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author | Christian Brauner <christian.brauner@ubuntu.com> | 2021-01-21 14:19:25 +0100 |
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committer | Christian Brauner <christian.brauner@ubuntu.com> | 2021-01-24 14:27:16 +0100 |
commit | 21cb47be6fb9ece7e6ee63f6780986faa384a77c (patch) | |
tree | 986aa824a8b3aa45487b26364dbde88dbc853ff4 /fs/ubifs | |
parent | 47291baa8ddfdae10663624ff0a15ab165952708 (diff) | |
download | linux-21cb47be6fb9ece7e6ee63f6780986faa384a77c.tar.gz |
inode: make init and permission helpers idmapped mount aware
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>
Diffstat (limited to 'fs/ubifs')
-rw-r--r-- | fs/ubifs/dir.c | 2 | ||||
-rw-r--r-- | fs/ubifs/ioctl.c | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c index 9a6b8660425a..694e7714545b 100644 --- a/fs/ubifs/dir.c +++ b/fs/ubifs/dir.c @@ -94,7 +94,7 @@ struct inode *ubifs_new_inode(struct ubifs_info *c, struct inode *dir, */ inode->i_flags |= S_NOCMTIME; - inode_init_owner(inode, dir, mode); + inode_init_owner(&init_user_ns, inode, dir, mode); inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode); inode->i_mapping->nrpages = 0; diff --git a/fs/ubifs/ioctl.c b/fs/ubifs/ioctl.c index 4363d85a3fd4..2326d5122beb 100644 --- a/fs/ubifs/ioctl.c +++ b/fs/ubifs/ioctl.c @@ -155,7 +155,7 @@ long ubifs_ioctl(struct file *file, unsigned int cmd, unsigned long arg) if (IS_RDONLY(inode)) return -EROFS; - if (!inode_owner_or_capable(inode)) + if (!inode_owner_or_capable(&init_user_ns, inode)) return -EACCES; if (get_user(flags, (int __user *) arg)) |