[PATCH] crypto: testmgr - reduce stack usage in fuzzers
From: Arnd Bergmann
Date: Mon Jun 17 2019 - 09:29:03 EST
On arm32, we get warnings about high stack usage in some of the functions:
crypto/testmgr.c:2269:12: error: stack frame size of 1032 bytes in function 'alg_test_aead' [-Werror,-Wframe-larger-than=]
static int alg_test_aead(const struct alg_test_desc *desc, const char *driver,
^
crypto/testmgr.c:1693:12: error: stack frame size of 1312 bytes in function '__alg_test_hash' [-Werror,-Wframe-larger-than=]
static int __alg_test_hash(const struct hash_testvec *vecs,
^
On of the larger objects on the stack here is struct testvec_config, so
change that to dynamic allocation.
Fixes: 40153b10d91c ("crypto: testmgr - fuzz AEADs against their generic implementation")
Fixes: d435e10e67be ("crypto: testmgr - fuzz skciphers against their generic implementation")
Fixes: 9a8a6b3f0950 ("crypto: testmgr - fuzz hashes against their generic implementation")
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
---
I only compile-tested this, and it's not completely trivial, so please
review carefully.
---
crypto/testmgr.c | 61 +++++++++++++++++++++++++++++++++++-------------
1 file changed, 45 insertions(+), 16 deletions(-)
diff --git a/crypto/testmgr.c b/crypto/testmgr.c
index 6c28055d41ca..7928296cdcb3 100644
--- a/crypto/testmgr.c
+++ b/crypto/testmgr.c
@@ -1503,13 +1503,15 @@ static int test_hash_vec(const char *driver, const struct hash_testvec *vec,
* Generate a hash test vector from the given implementation.
* Assumes the buffers in 'vec' were already allocated.
*/
-static void generate_random_hash_testvec(struct crypto_shash *tfm,
+static int generate_random_hash_testvec(struct crypto_shash *tfm,
struct hash_testvec *vec,
unsigned int maxkeysize,
unsigned int maxdatasize,
char *name, size_t max_namelen)
{
- SHASH_DESC_ON_STACK(desc, tfm);
+ struct shash_desc *desc = kmalloc(sizeof(*desc) + crypto_shash_descsize(tfm), GFP_KERNEL);
+ if (!desc)
+ return -ENOMEM;
/* Data */
vec->psize = generate_random_length(maxdatasize);
@@ -1541,6 +1543,10 @@ static void generate_random_hash_testvec(struct crypto_shash *tfm,
done:
snprintf(name, max_namelen, "\"random: psize=%u ksize=%u\"",
vec->psize, vec->ksize);
+
+ kfree(desc);
+
+ return 0;
}
/*
@@ -1565,7 +1571,7 @@ static int test_hash_vs_generic_impl(const char *driver,
unsigned int i;
struct hash_testvec vec = { 0 };
char vec_name[64];
- struct testvec_config cfg;
+ struct testvec_config *cfg;
char cfgname[TESTVEC_CONFIG_NAMELEN];
int err;
@@ -1595,6 +1601,12 @@ static int test_hash_vs_generic_impl(const char *driver,
return err;
}
+ cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
+ if (!cfg) {
+ err = -ENOMEM;
+ goto out;
+ }
+
/* Check the algorithm properties for consistency. */
if (digestsize != crypto_shash_digestsize(generic_tfm)) {
@@ -1626,12 +1638,14 @@ static int test_hash_vs_generic_impl(const char *driver,
}
for (i = 0; i < fuzz_iterations * 8; i++) {
- generate_random_hash_testvec(generic_tfm, &vec,
- maxkeysize, maxdatasize,
- vec_name, sizeof(vec_name));
- generate_random_testvec_config(&cfg, cfgname, sizeof(cfgname));
+ err = generate_random_hash_testvec(generic_tfm, &vec,
+ maxkeysize, maxdatasize,
+ vec_name, sizeof(vec_name));
+ if (err)
+ goto out;
+ generate_random_testvec_config(cfg, cfgname, sizeof(cfgname));
- err = test_hash_vec_cfg(driver, &vec, vec_name, &cfg,
+ err = test_hash_vec_cfg(driver, &vec, vec_name, cfg,
req, desc, tsgl, hashstate);
if (err)
goto out;
@@ -1639,6 +1653,7 @@ static int test_hash_vs_generic_impl(const char *driver,
}
err = 0;
out:
+ kfree(cfg);
kfree(vec.key);
kfree(vec.plaintext);
kfree(vec.digest);
@@ -2135,7 +2150,7 @@ static int test_aead_vs_generic_impl(const char *driver,
unsigned int i;
struct aead_testvec vec = { 0 };
char vec_name[64];
- struct testvec_config cfg;
+ struct testvec_config *cfg;
char cfgname[TESTVEC_CONFIG_NAMELEN];
int err;
@@ -2165,6 +2180,12 @@ static int test_aead_vs_generic_impl(const char *driver,
return err;
}
+ cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
+ if (!cfg) {
+ err = -ENOMEM;
+ goto out;
+ }
+
generic_req = aead_request_alloc(generic_tfm, GFP_KERNEL);
if (!generic_req) {
err = -ENOMEM;
@@ -2219,13 +2240,13 @@ static int test_aead_vs_generic_impl(const char *driver,
generate_random_aead_testvec(generic_req, &vec,
maxkeysize, maxdatasize,
vec_name, sizeof(vec_name));
- generate_random_testvec_config(&cfg, cfgname, sizeof(cfgname));
+ generate_random_testvec_config(cfg, cfgname, sizeof(cfgname));
- err = test_aead_vec_cfg(driver, ENCRYPT, &vec, vec_name, &cfg,
+ err = test_aead_vec_cfg(driver, ENCRYPT, &vec, vec_name, cfg,
req, tsgls);
if (err)
goto out;
- err = test_aead_vec_cfg(driver, DECRYPT, &vec, vec_name, &cfg,
+ err = test_aead_vec_cfg(driver, DECRYPT, &vec, vec_name, cfg,
req, tsgls);
if (err)
goto out;
@@ -2233,6 +2254,7 @@ static int test_aead_vs_generic_impl(const char *driver,
}
err = 0;
out:
+ kfree(cfg);
kfree(vec.key);
kfree(vec.iv);
kfree(vec.assoc);
@@ -2682,7 +2704,7 @@ static int test_skcipher_vs_generic_impl(const char *driver,
unsigned int i;
struct cipher_testvec vec = { 0 };
char vec_name[64];
- struct testvec_config cfg;
+ struct testvec_config *cfg;
char cfgname[TESTVEC_CONFIG_NAMELEN];
int err;
@@ -2716,6 +2738,12 @@ static int test_skcipher_vs_generic_impl(const char *driver,
return err;
}
+ cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
+ if (!cfg) {
+ err = -ENOMEM;
+ goto out;
+ }
+
generic_req = skcipher_request_alloc(generic_tfm, GFP_KERNEL);
if (!generic_req) {
err = -ENOMEM;
@@ -2763,20 +2791,21 @@ static int test_skcipher_vs_generic_impl(const char *driver,
for (i = 0; i < fuzz_iterations * 8; i++) {
generate_random_cipher_testvec(generic_req, &vec, maxdatasize,
vec_name, sizeof(vec_name));
- generate_random_testvec_config(&cfg, cfgname, sizeof(cfgname));
+ generate_random_testvec_config(cfg, cfgname, sizeof(cfgname));
err = test_skcipher_vec_cfg(driver, ENCRYPT, &vec, vec_name,
- &cfg, req, tsgls);
+ cfg, req, tsgls);
if (err)
goto out;
err = test_skcipher_vec_cfg(driver, DECRYPT, &vec, vec_name,
- &cfg, req, tsgls);
+ cfg, req, tsgls);
if (err)
goto out;
cond_resched();
}
err = 0;
out:
+ kfree(cfg);
kfree(vec.key);
kfree(vec.iv);
kfree(vec.ptext);
--
2.20.0