On Thu, 2016-06-30 at 15:47 +0200, Andreas Gruenbacher wrote:
> Add richacl xattr handler implementing the xattr operations based on the
> get_richacl and set_richacl inode operations.
>
> Signed-off-by: Andreas Gruenbacher <agruenba@xxxxxxxxxx>
> ---
> fs/richacl.c | 22 ++++++++++++++++
> fs/richacl_xattr.c | 61 +++++++++++++++++++++++++++++++++++++++++++
> include/linux/richacl.h | 1 +
> include/linux/richacl_xattr.h | 2 ++
> 4 files changed, 86 insertions(+)
>
> diff --git a/fs/richacl.c b/fs/richacl.c
> index 40e4af9..b7d7104 100644
> --- a/fs/richacl.c
> +++ b/fs/richacl.c
> @@ -549,6 +549,28 @@ out:
> EXPORT_SYMBOL_GPL(richacl_permission);
>
> /**
> + * set_richacl - set the richacl of an inode
> + * @inode: inode whose richacl to set
> + * @acl: access control list
> + */
> +int
> +set_richacl(struct inode *inode, struct richacl *acl)
> +{
> + if (!IS_RICHACL(inode))
> + return -EOPNOTSUPP;
> + if (!inode->i_op->set_richacl)
> + return -EOPNOTSUPP;
> +
> + if (!uid_eq(current_fsuid(), inode->i_uid) &&
> + inode_permission(inode, MAY_CHMOD) &&
> + !capable(CAP_FOWNER))
> + return -EPERM;
> +
> + return inode->i_op->set_richacl(inode, acl);
> +}
> +EXPORT_SYMBOL(set_richacl);
> +
> +/**
> * __richacl_chmod - update the file masks to reflect the new mode
> * @acl: access control list
> * @mode: new file permission bits including the file type
> diff --git a/fs/richacl_xattr.c b/fs/richacl_xattr.c
> index dc1ad36..5eb4aba 100644
> --- a/fs/richacl_xattr.c
> +++ b/fs/richacl_xattr.c
> @@ -18,7 +18,9 @@
> #include
> #include
> #include
> +#include
> #include
> +#include
>
> /**
> * richacl_from_xattr - convert a richacl xattr into the in-memory representation
> @@ -159,3 +161,62 @@ richacl_to_xattr(struct user_namespace *user_ns,
> return real_size;
> }
> EXPORT_SYMBOL_GPL(richacl_to_xattr);
> +
> +static bool
> +richacl_xattr_list(struct dentry *dentry)
> +{
> + return IS_RICHACL(d_backing_inode(dentry));
> +}
> +
> +static int
> +richacl_xattr_get(const struct xattr_handler *handler,
> + struct dentry *unused, struct inode *inode,
> + const char *name, void *buffer, size_t buffer_size)
> +{
> + struct richacl *acl;
> + int error;
> +
> + if (*name)
> + return -EINVAL;
> + if (!IS_RICHACL(inode))
> + return -EOPNOTSUPP;
> + if (S_ISLNK(inode->i_mode))
> + return -EOPNOTSUPP;
> + acl = get_richacl(inode);
> + if (IS_ERR(acl))
> + return PTR_ERR(acl);
> + if (acl == NULL)
> + return -ENODATA;
> + error = richacl_to_xattr(current_user_ns(), acl, buffer, buffer_size);
> + richacl_put(acl);
> + return error;
> +}
> +
> +static int
> +richacl_xattr_set(const struct xattr_handler *handler,
> + struct dentry *unused, struct inode *inode,
> + const char *name, const void *value, size_t size,
> + int flags)
> +{
> + struct richacl *acl = NULL;
> + int ret;
> +
> + if (value) {
> + acl = richacl_from_xattr(current_user_ns(), value, size,
> + -EINVAL);
> + if (IS_ERR(acl))
> + return PTR_ERR(acl);
> + }
> +
> + ret = set_richacl(inode, acl);
> + richacl_put(acl);
> + return ret;
> +}
> +
> +struct xattr_handler richacl_xattr_handler = {
> + .name = XATTR_NAME_RICHACL,
> + .list = richacl_xattr_list,
> + .get = richacl_xattr_get,
> + .set = richacl_xattr_set,
> +};
> +EXPORT_SYMBOL(richacl_xattr_handler);
> diff --git a/include/linux/richacl.h b/include/linux/richacl.h
> index a442372..e7db066 100644
> --- a/include/linux/richacl.h
> +++ b/include/linux/richacl.h
> @@ -206,5 +206,6 @@ extern int richacl_chmod(struct inode *, umode_t);
> extern int richacl_equiv_mode(const struct richacl *, umode_t *);
> extern struct richacl *richacl_inherit(const struct richacl *, int);
> extern struct richacl *richacl_create(umode_t *, struct inode *);
> +extern int set_richacl(struct inode *, struct richacl *);
>
> #endif /* __RICHACL_H */
> diff --git a/include/linux/richacl_xattr.h b/include/linux/richacl_xattr.h
> index 0efa14b..6c6adb1 100644
> --- a/include/linux/richacl_xattr.h
> +++ b/include/linux/richacl_xattr.h
> @@ -26,4 +26,6 @@ extern size_t richacl_xattr_size(const struct richacl *);
> extern int richacl_to_xattr(struct user_namespace *, const struct richacl *,
> void *, size_t);
>
> +extern struct xattr_handler richacl_xattr_handler;
> +
> #endif /* __RICHACL_XATTR_H */
Cue same refrain about syscalls vs. xattrs. Otherwise:
Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx>
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