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authorHerbert Xu <herbert@gondor.apana.org.au>2008-08-03 21:15:23 +0800
committerHerbert Xu <herbert@gondor.apana.org.au>2008-08-29 15:49:57 +1000
commit73d3864a4823abda19ebc4387b6ddcbf416e3a77 (patch)
tree2939754dc2532f412c34a974e5f22dde112c525d /crypto/api.c
parentda7f033ddc9fdebb3223b0bf88a2a2ab5b797608 (diff)
crypto: api - Use test infrastructure
This patch makes use of the new testing infrastructure by requiring algorithms to pass a run-time test before they're made available to users. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/api.c')
-rw-r--r--crypto/api.c73
1 files changed, 58 insertions, 15 deletions
diff --git a/crypto/api.c b/crypto/api.c
index 0906cedd4521..0444d242e985 100644
--- a/crypto/api.c
+++ b/crypto/api.c
@@ -55,6 +55,11 @@ void crypto_mod_put(struct crypto_alg *alg)
}
EXPORT_SYMBOL_GPL(crypto_mod_put);
+static inline int crypto_is_test_larval(struct crypto_larval *larval)
+{
+ return larval->alg.cra_driver_name[0];
+}
+
static struct crypto_alg *__crypto_alg_lookup(const char *name, u32 type,
u32 mask)
{
@@ -71,6 +76,7 @@ static struct crypto_alg *__crypto_alg_lookup(const char *name, u32 type,
continue;
if (crypto_is_larval(q) &&
+ !crypto_is_test_larval((struct crypto_larval *)q) &&
((struct crypto_larval *)q)->mask != mask)
continue;
@@ -104,10 +110,8 @@ static void crypto_larval_destroy(struct crypto_alg *alg)
kfree(larval);
}
-static struct crypto_alg *crypto_larval_alloc(const char *name, u32 type,
- u32 mask)
+struct crypto_larval *crypto_larval_alloc(const char *name, u32 type, u32 mask)
{
- struct crypto_alg *alg;
struct crypto_larval *larval;
larval = kzalloc(sizeof(*larval), GFP_KERNEL);
@@ -119,10 +123,25 @@ static struct crypto_alg *crypto_larval_alloc(const char *name, u32 type,
larval->alg.cra_priority = -1;
larval->alg.cra_destroy = crypto_larval_destroy;
- atomic_set(&larval->alg.cra_refcnt, 2);
strlcpy(larval->alg.cra_name, name, CRYPTO_MAX_ALG_NAME);
init_completion(&larval->completion);
+ return larval;
+}
+EXPORT_SYMBOL_GPL(crypto_larval_alloc);
+
+static struct crypto_alg *crypto_larval_add(const char *name, u32 type,
+ u32 mask)
+{
+ struct crypto_alg *alg;
+ struct crypto_larval *larval;
+
+ larval = crypto_larval_alloc(name, type, mask);
+ if (IS_ERR(larval))
+ return ERR_CAST(larval);
+
+ atomic_set(&larval->alg.cra_refcnt, 2);
+
down_write(&crypto_alg_sem);
alg = __crypto_alg_lookup(name, type, mask);
if (!alg) {
@@ -152,14 +171,23 @@ EXPORT_SYMBOL_GPL(crypto_larval_kill);
static struct crypto_alg *crypto_larval_wait(struct crypto_alg *alg)
{
struct crypto_larval *larval = (void *)alg;
+ long timeout;
+
+ timeout = wait_for_completion_interruptible_timeout(
+ &larval->completion, 60 * HZ);
- wait_for_completion_interruptible_timeout(&larval->completion, 60 * HZ);
alg = larval->adult;
- if (alg) {
- if (!crypto_mod_get(alg))
- alg = ERR_PTR(-EAGAIN);
- } else
+ if (timeout < 0)
+ alg = ERR_PTR(-EINTR);
+ else if (!timeout)
+ alg = ERR_PTR(-ETIMEDOUT);
+ else if (!alg)
alg = ERR_PTR(-ENOENT);
+ else if (crypto_is_test_larval(larval) &&
+ !(alg->cra_flags & CRYPTO_ALG_TESTED))
+ alg = ERR_PTR(-EAGAIN);
+ else if (!crypto_mod_get(alg))
+ alg = ERR_PTR(-EAGAIN);
crypto_mod_put(&larval->alg);
return alg;
@@ -192,25 +220,40 @@ struct crypto_alg *crypto_larval_lookup(const char *name, u32 type, u32 mask)
if (alg)
return crypto_is_larval(alg) ? crypto_larval_wait(alg) : alg;
- return crypto_larval_alloc(name, type, mask);
+ return crypto_larval_add(name, type, mask);
}
EXPORT_SYMBOL_GPL(crypto_larval_lookup);
+int crypto_probing_notify(unsigned long val, void *v)
+{
+ int ok;
+
+ ok = blocking_notifier_call_chain(&crypto_chain, val, v);
+ if (ok == NOTIFY_DONE) {
+ request_module("cryptomgr");
+ ok = blocking_notifier_call_chain(&crypto_chain, val, v);
+ }
+
+ return ok;
+}
+EXPORT_SYMBOL_GPL(crypto_probing_notify);
+
struct crypto_alg *crypto_alg_mod_lookup(const char *name, u32 type, u32 mask)
{
struct crypto_alg *alg;
struct crypto_alg *larval;
int ok;
+ if (!(mask & CRYPTO_ALG_TESTED)) {
+ type |= CRYPTO_ALG_TESTED;
+ mask |= CRYPTO_ALG_TESTED;
+ }
+
larval = crypto_larval_lookup(name, type, mask);
if (IS_ERR(larval) || !crypto_is_larval(larval))
return larval;
- ok = crypto_notify(CRYPTO_MSG_ALG_REQUEST, larval);
- if (ok == NOTIFY_DONE) {
- request_module("cryptomgr");
- ok = crypto_notify(CRYPTO_MSG_ALG_REQUEST, larval);
- }
+ ok = crypto_probing_notify(CRYPTO_MSG_ALG_REQUEST, larval);
if (ok == NOTIFY_STOP)
alg = crypto_larval_wait(larval);

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