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hfsplus: remove can_set_xattr 

When using the per-superblock xattr handlers permission checking is
done by the generic code.  hfsplus just needs to check for the magic
osx attribute not to leak into protected namespaces.

Also given that the code was obviously copied from JFS the proper
attribution was missing.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Christoph Hellwig 2013-12-20 05:16:56 -08:00 committed by Al Viro
parent 4ac7249ea5
commit 2796e4cec5
1 changed files with 3 additions and 84 deletions
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87
fs/hfsplus/xattr.c
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@ -52,82 +52,6 @@ static inline int is_known_namespace(const char *name)
return true;
}
static int can_set_system_xattr(struct inode *inode, const char *name,
const void *value, size_t size)
{
#ifdef CONFIG_HFSPLUS_FS_POSIX_ACL
struct posix_acl *acl;
int err;
if (!inode_owner_or_capable(inode))
return -EPERM;
/*
* POSIX_ACL_XATTR_ACCESS is tied to i_mode
*/
if (strcmp(name, POSIX_ACL_XATTR_ACCESS) == 0) {
acl = posix_acl_from_xattr(&init_user_ns, value, size);
if (IS_ERR(acl))
return PTR_ERR(acl);
if (acl) {
err = posix_acl_equiv_mode(acl, &inode->i_mode);
posix_acl_release(acl);
if (err < 0)
return err;
mark_inode_dirty(inode);
}
/*
* We're changing the ACL. Get rid of the cached one
*/
forget_cached_acl(inode, ACL_TYPE_ACCESS);
return 0;
} else if (strcmp(name, POSIX_ACL_XATTR_DEFAULT) == 0) {
acl = posix_acl_from_xattr(&init_user_ns, value, size);
if (IS_ERR(acl))
return PTR_ERR(acl);
posix_acl_release(acl);
/*
* We're changing the default ACL. Get rid of the cached one
*/
forget_cached_acl(inode, ACL_TYPE_DEFAULT);
return 0;
}
#endif /* CONFIG_HFSPLUS_FS_POSIX_ACL */
return -EOPNOTSUPP;
}
static int can_set_xattr(struct inode *inode, const char *name,
const void *value, size_t value_len)
{
if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
return can_set_system_xattr(inode, name, value, value_len);
if (!strncmp(name, XATTR_MAC_OSX_PREFIX, XATTR_MAC_OSX_PREFIX_LEN)) {
/*
* This makes sure that we aren't trying to set an
* attribute in a different namespace by prefixing it
* with "osx."
*/
if (is_known_namespace(name + XATTR_MAC_OSX_PREFIX_LEN))
return -EOPNOTSUPP;
return 0;
}
/*
* Don't allow setting an attribute in an unknown namespace.
*/
if (strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) &&
strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) &&
strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN))
return -EOPNOTSUPP;
return 0;
}
static void hfsplus_init_header_node(struct inode *attr_file,
u32 clump_size,
char *buf, u16 node_size)
@ -350,10 +274,6 @@ int __hfsplus_setxattr(struct inode *inode, const char *name,
HFSPLUS_IS_RSRC(inode))
return -EOPNOTSUPP;
err = can_set_xattr(inode, name, value, size);
if (err)
return err;
if (strncmp(name, XATTR_MAC_OSX_PREFIX,
XATTR_MAC_OSX_PREFIX_LEN) == 0)
name += XATTR_MAC_OSX_PREFIX_LEN;
@ -841,10 +761,6 @@ int hfsplus_removexattr(struct dentry *dentry, const char *name)
if (!HFSPLUS_SB(inode->i_sb)->attr_tree)
return -EOPNOTSUPP;
err = can_set_xattr(inode, name, NULL, 0);
if (err)
return err;
if (strncmp(name, XATTR_MAC_OSX_PREFIX,
XATTR_MAC_OSX_PREFIX_LEN) == 0)
name += XATTR_MAC_OSX_PREFIX_LEN;
@ -941,6 +857,9 @@ static int hfsplus_osx_setxattr(struct dentry *dentry, const char *name,
if (len > HFSPLUS_ATTR_MAX_STRLEN)
return -EOPNOTSUPP;
if (is_known_namespace(name))
return -EOPNOTSUPP;
strcpy(xattr_name, XATTR_MAC_OSX_PREFIX);
strcpy(xattr_name + XATTR_MAC_OSX_PREFIX_LEN, name);