From patchwork Thu May 4 03:54:17 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Biggers X-Patchwork-Id: 13230753 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 455B1C77B7C for ; Thu, 4 May 2023 03:55:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229883AbjEDDzD (ORCPT ); Wed, 3 May 2023 23:55:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56860 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229805AbjEDDy5 (ORCPT ); Wed, 3 May 2023 23:54:57 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9AF931FFF; Wed, 3 May 2023 20:54:52 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 4F46263168; Thu, 4 May 2023 03:54:50 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7A3B1C4339E; Thu, 4 May 2023 03:54:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1683172489; bh=UUdVYK3NIGsNWCXCXmoJWWUaXuVnxz9Eu6l2VyH3l0Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=QEICZO2gxzqGthL+A1161/7Hca7ksKf5i9GWxRNMJd2FPk08niY8XtA7oNQD9wlqd lFUUUsz8LFbwHYv6DC7RGOZrSPWS9+LBkcx13zUQjs+Iwm6ArNFhRjI9WZMaTrcJKC DNf/EC0NIOS9BBOSGTcZ9ggGdFnWBaMtPikBnup1TmGSVRXOrAj+oIvSNY6E137GWN QjQgEBTkhXG4RBW4mN+nTS/TlruUMtqAXGmPCkl2zCxZgoYM4iYeUnsNzQarZwb7/m T3kImZebdCUooLzpFfOFqpMiak/3t9ViCFHJXARZRjPsA1PyPyosxK89Mxr6AVi5RW sb1S6ZNORCH6Q== From: Eric Biggers To: stable@vger.kernel.org Cc: linux-block@vger.kernel.org, Christoph Hellwig , Jens Axboe Subject: [PATCH 6.1 7/7] blk-crypto: make blk_crypto_evict_key() more robust Date: Wed, 3 May 2023 20:54:17 -0700 Message-Id: <20230504035417.61435-8-ebiggers@kernel.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230504035417.61435-1-ebiggers@kernel.org> References: <20230504035417.61435-1-ebiggers@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org From: Eric Biggers commit 5c7cb94452901a93e90c2230632e2c12a681bc92 upstream. If blk_crypto_evict_key() sees that the key is still in-use (due to a bug) or that ->keyslot_evict failed, it currently just returns while leaving the key linked into the keyslot management structures. However, blk_crypto_evict_key() is only called in contexts such as inode eviction where failure is not an option. So actually the caller proceeds with freeing the blk_crypto_key regardless of the return value of blk_crypto_evict_key(). These two assumptions don't match, and the result is that there can be a use-after-free in blk_crypto_reprogram_all_keys() after one of these errors occurs. (Note, these errors *shouldn't* happen; we're just talking about what happens if they do anyway.) Fix this by making blk_crypto_evict_key() unlink the key from the keyslot management structures even on failure. Also improve some comments. Fixes: 1b2628397058 ("block: Keyslot Manager for Inline Encryption") Cc: stable@vger.kernel.org Signed-off-by: Eric Biggers Reviewed-by: Christoph Hellwig Link: https://lore.kernel.org/r/20230315183907.53675-2-ebiggers@kernel.org Signed-off-by: Jens Axboe --- block/blk-crypto-profile.c | 46 +++++++++++++++++--------------------- block/blk-crypto.c | 28 ++++++++++++++++------- 2 files changed, 41 insertions(+), 33 deletions(-) diff --git a/block/blk-crypto-profile.c b/block/blk-crypto-profile.c index 0307fb0d95d34..3290c03c9918d 100644 --- a/block/blk-crypto-profile.c +++ b/block/blk-crypto-profile.c @@ -354,28 +354,16 @@ bool __blk_crypto_cfg_supported(struct blk_crypto_profile *profile, return true; } -/** - * __blk_crypto_evict_key() - Evict a key from a device. - * @profile: the crypto profile of the device - * @key: the key to evict. It must not still be used in any I/O. - * - * If the device has keyslots, this finds the keyslot (if any) that contains the - * specified key and calls the driver's keyslot_evict function to evict it. - * - * Otherwise, this just calls the driver's keyslot_evict function if it is - * implemented, passing just the key (without any particular keyslot). This - * allows layered devices to evict the key from their underlying devices. - * - * Context: Process context. Takes and releases profile->lock. - * Return: 0 on success or if there's no keyslot with the specified key, -EBUSY - * if the keyslot is still in use, or another -errno value on other - * error. +/* + * This is an internal function that evicts a key from an inline encryption + * device that can be either a real device or the blk-crypto-fallback "device". + * It is used only by blk_crypto_evict_key(); see that function for details. */ int __blk_crypto_evict_key(struct blk_crypto_profile *profile, const struct blk_crypto_key *key) { struct blk_crypto_keyslot *slot; - int err = 0; + int err; if (profile->num_slots == 0) { if (profile->ll_ops.keyslot_evict) { @@ -389,22 +377,30 @@ int __blk_crypto_evict_key(struct blk_crypto_profile *profile, blk_crypto_hw_enter(profile); slot = blk_crypto_find_keyslot(profile, key); - if (!slot) - goto out_unlock; + if (!slot) { + /* + * Not an error, since a key not in use by I/O is not guaranteed + * to be in a keyslot. There can be more keys than keyslots. + */ + err = 0; + goto out; + } if (WARN_ON_ONCE(atomic_read(&slot->slot_refs) != 0)) { + /* BUG: key is still in use by I/O */ err = -EBUSY; - goto out_unlock; + goto out_remove; } err = profile->ll_ops.keyslot_evict(profile, key, blk_crypto_keyslot_index(slot)); - if (err) - goto out_unlock; - +out_remove: + /* + * Callers free the key even on error, so unlink the key from the hash + * table and clear slot->key even on error. + */ hlist_del(&slot->hash_node); slot->key = NULL; - err = 0; -out_unlock: +out: blk_crypto_hw_exit(profile); return err; } diff --git a/block/blk-crypto.c b/block/blk-crypto.c index 099381d221542..6733286d506f6 100644 --- a/block/blk-crypto.c +++ b/block/blk-crypto.c @@ -394,15 +394,19 @@ int blk_crypto_start_using_key(struct block_device *bdev, } /** - * blk_crypto_evict_key() - Evict a key from any inline encryption hardware - * it may have been programmed into - * @bdev: The block_device who's associated inline encryption hardware this key - * might have been programmed into - * @key: The key to evict + * blk_crypto_evict_key() - Evict a blk_crypto_key from a block_device + * @bdev: a block_device on which I/O using the key may have been done + * @key: the key to evict * - * Upper layers (filesystems) must call this function to ensure that a key is - * evicted from any hardware that it might have been programmed into. The key - * must not be in use by any in-flight IO when this function is called. + * For a given block_device, this function removes the given blk_crypto_key from + * the keyslot management structures and evicts it from any underlying hardware + * keyslot(s) or blk-crypto-fallback keyslot it may have been programmed into. + * + * Upper layers must call this before freeing the blk_crypto_key. It must be + * called for every block_device the key may have been used on. The key must no + * longer be in use by any I/O when this function is called. + * + * Context: May sleep. */ void blk_crypto_evict_key(struct block_device *bdev, const struct blk_crypto_key *key) @@ -414,6 +418,14 @@ void blk_crypto_evict_key(struct block_device *bdev, err = __blk_crypto_evict_key(q->crypto_profile, key); else err = blk_crypto_fallback_evict_key(key); + /* + * An error can only occur here if the key failed to be evicted from a + * keyslot (due to a hardware or driver issue) or is allegedly still in + * use by I/O (due to a kernel bug). Even in these cases, the key is + * still unlinked from the keyslot management structures, and the caller + * is allowed and expected to free it right away. There's nothing + * callers can do to handle errors, so just log them and return void. + */ if (err) pr_warn_ratelimited("%pg: error %d evicting key\n", bdev, err); }