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init: handle idmapped mounts 

Enable the init helpers to handle idmapped mounts by passing down the
mount's user namespace. If the initial user namespace is passed nothing
changes so non-idmapped mounts will see identical behavior as before.

Link: https://lore.kernel.org/r/20210121131959.646623-21-christian.brauner@ubuntu.com
Cc: Christoph Hellwig <hch@lst.de>
Cc: David Howells <dhowells@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: linux-fsdevel@vger.kernel.org
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
This commit is contained in:
Christian Brauner 2021-01-21 14:19:39 +01:00
parent 9eccd12ce7
commit b816dd5dde
No known key found for this signature in database
GPG Key ID: 91C61BC06578DCA2
1 changed files with 11 additions and 9 deletions
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20
fs/init.c
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@ -157,8 +157,8 @@ int __init init_mknod(const char *filename, umode_t mode, unsigned int dev)
mode &= ~current_umask();
error = security_path_mknod(&path, dentry, mode, dev);
if (!error)
error = vfs_mknod(&init_user_ns, path.dentry->d_inode, dentry,
mode, new_decode_dev(dev));
error = vfs_mknod(mnt_user_ns(path.mnt), path.dentry->d_inode,
dentry, mode, new_decode_dev(dev));
done_path_create(&path, dentry);
return error;
}
@ -167,6 +167,7 @@ int __init init_link(const char *oldname, const char *newname)
{
struct dentry *new_dentry;
struct path old_path, new_path;
struct user_namespace *mnt_userns;
int error;
error = kern_path(oldname, 0, &old_path);
@ -181,14 +182,15 @@ int __init init_link(const char *oldname, const char *newname)
error = -EXDEV;
if (old_path.mnt != new_path.mnt)
goto out_dput;
error = may_linkat(&init_user_ns, &old_path);
mnt_userns = mnt_user_ns(new_path.mnt);
error = may_linkat(mnt_userns, &old_path);
if (unlikely(error))
goto out_dput;
error = security_path_link(old_path.dentry, &new_path, new_dentry);
if (error)
goto out_dput;
error = vfs_link(old_path.dentry, &init_user_ns,
new_path.dentry->d_inode, new_dentry, NULL);
error = vfs_link(old_path.dentry, mnt_userns, new_path.dentry->d_inode,
new_dentry, NULL);
out_dput:
done_path_create(&new_path, new_dentry);
out:
@ -207,8 +209,8 @@ int __init init_symlink(const char *oldname, const char *newname)
return PTR_ERR(dentry);
error = security_path_symlink(&path, dentry, oldname);
if (!error)
error = vfs_symlink(&init_user_ns, path.dentry->d_inode, dentry,
oldname);
error = vfs_symlink(mnt_user_ns(path.mnt), path.dentry->d_inode,
dentry, oldname);
done_path_create(&path, dentry);
return error;
}
@ -231,8 +233,8 @@ int __init init_mkdir(const char *pathname, umode_t mode)
mode &= ~current_umask();
error = security_path_mkdir(&path, dentry, mode);
if (!error)
error = vfs_mkdir(&init_user_ns, path.dentry->d_inode, dentry,
mode);
error = vfs_mkdir(mnt_user_ns(path.mnt), path.dentry->d_inode,
dentry, mode);
done_path_create(&path, dentry);
return error;
}