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authorChristian Brauner <christian.brauner@ubuntu.com>2021-01-21 14:19:24 +0100
committerChristian Brauner <christian.brauner@ubuntu.com>2021-01-24 14:27:16 +0100
commit47291baa8ddfdae10663624ff0a15ab165952708 (patch)
tree132a9486b82c5eada1c4b375f693522f0a04d629 /fs/overlayfs/util.c
parentcapability: handle idmapped mounts (diff)
downloadlinux-47291baa8ddfdae10663624ff0a15ab165952708.tar.xz
linux-47291baa8ddfdae10663624ff0a15ab165952708.zip
namei: make permission helpers idmapped mount aware
The two helpers inode_permission() and generic_permission() are used by the vfs to perform basic permission checking by verifying that the caller is privileged over an inode. In order to handle idmapped mounts we extend the two helpers with an additional user namespace argument. On idmapped mounts the two helpers will make sure to map the inode according to the mount's user namespace and then peform identical permission checks to inode_permission() and generic_permission(). 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/20210121131959.646623-6-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> Acked-by: Serge Hallyn <serge@hallyn.com> Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Diffstat (limited to 'fs/overlayfs/util.c')
-rw-r--r--fs/overlayfs/util.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/overlayfs/util.c b/fs/overlayfs/util.c
index 6569031af3cd..de5c2047a0e9 100644
--- a/fs/overlayfs/util.c
+++ b/fs/overlayfs/util.c
@@ -479,7 +479,7 @@ struct file *ovl_path_open(struct path *path, int flags)
BUG();
}
- err = inode_permission(inode, acc_mode | MAY_OPEN);
+ err = inode_permission(&init_user_ns, inode, acc_mode | MAY_OPEN);
if (err)
return ERR_PTR(err);