1 #include "reiserfs.h" 2 #include <linux/errno.h> 3 #include <linux/fs.h> 4 #include <linux/pagemap.h> 5 #include <linux/xattr.h> 6 #include <linux/slab.h> 7 #include "xattr.h" 8 #include <linux/security.h> 9 #include <linux/uaccess.h> 10 11 static int 12 security_get(const struct xattr_handler *handler, struct dentry *unused, 13 struct inode *inode, const char *name, void *buffer, size_t size) 14 { 15 if (IS_PRIVATE(inode)) 16 return -EPERM; 17 18 return reiserfs_xattr_get(inode, xattr_full_name(handler, name), 19 buffer, size); 20 } 21 22 static int 23 security_set(const struct xattr_handler *handler, struct dentry *unused, 24 struct inode *inode, const char *name, const void *buffer, 25 size_t size, int flags) 26 { 27 if (IS_PRIVATE(inode)) 28 return -EPERM; 29 30 return reiserfs_xattr_set(inode, 31 xattr_full_name(handler, name), 32 buffer, size, flags); 33 } 34 35 static bool security_list(struct dentry *dentry) 36 { 37 return !IS_PRIVATE(d_inode(dentry)); 38 } 39 40 /* Initializes the security context for a new inode and returns the number 41 * of blocks needed for the transaction. If successful, reiserfs_security 42 * must be released using reiserfs_security_free when the caller is done. */ 43 int reiserfs_security_init(struct inode *dir, struct inode *inode, 44 const struct qstr *qstr, 45 struct reiserfs_security_handle *sec) 46 { 47 int blocks = 0; 48 int error; 49 50 sec->name = NULL; 51 52 /* Don't add selinux attributes on xattrs - they'll never get used */ 53 if (IS_PRIVATE(dir)) 54 return 0; 55 56 error = security_old_inode_init_security(inode, dir, qstr, &sec->name, 57 &sec->value, &sec->length); 58 if (error) { 59 if (error == -EOPNOTSUPP) 60 error = 0; 61 62 sec->name = NULL; 63 sec->value = NULL; 64 sec->length = 0; 65 return error; 66 } 67 68 if (sec->length && reiserfs_xattrs_initialized(inode->i_sb)) { 69 blocks = reiserfs_xattr_jcreate_nblocks(inode) + 70 reiserfs_xattr_nblocks(inode, sec->length); 71 /* We don't want to count the directories twice if we have 72 * a default ACL. */ 73 REISERFS_I(inode)->i_flags |= i_has_xattr_dir; 74 } 75 return blocks; 76 } 77 78 int reiserfs_security_write(struct reiserfs_transaction_handle *th, 79 struct inode *inode, 80 struct reiserfs_security_handle *sec) 81 { 82 int error; 83 if (strlen(sec->name) < sizeof(XATTR_SECURITY_PREFIX)) 84 return -EINVAL; 85 86 error = reiserfs_xattr_set_handle(th, inode, sec->name, sec->value, 87 sec->length, XATTR_CREATE); 88 if (error == -ENODATA || error == -EOPNOTSUPP) 89 error = 0; 90 91 return error; 92 } 93 94 void reiserfs_security_free(struct reiserfs_security_handle *sec) 95 { 96 kfree(sec->name); 97 kfree(sec->value); 98 sec->name = NULL; 99 sec->value = NULL; 100 } 101 102 const struct xattr_handler reiserfs_xattr_security_handler = { 103 .prefix = XATTR_SECURITY_PREFIX, 104 .get = security_get, 105 .set = security_set, 106 .list = security_list, 107 }; 108