This is a note to let you know that I've just added the patch titled
fscrypto: lock inode while setting encryption policy
to the 4.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
fscrypto-lock-inode-while-setting-encryption-policy.patch
and it can be found in the queue-4.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 8906a8223ad4909b391c5628f7991ebceda30e52 Mon Sep 17 00:00:00 2001
From: Eric Biggers <ebiggers@xxxxxxxxxx>
Date: Sat, 15 Oct 2016 09:48:50 -0400
Subject: fscrypto: lock inode while setting encryption policy
From: Eric Biggers <ebiggers@xxxxxxxxxx>
commit 8906a8223ad4909b391c5628f7991ebceda30e52 upstream.
i_rwsem needs to be acquired while setting an encryption policy so that
concurrent calls to FS_IOC_SET_ENCRYPTION_POLICY are correctly
serialized (especially the ->get_context() + ->set_context() pair), and
so that new files cannot be created in the directory during or after the
->empty_dir() check.
Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Reviewed-by: Richard Weinberger <richard@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/crypto/policy.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/fs/crypto/policy.c
+++ b/fs/crypto/policy.c
@@ -109,6 +109,8 @@ int fscrypt_process_policy(struct file *
if (ret)
return ret;
+ inode_lock(inode);
+
if (!inode_has_encryption_context(inode)) {
if (!S_ISDIR(inode->i_mode))
ret = -EINVAL;
@@ -127,6 +129,8 @@ int fscrypt_process_policy(struct file *
ret = -EINVAL;
}
+ inode_unlock(inode);
+
mnt_drop_write_file(filp);
return ret;
}
Patches currently in stable-queue which might be from ebiggers@xxxxxxxxxx are
queue-4.8/fscrypto-lock-inode-while-setting-encryption-policy.patch
queue-4.8/ext4-do-not-advertise-encryption-support-when-disabled.patch
queue-4.8/fscrypto-make-xts-tweak-initialization-endian-independent.patch
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