1 /* 2 * linux/fs/ext4/xattr_security.c 3 * Handler for storing security labels as extended attributes. 4 */ 5 6 #include <linux/string.h> 7 #include <linux/fs.h> 8 #include <linux/security.h> 9 #include <linux/slab.h> 10 #include "ext4_jbd2.h" 11 #include "ext4.h" 12 #include "xattr.h" 13 14 static int 15 ext4_xattr_security_get(const struct xattr_handler *handler, 16 struct dentry *unused, struct inode *inode, 17 const char *name, void *buffer, size_t size) 18 { 19 return ext4_xattr_get(inode, EXT4_XATTR_INDEX_SECURITY, 20 name, buffer, size); 21 } 22 23 static int 24 ext4_xattr_security_set(const struct xattr_handler *handler, 25 struct dentry *unused, struct inode *inode, 26 const char *name, const void *value, 27 size_t size, int flags) 28 { 29 return ext4_xattr_set(inode, EXT4_XATTR_INDEX_SECURITY, 30 name, value, size, flags); 31 } 32 33 static int 34 ext4_initxattrs(struct inode *inode, const struct xattr *xattr_array, 35 void *fs_info) 36 { 37 const struct xattr *xattr; 38 handle_t *handle = fs_info; 39 int err = 0; 40 41 for (xattr = xattr_array; xattr->name != NULL; xattr++) { 42 err = ext4_xattr_set_handle(handle, inode, 43 EXT4_XATTR_INDEX_SECURITY, 44 xattr->name, xattr->value, 45 xattr->value_len, 0); 46 if (err < 0) 47 break; 48 } 49 return err; 50 } 51 52 int 53 ext4_init_security(handle_t *handle, struct inode *inode, struct inode *dir, 54 const struct qstr *qstr) 55 { 56 return security_inode_init_security(inode, dir, qstr, 57 &ext4_initxattrs, handle); 58 } 59 60 const struct xattr_handler ext4_xattr_security_handler = { 61 .prefix = XATTR_SECURITY_PREFIX, 62 .get = ext4_xattr_security_get, 63 .set = ext4_xattr_security_set, 64 }; 65