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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
54 changed files with 112 additions and 91 deletions
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4
fs/reiserfs/ioctl.c
View File

@@ -59,7 +59,7 @@ long reiserfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
if (err)
break;
if (!inode_owner_or_capable(inode)) {
if (!inode_owner_or_capable(&init_user_ns, inode)) {
err = -EPERM;
goto setflags_out;
}
@@ -101,7 +101,7 @@ setflags_out:
err = put_user(inode->i_generation, (int __user *)arg);
break;
case REISERFS_IOC_SETVERSION:
if (!inode_owner_or_capable(inode)) {
if (!inode_owner_or_capable(&init_user_ns, inode)) {
err = -EPERM;
break;
}

2
fs/reiserfs/namei.c
View File

@@ -615,7 +615,7 @@ static int new_inode_init(struct inode *inode, struct inode *dir, umode_t mode)
* the quota init calls have to know who to charge the quota to, so
* we have to set uid and gid here
*/
inode_init_owner(inode, dir, mode);
inode_init_owner(&init_user_ns, inode, dir, mode);
return dquot_initialize(inode);
}