Re: [PATCH 0/4 v5] devpts: handle bind-mounts correctly

From: Christian Brauner
Date: Tue Mar 13 2018 - 12:51:56 EST


On Tue, Mar 13, 2018 at 11:41:00AM -0500, Eric W. Biederman wrote:
> Christian Brauner <christian.brauner@xxxxxxxxxx> writes:
>
> > Hey everyone,
> >
> > This is the fith iteration of this patch. Per-patch changes are
> > summarized in the individual patches:
>
> Acked-by: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
>
> I guess we need to answer the question do I pick up this series or does
> gregkh. This series would seem to fit in his tty tree.
>
> You haven't copied gregkh so you may need to resend and do that.

I'll resend and CC grekh now.

Christian

>
> Eric
>
>
> > ChangeLog v4->v5:
> > * added non-functional patch to document devpts_mntget().
> > Reason for putting this in a separate patch is that it allows you,
> > Linus and Eric, to simply drop it if judged useless.
> > * reverse error handling logic to further simplify
> > * dput() dentry in the non-function patch. This was not really a problem
> > since the following patch included a fix for it. But better to get it
> > right in all individual patches.
> > * I did another rewrite of the problem analysis for
> > posterity in the patch "Subject: [PATCH 2/3 v3] devpts: resolve devpts
> > bind-mounts" and in this cover letter.
> >
> > ChangeLog v3->v4:
> > * small logical simplifications
> > * add test that bind-mounts of /dev/pts/ptmx to locations that do not
> > resolve to a valid slave pty path under the originating devpts mount
> > fail
> >
> > ChangeLog v2->v3:
> > * rewritten commit message to thoroughly analyse the problem for
> > posterity in the patch "Subject: [PATCH 2/3 v3] devpts: resolve devpts
> > bind-mounts" and in this cover letter.
> > * extended selftests to test for correct handling of /dev/pts/ptmx
> > bind-mounts to /dev/ptmx and non-standard devpts mounts such as
> > mount -t devpts devpts /mnt
> >
> > ChangeLog v1->v2:
> > * see individual patches
> > ChangeLog v0->v1:
> > * see individual patches
> >
> > Christian Brauner (4):
> > devpts: hoist out check for DEVPTS_SUPER_MAGIC
> > devpts: resolve devpts bind-mounts
> > devpts: comment devpts_mntget()
> > selftests: add devpts selftests
> >
> > fs/devpts/inode.c | 66 +++--
> > tools/testing/selftests/Makefile | 1 +
> > tools/testing/selftests/filesystems/.gitignore | 1 +
> > tools/testing/selftests/filesystems/Makefile | 2 +-
> > tools/testing/selftests/filesystems/devpts_pts.c | 313 +++++++++++++++++++++++
> > 5 files changed, 363 insertions(+), 20 deletions(-)
> > create mode 100644 tools/testing/selftests/filesystems/devpts_pts.c
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