From 8326c1eec2449f0e868f7b19a5fa7bfa0386ab48 Mon Sep 17 00:00:00 2001 From: Hyunchul Lee Date: Fri, 3 Mar 2017 16:44:03 +0900 Subject: [PATCH] ubifs: Add CONFIG_UBIFS_FS_SECURITY to disable/enable security labels When write syscall is called, every time security label is searched to determine that file's privileges should be changed. If LSM(Linux Security Model) is not used, this is useless. So introduce CONFIG_UBIFS_SECURITY to disable security labels. it's default value is "y". Signed-off-by: Hyunchul Lee Signed-off-by: Richard Weinberger --- fs/ubifs/Kconfig | 13 +++++++++++++ fs/ubifs/ubifs.h | 14 ++++++++++++-- fs/ubifs/xattr.c | 6 ++++++ 3 files changed, 31 insertions(+), 2 deletions(-) diff --git a/fs/ubifs/Kconfig b/fs/ubifs/Kconfig index b0d0623c83ed..83a961bf7280 100644 --- a/fs/ubifs/Kconfig +++ b/fs/ubifs/Kconfig @@ -61,3 +61,16 @@ config UBIFS_FS_ENCRYPTION feature is similar to ecryptfs, but it is more memory efficient since it avoids caching the encrypted and decrypted pages in the page cache. + +config UBIFS_FS_SECURITY + bool "UBIFS Security Labels" + depends on UBIFS_FS + default y + help + Security labels provide an access control facility to support Linux + Security Models (LSMs) accepted by AppArmor, SELinux, Smack and TOMOYO + Linux. This option enables an extended attribute handler for file + security labels in the ubifs filesystem, so that it requires enabling + the extended attribute support in advance. + + If you are not using a security module, say N. diff --git a/fs/ubifs/ubifs.h b/fs/ubifs/ubifs.h index 4d57e488038e..abdd11634ba4 100644 --- a/fs/ubifs/ubifs.h +++ b/fs/ubifs/ubifs.h @@ -1756,13 +1756,23 @@ int ubifs_check_dir_empty(struct inode *dir); /* xattr.c */ extern const struct xattr_handler *ubifs_xattr_handlers[]; ssize_t ubifs_listxattr(struct dentry *dentry, char *buffer, size_t size); -int ubifs_init_security(struct inode *dentry, struct inode *inode, - const struct qstr *qstr); int ubifs_xattr_set(struct inode *host, const char *name, const void *value, size_t size, int flags); ssize_t ubifs_xattr_get(struct inode *host, const char *name, void *buf, size_t size); +#ifdef CONFIG_UBIFS_FS_SECURITY +extern int ubifs_init_security(struct inode *dentry, struct inode *inode, + const struct qstr *qstr); +#else +static inline int ubifs_init_security(struct inode *dentry, + struct inode *inode, const struct qstr *qstr) +{ + return 0; +} +#endif + + /* super.c */ struct inode *ubifs_iget(struct super_block *sb, unsigned long inum); diff --git a/fs/ubifs/xattr.c b/fs/ubifs/xattr.c index efe00fcb8b75..de88732c680c 100644 --- a/fs/ubifs/xattr.c +++ b/fs/ubifs/xattr.c @@ -559,6 +559,7 @@ out_free: return err; } +#ifdef CONFIG_UBIFS_FS_SECURITY static int init_xattrs(struct inode *inode, const struct xattr *xattr_array, void *fs_info) { @@ -599,6 +600,7 @@ int ubifs_init_security(struct inode *dentry, struct inode *inode, } return err; } +#endif static int xattr_get(const struct xattr_handler *handler, struct dentry *dentry, struct inode *inode, @@ -639,15 +641,19 @@ static const struct xattr_handler ubifs_trusted_xattr_handler = { .set = xattr_set, }; +#ifdef CONFIG_UBIFS_FS_SECURITY static const struct xattr_handler ubifs_security_xattr_handler = { .prefix = XATTR_SECURITY_PREFIX, .get = xattr_get, .set = xattr_set, }; +#endif const struct xattr_handler *ubifs_xattr_handlers[] = { &ubifs_user_xattr_handler, &ubifs_trusted_xattr_handler, +#ifdef CONFIG_UBIFS_FS_SECURITY &ubifs_security_xattr_handler, +#endif NULL }; -- 2.20.1