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 dentry *unused, struct inode *inode, 27 const char *name, const void *value, 28 size_t size, int flags) 29 { 30 return ext4_xattr_set(inode, EXT4_XATTR_INDEX_SECURITY, 31 name, value, size, flags); 32 } 33 34 static int 35 ext4_initxattrs(struct inode *inode, const struct xattr *xattr_array, 36 void *fs_info) 37 { 38 const struct xattr *xattr; 39 handle_t *handle = fs_info; 40 int err = 0; 41 42 for (xattr = xattr_array; xattr->name != NULL; xattr++) { 43 err = ext4_xattr_set_handle(handle, inode, 44 EXT4_XATTR_INDEX_SECURITY, 45 xattr->name, xattr->value, 46 xattr->value_len, XATTR_CREATE); 47 if (err < 0) 48 break; 49 } 50 return err; 51 } 52 53 int 54 ext4_init_security(handle_t *handle, struct inode *inode, struct inode *dir, 55 const struct qstr *qstr) 56 { 57 return security_inode_init_security(inode, dir, qstr, 58 &ext4_initxattrs, handle); 59 } 60 61 const struct xattr_handler ext4_xattr_security_handler = { 62 .prefix = XATTR_SECURITY_PREFIX, 63 .get = ext4_xattr_security_get, 64 .set = ext4_xattr_security_set, 65 }; 66