE_FINAL) {
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/* finish with update() and final() */
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err = crypto_wait_req(crypto_ahash_update(req), &wait);
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err = do_ahash_op(crypto_ahash_update, req, &wait, cfg->nosimd);
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err = check_nonfinal_hash_op("update", err, result, digestsize,
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driver, vec_num, cfg);
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if (err)
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return err;
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err = crypto_wait_req(crypto_ahash_final(req), &wait);
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err = do_ahash_op(crypto_ahash_final, req, &wait, cfg->nosimd);
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if (err) {
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pr_err("alg: hash: %s final() failed with err %d on test vector %u, cfg=\"%s\"\n",
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driver, err, vec_num, cfg->name);
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@ -1023,7 +1083,7 @@ static int test_hash_vec_cfg(const char *driver,
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}
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} else {
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/* finish with finup() */
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err = crypto_wait_req(crypto_ahash_finup(req), &wait);
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err = do_ahash_op(crypto_ahash_finup, req, &wait, cfg->nosimd);
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if (err) {
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pr_err("alg: hash: %s finup() failed with err %d on test vector %u, cfg=\"%s\"\n",
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driver, err, vec_num, cfg->name);
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@ -1259,8 +1319,12 @@ static int test_aead_vec_cfg(const char *driver, int enc,
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aead_request_set_crypt(req, tsgls->src.sgl_ptr, tsgls->dst.sgl_ptr,
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enc ? vec->plen : vec->clen, iv);
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aead_request_set_ad(req, vec->alen);
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err = crypto_wait_req(enc ? crypto_aead_encrypt(req) :
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crypto_aead_decrypt(req), &wait);
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if (cfg->nosimd)
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crypto_disable_simd_for_test();
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err = enc ? crypto_aead_encrypt(req) : crypto_aead_decrypt(req);
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if (cfg->nosimd)
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crypto_reenable_simd_for_test();
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err = crypto_wait_req(err, &wait);
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if (err) {
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if (err == -EBADMSG && vec->novrfy)
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return 0;
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@ -1594,8 +1658,12 @@ static int test_skcipher_vec_cfg(const char *driver, int enc,
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skcipher_request_set_callback(req, req_flags, crypto_req_done, &wait);
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skcipher_request_set_crypt(req, tsgls->src.sgl_ptr, tsgls->dst.sgl_ptr,
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vec->len, iv);
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err = crypto_wait_req(enc ? crypto_skcipher_encrypt(req) :
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crypto_skcipher_decrypt(req), &wait);
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if (cfg->nosimd)
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crypto_disable_simd_for_test();
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err = enc ? crypto_skcipher_encrypt(req) : crypto_skcipher_decrypt(req);
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if (cfg->nosimd)
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crypto_reenable_simd_for_test();
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err = crypto_wait_req(err, &wait);
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if (err) {
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pr_err("alg: skcipher: %s %s failed with err %d on test vector %u, cfg=\"%s\"\n",
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driver, op, err, vec_num, cfg->name);
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