[PATCH v4 35/54] convert selinuxfs
From: Al Viro <viro@zeniv.linux.org.uk>
Date: 2025-11-18 05:16:11
Also in:
bpf, linux-efi, linux-fsdevel, linux-mm, linux-usb, ocfs2-devel, selinux
Subsystem:
selinux security module, the rest · Maintainers:
Paul Moore, Stephen Smalley, Linus Torvalds
Tree has invariant part + two subtrees that get replaced upon each policy load. Invariant parts stay for the lifetime of filesystem, these two subdirs - from policy load to policy load (serialized on lock_rename(root, ...)). All object creations are via d_alloc_name()+d_add() inside selinuxfs, all removals are via simple_recursive_removal(). Turn those d_add() into d_make_persistent()+dput() and that's mostly it. Acked-by: Paul Moore <paul@paul-moore.com> Reviewed-by: Stephen Smalley <stephen.smalley.work@gmail.com> Tested-by: Stephen Smalley <stephen.smalley.work@gmail.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> --- security/selinux/selinuxfs.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c
index f088776dbbd3..eae565358db4 100644
--- a/security/selinux/selinuxfs.c
+++ b/security/selinux/selinuxfs.c@@ -1205,7 +1205,8 @@ static struct dentry *sel_attach(struct dentry *parent, const char *name, iput(inode); return ERR_PTR(-ENOMEM); } - d_add(dentry, inode); + d_make_persistent(dentry, inode); + dput(dentry); return dentry; }
@@ -1934,10 +1935,11 @@ static struct dentry *sel_make_swapover_dir(struct super_block *sb, /* directory inodes start off with i_nlink == 2 (for "." entry) */ inc_nlink(inode); inode_lock(sb->s_root->d_inode); - d_add(dentry, inode); + d_make_persistent(dentry, inode); inc_nlink(sb->s_root->d_inode); inode_unlock(sb->s_root->d_inode); - return dentry; + dput(dentry); + return dentry; // borrowed } #define NULL_FILE_NAME "null"
@@ -2080,7 +2082,7 @@ static int sel_init_fs_context(struct fs_context *fc) static void sel_kill_sb(struct super_block *sb) { selinux_fs_info_free(sb); - kill_litter_super(sb); + kill_anon_super(sb); } static struct file_system_type sel_fs_type = {
--
2.47.3