/* * linux/fs/ext4/xattr_security.c * Handler for storing security labels as extended attributes. */ #include <linux/module.h> #include <linux/string.h> #include <linux/fs.h> #include <linux/security.h> #include "ext4_jbd2.h" #include "ext4.h" #include "xattr.h" static size_t ext4_xattr_security_list(struct inode *inode, char *list, size_t list_size, const char *name, size_t name_len) { 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 inode *inode, const char *name, void *buffer, size_t size) { if (strcmp(name, "") == 0) return -EINVAL; return ext4_xattr_get(inode, EXT4_XATTR_INDEX_SECURITY, name, buffer, size); } static int ext4_xattr_security_set(struct inode *inode, const char *name, const void *value, size_t size, int flags) { if (strcmp(name, "") == 0) return -EINVAL; return ext4_xattr_set(inode, EXT4_XATTR_INDEX_SECURITY, name, value, size, flags); } int ext4_init_security(handle_t *handle, struct inode *inode, struct inode *dir) { int err; size_t len; void *value; char *name; err = security_inode_init_security(inode, dir, &name, &value, &len); if (err) { if (err == -EOPNOTSUPP) return 0; return err; } err = ext4_xattr_set_handle(handle, inode, EXT4_XATTR_INDEX_SECURITY, name, value, len, 0); kfree(name); kfree(value); return err; } 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, };