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ramfs: Initialize security of in-memory inodes 

Add a call security_inode_init_security() after ramfs_get_inode(), to let
LSMs initialize the inode security field. Skip ramfs_fill_super(), as the
initialization is done through the sb_set_mnt_opts hook.

Calling security_inode_init_security() call inside ramfs_get_inode() is
not possible since, for CONFIG_SHMEM=n, tmpfs also calls the former after
the latter.

Pass NULL as initxattrs() callback to security_inode_init_security(), since
the purpose of the call is only to initialize the in-memory inodes.

Cc: Hugh Dickins <hughd@google.com>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
This commit is contained in:
Roberto Sassu 2023-11-16 10:01:25 +01:00 committed by Casey Schaufler
parent e63d86b8b7
commit f0816d4332
1 changed files with 31 additions and 1 deletions
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32
fs/ramfs/inode.c
View File

@ -102,11 +102,20 @@ ramfs_mknod(struct mnt_idmap *idmap, struct inode *dir,
int error = -ENOSPC;
if (inode) {
error = security_inode_init_security(inode, dir,
&dentry->d_name, NULL,
NULL);
if (error) {
iput(inode);
goto out;
}
d_instantiate(dentry, inode);
dget(dentry); /* Extra count - pin the dentry in core */
error = 0;
inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
}
out:
return error;
}
@ -134,6 +143,15 @@ static int ramfs_symlink(struct mnt_idmap *idmap, struct inode *dir,
inode = ramfs_get_inode(dir->i_sb, dir, S_IFLNK|S_IRWXUGO, 0);
if (inode) {
int l = strlen(symname)+1;
error = security_inode_init_security(inode, dir,
&dentry->d_name, NULL,
NULL);
if (error) {
iput(inode);
goto out;
}
error = page_symlink(inode, symname, l);
if (!error) {
d_instantiate(dentry, inode);
@ -143,6 +161,7 @@ static int ramfs_symlink(struct mnt_idmap *idmap, struct inode *dir,
} else
iput(inode);
}
out:
return error;
}
@ -150,12 +169,23 @@ static int ramfs_tmpfile(struct mnt_idmap *idmap,
struct inode *dir, struct file *file, umode_t mode)
{
struct inode *inode;
int error;
inode = ramfs_get_inode(dir->i_sb, dir, mode, 0);
if (!inode)
return -ENOSPC;
error = security_inode_init_security(inode, dir,
&file_dentry(file)->d_name, NULL,
NULL);
if (error) {
iput(inode);
goto out;
}
d_tmpfile(file, inode);
return finish_open_simple(file, 0);
out:
return finish_open_simple(file, error);
}
static const struct inode_operations ramfs_dir_inode_operations = {