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From: Eric Biggers <ebiggers@kernel.org>
To: linux-fscrypt@vger.kernel.org
Cc: linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org,
	linux-f2fs-devel@lists.sourceforge.net
Subject: [PATCH 3/5] fscrypt: use smp_load_acquire() for ->s_master_keys
Date: Tue, 21 Jul 2020 15:59:18 -0700
Message-ID: <20200721225920.114347-4-ebiggers@kernel.org> (raw)
In-Reply-To: <20200721225920.114347-1-ebiggers@kernel.org>

From: Eric Biggers <ebiggers@google.com>

Normally smp_store_release() or cmpxchg_release() is paired with
smp_load_acquire().  Sometimes smp_load_acquire() can be replaced with
the more lightweight READ_ONCE().  However, for this to be safe, all the
published memory must only be accessed in a way that involves the
pointer itself.  This may not be the case if allocating the object also
involves initializing a static or global variable, for example.

super_block::s_master_keys is a keyring, which is internal to and is
allocated by the keyrings subsystem.  By using READ_ONCE() for it, we're
relying on internal implementation details of the keyrings subsystem.

Remove this fragile assumption by using smp_load_acquire() instead.

(Note: I haven't seen any real-world problems here.  This change is just
fixing the code to be guaranteed correct and less fragile.)

Fixes: 22d94f493bfb ("fscrypt: add FS_IOC_ADD_ENCRYPTION_KEY ioctl")
Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 fs/crypto/keyring.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/fs/crypto/keyring.c b/fs/crypto/keyring.c
index 7f8ac61a20d6..71d56f8e2870 100644
--- a/fs/crypto/keyring.c
+++ b/fs/crypto/keyring.c
@@ -213,7 +213,11 @@ static int allocate_filesystem_keyring(struct super_block *sb)
 	if (IS_ERR(keyring))
 		return PTR_ERR(keyring);
 
-	/* Pairs with READ_ONCE() in fscrypt_find_master_key() */
+	/*
+	 * Pairs with the smp_load_acquire() in fscrypt_find_master_key().
+	 * I.e., here we publish ->s_master_keys with a RELEASE barrier so that
+	 * concurrent tasks can ACQUIRE it.
+	 */
 	smp_store_release(&sb->s_master_keys, keyring);
 	return 0;
 }
@@ -234,8 +238,13 @@ struct key *fscrypt_find_master_key(struct super_block *sb,
 	struct key *keyring;
 	char description[FSCRYPT_MK_DESCRIPTION_SIZE];
 
-	/* pairs with smp_store_release() in allocate_filesystem_keyring() */
-	keyring = READ_ONCE(sb->s_master_keys);
+	/*
+	 * Pairs with the smp_store_release() in allocate_filesystem_keyring().
+	 * I.e., another task can publish ->s_master_keys concurrently,
+	 * executing a RELEASE barrier.  We need to use smp_load_acquire() here
+	 * to safely ACQUIRE the memory the other task published.
+	 */
+	keyring = smp_load_acquire(&sb->s_master_keys);
 	if (keyring == NULL)
 		return ERR_PTR(-ENOKEY); /* No keyring yet, so no keys yet. */
 
-- 
2.27.0


  parent reply index

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-21 22:59 [PATCH 0/5] fscrypt, fs-verity: one-time init fixes Eric Biggers
2020-07-21 22:59 ` [PATCH 1/5] fscrypt: switch fscrypt_do_sha256() to use the SHA-256 library Eric Biggers
2020-07-21 22:59 ` [PATCH 2/5] fscrypt: use smp_load_acquire() for fscrypt_prepared_key Eric Biggers
2020-07-21 22:59 ` Eric Biggers [this message]
2020-07-21 22:59 ` [PATCH 4/5] fscrypt: use smp_load_acquire() for ->i_crypt_info Eric Biggers
2020-07-21 22:59 ` [PATCH 5/5] fs-verity: use smp_load_acquire() for ->i_verity_info Eric Biggers
2020-07-27 16:38 ` [PATCH 0/5] fscrypt, fs-verity: one-time init fixes Eric Biggers

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