1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/fs/ext4/xattr_security.c 4 * Handler for storing security labels as extended attributes. 5 */ 6 7 #include <linux/string.h> 8 #include <linux/fs.h> 9 #include <linux/security.h> 10 #include <linux/slab.h> 11 #include "ext4_jbd2.h" 12 #include "ext4.h" 13 #include "xattr.h" 14 15 static int 16 ext4_xattr_security_get(const struct xattr_handler *handler, 17 struct dentry *unused, struct inode *inode, 18 const char *name, void *buffer, size_t size) 19 { 20 return ext4_xattr_get(inode, EXT4_XATTR_INDEX_SECURITY, 21 name, buffer, size); 22 } 23 24 static int 25 ext4_xattr_security_set(const struct xattr_handler *handler, 26 struct user_namespace *mnt_userns, 27 struct dentry *unused, struct inode *inode, 28 const char *name, const void *value, 29 size_t size, int flags) 30 { 31 return ext4_xattr_set(inode, EXT4_XATTR_INDEX_SECURITY, 32 name, value, size, flags); 33 } 34 35 static int 36 ext4_initxattrs(struct inode *inode, const struct xattr *xattr_array, 37 void *fs_info) 38 { 39 const struct xattr *xattr; 40 handle_t *handle = fs_info; 41 int err = 0; 42 43 for (xattr = xattr_array; xattr->name != NULL; xattr++) { 44 err = ext4_xattr_set_handle(handle, inode, 45 EXT4_XATTR_INDEX_SECURITY, 46 xattr->name, xattr->value, 47 xattr->value_len, XATTR_CREATE); 48 if (err < 0) 49 break; 50 } 51 return err; 52 } 53 54 int 55 ext4_init_security(handle_t *handle, struct inode *inode, struct inode *dir, 56 const struct qstr *qstr) 57 { 58 return security_inode_init_security(inode, dir, qstr, 59 &ext4_initxattrs, handle); 60 } 61 62 const struct xattr_handler ext4_xattr_security_handler = { 63 .prefix = XATTR_SECURITY_PREFIX, 64 .get = ext4_xattr_security_get, 65 .set = ext4_xattr_security_set, 66 }; 67