/* * linux/fs/hfsplus/xattr_trusted.c * * Vyacheslav Dubeyko <slava@dubeyko.com> * * Handler for storing security labels as extended attributes. */ #include <linux/security.h> #include <linux/nls.h> #include "hfsplus_fs.h" #include "xattr.h" #include "acl.h" static int hfsplus_security_getxattr(struct dentry *dentry, const char *name, void *buffer, size_t size, int type) { char *xattr_name; int res; if (!strcmp(name, "")) return -EINVAL; xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1, GFP_KERNEL); if (!xattr_name) return -ENOMEM; strcpy(xattr_name, XATTR_SECURITY_PREFIX); strcpy(xattr_name + XATTR_SECURITY_PREFIX_LEN, name); res = hfsplus_getxattr(dentry, xattr_name, buffer, size); kfree(xattr_name); return res; } static int hfsplus_security_setxattr(struct dentry *dentry, const char *name, const void *buffer, size_t size, int flags, int type) { char *xattr_name; int res; if (!strcmp(name, "")) return -EINVAL; xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1, GFP_KERNEL); if (!xattr_name) return -ENOMEM; strcpy(xattr_name, XATTR_SECURITY_PREFIX); strcpy(xattr_name + XATTR_SECURITY_PREFIX_LEN, name); res = hfsplus_setxattr(dentry, xattr_name, buffer, size, flags); kfree(xattr_name); return res; } static size_t hfsplus_security_listxattr(struct dentry *dentry, char *list, size_t list_size, const char *name, size_t name_len, int type) { /* * This method is not used. * It is used hfsplus_listxattr() instead of generic_listxattr(). */ return -EOPNOTSUPP; } static int hfsplus_initxattrs(struct inode *inode, const struct xattr *xattr_array, void *fs_info) { const struct xattr *xattr; char *xattr_name; int err = 0; xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1, GFP_KERNEL); if (!xattr_name) return -ENOMEM; for (xattr = xattr_array; xattr->name != NULL; xattr++) { if (!strcmp(xattr->name, "")) continue; strcpy(xattr_name, XATTR_SECURITY_PREFIX); strcpy(xattr_name + XATTR_SECURITY_PREFIX_LEN, xattr->name); memset(xattr_name + XATTR_SECURITY_PREFIX_LEN + strlen(xattr->name), 0, 1); err = __hfsplus_setxattr(inode, xattr_name, xattr->value, xattr->value_len, 0); if (err) break; } kfree(xattr_name); return err; } int hfsplus_init_security(struct inode *inode, struct inode *dir, const struct qstr *qstr) { return security_inode_init_security(inode, dir, qstr, &hfsplus_initxattrs, NULL); } int hfsplus_init_inode_security(struct inode *inode, struct inode *dir, const struct qstr *qstr) { int err; err = hfsplus_init_posix_acl(inode, dir); if (!err) err = hfsplus_init_security(inode, dir, qstr); return err; } const struct xattr_handler hfsplus_xattr_security_handler = { .prefix = XATTR_SECURITY_PREFIX, .list = hfsplus_security_listxattr, .get = hfsplus_security_getxattr, .set = hfsplus_security_setxattr, };