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authorHerbert Xu <herbert@gondor.apana.org.au>2020-06-05 16:59:18 +1000
committerHerbert Xu <herbert@gondor.apana.org.au>2020-06-18 17:26:42 +1000
commit3906f640224dbe7714b52b66d7d68c0812808e19 (patch)
tree8a877b2d3f7552a941fbdf453356a34c7127a62c
parent07b048f41ac1222a781573ac1c18592401e4a2a3 (diff)
crc-t10dif: Fix potential crypto notify dead-lock
The crypto notify call occurs with a read mutex held so you must not do any substantial work directly. In particular, you cannot call crypto_alloc_* as they may trigger further notifications which may dead-lock in the presence of another writer. This patch fixes this by postponing the work into a work queue and taking the same lock in the module init function. While we're at it this patch also ensures that all RCU accesses are marked appropriately (tested with sparse). Finally this also reveals a race condition in module param show function as it may be called prior to the module init function. It's fixed by testing whether crct10dif_tfm is NULL (this is true iff the init function has not completed assuming fallback is false). Fixes: 11dcb1037f40 ("crc-t10dif: Allow current transform to be...") Fixes: b76377543b73 ("crc-t10dif: Pick better transform if one...") Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Reviewed-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
-rw-r--r--lib/crc-t10dif.c54
1 files changed, 42 insertions, 12 deletions
diff --git a/lib/crc-t10dif.c b/lib/crc-t10dif.c
index 8cc01a603416..c9acf1c12cfc 100644
--- a/lib/crc-t10dif.c
+++ b/lib/crc-t10dif.c
@@ -19,39 +19,46 @@
static struct crypto_shash __rcu *crct10dif_tfm;
static struct static_key crct10dif_fallback __read_mostly;
static DEFINE_MUTEX(crc_t10dif_mutex);
+static struct work_struct crct10dif_rehash_work;
-static int crc_t10dif_rehash(struct notifier_block *self, unsigned long val, void *data)
+static int crc_t10dif_notify(struct notifier_block *self, unsigned long val, void *data)
{
struct crypto_alg *alg = data;
- struct crypto_shash *new, *old;
if (val != CRYPTO_MSG_ALG_LOADED ||
static_key_false(&crct10dif_fallback) ||
strncmp(alg->cra_name, CRC_T10DIF_STRING, strlen(CRC_T10DIF_STRING)))
return 0;
+ schedule_work(&crct10dif_rehash_work);
+ return 0;
+}
+
+static void crc_t10dif_rehash(struct work_struct *work)
+{
+ struct crypto_shash *new, *old;
+
mutex_lock(&crc_t10dif_mutex);
old = rcu_dereference_protected(crct10dif_tfm,
lockdep_is_held(&crc_t10dif_mutex));
if (!old) {
mutex_unlock(&crc_t10dif_mutex);
- return 0;
+ return;
}
new = crypto_alloc_shash("crct10dif", 0, 0);
if (IS_ERR(new)) {
mutex_unlock(&crc_t10dif_mutex);
- return 0;
+ return;
}
rcu_assign_pointer(crct10dif_tfm, new);
mutex_unlock(&crc_t10dif_mutex);
synchronize_rcu();
crypto_free_shash(old);
- return 0;
}
static struct notifier_block crc_t10dif_nb = {
- .notifier_call = crc_t10dif_rehash,
+ .notifier_call = crc_t10dif_notify,
};
__u16 crc_t10dif_update(__u16 crc, const unsigned char *buffer, size_t len)
@@ -86,19 +93,26 @@ EXPORT_SYMBOL(crc_t10dif);
static int __init crc_t10dif_mod_init(void)
{
+ struct crypto_shash *tfm;
+
+ INIT_WORK(&crct10dif_rehash_work, crc_t10dif_rehash);
crypto_register_notifier(&crc_t10dif_nb);
- crct10dif_tfm = crypto_alloc_shash("crct10dif", 0, 0);
- if (IS_ERR(crct10dif_tfm)) {
+ mutex_lock(&crc_t10dif_mutex);
+ tfm = crypto_alloc_shash("crct10dif", 0, 0);
+ if (IS_ERR(tfm)) {
static_key_slow_inc(&crct10dif_fallback);
- crct10dif_tfm = NULL;
+ tfm = NULL;
}
+ RCU_INIT_POINTER(crct10dif_tfm, tfm);
+ mutex_unlock(&crc_t10dif_mutex);
return 0;
}
static void __exit crc_t10dif_mod_fini(void)
{
crypto_unregister_notifier(&crc_t10dif_nb);
- crypto_free_shash(crct10dif_tfm);
+ cancel_work_sync(&crct10dif_rehash_work);
+ crypto_free_shash(rcu_dereference_protected(crct10dif_tfm, 1));
}
module_init(crc_t10dif_mod_init);
@@ -106,11 +120,27 @@ module_exit(crc_t10dif_mod_fini);
static int crc_t10dif_transform_show(char *buffer, const struct kernel_param *kp)
{
+ struct crypto_shash *tfm;
+ const char *name;
+ int len;
+
if (static_key_false(&crct10dif_fallback))
return sprintf(buffer, "fallback\n");
- return sprintf(buffer, "%s\n",
- crypto_tfm_alg_driver_name(crypto_shash_tfm(crct10dif_tfm)));
+ rcu_read_lock();
+ tfm = rcu_dereference(crct10dif_tfm);
+ if (!tfm) {
+ len = sprintf(buffer, "init\n");
+ goto unlock;
+ }
+
+ name = crypto_tfm_alg_driver_name(crypto_shash_tfm(tfm));
+ len = sprintf(buffer, "%s\n", name);
+
+unlock:
+ rcu_read_unlock();
+
+ return len;
}
module_param_call(transform, NULL, crc_t10dif_transform_show, NULL, 0644);