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overlayfs fixes for 5.19-rc7

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Merge tag 'ovl-fixes-5.19-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs

Pull overlayfs fix from Miklos Szeredi:
 "Add a temporary fix for posix acls on idmapped mounts introduced in
  this cycle. A proper fix will be added in the next cycle"

* tag 'ovl-fixes-5.19-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs:
  ovl: turn off SB_POSIXACL with idmapped layers temporarily
This commit is contained in:
Linus Torvalds 2022-07-12 08:59:35 -07:00
commit 72a8e05d4f
2 changed files with 28 additions and 1 deletions
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4
Documentation/filesystems/overlayfs.rst
View File

@ -466,6 +466,10 @@ overlay filesystem and the value of st_ino for filesystem objects may not be
persistent and could change even while the overlay filesystem is mounted, as
summarized in the `Inode properties`_ table above.
4) "idmapped mounts"
When the upper or lower layers are idmapped mounts overlayfs will be mounted
without support for POSIX Access Control Lists (ACLs). This limitation will
eventually be lifted.
Changes to underlying filesystems
---------------------------------

25
fs/overlayfs/super.c
View File

@ -1003,6 +1003,9 @@ ovl_posix_acl_xattr_get(const struct xattr_handler *handler,
struct dentry *dentry, struct inode *inode,
const char *name, void *buffer, size_t size)
{
if (!IS_POSIXACL(inode))
return -EOPNOTSUPP;
return ovl_xattr_get(dentry, inode, handler->name, buffer, size);
}
@ -1018,6 +1021,9 @@ ovl_posix_acl_xattr_set(const struct xattr_handler *handler,
struct posix_acl *acl = NULL;
int err;
if (!IS_POSIXACL(inode))
return -EOPNOTSUPP;
/* Check that everything is OK before copy-up */
if (value) {
acl = posix_acl_from_xattr(&init_user_ns, value, size);
@ -1960,6 +1966,20 @@ static struct dentry *ovl_get_root(struct super_block *sb,
return root;
}
static bool ovl_has_idmapped_layers(struct ovl_fs *ofs)
{
unsigned int i;
const struct vfsmount *mnt;
for (i = 0; i < ofs->numlayer; i++) {
mnt = ofs->layers[i].mnt;
if (mnt && is_idmapped_mnt(mnt))
return true;
}
return false;
}
static int ovl_fill_super(struct super_block *sb, void *data, int silent)
{
struct path upperpath = { };
@ -2129,7 +2149,10 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
sb->s_xattr = ofs->config.userxattr ? ovl_user_xattr_handlers :
ovl_trusted_xattr_handlers;
sb->s_fs_info = ofs;
sb->s_flags |= SB_POSIXACL;
if (ovl_has_idmapped_layers(ofs))
pr_warn("POSIX ACLs are not yet supported with idmapped layers, mounting without ACL support.\n");
else
sb->s_flags |= SB_POSIXACL;
sb->s_iflags |= SB_I_SKIP_SYNC;
err = -ENOMEM;