linux-kernel - Re: linux-next: build failure after merge of the kspp tree

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Date:   Mon, 19 Jun 2017 22:39:36 -0700
From:   Kees Cook <keescook@...gle.com>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     James Morris <jmorris@...ei.org>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        John Johansen <john.johansen@...onical.com>
Subject: Re: linux-next: build failure after merge of the kspp tree

On Mon, Jun 19, 2017 at 9:56 PM, Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> Hi all,
>
> After merging the kspp tree, today's linux-next build (x86_64
> allmodconfig) failed like this:
>
> security/apparmor/file.c: In function 'aa_path_link':
> security/apparmor/file.c:475:23: error: positional initialization of field in 'struct' declared with 'designated_init' attribute [-Werror=designated-init]
>   struct path link = { new_dir->mnt, new_dentry };
>                        ^
> security/apparmor/file.c:475:23: note: (near initialization for 'link')
> security/apparmor/file.c:475:37: error: positional initialization of field in 'struct' declared with 'designated_init' attribute [-Werror=designated-init]
>   struct path link = { new_dir->mnt, new_dentry };
>                                      ^
> security/apparmor/file.c:475:37: note: (near initialization for 'link')
> security/apparmor/file.c:476:25: error: positional initialization of field in 'struct' declared with 'designated_init' attribute [-Werror=designated-init]
>   struct path target = { new_dir->mnt, old_dentry };
>                          ^
> security/apparmor/file.c:476:25: note: (near initialization for 'target')
> security/apparmor/file.c:476:39: error: positional initialization of field in 'struct' declared with 'designated_init' attribute [-Werror=designated-init]
>   struct path target = { new_dir->mnt, old_dentry };
>                                        ^
> security/apparmor/file.c:476:39: note: (near initialization for 'target')
>
> Caused by commit
>
>   1a12979f61e4 ("randstruct: Mark various structs for randomization")
>
> interacting with commit
>
>   8014370f1257 ("apparmor: move path_link mediation to using labels")
>
> from the security tree.
>
> I added the following merge fix patch for today:
>
> From: Stephen Rothwell <sfr@...b.auug.org.au>
> Date: Tue, 20 Jun 2017 14:50:36 +1000
> Subject: [PATCH] apparmor: put back designators in struct initialisers
>
> Fixes: 8014370f1257 ("apparmor: move path_link mediation to using labels")
> Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
> ---
>  security/apparmor/file.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/security/apparmor/file.c b/security/apparmor/file.c
> index b6e8e5b11e05..3382518b87fa 100644
> --- a/security/apparmor/file.c
> +++ b/security/apparmor/file.c
> @@ -472,8 +472,8 @@ static int profile_path_link(struct aa_profile *profile,
>  int aa_path_link(struct aa_label *label, struct dentry *old_dentry,
>                  const struct path *new_dir, struct dentry *new_dentry)
>  {
> -       struct path link = { new_dir->mnt, new_dentry };
> -       struct path target = { new_dir->mnt, old_dentry };
> +       struct path link = { .mnt = new_dir->mnt, .dentry = new_dentry };
> +       struct path target = { .mnt = new_dir->mnt, .dentry = old_dentry };
>         struct path_cond cond = {
>                 d_backing_inode(old_dentry)->i_uid,
>                 d_backing_inode(old_dentry)->i_mode
> --
> 2.11.0

Thanks for the fix! That looks correct to me. It seems the refactoring
in 8014370f1257 ("apparmor: move path_link mediation to using labels")
didn't take 8486adf0d755 ("apparmor: use designated initializers")
into account. John, if this looks okay, can you Ack it for James to
carry in security-next?

-Kees

-- 
Kees Cook
Pixel Security