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Linux/fs/ext4/xattr_security.c

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  1 /*
  2  * linux/fs/ext4/xattr_security.c
  3  * Handler for storing security labels as extended attributes.
  4  */
  5 
  6 #include <linux/string.h>
  7 #include <linux/fs.h>
  8 #include <linux/security.h>
  9 #include <linux/slab.h>
 10 #include "ext4_jbd2.h"
 11 #include "ext4.h"
 12 #include "xattr.h"
 13 
 14 static size_t
 15 ext4_xattr_security_list(struct dentry *dentry, char *list, size_t list_size,
 16                 const char *name, size_t name_len, int type)
 17 {
 18         const size_t prefix_len = sizeof(XATTR_SECURITY_PREFIX)-1;
 19         const size_t total_len = prefix_len + name_len + 1;
 20 
 21 
 22         if (list && total_len <= list_size) {
 23                 memcpy(list, XATTR_SECURITY_PREFIX, prefix_len);
 24                 memcpy(list+prefix_len, name, name_len);
 25                 list[prefix_len + name_len] = '\0';
 26         }
 27         return total_len;
 28 }
 29 
 30 static int
 31 ext4_xattr_security_get(struct dentry *dentry, const char *name,
 32                        void *buffer, size_t size, int type)
 33 {
 34         if (strcmp(name, "") == 0)
 35                 return -EINVAL;
 36         return ext4_xattr_get(dentry->d_inode, EXT4_XATTR_INDEX_SECURITY,
 37                               name, buffer, size);
 38 }
 39 
 40 static int
 41 ext4_xattr_security_set(struct dentry *dentry, const char *name,
 42                 const void *value, size_t size, int flags, int type)
 43 {
 44         if (strcmp(name, "") == 0)
 45                 return -EINVAL;
 46         return ext4_xattr_set(dentry->d_inode, EXT4_XATTR_INDEX_SECURITY,
 47                               name, value, size, flags);
 48 }
 49 
 50 static int
 51 ext4_initxattrs(struct inode *inode, const struct xattr *xattr_array,
 52                 void *fs_info)
 53 {
 54         const struct xattr *xattr;
 55         handle_t *handle = fs_info;
 56         int err = 0;
 57 
 58         for (xattr = xattr_array; xattr->name != NULL; xattr++) {
 59                 err = ext4_xattr_set_handle(handle, inode,
 60                                             EXT4_XATTR_INDEX_SECURITY,
 61                                             xattr->name, xattr->value,
 62                                             xattr->value_len, 0);
 63                 if (err < 0)
 64                         break;
 65         }
 66         return err;
 67 }
 68 
 69 int
 70 ext4_init_security(handle_t *handle, struct inode *inode, struct inode *dir,
 71                    const struct qstr *qstr)
 72 {
 73         return security_inode_init_security(inode, dir, qstr,
 74                                             &ext4_initxattrs, handle);
 75 }
 76 
 77 const struct xattr_handler ext4_xattr_security_handler = {
 78         .prefix = XATTR_SECURITY_PREFIX,
 79         .list   = ext4_xattr_security_list,
 80         .get    = ext4_xattr_security_get,
 81         .set    = ext4_xattr_security_set,
 82 };
 83 

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