Merge tag 'lsm-pr-20230420' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/lsm

08e30833 · Linus Torvalds <[email protected]> · 2023-04-24 11:21:50 -07:00

Pull lsm updates from Paul Moore:

 - Move the LSM hook comment blocks into security/security.c

   For many years the LSM hook comment blocks were located in a very odd
   place, include/linux/lsm_hooks.h, where they lived on their own,
   disconnected from both the function prototypes and definitions.

   In keeping with current kernel conventions, this moves all of these
   comment blocks to the top of the function definitions, transforming
   them into the kdoc format in the process. This should make it much
   easier to maintain these comments, which are the main source of LSM
   hook documentation.

   For the most part the comment contents were left as-is, although some
   glaring errors were corrected. Expect additional edits in the future
   as we slowly update and correct the comment blocks.

   This is the bulk of the diffstat.

 - Introduce LSM_ORDER_LAST

   Similar to how LSM_ORDER_FIRST is used to specify LSMs which should
   be ordered before "normal" LSMs, the LSM_ORDER_LAST is used to
   specify LSMs which should be ordered after "normal" LSMs.

   This is one of the prerequisites for transitioning IMA/EVM to a
   proper LSM.

 - Remove the security_old_inode_init_security() hook

   The security_old_inode_init_security() LSM hook only allows for a
   single xattr which is problematic both for LSM stacking and the
   IMA/EVM-as-a-LSM effort. This finishes the conversion over to the
   security_inode_init_security() hook and removes the single-xattr LSM
   hook.

 - Fix a reiserfs problem with security xattrs

   During the security_old_inode_init_security() removal work it became
   clear that reiserfs wasn't handling security xattrs properly so we
   fixed it.

* tag 'lsm-pr-20230420' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/lsm: (32 commits)
  reiserfs: Add security prefix to xattr name in reiserfs_security_write()
  security: Remove security_old_inode_init_security()
  ocfs2: Switch to security_inode_init_security()
  reiserfs: Switch to security_inode_init_security()
  security: Remove integrity from the LSM list in Kconfig
  Revert "integrity: double check iint_cache was initialized"
  security: Introduce LSM_ORDER_LAST and set it for the integrity LSM
  device_cgroup: Fix typo in devcgroup_css_alloc description
  lsm: fix a badly named parameter in security_get_getsecurity()
  lsm: fix doc warnings in the LSM hook comments
  lsm: styling fixes to security/security.c
  lsm: move the remaining LSM hook comments to security/security.c
  lsm: move the io_uring hook comments to security/security.c
  lsm: move the perf hook comments to security/security.c
  lsm: move the bpf hook comments to security/security.c
  lsm: move the audit hook comments to security/security.c
  lsm: move the binder hook comments to security/security.c
  lsm: move the sysv hook comments to security/security.c
  lsm: move the key hook comments to security/security.c
  lsm: move the xfrm hook comments to security/security.c
  ...

Commit: 08e30833f86ba25945e416b9f372791aacfef153
Parents: 72eaa096 · d82dcd9e

Merge commit. Changes below are compared with the first parent: 72eaa096.

Changes

10 files changed · +2695 −1768

File	Status	Add	Del	Content
fs/ocfs2/namei.c	modified	+2	−0	View file
fs/ocfs2/xattr.c	modified	+26	−4	View file
fs/reiserfs/xattr_security.c	modified	+24	−7	View file
include/linux/lsm_hook_defs.h	modified	+1	−1	View file
include/linux/lsm_hooks.h	modified	+1	−1624	View file
include/linux/security.h	modified	+0	−12	View file
security/Kconfig	modified	+9	−7	View file
security/device_cgroup.c	modified	+1	−1	View file
security/integrity/iint.c	modified	+1	−8	View file
security/security.c	modified	+2630	−104	View file

Only the first 600 diff lines are shown. Download the complete patch.

fs/ocfs2/namei.c

View file

diff --git a/fs/ocfs2/namei.c b/fs/ocfs2/namei.c
index 9175dbc..17c5222 100644
--- a/fs/ocfs2/namei.c
+++ b/fs/ocfs2/namei.c
@@ -242,6 +242,7 @@ static int ocfs2_mknod(struct mnt_idmap *idmap,
 	int want_meta = 0;
 	int xattr_credits = 0;
 	struct ocfs2_security_xattr_info si = {
+		.name = NULL,
 		.enable = 1,
 	};
 	int did_quota_inode = 0;
@@ -1805,6 +1806,7 @@ static int ocfs2_symlink(struct mnt_idmap *idmap,
 	int want_clusters = 0;
 	int xattr_credits = 0;
 	struct ocfs2_security_xattr_info si = {
+		.name = NULL,
 		.enable = 1,
 	};
 	int did_quota = 0, did_quota_inode = 0;

fs/ocfs2/xattr.c

View file

diff --git a/fs/ocfs2/xattr.c b/fs/ocfs2/xattr.c
index 389308e..469ec45 100644
--- a/fs/ocfs2/xattr.c
+++ b/fs/ocfs2/xattr.c
@@ -7259,9 +7259,21 @@ static int ocfs2_xattr_security_set(const struct xattr_handler *handler,
 static int ocfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
 		     void *fs_info)
 {
+	struct ocfs2_security_xattr_info *si = fs_info;
 	const struct xattr *xattr;
 	int err = 0;
 
+	if (si) {
+		si->value = kmemdup(xattr_array->value, xattr_array->value_len,
+				    GFP_KERNEL);
+		if (!si->value)
+			return -ENOMEM;
+
+		si->name = xattr_array->name;
+		si->value_len = xattr_array->value_len;
+		return 0;
+	}
+
 	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
 		err = ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_SECURITY,
 				      xattr->name, xattr->value,
@@ -7277,13 +7289,23 @@ int ocfs2_init_security_get(struct inode *inode,
 			    const struct qstr *qstr,
 			    struct ocfs2_security_xattr_info *si)
 {
+	int ret;
+
 	/* check whether ocfs2 support feature xattr */
 	if (!ocfs2_supports_xattr(OCFS2_SB(dir->i_sb)))
 		return -EOPNOTSUPP;
-	if (si)
-		return security_old_inode_init_security(inode, dir, qstr,
-							&si->name, &si->value,
-							&si->value_len);
+	if (si) {
+		ret = security_inode_init_security(inode, dir, qstr,
+						   &ocfs2_initxattrs, si);
+		/*
+		 * security_inode_init_security() does not return -EOPNOTSUPP,
+		 * we have to check the xattr ourselves.
+		 */
+		if (!ret && !si->name)
+			si->enable = 0;
+
+		return ret;
+	}
 
 	return security_inode_init_security(inode, dir, qstr,
 					    &ocfs2_initxattrs, NULL);

fs/reiserfs/xattr_security.c

View file

diff --git a/fs/reiserfs/xattr_security.c b/fs/reiserfs/xattr_security.c
index 41c0ea8..6e0a099 100644
--- a/fs/reiserfs/xattr_security.c
+++ b/fs/reiserfs/xattr_security.c
@@ -39,6 +39,22 @@ static bool security_list(struct dentry *dentry)
 	return !IS_PRIVATE(d_inode(dentry));
 }
 
+static int
+reiserfs_initxattrs(struct inode *inode, const struct xattr *xattr_array,
+		    void *fs_info)
+{
+	struct reiserfs_security_handle *sec = fs_info;
+
+	sec->value = kmemdup(xattr_array->value, xattr_array->value_len,
+			     GFP_KERNEL);
+	if (!sec->value)
+		return -ENOMEM;
+
+	sec->name = xattr_array->name;
+	sec->length = xattr_array->value_len;
+	return 0;
+}
+
 /* Initializes the security context for a new inode and returns the number
  * of blocks needed for the transaction. If successful, reiserfs_security
  * must be released using reiserfs_security_free when the caller is done. */
@@ -56,12 +72,9 @@ int reiserfs_security_init(struct inode *dir, struct inode *inode,
 	if (IS_PRIVATE(dir))
 		return 0;
 
-	error = security_old_inode_init_security(inode, dir, qstr, &sec->name,
-						 &sec->value, &sec->length);
+	error = security_inode_init_security(inode, dir, qstr,
+					     &reiserfs_initxattrs, sec);
 	if (error) {
-		if (error == -EOPNOTSUPP)
-			error = 0;
-
 		sec->name = NULL;
 		sec->value = NULL;
 		sec->length = 0;
@@ -82,11 +95,15 @@ int reiserfs_security_write(struct reiserfs_transaction_handle *th,
 			    struct inode *inode,
 			    struct reiserfs_security_handle *sec)
 {
+	char xattr_name[XATTR_NAME_MAX + 1] = XATTR_SECURITY_PREFIX;
 	int error;
-	if (strlen(sec->name) < sizeof(XATTR_SECURITY_PREFIX))
+
+	if (XATTR_SECURITY_PREFIX_LEN + strlen(sec->name) > XATTR_NAME_MAX)
 		return -EINVAL;
 
-	error = reiserfs_xattr_set_handle(th, inode, sec->name, sec->value,
+	strlcat(xattr_name, sec->name, sizeof(xattr_name));
+
+	error = reiserfs_xattr_set_handle(th, inode, xattr_name, sec->value,
 					  sec->length, XATTR_CREATE);
 	if (error == -ENODATA || error == -EOPNOTSUPP)
 		error = 0;

include/linux/lsm_hook_defs.h

View file

diff --git a/include/linux/lsm_hook_defs.h b/include/linux/lsm_hook_defs.h
index 094b76d..6bb55e6 100644
--- a/include/linux/lsm_hook_defs.h
+++ b/include/linux/lsm_hook_defs.h
@@ -381,7 +381,7 @@ LSM_HOOK(int, 0, key_alloc, struct key *key, const struct cred *cred,
 LSM_HOOK(void, LSM_RET_VOID, key_free, struct key *key)
 LSM_HOOK(int, 0, key_permission, key_ref_t key_ref, const struct cred *cred,
 	 enum key_need_perm need_perm)
-LSM_HOOK(int, 0, key_getsecurity, struct key *key, char **_buffer)
+LSM_HOOK(int, 0, key_getsecurity, struct key *key, char **buffer)
 #endif /* CONFIG_KEYS */
 
 #ifdef CONFIG_AUDIT

include/linux/lsm_hooks.h

View file

diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
index 60cdc83..ab2b2fa 100644
--- a/include/linux/lsm_hooks.h
+++ b/include/linux/lsm_hooks.h
@@ -29,1630 +29,6 @@
 #include <linux/init.h>
 #include <linux/rculist.h>
 
-/**
- * union security_list_options - Linux Security Module hook function list
- *
- * Security hooks for program execution operations.
- *
- * @bprm_creds_for_exec:
- *	If the setup in prepare_exec_creds did not setup @bprm->cred->security
- *	properly for executing @bprm->file, update the LSM's portion of
- *	@bprm->cred->security to be what commit_creds needs to install for the
- *	new program.  This hook may also optionally check permissions
- *	(e.g. for transitions between security domains).
- *	The hook must set @bprm->secureexec to 1 if AT_SECURE should be set to
- *	request libc enable secure mode.
- *	@bprm contains the linux_binprm structure.
- *	Return 0 if the hook is successful and permission is granted.
- * @bprm_creds_from_file:
- *	If @file is setpcap, suid, sgid or otherwise marked to change
- *	privilege upon exec, update @bprm->cred to reflect that change.
- *	This is called after finding the binary that will be executed.
- *	without an interpreter.  This ensures that the credentials will not
- *	be derived from a script that the binary will need to reopen, which
- *	when reopend may end up being a completely different file.  This
- *	hook may also optionally check permissions (e.g. for transitions
- *	between security domains).
- *	The hook must set @bprm->secureexec to 1 if AT_SECURE should be set to
- *	request libc enable secure mode.
- *	The hook must add to @bprm->per_clear any personality flags that
- * 	should be cleared from current->personality.
- *	@bprm contains the linux_binprm structure.
- *	Return 0 if the hook is successful and permission is granted.
- * @bprm_check_security:
- *	This hook mediates the point when a search for a binary handler will
- *	begin.  It allows a check against the @bprm->cred->security value
- *	which was set in the preceding creds_for_exec call.  The argv list and
- *	envp list are reliably available in @bprm.  This hook may be called
- *	multiple times during a single execve.
- *	@bprm contains the linux_binprm structure.
- *	Return 0 if the hook is successful and permission is granted.
- * @bprm_committing_creds:
- *	Prepare to install the new security attributes of a process being
- *	transformed by an execve operation, based on the old credentials
- *	pointed to by @current->cred and the information set in @bprm->cred by
- *	the bprm_creds_for_exec hook.  @bprm points to the linux_binprm
- *	structure.  This hook is a good place to perform state changes on the
- *	process such as closing open file descriptors to which access will no
- *	longer be granted when the attributes are changed.  This is called
- *	immediately before commit_creds().
- * @bprm_committed_creds:
- *	Tidy up after the installation of the new security attributes of a
- *	process being transformed by an execve operation.  The new credentials
- *	have, by this point, been set to @current->cred.  @bprm points to the
- *	linux_binprm structure.  This hook is a good place to perform state
- *	changes on the process such as clearing out non-inheritable signal
- *	state.  This is called immediately after commit_creds().
- *
- * Security hooks for mount using fs_context.
- *	[See also Documentation/filesystems/mount_api.rst]
- *
- * @fs_context_dup:
- *	Allocate and attach a security structure to sc->security.  This pointer
- *	is initialised to NULL by the caller.
- *	@fc indicates the new filesystem context.
- *	@src_fc indicates the original filesystem context.
- *	Return 0 on success or a negative error code on failure.
- * @fs_context_parse_param:
- *	Userspace provided a parameter to configure a superblock.  The LSM may
- *	reject it with an error and may use it for itself, in which case it
- *	should return 0; otherwise it should return -ENOPARAM to pass it on to
- *	the filesystem.
- *	@fc indicates the filesystem context.
- *	@param The parameter.
- *
- * Security hooks for filesystem operations.
- *
- * @sb_alloc_security:
- *	Allocate and attach a security structure to the sb->s_security field.
- *	The s_security field is initialized to NULL when the structure is
- *	allocated.
- *	@sb contains the super_block structure to be modified.
- *	Return 0 if operation was successful.
- * @sb_delete:
- *	Release objects tied to a superblock (e.g. inodes).
- *	@sb contains the super_block structure being released.
- * @sb_free_security:
- *	Deallocate and clear the sb->s_security field.
- *	@sb contains the super_block structure to be modified.
- * @sb_free_mnt_opts:
- * 	Free memory associated with @mnt_ops.
- * @sb_eat_lsm_opts:
- * 	Eat (scan @orig options) and save them in @mnt_opts.
- *	Return 0 on success, negative values on failure.
- * @sb_statfs:
- *	Check permission before obtaining filesystem statistics for the @mnt
- *	mountpoint.
- *	@dentry is a handle on the superblock for the filesystem.
- *	Return 0 if permission is granted.
- * @sb_mount:
- *	Check permission before an object specified by @dev_name is mounted on
- *	the mount point named by @nd.  For an ordinary mount, @dev_name
- *	identifies a device if the file system type requires a device.  For a
- *	remount (@flags & MS_REMOUNT), @dev_name is irrelevant.  For a
- *	loopback/bind mount (@flags & MS_BIND), @dev_name identifies the
- *	pathname of the object being mounted.
- *	@dev_name contains the name for object being mounted.
- *	@path contains the path for mount point object.
- *	@type contains the filesystem type.
- *	@flags contains the mount flags.
- *	@data contains the filesystem-specific data.
- *	Return 0 if permission is granted.
- * @sb_mnt_opts_compat:
- *	Determine if the new mount options in @mnt_opts are allowed given
- *	the existing mounted filesystem at @sb.
- *	@sb superblock being compared.
- *	@mnt_opts new mount options.
- *	Return 0 if options are compatible.
- * @sb_remount:
- *	Extracts security system specific mount options and verifies no changes
- *	are being made to those options.
- *	@sb superblock being remounted.
- *	@data contains the filesystem-specific data.
- *	Return 0 if permission is granted.
- * @sb_kern_mount:
- *	Mount this @sb if allowed by permissions.
- *	Return 0 if permission is granted.
- * @sb_show_options:
- * 	Show (print on @m) mount options for this @sb.
- *	Return 0 on success, negative values on failure.
- * @sb_umount:
- *	Check permission before the @mnt file system is unmounted.
- *	@mnt contains the mounted file system.
- *	@flags contains the unmount flags, e.g. MNT_FORCE.
- *	Return 0 if permission is granted.
- * @sb_pivotroot:
- *	Check permission before pivoting the root filesystem.
- *	@old_path contains the path for the new location of the
- *	current root (put_old).
- *	@new_path contains the path for the new root (new_root).
- *	Return 0 if permission is granted.
- * @sb_set_mnt_opts:
- *	Set the security relevant mount options used for a superblock
- *	@sb the superblock to set security mount options for.
- *	@opts binary data structure containing all lsm mount data.
- *	Return 0 on success, error on failure.
- * @sb_clone_mnt_opts:
- *	Copy all security options from a given superblock to another
- *	@oldsb old superblock which contain information to clone.
- *	@newsb new superblock which needs filled in.
- *	Return 0 on success, error on failure.
- * @move_mount:
- *	Check permission before a mount is moved.
- *	@from_path indicates the mount that is going to be moved.
- *	@to_path indicates the mountpoint that will be mounted upon.
- *	Return 0 if permission is granted.
- * @dentry_init_security:
- *	Compute a context for a dentry as the inode is not yet available
- *	since NFSv4 has no label backed by an EA anyway.
- *	@dentry dentry to use in calculating the context.
- *	@mode mode used to determine resource type.
- *	@name name of the last path component used to create file.
- *	@xattr_name pointer to place the pointer to security xattr name.
- *		    Caller does not have to free the resulting pointer. Its
- *		    a pointer to static string.
- *	@ctx pointer to place the pointer to the resulting context in.
- *	@ctxlen point to place the length of the resulting context.
- *	Return 0 on success, negative values on failure.
- * @dentry_create_files_as:
- *	Compute a context for a dentry as the inode is not yet available
- *	and set that context in passed in creds so that new files are
- *	created using that context. Context is calculated using the
- *	passed in creds and not the creds of the caller.
- *	@dentry dentry to use in calculating the context.
- *	@mode mode used to determine resource type.
- *	@name name of the last path component used to create file.
- *	@old creds which should be used for context calculation.
- *	@new creds to modify.
- *	Return 0 on success, error on failure.
- *
- *
- * Security hooks for inode operations.
- *
- * @inode_alloc_security:
- *	Allocate and attach a security structure to @inode->i_security.  The
- *	i_security field is initialized to NULL when the inode structure is
- *	allocated.
- *	@inode contains the inode structure.
- *	Return 0 if operation was successful.
- * @inode_free_security:
- *	@inode contains the inode structure.
- *	Deallocate the inode security structure and set @inode->i_security to
- *	NULL.
- * @inode_init_security:
- *	Obtain the security attribute name suffix and value to set on a newly
- *	created inode and set up the incore security field for the new inode.
- *	This hook is called by the fs code as part of the inode creation
- *	transaction and provides for atomic labeling of the inode, unlike
- *	the post_create/mkdir/... hooks called by the VFS.  The hook function
- *	is expected to allocate the name and value via kmalloc, with the caller
- *	being responsible for calling kfree after using them.
- *	If the security module does not use security attributes or does
- *	not wish to put a security attribute on this particular inode,
- *	then it should return -EOPNOTSUPP to skip this processing.
- *	@inode contains the inode structure of the newly created inode.
- *	@dir contains the inode structure of the parent directory.
- *	@qstr contains the last path component of the new object.
- *	@name will be set to the allocated name suffix (e.g. selinux).
- *	@value will be set to the allocated attribute value.
- *	@len will be set to the length of the value.
- *	Returns 0 if @name and @value have been successfully set,
- *	-EOPNOTSUPP if no security attribute is needed, or
- *	-ENOMEM on memory allocation failure.
- * @inode_init_security_anon:
- *      Set up the incore security field for the new anonymous inode
- *      and return whether the inode creation is permitted by the security
- *      module or not.
- *      @inode contains the inode structure.
- *      @name name of the anonymous inode class.
- *      @context_inode optional related inode.
- *	Returns 0 on success, -EACCES if the security module denies the
- *	creation of this inode, or another -errno upon other errors.
- * @inode_create:
- *	Check permission to create a regular file.
- *	@dir contains inode structure of the parent of the new file.
- *	@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_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.
- *	@dir contains the inode structure of the parent directory
- *	of the new link.
- *	@new_dentry contains the dentry structure for the new link.
- *	Return 0 if permission is granted.
- * @path_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.
- *	@new_dir contains the path structure of the parent directory of
- *	the new link.
- *	@new_dentry contains the dentry structure for the new link.
- *	Return 0 if permission is granted.
- * @inode_unlink:
- *	Check the permission to remove a hard link to a file.
- *	@dir contains the inode structure of parent directory of the file.
- *	@dentry contains the dentry structure for file to be unlinked.
- *	Return 0 if permission is granted.
- * @path_unlink:
- *	Check the permission to remove a hard link to a file.
- *	@dir contains the path structure of parent directory of the file.
- *	@dentry contains the dentry structure for file to be unlinked.
- *	Return 0 if permission is granted.
- * @inode_symlink:
- *	Check the permission to create a symbolic link to a file.
- *	@dir contains the inode structure of parent directory of
- *	the symbolic link.
- *	@dentry contains the dentry structure of the symbolic link.
- *	@old_name contains the pathname of file.
- *	Return 0 if permission is granted.
- * @path_symlink:
- *	Check the permission to create a symbolic link to a file.
- *	@dir contains the path structure of parent directory of
- *	the symbolic link.
- *	@dentry contains the dentry structure of the symbolic link.
- *	@old_name contains the pathname of file.
- *	Return 0 if permission is granted.
- * @inode_mkdir:
- *	Check permissions to create a new directory in the existing directory
- *	associated with inode structure @dir.
- *	@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.
- *	Return 0 if permission is granted.
- * @path_mkdir:
- *	Check permissions to create a new directory in the existing directory
- *	associated with path structure @path.
- *	@dir contains the path structure of parent of the directory
- *	to be created.
- *	@dentry contains the dentry structure of new directory.
- *	@mode contains the mode of new directory.
- *	Return 0 if permission is granted.
- * @inode_rmdir:
- *	Check the permission to remove a directory.
- *	@dir contains the inode structure of parent of the directory
- *	to be removed.
- *	@dentry contains the dentry structure of directory to be removed.
- *	Return 0 if permission is granted.
- * @path_rmdir:
- *	Check the permission to remove a directory.
- *	@dir contains the path structure of parent of the directory to be
- *	removed.
- *	@dentry contains the dentry structure of directory to be removed.
- *	Return 0 if permission is granted.
- * @inode_mknod:
- *	Check permissions when creating a special file (or a socket or a fifo
- *	file created via the mknod system call).  Note that if mknod operation
- *	is being done for a regular file, then the create hook will be called
- *	and not this hook.
- *	@dir contains the inode structure of parent of the new file.
- *	@dentry contains the dentry structure of the new file.
- *	@mode contains the mode of the new file.
- *	@dev contains the device number.
- *	Return 0 if permission is granted.
- * @path_mknod:
- *	Check permissions when creating a file. Note that this hook is called
- *	even if mknod operation is being done for a regular file.
- *	@dir contains the path structure of parent of the new file.
- *	@dentry contains the dentry structure of the new file.
- *	@mode contains the mode of the new file.
- *	@dev contains the undecoded device number. Use new_decode_dev() to get
- *	the decoded device number.
- *	Return 0 if permission is granted.
- * @inode_rename:
- *	Check for permission to rename a file or directory.
- *	@old_dir contains the inode structure for parent of the old link.
- *	@old_dentry contains the dentry structure of the old link.
- *	@new_dir contains the inode structure for parent of the new link.
- *	@new_dentry contains the dentry structure of the new link.
- *	Return 0 if permission is granted.
- * @path_rename:
- *	Check for permission to rename a file or directory.
- *	@old_dir contains the path structure for parent of the old link.
- *	@old_dentry contains the dentry structure of the old link.
- *	@new_dir contains the path structure for parent of the new link.
- *	@new_dentry contains the dentry structure of the new link.
- *	@flags may contain rename options such as RENAME_EXCHANGE.
- *	Return 0 if permission is granted.
- * @path_chmod:
- *	Check for permission to change a mode of the file @path. The new
- *	mode is specified in @mode.
- *	@path contains the path structure of the file to change the mode.
- *	@mode contains the new DAC's permission, which is a bitmask of
- *	constants from <include/uapi/linux/stat.h>.
- *	Return 0 if permission is granted.
- * @path_chown:
- *	Check for permission to change owner/group of a file or directory.
- *	@path contains the path structure.
- *	@uid contains new owner's ID.
- *	@gid contains new group's ID.
- *	Return 0 if permission is granted.
- * @path_chroot:
- *	Check for permission to change root directory.
- *	@path contains the path structure.
- *	Return 0 if permission is granted.
- * @path_notify:
- *	Check permissions before setting a watch on events as defined by @mask,
- *	on an object at @path, whose type is defined by @obj_type.
- *	Return 0 if permission is granted.
- * @inode_readlink:
- *	Check the permission to read the symbolic link.
- *	@dentry contains the dentry structure for the file link.
- *	Return 0 if permission is granted.
- * @inode_follow_link:
- *	Check permission to follow a symbolic link when looking up a pathname.
- *	@dentry contains the dentry structure for the link.
- *	@inode contains the inode, which itself is not stable in RCU-walk.
- *	@rcu indicates whether we are in RCU-walk mode.
- *	Return 0 if permission is granted.
- * @inode_permission:
- *	Check permission before accessing an inode.  This hook is called by the
- *	existing Linux permission function, so a security module can use it to
- *	provide additional checking for existing Linux permission checks.
- *	Notice that this hook is called when a file is opened (as well as many
- *	other operations), whereas the file_security_ops permission hook is
- *	called when the actual read/write operations are performed.
- *	@inode contains the inode structure to check.
- *	@mask contains the permission mask.
- *	Return 0 if permission is granted.
- * @inode_setattr:
- *	Check permission before setting file attributes.  Note that the kernel
- *	call to notify_change is performed from several locations, whenever
- *	file attributes change (such as when a file is truncated, chown/chmod
- *	operations, transferring disk quotas, etc).
- *	@dentry contains the dentry structure for the file.
- *	@attr is the iattr structure containing the new file attributes.
- *	Return 0 if permission is granted.
- * @path_truncate:
- *	Check permission before truncating the file indicated by path.
- *	Note that truncation permissions may also be checked based on
- *	already opened files, using the @file_truncate hook.
- *	@path contains the path structure for the file.
- *	Return 0 if permission is granted.
- * @inode_getattr:
- *	Check permission before obtaining file attributes.
- *	@path contains the path structure for the file.
- *	Return 0 if permission is granted.
- * @inode_setxattr:
- *	Check permission before setting the extended attributes
- *	@value identified by @name for @dentry.
- *	Return 0 if permission is granted.
- * @inode_post_setxattr:
- *	Update inode security field after successful setxattr operation.
- *	@value identified by @name for @dentry.
- * @inode_getxattr:
- *	Check permission before obtaining the extended attributes
- *	identified by @name for @dentry.
- *	Return 0 if permission is granted.
- * @inode_listxattr:
- *	Check permission before obtaining the list of extended attribute
- *	names for @dentry.
- *	Return 0 if permission is granted.
- * @inode_removexattr:
- *	Check permission before removing the extended attribute
- *	identified by @name for @dentry.
- *	Return 0 if permission is granted.
- * @inode_set_acl:
- *	Check permission before setting posix acls
- *	The posix acls in @kacl are identified by @acl_name.
- *	Return 0 if permission is granted.
- * @inode_get_acl:
- *	Check permission before getting osix acls
- *	The posix acls are identified by @acl_name.
- *	Return 0 if permission is granted.
- * @inode_remove_acl:
- *	Check permission before removing posix acls
- *	The posix acls are identified by @acl_name.
- *	Return 0 if permission is granted.
- * @inode_getsecurity:
- *	Retrieve a copy of the extended attribute representation of the
- *	security label associated with @name for @inode via @buffer.  Note that
- *	@name is the remainder of the attribute name after the security prefix
- *	has been removed. @alloc is used to specify if the call should return a
- *	value via the buffer or just the value length.
- *	Return size of buffer on success.
- * @inode_setsecurity:
- *	Set the security label associated with @name for @inode from the
- *	extended attribute value @value.  @size indicates the size of the
- *	@value in bytes.  @flags may be XATTR_CREATE, XATTR_REPLACE, or 0.
- *	Note that @name is the remainder of the attribute name after the
- *	security. prefix has been removed.
- *	Return 0 on success.
- * @inode_listsecurity:
- *	Copy the extended attribute names for the security labels
- *	associated with @inode into @buffer.  The maximum size of @buffer
- *	is specified by @buffer_size.  @buffer may be NULL to request
- *	the size of the buffer required.
- *	Returns number of bytes used/required on success.
- * @inode_need_killpriv:
- *	Called when an inode has been changed.
- *	@dentry is the dentry being changed.
- *	Return <0 on error to abort the inode change operation.
- *	Return 0 if inode_killpriv does not need to be called.
- *	Return >0 if inode_killpriv does need to be called.
- * @inode_killpriv:
- *	The setuid bit is being removed.  Remove similar security labels.

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include/linux/security.h

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security/Kconfig

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security/device_cgroup.c

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security/integrity/iint.c

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security/security.c

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