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Message-Id: <20171023214058.128121-2-ebiggers3@gmail.com>
Date: Mon, 23 Oct 2017 14:40:34 -0700
From: Eric Biggers <ebiggers3@...il.com>
To: linux-fscrypt@...r.kernel.org
Cc: linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
linux-f2fs-devel@...ts.sourceforge.net,
linux-mtd@...ts.infradead.org, linux-api@...r.kernel.org,
keyrings@...r.kernel.org, "Theodore Y . Ts'o" <tytso@....edu>,
Jaegeuk Kim <jaegeuk@...nel.org>,
Gwendal Grignou <gwendal@...omium.org>,
Ryo Hashimoto <hashimoto@...omium.org>,
Sarthak Kukreti <sarthakkukreti@...omium.org>,
Nick Desaulniers <ndesaulniers@...gle.com>,
Michael Halcrow <mhalcrow@...gle.com>,
Eric Biggers <ebiggers@...gle.com>
Subject: [RFC PATCH 01/25] fs, fscrypt: move uapi definitions to new header <linux/fscrypt.h>
From: Eric Biggers <ebiggers@...gle.com>
There are going to be more filesystem encryption definitions added, and
we don't want to use a disproportionate amount of space in <linux/fs.h>
for filesystem encryption stuff. So move the fscrypt definitions to a
new header <linux/fscrypt.h>.
For compatibility with existing userspace programs which may be
including <linux/fs.h>, <linux/fs.h> still includes the new header.
(It's debatable whether we really need this, though; the filesystem
encryption API is new enough that most if not all programs that are
using it have to declare it themselves anyway.)
Signed-off-by: Eric Biggers <ebiggers@...gle.com>
---
include/linux/fscrypt.h | 2 +-
include/uapi/linux/fs.h | 50 +++--------------------------------------
include/uapi/linux/fscrypt.h | 53 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 57 insertions(+), 48 deletions(-)
create mode 100644 include/uapi/linux/fscrypt.h
diff --git a/include/linux/fscrypt.h b/include/linux/fscrypt.h
index 53437bfdfcbc..f7aa7d62e235 100644
--- a/include/linux/fscrypt.h
+++ b/include/linux/fscrypt.h
@@ -19,7 +19,7 @@
#include <linux/bio.h>
#include <linux/dcache.h>
#include <crypto/skcipher.h>
-#include <uapi/linux/fs.h>
+#include <uapi/linux/fscrypt.h>
#define FS_CRYPTO_BLOCK_SIZE 16
diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h
index 56235dddea7d..6ecd3ee9960c 100644
--- a/include/uapi/linux/fs.h
+++ b/include/uapi/linux/fs.h
@@ -12,6 +12,9 @@
#include <linux/limits.h>
#include <linux/ioctl.h>
#include <linux/types.h>
+#ifndef __KERNEL__
+#include <linux/fscrypt.h>
+#endif
/*
* It's silly to have NR_OPEN bigger than NR_FILE, but you can change
@@ -253,53 +256,6 @@ struct fsxattr {
#define FS_IOC_FSGETXATTR _IOR ('X', 31, struct fsxattr)
#define FS_IOC_FSSETXATTR _IOW ('X', 32, struct fsxattr)
-/*
- * File system encryption support
- */
-/* Policy provided via an ioctl on the topmost directory */
-#define FS_KEY_DESCRIPTOR_SIZE 8
-
-#define FS_POLICY_FLAGS_PAD_4 0x00
-#define FS_POLICY_FLAGS_PAD_8 0x01
-#define FS_POLICY_FLAGS_PAD_16 0x02
-#define FS_POLICY_FLAGS_PAD_32 0x03
-#define FS_POLICY_FLAGS_PAD_MASK 0x03
-#define FS_POLICY_FLAGS_VALID 0x03
-
-/* Encryption algorithms */
-#define FS_ENCRYPTION_MODE_INVALID 0
-#define FS_ENCRYPTION_MODE_AES_256_XTS 1
-#define FS_ENCRYPTION_MODE_AES_256_GCM 2
-#define FS_ENCRYPTION_MODE_AES_256_CBC 3
-#define FS_ENCRYPTION_MODE_AES_256_CTS 4
-#define FS_ENCRYPTION_MODE_AES_128_CBC 5
-#define FS_ENCRYPTION_MODE_AES_128_CTS 6
-
-struct fscrypt_policy {
- __u8 version;
- __u8 contents_encryption_mode;
- __u8 filenames_encryption_mode;
- __u8 flags;
- __u8 master_key_descriptor[FS_KEY_DESCRIPTOR_SIZE];
-};
-
-#define FS_IOC_SET_ENCRYPTION_POLICY _IOR('f', 19, struct fscrypt_policy)
-#define FS_IOC_GET_ENCRYPTION_PWSALT _IOW('f', 20, __u8[16])
-#define FS_IOC_GET_ENCRYPTION_POLICY _IOW('f', 21, struct fscrypt_policy)
-
-/* Parameters for passing an encryption key into the kernel keyring */
-#define FS_KEY_DESC_PREFIX "fscrypt:"
-#define FS_KEY_DESC_PREFIX_SIZE 8
-
-/* Structure that userspace passes to the kernel keyring */
-#define FS_MAX_KEY_SIZE 64
-
-struct fscrypt_key {
- __u32 mode;
- __u8 raw[FS_MAX_KEY_SIZE];
- __u32 size;
-};
-
/*
* Inode flags (FS_IOC_GETFLAGS / FS_IOC_SETFLAGS)
*
diff --git a/include/uapi/linux/fscrypt.h b/include/uapi/linux/fscrypt.h
new file mode 100644
index 000000000000..c09209fc42ea
--- /dev/null
+++ b/include/uapi/linux/fscrypt.h
@@ -0,0 +1,53 @@
+#ifndef _UAPI_LINUX_FSCRYPT_H
+#define _UAPI_LINUX_FSCRYPT_H
+
+#include <linux/types.h>
+
+/*
+ * File system encryption support
+ */
+/* Policy provided via an ioctl on the topmost directory */
+#define FS_KEY_DESCRIPTOR_SIZE 8
+
+#define FS_POLICY_FLAGS_PAD_4 0x00
+#define FS_POLICY_FLAGS_PAD_8 0x01
+#define FS_POLICY_FLAGS_PAD_16 0x02
+#define FS_POLICY_FLAGS_PAD_32 0x03
+#define FS_POLICY_FLAGS_PAD_MASK 0x03
+#define FS_POLICY_FLAGS_VALID 0x03
+
+/* Encryption algorithms */
+#define FS_ENCRYPTION_MODE_INVALID 0
+#define FS_ENCRYPTION_MODE_AES_256_XTS 1
+#define FS_ENCRYPTION_MODE_AES_256_GCM 2
+#define FS_ENCRYPTION_MODE_AES_256_CBC 3
+#define FS_ENCRYPTION_MODE_AES_256_CTS 4
+#define FS_ENCRYPTION_MODE_AES_128_CBC 5
+#define FS_ENCRYPTION_MODE_AES_128_CTS 6
+
+struct fscrypt_policy {
+ __u8 version;
+ __u8 contents_encryption_mode;
+ __u8 filenames_encryption_mode;
+ __u8 flags;
+ __u8 master_key_descriptor[FS_KEY_DESCRIPTOR_SIZE];
+};
+
+#define FS_IOC_SET_ENCRYPTION_POLICY _IOR('f', 19, struct fscrypt_policy)
+#define FS_IOC_GET_ENCRYPTION_PWSALT _IOW('f', 20, __u8[16])
+#define FS_IOC_GET_ENCRYPTION_POLICY _IOW('f', 21, struct fscrypt_policy)
+
+/* Parameters for passing an encryption key into the kernel keyring */
+#define FS_KEY_DESC_PREFIX "fscrypt:"
+#define FS_KEY_DESC_PREFIX_SIZE 8
+
+/* Structure that userspace passes to the kernel keyring */
+#define FS_MAX_KEY_SIZE 64
+
+struct fscrypt_key {
+ __u32 mode;
+ __u8 raw[FS_MAX_KEY_SIZE];
+ __u32 size;
+};
+
+#endif /* _UAPI_LINUX_FSCRYPT_H */
--
2.15.0.rc0.271.g36b669edcc-goog
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