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