/* * linux/fs/ext4/xattr_security.c * Handler for storing security labels as extended attributes. */ #include <linux/string.h> #include <linux/fs.h> #include <linux/security.h> #include <linux/slab.h> #include "ext4_jbd2.h" #include "ext4.h" #include "xattr.h" static size_t ext4_xattr_security_list(struct dentry *dentry, char *list, size_t list_size, const char *name, size_t name_len, int type) { const size_t prefix_len = sizeof(XATTR_SECURITY_PREFIX)-1; const size_t total_len = prefix_len + name_len + 1; if (list && total_len <= list_size) { memcpy(list, XATTR_SECURITY_PREFIX, prefix_len); memcpy(list+prefix_len, name, name_len); list[prefix_len + name_len] = '\0'; } return total_len; } static int ext4_xattr_security_get(struct dentry *dentry, const char *name, void *buffer, size_t size, int type) { if (strcmp(name, "") == 0) return -EINVAL; return ext4_xattr_get(dentry->d_inode, EXT4_XATTR_INDEX_SECURITY, name, buffer, size); } static int ext4_xattr_security_set(struct dentry *dentry, const char *name, const void *value, size_t size, int flags, int type) { if (strcmp(name, "") == 0) return -EINVAL; return ext4_xattr_set(dentry->d_inode, EXT4_XATTR_INDEX_SECURITY, name, value, size, flags); } static int ext4_initxattrs(struct inode *inode, const struct xattr *xattr_array, void *fs_info) { const struct xattr *xattr; handle_t *handle = fs_info; int err = 0; for (xattr = xattr_array; xattr->name != NULL; xattr++) { err = ext4_xattr_set_handle(handle, inode, EXT4_XATTR_INDEX_SECURITY, xattr->name, xattr->value, xattr->value_len, 0); if (err < 0) break; } return err; } int ext4_init_security(handle_t *handle, struct inode *inode, struct inode *dir, const struct qstr *qstr) { return security_inode_init_security(inode, dir, qstr, &ext4_initxattrs, handle); } const struct xattr_handler ext4_xattr_security_handler = { .prefix = XATTR_SECURITY_PREFIX, .list = ext4_xattr_security_list, .get = ext4_xattr_security_get, .set = ext4_xattr_security_set, };