@@ -44,6 +44,35 @@ static bool ovl_must_copy_xattr(const char *name)
!strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN);
}
+static int ovl_copy_acl(struct ovl_fs *ofs, const struct path *path,
+ struct dentry *dentry, const char *acl_name)
+{
+ int err;
+ struct posix_acl *clone, *real_acl = NULL;
+
+ real_acl = ovl_get_acl_path(path, acl_name);
+ if (!real_acl)
+ return 0;
+
+ if (IS_ERR(real_acl)) {
+ err = PTR_ERR(real_acl);
+ if (err == -ENODATA || err == -EOPNOTSUPP)
+ return 0;
+ return err;
+ }
+
+ clone = posix_acl_clone(real_acl, GFP_KERNEL);
+ posix_acl_release(real_acl); /* release original acl */
+ if (!clone)
+ return -ENOMEM;
+
+ err = ovl_do_set_acl(ofs, dentry, acl_name, clone);
+
+ /* release cloned acl */
+ posix_acl_release(clone);
+ return err;
+}
+
int ovl_copy_xattr(struct super_block *sb, struct path *oldpath, struct dentry *new)
{
struct dentry *old = oldpath->dentry;
@@ -93,6 +122,15 @@ int ovl_copy_xattr(struct super_block *sb, struct path *oldpath, struct dentry *
error = 0;
continue; /* Discard */
}
+
+ if (is_posix_acl_xattr(name)) {
+ error = ovl_copy_acl(OVL_FS(sb), oldpath, new, name);
+ if (!error)
+ continue;
+ /* POSIX ACLs must be copied. */
+ break;
+ }
+
retry:
size = ovl_do_getxattr(oldpath, name, value, value_size);
if (size == -ERANGE)
@@ -435,28 +435,12 @@ static struct dentry *ovl_clear_empty(struct dentry *dentry,
}
static int ovl_set_upper_acl(struct ovl_fs *ofs, struct dentry *upperdentry,
- const char *name, const struct posix_acl *acl)
+ const char *acl_name, struct posix_acl *acl)
{
- void *buffer;
- size_t size;
- int err;
-
if (!IS_ENABLED(CONFIG_FS_POSIX_ACL) || !acl)
return 0;
- size = posix_acl_xattr_size(acl->a_count);
- buffer = kmalloc(size, GFP_KERNEL);
- if (!buffer)
- return -ENOMEM;
-
- err = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
- if (err < 0)
- goto out_free;
-
- err = ovl_do_setxattr(ofs, upperdentry, name, buffer, size, XATTR_CREATE);
-out_free:
- kfree(buffer);
- return err;
+ return ovl_do_set_acl(ofs, upperdentry, acl_name, acl);
}
static int ovl_create_over_whiteout(struct dentry *dentry, struct inode *inode,
@@ -550,8 +550,8 @@ struct posix_acl *ovl_get_inode_acl(struct inode *inode, int type, bool rcu)
return clone;
}
-static struct posix_acl *ovl_get_acl_path(const struct path *path,
- const char *acl_name)
+struct posix_acl *ovl_get_acl_path(const struct path *path,
+ const char *acl_name)
{
struct posix_acl *real_acl, *clone;
struct user_namespace *mnt_userns;
@@ -614,10 +614,17 @@ int ovl_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry,
void ovl_idmap_posix_acl(struct inode *realinode,
struct user_namespace *mnt_userns,
struct posix_acl *acl);
+struct posix_acl *ovl_get_acl_path(const struct path *path,
+ const char *acl_name);
#else
#define ovl_get_inode_acl NULL
#define ovl_get_acl NULL
#define ovl_set_acl NULL
+static inline struct posix_acl *ovl_get_acl_path(const struct path *path,
+ const char *acl_name)
+{
+ return NULL;
+}
#endif
int ovl_update_time(struct inode *inode, struct timespec64 *ts, int flags);
@@ -812,13 +812,11 @@ static struct dentry *ovl_workdir_create(struct ovl_fs *ofs,
* allowed as upper are limited to "normal" ones, where checking
* for the above two errors is sufficient.
*/
- err = ovl_do_removexattr(ofs, work,
- XATTR_NAME_POSIX_ACL_DEFAULT);
+ err = ovl_do_remove_acl(ofs, work, XATTR_NAME_POSIX_ACL_DEFAULT);
if (err && err != -ENODATA && err != -EOPNOTSUPP)
goto out_dput;
- err = ovl_do_removexattr(ofs, work,
- XATTR_NAME_POSIX_ACL_ACCESS);
+ err = ovl_do_remove_acl(ofs, work, XATTR_NAME_POSIX_ACL_ACCESS);
if (err && err != -ENODATA && err != -EOPNOTSUPP)
goto out_dput;
@@ -281,12 +281,6 @@ __vfs_setxattr_locked(struct user_namespace *mnt_userns, struct dentry *dentry,
}
EXPORT_SYMBOL_GPL(__vfs_setxattr_locked);
-static inline bool is_posix_acl_xattr(const char *name)
-{
- return (strcmp(name, XATTR_NAME_POSIX_ACL_ACCESS) == 0) ||
- (strcmp(name, XATTR_NAME_POSIX_ACL_DEFAULT) == 0);
-}
-
int
vfs_setxattr(struct user_namespace *mnt_userns, struct dentry *dentry,
const char *name, const void *value, size_t size, int flags)
@@ -22,6 +22,12 @@
struct inode;
struct dentry;
+static inline bool is_posix_acl_xattr(const char *name)
+{
+ return (strcmp(name, XATTR_NAME_POSIX_ACL_ACCESS) == 0) ||
+ (strcmp(name, XATTR_NAME_POSIX_ACL_DEFAULT) == 0);
+}
+
/*
* struct xattr_handler: When @name is set, match attributes with exactly that
* name. When @prefix is set instead, match attributes with that prefix and
Now that posix acls have a proper api us it to copy them. All filesystems that can serve as lower or upper layers for overlayfs have gained support for the new posix acl api in previous patches. So switch all internal overlayfs codepaths for copying posix acls to the new posix acl api. Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org> --- Notes: /* v2 */ Miklos Szeredi <miklos@szeredi.hu>: - Move ovl_copy_acl() from util.c to copy_up.c - Unconditionally clone posix acls fs/overlayfs/copy_up.c | 38 ++++++++++++++++++++++++++++++++++++++ fs/overlayfs/dir.c | 20 ++------------------ fs/overlayfs/inode.c | 4 ++-- fs/overlayfs/overlayfs.h | 7 +++++++ fs/overlayfs/super.c | 6 ++---- fs/xattr.c | 6 ------ include/linux/xattr.h | 6 ++++++ 7 files changed, 57 insertions(+), 30 deletions(-)