@@ -17,6 +17,8 @@
#include <linux/security.h>
#include <linux/evm.h>
#include <linux/ima.h>
+#include <linux/fsuidgid.h>
+#include <linux/fs.h>
static bool chown_ok(const struct inode *inode, kuid_t uid)
{
@@ -311,12 +313,21 @@ int notify_change(struct dentry * dentry, struct iattr * attr, struct inode **de
* Verify that uid/gid changes are valid in the target
* namespace of the superblock.
*/
- if (ia_valid & ATTR_UID &&
- !kuid_has_mapping(inode->i_sb->s_user_ns, attr->ia_uid))
- return -EOVERFLOW;
- if (ia_valid & ATTR_GID &&
- !kgid_has_mapping(inode->i_sb->s_user_ns, attr->ia_gid))
- return -EOVERFLOW;
+ if (is_userns_visible(inode->i_sb->s_iflags)) {
+ if (ia_valid & ATTR_UID &&
+ !kuid_has_mapping(inode->i_sb->s_user_ns, attr->ia_uid))
+ return -EOVERFLOW;
+ if (ia_valid & ATTR_GID &&
+ !kgid_has_mapping(inode->i_sb->s_user_ns, attr->ia_gid))
+ return -EOVERFLOW;
+ } else {
+ if (ia_valid & ATTR_UID &&
+ !kfsuid_has_mapping(inode->i_sb->s_user_ns, attr->ia_uid))
+ return -EOVERFLOW;
+ if (ia_valid & ATTR_GID &&
+ !kfsgid_has_mapping(inode->i_sb->s_user_ns, attr->ia_gid))
+ return -EOVERFLOW;
+ }
/* Don't allow modifications of files with invalid uids or
* gids unless those uids & gids are being made valid.
Switch notify_change() to lookup fsids in the fsid mappings. If no fsid mappings are setup the behavior is unchanged, i.e. fsids are looked up in the id mappings. Filesystems that share a superblock in all user namespaces they are mounted in will retain their old semantics even with the introduction of fsidmappings. Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com> --- fs/attr.c | 23 +++++++++++++++++------ 1 file changed, 17 insertions(+), 6 deletions(-)