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inode: make init and permission helpers idmapped mount aware

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The inode_owner_or_capable() helper determines whether the caller is the
owner of the inode or is capable with respect to that inode. Allow it to
handle idmapped mounts. If the inode is accessed through an idmapped
mount it according to the mount's user namespace. Afterwards the checks
are identical to non-idmapped mounts. If the initial user namespace is
passed nothing changes so non-idmapped mounts will see identical
behavior as before.

Similarly, allow the inode_init_owner() helper to handle idmapped
mounts. It initializes a new inode on idmapped mounts by mapping the
fsuid and fsgid of the caller from 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/20210121131959.646623-7-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>
Reviewed-by: James Morris <jamorris@linux.microsoft.com>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
This commit is contained in:
Christian Brauner 2021-01-21 14:19:25 +01:00
parent 47291baa8d
commit 21cb47be6f
No known key found for this signature in database
GPG key ID: 91C61BC06578DCA2
54 changed files with 112 additions and 91 deletions
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2
fs/jfs/ioctl.c
View file

@ -76,7 +76,7 @@ long jfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
if (err)
return err;
if (!inode_owner_or_capable(inode)) {
if (!inode_owner_or_capable(&init_user_ns, inode)) {
err = -EACCES;
goto setflags_out;
}

2
fs/jfs/jfs_inode.c
View file

@ -64,7 +64,7 @@ struct inode *ialloc(struct inode *parent, umode_t mode)
goto fail_put;
}
inode_init_owner(inode, parent, mode);
inode_init_owner(&init_user_ns, inode, parent, mode);
/*
* New inodes need to save sane values on disk when
* uid & gid mount options are used