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crypto: api - Do not wait for tests during registration

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As registration is usually carried out during module init, this
is a context where as little work as possible should be carried
out.  Testing may trigger module loads of underlying components,
which could even lead back to the module that is registering at
the moment.  This may lead to dead-locks outside of the Crypto API.

Avoid this by not waiting for the tests to complete.  They will
be scheduled but completion will be asynchronous.  Any users will
still wait for completion.

Reported-by: Russell King <linux@armlinux.org.uk>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu
2024-08-17 14:57:40 +08:00
parent 96ad595520
commit 37da5d0ffa
3 changed files with 34 additions and 33 deletions
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41
crypto/api.c
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@@ -154,32 +154,31 @@ static struct crypto_alg *crypto_larval_add(const char *name, u32 type,
return alg;
}
void crypto_larval_kill(struct crypto_alg *alg)
static void crypto_larval_kill(struct crypto_larval *larval)
{
struct crypto_larval *larval = (void *)alg;
bool unlinked;
down_write(&crypto_alg_sem);
list_del(&alg->cra_list);
unlinked = list_empty(&larval->alg.cra_list);
if (!unlinked)
list_del_init(&larval->alg.cra_list);
up_write(&crypto_alg_sem);
complete_all(&larval->completion);
crypto_alg_put(alg);
}
EXPORT_SYMBOL_GPL(crypto_larval_kill);
void crypto_wait_for_test(struct crypto_larval *larval)
if (unlinked)
return;
complete_all(&larval->completion);
crypto_alg_put(&larval->alg);
}
void crypto_schedule_test(struct crypto_larval *larval)
{
int err;
err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
if (WARN_ON_ONCE(err != NOTIFY_STOP))
goto out;
err = wait_for_completion_killable(&larval->completion);
WARN_ON(err);
out:
crypto_larval_kill(&larval->alg);
WARN_ON_ONCE(err != NOTIFY_STOP);
}
EXPORT_SYMBOL_GPL(crypto_wait_for_test);
EXPORT_SYMBOL_GPL(crypto_schedule_test);
static void crypto_start_test(struct crypto_larval *larval)
{
@@ -198,7 +197,7 @@ static void crypto_start_test(struct crypto_larval *larval)
larval->test_started = true;
up_write(&crypto_alg_sem);
crypto_wait_for_test(larval);
crypto_schedule_test(larval);
}
static struct crypto_alg *crypto_larval_wait(struct crypto_alg *alg)
@@ -218,9 +217,11 @@ again:
alg = larval->adult;
if (time_left < 0)
alg = ERR_PTR(-EINTR);
else if (!time_left)
else if (!time_left) {
if (crypto_is_test_larval(larval))
crypto_larval_kill(larval);
alg = ERR_PTR(-ETIMEDOUT);
else if (!alg) {
} else if (!alg) {
u32 type;
u32 mask;
@@ -355,7 +356,7 @@ struct crypto_alg *crypto_alg_mod_lookup(const char *name, u32 type, u32 mask)
crypto_mod_put(larval);
alg = ERR_PTR(-ENOENT);
}
crypto_larval_kill(larval);
crypto_larval_kill(container_of(larval, struct crypto_larval, alg));
return alg;
}
EXPORT_SYMBOL_GPL(crypto_alg_mod_lookup);