From: Sweet Tea Dorminy <sweettea-kernel@dorminy.me>
To: "Theodore Y. Ts'o" <tytso@mit.edu>,
Jaegeuk Kim <jaegeuk@kernel.org>,
Eric Biggers <ebiggers@kernel.org>, Chris Mason <clm@fb.com>,
Josef Bacik <josef@toxicpanda.com>,
David Sterba <dsterba@suse.com>,
linux-fscrypt@vger.kernel.org, linux-btrfs@vger.kernel.org,
kernel-team@meta.com
Cc: Omar Sandoval <osandov@osandov.com>,
Sweet Tea Dorminy <sweettea-kernel@dorminy.me>
Subject: [PATCH v3 02/22] fscrypt: add fscrypt_have_same_policy() to check inode compatibility
Date: Thu, 20 Oct 2022 12:58:21 -0400 [thread overview]
Message-ID: <48538f6e8b733d4e273510491a40a162545a7300.1666281277.git.sweettea-kernel@dorminy.me> (raw)
In-Reply-To: <cover.1666281276.git.sweettea-kernel@dorminy.me>
From: Omar Sandoval <osandov@osandov.com>
Btrfs will need to check whether inode policies are identical for
various purposes: if two inodes want to share an extent, they must have
the same policy, including key identifier; symlinks must not span the
encrypted/unencrypted border; and certain encryption policies will allow
btrfs to store one fscrypt_context for multiple objects. Therefore, add
a function which allows checking the encryption policies of two inodes
to ensure they are identical.
Signed-off-by: Omar Sandoval <osandov@osandov.com>
Signed-off-by: Sweet Tea Dorminy <sweettea-kernel@dorminy.me>
---
fs/crypto/policy.c | 26 ++++++++++++++++++++++++++
include/linux/fscrypt.h | 7 +++++++
2 files changed, 33 insertions(+)
diff --git a/fs/crypto/policy.c b/fs/crypto/policy.c
index 46757c3052ef..b7c4820a8001 100644
--- a/fs/crypto/policy.c
+++ b/fs/crypto/policy.c
@@ -415,6 +415,32 @@ static int fscrypt_get_policy(struct inode *inode, union fscrypt_policy *policy)
return fscrypt_policy_from_context(policy, &ctx, ret);
}
+/**
+ * fscrypt_have_same_policy() - check whether two inodes have the same policy
+ * @inode1: the first inode
+ * @inode2: the second inode
+ *
+ * Return: %true if they are definitely equal, else %false
+ */
+int fscrypt_have_same_policy(struct inode *inode1, struct inode *inode2)
+{
+ union fscrypt_policy policy1, policy2;
+ int err;
+
+ if (!IS_ENCRYPTED(inode1) && !IS_ENCRYPTED(inode2))
+ return true;
+ else if (!IS_ENCRYPTED(inode1) || !IS_ENCRYPTED(inode2))
+ return false;
+ err = fscrypt_get_policy(inode1, &policy1);
+ if (err)
+ return false;
+ err = fscrypt_get_policy(inode2, &policy2);
+ if (err)
+ return false;
+ return fscrypt_policies_equal(&policy1, &policy2);
+}
+EXPORT_SYMBOL(fscrypt_have_same_policy);
+
static int set_encryption_policy(struct inode *inode,
const union fscrypt_policy *policy)
{
diff --git a/include/linux/fscrypt.h b/include/linux/fscrypt.h
index 4cdff7c15544..9cc5a61c1200 100644
--- a/include/linux/fscrypt.h
+++ b/include/linux/fscrypt.h
@@ -313,6 +313,7 @@ static inline struct page *fscrypt_pagecache_page(struct page *bounce_page)
void fscrypt_free_bounce_page(struct page *bounce_page);
/* policy.c */
+int fscrypt_have_same_policy(struct inode *inode1, struct inode *inode2);
int fscrypt_ioctl_set_policy(struct file *filp, const void __user *arg);
int fscrypt_ioctl_get_policy(struct file *filp, void __user *arg);
int fscrypt_ioctl_get_policy_ex(struct file *filp, void __user *arg);
@@ -490,6 +491,12 @@ static inline void fscrypt_free_bounce_page(struct page *bounce_page)
}
/* policy.c */
+static inline int fscrypt_have_same_policy(struct inode *inode1,
+ struct inode *inode2)
+{
+ return 1;
+}
+
static inline int fscrypt_ioctl_set_policy(struct file *filp,
const void __user *arg)
{
--
2.35.1
next prev parent reply other threads:[~2022-10-20 16:59 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-20 16:58 [PATCH v3 00/22] btrfs: add fscrypt integration Sweet Tea Dorminy
2022-10-20 16:58 ` [PATCH v3 01/22] fscrypt: expose fscrypt_nokey_name Sweet Tea Dorminy
2022-10-20 16:58 ` Sweet Tea Dorminy [this message]
2022-10-20 20:52 ` [PATCH v3 02/22] fscrypt: add fscrypt_have_same_policy() to check inode compatibility Josef Bacik
2022-10-20 16:58 ` [PATCH v3 03/22] fscrypt: allow fscrypt_generate_iv() to distinguish filenames Sweet Tea Dorminy
2022-10-20 16:58 ` [PATCH v3 04/22] fscrypt: add extent-based encryption Sweet Tea Dorminy
2022-10-20 21:40 ` Eric Biggers
2022-10-20 22:20 ` Sweet Tea Dorminy
2022-10-20 21:45 ` Eric Biggers
2022-10-20 22:55 ` Sweet Tea Dorminy
2022-10-20 23:56 ` Eric Biggers
2022-10-21 0:37 ` Sweet Tea Dorminy
2022-10-20 16:58 ` [PATCH v3 05/22] fscrypt: document btrfs' fscrypt quirks Sweet Tea Dorminy
2022-10-20 21:41 ` Eric Biggers
2022-10-20 22:07 ` Sweet Tea Dorminy
2022-10-20 16:58 ` [PATCH v3 06/22] btrfs: use struct qstr instead of name and namelen Sweet Tea Dorminy
2022-10-20 16:58 ` [PATCH v3 07/22] btrfs: setup qstrings from dentrys using fscrypt helper Sweet Tea Dorminy
2022-10-20 16:58 ` [PATCH v3 08/22] btrfs: use struct fscrypt_str instead of struct qstr Sweet Tea Dorminy
2022-10-21 20:42 ` Josef Bacik
2022-10-20 16:58 ` [PATCH v3 09/22] btrfs: store directory encryption state Sweet Tea Dorminy
2022-10-20 16:58 ` [PATCH v3 10/22] btrfs: disable various operations on encrypted inodes Sweet Tea Dorminy
2022-10-20 16:58 ` [PATCH v3 11/22] btrfs: start using fscrypt hooks Sweet Tea Dorminy
2022-10-20 16:58 ` [PATCH v3 12/22] btrfs: add fscrypt_context items Sweet Tea Dorminy
2022-10-21 20:54 ` Josef Bacik
2022-10-20 16:58 ` [PATCH v3 13/22] btrfs: translate btrfs encryption flags and encrypted inode flag Sweet Tea Dorminy
2022-10-20 16:58 ` [PATCH v3 14/22] btrfs: store a fscrypt extent context per normal file extent Sweet Tea Dorminy
2022-10-20 16:58 ` [PATCH v3 15/22] btrfs: encrypt normal file extent data if appropriate Sweet Tea Dorminy
2022-10-21 20:58 ` Josef Bacik
2022-10-20 16:58 ` [PATCH v3 16/22] btrfs: Add new FEATURE_INCOMPAT_ENCRYPT feature flag Sweet Tea Dorminy
2022-10-20 16:58 ` [PATCH v3 17/22] btrfs: implement fscrypt ioctls Sweet Tea Dorminy
2022-10-20 16:58 ` [PATCH v3 18/22] btrfs: permit searching for nokey names for removal Sweet Tea Dorminy
2022-10-20 16:58 ` [PATCH v3 19/22] btrfs: use correct name hash for nokey names Sweet Tea Dorminy
2022-10-20 16:58 ` [PATCH v3 20/22] btrfs: adapt lookup for partially encrypted directories Sweet Tea Dorminy
2022-10-20 16:58 ` [PATCH v3 21/22] fscrypt: add flag allowing partially-encrypted directories Sweet Tea Dorminy
2022-10-20 16:58 ` [PATCH v3 22/22] btrfs: encrypt verity items Sweet Tea Dorminy
2022-10-20 21:38 ` [PATCH v3 00/22] btrfs: add fscrypt integration Eric Biggers
2022-10-20 23:12 ` David Sterba
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