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linux-sg2042
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[PATCH] Remove security_inode_post_create/mkdir/symlink/mknod hooks 

This patch removes the inode_post_create/mkdir/mknod/symlink LSM hooks as
they are obsoleted by the new inode_init_security hook that enables atomic
inode security labeling.

If anyone sees any reason to retain these hooks, please speak now.  Also,
is anyone using the post_rename/link hooks; if not, those could also be
removed.

Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Stephen Smalley 2005-09-09 13:01:44 -07:00 committed by Linus Torvalds
parent 570bc1c2e5
commit a74574aafe
5 changed files with 4 additions and 242 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
fs/namei.c
View File

@ -1316,10 +1316,8 @@ int vfs_create(struct inode *dir, struct dentry *dentry, int mode,
return error;
DQUOT_INIT(dir);
error = dir->i_op->create(dir, dentry, mode, nd);
if (!error) {
if (!error)
fsnotify_create(dir, dentry->d_name.name);
security_inode_post_create(dir, dentry, mode);
}
return error;
}
@ -1635,10 +1633,8 @@ int vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
DQUOT_INIT(dir);
error = dir->i_op->mknod(dir, dentry, mode, dev);
if (!error) {
if (!error)
fsnotify_create(dir, dentry->d_name.name);
security_inode_post_mknod(dir, dentry, mode, dev);
}
return error;
}
@ -1708,10 +1704,8 @@ int vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
DQUOT_INIT(dir);
error = dir->i_op->mkdir(dir, dentry, mode);
if (!error) {
if (!error)
fsnotify_mkdir(dir, dentry->d_name.name);
security_inode_post_mkdir(dir,dentry, mode);
}
return error;
}
@ -1947,10 +1941,8 @@ int vfs_symlink(struct inode *dir, struct dentry *dentry, const char *oldname, i
DQUOT_INIT(dir);
error = dir->i_op->symlink(dir, dentry, oldname);
if (!error) {
if (!error)
fsnotify_create(dir, dentry->d_name.name);
security_inode_post_symlink(dir, dentry, oldname);
}
return error;
}

90
include/linux/security.h
View File

@ -275,12 +275,6 @@ struct swap_info_struct;
* @dentry contains the dentry structure for the file to be created.
* @mode contains the file mode of the file to be created.
* Return 0 if permission is granted.
* @inode_post_create:
* Set the security attributes on a newly created regular file. This hook
* is called after a file has been successfully created.
* @dir contains the inode structure of the parent directory of the new file.
* @dentry contains the the dentry structure for the newly created file.
* @mode contains the file mode.
* @inode_link:
* Check permission before creating a new hard link to a file.
* @old_dentry contains the dentry structure for an existing link to the file.
@ -303,13 +297,6 @@ struct swap_info_struct;
* @dentry contains the dentry structure of the symbolic link.
* @old_name contains the pathname of file.
* Return 0 if permission is granted.
* @inode_post_symlink:
* @dir contains the inode structure of the parent directory of the new link.
* @dentry contains the dentry structure of new symbolic link.
* @old_name contains the pathname of file.
* Set security attributes for a newly created symbolic link. Note that
* @dentry->d_inode may be NULL, since the filesystem might not
* instantiate the dentry (e.g. NFS).
* @inode_mkdir:
* Check permissions to create a new directory in the existing directory
* associated with inode strcture @dir.
@ -317,11 +304,6 @@ struct swap_info_struct;
* @dentry contains the dentry structure of new directory.
* @mode contains the mode of new directory.
* Return 0 if permission is granted.
* @inode_post_mkdir:
* Set security attributes on a newly created directory.
* @dir contains the inode structure of parent of the directory to be created.
* @dentry contains the dentry structure of new directory.
* @mode contains the mode of new directory.
* @inode_rmdir:
* Check the permission to remove a directory.
* @dir contains the inode structure of parent of the directory to be removed.
@ -337,13 +319,6 @@ struct swap_info_struct;
* @mode contains the mode of the new file.
* @dev contains the the device number.
* Return 0 if permission is granted.
* @inode_post_mknod:
* Set security attributes on a newly created special file (or socket or
* fifo file created via the mknod system call).
* @dir contains the inode structure of parent of the new node.
* @dentry contains the dentry structure of the new node.
* @mode contains the mode of the new node.
* @dev contains the the device number.
* @inode_rename:
* Check for permission to rename a file or directory.
* @old_dir contains the inode structure for parent of the old link.
@ -1103,8 +1078,6 @@ struct security_operations {
char **name, void **value, size_t *len);
int (*inode_create) (struct inode *dir,
struct dentry *dentry, int mode);
void (*inode_post_create) (struct inode *dir,
struct dentry *dentry, int mode);
int (*inode_link) (struct dentry *old_dentry,
struct inode *dir, struct dentry *new_dentry);
void (*inode_post_link) (struct dentry *old_dentry,
@ -1112,17 +1085,10 @@ struct security_operations {
int (*inode_unlink) (struct inode *dir, struct dentry *dentry);
int (*inode_symlink) (struct inode *dir,
struct dentry *dentry, const char *old_name);
void (*inode_post_symlink) (struct inode *dir,
struct dentry *dentry,
const char *old_name);
int (*inode_mkdir) (struct inode *dir, struct dentry *dentry, int mode);
void (*inode_post_mkdir) (struct inode *dir, struct dentry *dentry,
int mode);
int (*inode_rmdir) (struct inode *dir, struct dentry *dentry);
int (*inode_mknod) (struct inode *dir, struct dentry *dentry,
int mode, dev_t dev);
void (*inode_post_mknod) (struct inode *dir, struct dentry *dentry,
int mode, dev_t dev);
int (*inode_rename) (struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry);
void (*inode_post_rename) (struct inode *old_dir,
@ -1484,15 +1450,6 @@ static inline int security_inode_create (struct inode *dir,
return security_ops->inode_create (dir, dentry, mode);
}
static inline void security_inode_post_create (struct inode *dir,
struct dentry *dentry,
int mode)
{
if (dentry->d_inode && unlikely (IS_PRIVATE (dentry->d_inode)))
return;
security_ops->inode_post_create (dir, dentry, mode);
}
static inline int security_inode_link (struct dentry *old_dentry,
struct inode *dir,
struct dentry *new_dentry)
@ -1528,15 +1485,6 @@ static inline int security_inode_symlink (struct inode *dir,
return security_ops->inode_symlink (dir, dentry, old_name);
}
static inline void security_inode_post_symlink (struct inode *dir,
struct dentry *dentry,
const char *old_name)
{
if (dentry->d_inode && unlikely (IS_PRIVATE (dentry->d_inode)))
return;
security_ops->inode_post_symlink (dir, dentry, old_name);
}
static inline int security_inode_mkdir (struct inode *dir,
struct dentry *dentry,
int mode)
@ -1546,15 +1494,6 @@ static inline int security_inode_mkdir (struct inode *dir,
return security_ops->inode_mkdir (dir, dentry, mode);
}
static inline void security_inode_post_mkdir (struct inode *dir,
struct dentry *dentry,
int mode)
{
if (dentry->d_inode && unlikely (IS_PRIVATE (dentry->d_inode)))
return;
security_ops->inode_post_mkdir (dir, dentry, mode);
}
static inline int security_inode_rmdir (struct inode *dir,
struct dentry *dentry)
{
@ -1572,15 +1511,6 @@ static inline int security_inode_mknod (struct inode *dir,
return security_ops->inode_mknod (dir, dentry, mode, dev);
}
static inline void security_inode_post_mknod (struct inode *dir,
struct dentry *dentry,
int mode, dev_t dev)
{
if (dentry->d_inode && unlikely (IS_PRIVATE (dentry->d_inode)))
return;
security_ops->inode_post_mknod (dir, dentry, mode, dev);
}
static inline int security_inode_rename (struct inode *old_dir,
struct dentry *old_dentry,
struct inode *new_dir,
@ -2220,11 +2150,6 @@ static inline int security_inode_create (struct inode *dir,
return 0;
}
static inline void security_inode_post_create (struct inode *dir,
struct dentry *dentry,
int mode)
{ }
static inline int security_inode_link (struct dentry *old_dentry,
struct inode *dir,
struct dentry *new_dentry)
@ -2250,11 +2175,6 @@ static inline int security_inode_symlink (struct inode *dir,
return 0;
}
static inline void security_inode_post_symlink (struct inode *dir,
struct dentry *dentry,
const char *old_name)
{ }
static inline int security_inode_mkdir (struct inode *dir,
struct dentry *dentry,
int mode)
@ -2262,11 +2182,6 @@ static inline int security_inode_mkdir (struct inode *dir,
return 0;
}
static inline void security_inode_post_mkdir (struct inode *dir,
struct dentry *dentry,
int mode)
{ }
static inline int security_inode_rmdir (struct inode *dir,
struct dentry *dentry)
{
@ -2280,11 +2195,6 @@ static inline int security_inode_mknod (struct inode *dir,
return 0;
}
static inline void security_inode_post_mknod (struct inode *dir,
struct dentry *dentry,
int mode, dev_t dev)
{ }
static inline int security_inode_rename (struct inode *old_dir,
struct dentry *old_dentry,
struct inode *new_dir,

28
security/dummy.c
View File

@ -270,12 +270,6 @@ static int dummy_inode_create (struct inode *inode, struct dentry *dentry,
return 0;
}
static void dummy_inode_post_create (struct inode *inode, struct dentry *dentry,
int mask)
{
return;
}
static int dummy_inode_link (struct dentry *old_dentry, struct inode *inode,
struct dentry *new_dentry)
{
@ -300,24 +294,12 @@ static int dummy_inode_symlink (struct inode *inode, struct dentry *dentry,
return 0;
}
static void dummy_inode_post_symlink (struct inode *inode,
struct dentry *dentry, const char *name)
{
return;
}
static int dummy_inode_mkdir (struct inode *inode, struct dentry *dentry,
int mask)
{
return 0;
}
static void dummy_inode_post_mkdir (struct inode *inode, struct dentry *dentry,
int mask)
{
return;
}
static int dummy_inode_rmdir (struct inode *inode, struct dentry *dentry)
{
return 0;
@ -329,12 +311,6 @@ static int dummy_inode_mknod (struct inode *inode, struct dentry *dentry,
return 0;
}
static void dummy_inode_post_mknod (struct inode *inode, struct dentry *dentry,
int mode, dev_t dev)
{
return;
}
static int dummy_inode_rename (struct inode *old_inode,
struct dentry *old_dentry,
struct inode *new_inode,
@ -894,17 +870,13 @@ void security_fixup_ops (struct security_operations *ops)
set_to_dummy_if_null(ops, inode_free_security);
set_to_dummy_if_null(ops, inode_init_security);
set_to_dummy_if_null(ops, inode_create);
set_to_dummy_if_null(ops, inode_post_create);
set_to_dummy_if_null(ops, inode_link);
set_to_dummy_if_null(ops, inode_post_link);
set_to_dummy_if_null(ops, inode_unlink);
set_to_dummy_if_null(ops, inode_symlink);
set_to_dummy_if_null(ops, inode_post_symlink);
set_to_dummy_if_null(ops, inode_mkdir);
set_to_dummy_if_null(ops, inode_post_mkdir);
set_to_dummy_if_null(ops, inode_rmdir);
set_to_dummy_if_null(ops, inode_mknod);
set_to_dummy_if_null(ops, inode_post_mknod);
set_to_dummy_if_null(ops, inode_rename);
set_to_dummy_if_null(ops, inode_post_rename);
set_to_dummy_if_null(ops, inode_readlink);

111
security/selinux/hooks.c
View File

@ -1265,91 +1265,6 @@ static int inode_security_set_sid(struct inode *inode, u32 sid)
return 0;
}
/* Set the security attributes on a newly created file. */
static int post_create(struct inode *dir,
struct dentry *dentry)
{
struct task_security_struct *tsec;
struct inode *inode;
struct inode_security_struct *dsec;
struct superblock_security_struct *sbsec;
struct inode_security_struct *isec;
u32 newsid;
char *context;
unsigned int len;
int rc;
tsec = current->security;
dsec = dir->i_security;
sbsec = dir->i_sb->s_security;
inode = dentry->d_inode;
if (!inode) {
/* Some file system types (e.g. NFS) may not instantiate
a dentry for all create operations (e.g. symlink),
so we have to check to see if the inode is non-NULL. */
printk(KERN_WARNING "post_create: no inode, dir (dev=%s, "
"ino=%ld)\n", dir->i_sb->s_id, dir->i_ino);
return 0;
}
isec = inode->i_security;
if (isec->security_attr_init)
return 0;
if (tsec->create_sid && sbsec->behavior != SECURITY_FS_USE_MNTPOINT) {
newsid = tsec->create_sid;
} else {
rc = security_transition_sid(tsec->sid, dsec->sid,
inode_mode_to_security_class(inode->i_mode),
&newsid);
if (rc) {
printk(KERN_WARNING "post_create: "
"security_transition_sid failed, rc=%d (dev=%s "
"ino=%ld)\n",
-rc, inode->i_sb->s_id, inode->i_ino);
return rc;
}
}
rc = inode_security_set_sid(inode, newsid);
if (rc) {
printk(KERN_WARNING "post_create: inode_security_set_sid "
"failed, rc=%d (dev=%s ino=%ld)\n",
-rc, inode->i_sb->s_id, inode->i_ino);
return rc;
}
if (sbsec->behavior == SECURITY_FS_USE_XATTR &&
inode->i_op->setxattr) {
/* Use extended attributes. */
rc = security_sid_to_context(newsid, &context, &len);
if (rc) {
printk(KERN_WARNING "post_create: sid_to_context "
"failed, rc=%d (dev=%s ino=%ld)\n",
-rc, inode->i_sb->s_id, inode->i_ino);
return rc;
}
down(&inode->i_sem);
rc = inode->i_op->setxattr(dentry,
XATTR_NAME_SELINUX,
context, len, 0);
up(&inode->i_sem);
kfree(context);
if (rc < 0) {
printk(KERN_WARNING "post_create: setxattr failed, "
"rc=%d (dev=%s ino=%ld)\n",
-rc, inode->i_sb->s_id, inode->i_ino);
return rc;
}
}
return 0;
}
/* Hook functions begin here. */
static int selinux_ptrace(struct task_struct *parent, struct task_struct *child)
@ -2076,8 +1991,6 @@ static int selinux_inode_init_security(struct inode *inode, struct inode *dir,
*len = clen;
}
isec->security_attr_init = 1;
return 0;
}
@ -2086,11 +1999,6 @@ static int selinux_inode_create(struct inode *dir, struct dentry *dentry, int ma
return may_create(dir, dentry, SECCLASS_FILE);
}
static void selinux_inode_post_create(struct inode *dir, struct dentry *dentry, int mask)
{
post_create(dir, dentry);
}
static int selinux_inode_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry)
{
int rc;
@ -2121,21 +2029,11 @@ static int selinux_inode_symlink(struct inode *dir, struct dentry *dentry, const
return may_create(dir, dentry, SECCLASS_LNK_FILE);
}
static void selinux_inode_post_symlink(struct inode *dir, struct dentry *dentry, const char *name)
{
post_create(dir, dentry);
}
static int selinux_inode_mkdir(struct inode *dir, struct dentry *dentry, int mask)
{
return may_create(dir, dentry, SECCLASS_DIR);
}
static void selinux_inode_post_mkdir(struct inode *dir, struct dentry *dentry, int mask)
{
post_create(dir, dentry);
}
static int selinux_inode_rmdir(struct inode *dir, struct dentry *dentry)
{
return may_link(dir, dentry, MAY_RMDIR);
@ -2152,11 +2050,6 @@ static int selinux_inode_mknod(struct inode *dir, struct dentry *dentry, int mod
return may_create(dir, dentry, inode_mode_to_security_class(mode));
}
static void selinux_inode_post_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
{
post_create(dir, dentry);
}
static int selinux_inode_rename(struct inode *old_inode, struct dentry *old_dentry,
struct inode *new_inode, struct dentry *new_dentry)
{
@ -4363,17 +4256,13 @@ static struct security_operations selinux_ops = {
.inode_free_security = selinux_inode_free_security,
.inode_init_security = selinux_inode_init_security,
.inode_create = selinux_inode_create,
.inode_post_create = selinux_inode_post_create,
.inode_link = selinux_inode_link,
.inode_post_link = selinux_inode_post_link,
.inode_unlink = selinux_inode_unlink,
.inode_symlink = selinux_inode_symlink,
.inode_post_symlink = selinux_inode_post_symlink,
.inode_mkdir = selinux_inode_mkdir,
.inode_post_mkdir = selinux_inode_post_mkdir,
.inode_rmdir = selinux_inode_rmdir,
.inode_mknod = selinux_inode_mknod,
.inode_post_mknod = selinux_inode_post_mknod,
.inode_rename = selinux_inode_rename,
.inode_post_rename = selinux_inode_post_rename,
.inode_readlink = selinux_inode_readlink,

1
security/selinux/include/objsec.h
View File

@ -46,7 +46,6 @@ struct inode_security_struct {
unsigned char initialized; /* initialization flag */
struct semaphore sem;
unsigned char inherit; /* inherit SID from parent entry */
unsigned char security_attr_init; /* security attributes init flag */
};
struct file_security_struct {